115 results about "Projectile motion" patented technology

The invention relates to a method for controlling and compensating an ink dropping point in an inkjet printer. The method at least comprises: a step 101, in which according to the moving speed of a word car, the jetting speed of a nozzle in the self-motion of ink drops and the distance between the nozzle and a printing medium, a graph 2 is referred and Newton's laws of kinematics is used as basis to list an equation set of horizontal projectile motion; the time ts needed for early injection is calculated; a step 102, in which according to ts, sampling time T of Kalman filtering wave is determined; according to the moving speed of a uniform speed section of the word car and the ts in the step 101, a speed curve of the word car is divided so that the sampling time of the Kalman filtering wave is more than the time of early injection; a step 103, in which according to the determined initial value of the Kalman filtering wave and the observed displacement value of the word car, one-step prediction is carried out to obtain the state variable of next time; and a step 104, in which the predicted speed value in the step 103 is utilized to carry out calculation of relevant controlled quantity; and the step returned to the step 103 for iterative prediction. The method can compensate for errors of the ink dropping point, has good precision of prediction, broadens the printing area and improves printing efficiency.

The invention discloses a wind-driven automatic feeding system and an evenly feeding method. An automatic feeding device, a communication device, a central control device and a Beidou navigation device are arranged on an air propeller wind-driven boat. The central control device is respectively connected with the communication device and the Beidou navigation device through signal lines. A communication base station is arranged on the bank and is in communication with the communication device and a monitoring server arranged in a system monitoring room. The steps of modeling of a projectile device of a feeding machine, modeling of oblique projectile motion of feed particles, modeling of accumulation density distribution of feed on the water, solving of the optimal running parameters of even feeding of the automatic feeding system and the like are executed to automatically determine the feeding amount of a feeding unit of the automatic feeding device in unit time, the speed of rotation of a projectile disk, the projectile fan angle of the feeding machine, the driving speed of the wind-driven boat, the width of two adjacent feeding travels in a path plan and other optimal running parameters of the automatic feeding system. By means of a Beidou satellite navigation system, the path is tracked through the Beidou navigation device, and thus automatic and even feeding operation can be completed.

The invention particularly relates to a physical teaching aid capable of achieving crossed teaching demonstration and a teaching method. The physical teaching aid organically combines horizontal projectile motion, force balance, and circuits in physics. A rotating motor drives a wire winding rod to rotate. The wire winding rod tightens or loosens a pull rope in order to drive a first track to rotate around a second track. The falling gradient of balls is changed in order to change the initial speed of the horizontal projectile motion and a horizontal projectile trajectory. A demonstration board enhances the display of the horizontal projectile trajectory of the balls. A baffle blocks the balls and the balls fall on a rollback slideway and roll to the left end of the rollback slideway so asto further drive a balance demonstration component to operate. The balls continuously enter the right leg of a piston cylinder to move downward the piston plate of the right leg. Due to force balance, the liquid in the piston cylinder moves and the piston plate of the right leg moves upward so as to realize the visual display of the force balance. The piston plate of the right leg gradually movesup under the influence of the force balance, a lower metal block contacts an upper metal block, and a contact switch is closed so that an indicator light is turned on to achieve the visual display ofthe circuit.

The invention discloses a random finite element analysis based infrared-decoy-projectile pneumatic feature modeling method. The pneumatic feature modeling method includes the steps of analysis and simplification of infrared-decoy-projectile working field, finite element subdivision of the decoy projectile working field, determination of unit interpolation based function, analysis of finite units, establishment of overall-random finite element equation, establishment and simulation of decoy projectile motion equation and the like. A temperature flow field distribution and random air-resistance movement feature model of a decoy projectile is provided on the basis of a finite analysis method by analyzing working mechanism and operating status of the decoy projectile; basis is provided for design of the infrared decoy projectile and research on an infrared guidance algorithm, and important guiding significance is achieved for establishment of an infrared visual simulation system.

The invention relates to an intelligent irrigation unmanned aerial vehicle for agricultural production. The intelligent irrigation unmanned aerial vehicle comprises a main body, a flight mechanism disposed on both sides of the main body, a water fetching mechanism disposed on the main body, an irrigation mechanism disposed on the water fetching mechanism, a supporting plate and two vertically disposed struts. The intelligent irrigation unmanned aerial vehicle for the agricultural production is characterized in that a third capacitor in a working power source circuit is used for noise reduction, and an integrated circuit is used for real-time voltage adjustment, so that stability of an output voltage is increased. The integrated circuit has a thermal circuit breaking function and an output current limiting function, so that an external protection circuit does not need to be disposed, the production cost for a working power source module is reduced, and market competitiveness of the unmanned aerial vehicle is enhanced. In addition, height changing of a frame body is driven by rotation of a second drive motor in a lifting unit in the irrigation mechanism, so that the height of a spray nozzle can be changed in real time; a landing point of horizontal projectile motion conducted by water flows after the water flows pass the spray head can be changed; a specific landing scope is formed; and thus an irrigation scope is expanded.

The invention provides an electromagnetic positioning device, which comprises an induction positioning plate. The outer boundary of a side of the induction positioning plate is equipped with a fixing plate. A support base is mounted on the fixed plate on the front of the induction positioning plate. The lower portion of the support base is equipped with a track on which a projectile is disposed. A slide rod is mounted on the support base. A first spring is mounted on the slide rod. One end of the slide rod in the length direction is located at one side of the projectile, while the other end of the slide rod is located at the outer side of the fixing plate. The back of the induction positioning plate is provided with horizontally and vertically arranged coil array circuits. A USB interface is disposed in the induction positioning plate and is connected with a computer through a line. The projectile has an upper shell and a lower shell, and forms a cavity once being closed. A battery is mounted in the cavity and is connected with a circuit board via a wire. The circuit board is connected with a magnetic core coil via the wire. The invention can display the horizontal projectile motion as the resultant motion of the uniform linear motion in a horizontal direction and the free-fall motion in a vertical direction via the computer, and has the advantages of easy operation, low maintenance rate and long service life.

The invention herein provides for an improved fill composition for encapsulation in casing structures adapted for projectile motion and rupture upon contact with a target surface, such as paintballs. The fill composition adapted for use in an impact-rupturable capsule of the invention comprises a water soluble dye and soy oil. The invention further provides for an improved shell composition for an impact-rupturable capsule containing the fill composition.

The invention relates to a predicting, optimizing and controlling method for a maximum power point of a photovoltaic array under a partially shaded condition. The predicting, optimizing and controlling method for the maximum power point of the photovoltaic array under the partially shaded condition comprises the following steps: S1, constructing a photovoltaic array kinematics projectile motion model by combining a current-voltage characteristic curve of a photovoltaic array to similarity of a mass point projectile motion trail; S2, solving the photovoltaic array kinematics projectile motion model by using an improved particle swarm algorithm, and acquiring the maximum power point, voltage at the position of the maximum power point and a voltage range in which the maximum power point is located; S3, optimizing the maximum power point by using a voltage closed-loop control method or an exponential variable-step-size conductance increment method to obtain control signals; and S4, controlling switch-on and switch-off of a Boost circuit by the acquired control signals, and controlling the maximum output power of the photovoltaic array in real time. Compared with the prior art, the predicting, optimizing and controlling method for the maximum power point of the photovoltaic array under the partially shaded condition has the advantages that maximum power point global optimization isimplemented, and the efficiency of a photovoltaic power generation system is improved.

A kind of space motion vehicle includes sphere transparent crust1 to be the car body. Outside the crust1 is the outer steel ring2 and inner steel ring3. Wherein, the tyre4 is fixed in the outer steel ring2, and the driven vehicle5 in the crust1 contains carframe6. Vehicle wheel7 and 8, rolling in the beard of the inner steel ring3, and making the driven vehicle only ride on the forming track in the beard, are fixed separately on the top and the bottom of the carframe6. In the under part of the carframe6 is the heavy-body9 and the undercarriage10. And the seat11 that contains safety belt, the car handle12 as well as the driving mechanism and control mechanism that actuate the bottom cartwheel8 are fixed on the undercarriage10. Besides, the car door13 is fixed in the crust1. The invention can roll forward smoothly, tumble freely and be pelagic on water. It is a sport equipment for those who loves venturesome and stimulant sports, can be used not only in tumble motion, empty projectile motion, on water drift motion and duel meet motion, but also in pilots' exercising apparatus, industrial robot and military use.

The invention relates to the field of physics teaching, in particular to a physical projectile experiment demonstration device. The physical projectile experiment demonstration device comprises a base, a glass supporting plate and a vertical support, wherein the glass supporting plate is vertically fixed on the base and is transparent; the vertical support is fixed on the base, is positioned on the left side of the glass supporting plate and is used for enabling a fixed sliding track to slide; a first electromagnet is fixed at the top end of the sliding track; an infrared photoelectric sensor and a speed sensor are arranged at the tail end of the sliding track; a chute is formed in the base; infrared photoelectric sensors are uniformly arranged in the chute; a stroboscopic camera is arranged at the rear of the glass supporting plate; a second electromagnet with an infrared photoelectric sensor fixed at the bottom is slidably fixed on the glass supporting plate; a display screen is fixed on the right side of the glass supporting plate; a central processing unit is arranged in the base, and is electrically connected with the infrared photoelectric sensors, the speed sensor, the stroboscopic camera, the display screen and a clock circuit respectively; and the display screen displays movement tracks during horizontal projectile motion and free dropping and other data so as to facilitate observation and calculation; and good learning effect is achieved.

The invention belongs to the teaching aid technology field, and relates to an automatic horizontal projectile motion demonstration device. The automatic horizontal projectile motion demonstration device comprises a frame; a lifting device, a horizontal projectile track, and a bead recovery skewed slot, which are fixedly disposed on the frame. The horizontal projectile track is used to provide initial velocities of beads carrying out the horizontal projectile motion, and the bead recovery skewed slot is used to collect the beads finishing the horizontal projectile motion. The lifting device is used to lift the beads in the bead recovery skewed slot to the horizontal projectile track, and then the beads can be used to complete the horizontal projectile process again. The beads thrown by the horizontal projectile track are collected by the bead recovery skewed slot, and are lifted to the horizontal projectile track by the lifting device, and the above mentioned process can be repeated continuously, and therefore hands of experimenters are liberated, and by adopting an automatic structural design, the experiments can be carried out by throwing the beads automatically for a plurality of times. The experiments are visual and continuous, and impressions of students are deepened.

Water flow is adopted in the invention as moving body. Demo instrument of projectile motion is composed of bracket, water tank, switch, outlet pipe, spray nozzle, angle adjuster, faceplate, trough for receiving water, levelmeter, motherboard, level regulation screw for motherboard, and drainpipe. The invention demonstrates regular pattern of flat throwing and inclined throwing. Comparing with former instrument by shooting off small balls, the invention possesses features of simple structure, easy of operation and high visibility.

The invention discloses a hydraulic jump type porous artificial floating island. The hydraulic jump type porous artificial floating island is characterized in that an axial flow type undercurrent pumpis used for continuously absorbing water in swallow; water in swallow is absorbed into the undercurrent pump and then is conveyed to a nozzle of a spraying device through a water conveying pipe; thewater is sprayed through the nozzle and performs projectile motion and then falls to a floating bed to gain high oxygen content; and meanwhile, after the water is pumped away, high oxygen content shallow water falls under the effect of gravity to supplement the swallow; the operation is repeated to finish the oxygen supplying circulation of the whole water; a solar cell panel is obliquely positioned around the periphery of the floating island, so that the solar energy can be utilized to the maximum to supply energy to the underwater axial flow type undercurrent pump. The hydraulic jump type porous artificial floating island achieves the purpose of rapidly processing the whole water within a short period in a three-dimensional manner; in addition, all materials are environmentally friendly,so that environmental pollution is avoided.

The invention discloses an experimental method for studying the motion of projectile with the application of digital technology, which comprises: adopt digital camera to take the image of small steel ball that is cast from an U-shape track that forms an inclination angle with level surface; an animation picture that flies over a face plate drawn with centimeter checks; save the animation picture taken by the digital camera in a computer; capture single stilled picture from the image via Premiere software; acquire the ball casting track chart from the captured single stilled image via Photoshop software; record the value of a X coordinate and a Y coordinate of small steel ball at corresponding time in the image; work out the horizontal motion speed, longitudinal motion speed and acceleration of the small steel ball with tabular difference method; calculate the formula for the horizontal and longitudinal motion of the small steel ball. Therefore, the invention, which applies digital technology for the study of projectile motion, is able to complete the making of projectile motion track chart within 3 lecture hours and record relevant experiment data.

The invention discloses a small ball motion simulating device, which comprises a bracket, wherein the bracket comprises a lower bottom plate, a left supporting arm and a right supporting arm, and a horizontal projectile motion structure, a free falling body motion structure and a vertical throw-up motion structure are arranged on the bracket; the horizontal projectile motion structure comprises afirst photoelectric gate and a sliding rail; the free falling body motion structure comprises an electromagnet and a convex brim; the electromagnet is fixedly mounted on the lower side surface of theconvex brim; the vertical throw-up motion structure comprises a ball receiving plate and a U-shaped rail which is arranged under the ball receiving plate and connects the upper and lower ends of the ball receiving plate; the rear side surface of the two supporting arms is provided with a magnetic drawing board provided with magnetic powder, and the small ball is an iron ball or a magnetic iron ball; and a flattening structure is arranged at the lower part of the bracket. The invention aims to solve the technical problem of providing the small ball motion simulating device, the small ball motion simulating device can simulate vertical motion situation of the small ball vividly, and the small ball motion simulating device is provided with the magnetic drawing board capable of displaying a motion trajectory, so that a teacher can mark and explain directly on the drawing board.

The invention provides a physical horizontal projection motion verification experimental device. The physical horizontal projection motion verification experimental device comprises an experimental box; a first horizontal plate is arranged on one side of the experimental box, and the first horizontal plate is embedded in one side of the experimental box; a movable plate is arranged on one side ofthe first horizontal plate; hinges are arranged between the first horizontal plate and the movable plates, and the first horizontal plate and the movable plate are connected through the hinges; and amicro switch is disposed in the movable plate. Horizontal and vertical motion of the horizontal projection motion can be simulated at different times, and the design can greatly reduce errors during the experiment, make an experimental phenomenon more intuitive and a teaching effect better, facilitates understanding of the student, the inclination degree of upper and lower inclined plates can be adjusted by rotating movable bolts to change the initial speed of the small iron ball during the horizontal projection motion to carry out many experiments; the contingency of the experiment can be avoided, and experimental errors can be reduced; and the physical horizontal projection motion verification experimental device is simple to operate, and is high in practicality.

The invention discloses a guidance method for detecting small-celestial-body-surface movement, and belongs to the field of space flight and aviation. The guidance method comprises the following steps that firstly initial velocity pulse is designed based on projectile motion to enable a detector to move towards a middle way point or a terminal target point in a bounce mode; and then a first-order sliding mode surface is designed to definite the target state of the detector. A second-order sliding mode surface is designed to track the first-order sliding mode surface, and an analytical expression of a guidance accelerated speed is deduced by using the second-order sliding mode surface; precise transferring of a single-time bounce of the detector is achieved by using the obtained guidance accelerated speed; and when a landing point is not the terminal target point, the precise transferring of the single-time bounce is repeated, and when the terminal target point is reached through the repeated precise transferring of the single-time bounce, the detector is precisely transferred to the terminal target point from a small celestial body surface. According to the guidance method for detecting small-celestial-body-surface movement, the control precision of the guidance method for detecting small-celestial-body-surface bounce and movement can be improved, and the robustness of the guidance method is improved.

The invention discloses a test bench capable of performing various physical experiments. The test bench comprises an operation panel. Support legs are arranged at four corners of the bottom of the operation panel. A first support bar is arranged at one side above the operation panel. A second support bar is arranged at the top of the first support bar. The top of the operation panel is provided with a storage tank. A movable plate is arranged in the storage tank. Through a mounting plate, a spring dynamometer and a second fixed pulley, a friction experiment is carried on the operation panel. Through the first support bar, the second support bar, a fixing rack and a ticker-tape timer, a freely falling motion test is carried out. Through an inclined plate, a horizontal plate and a stop block, a horizontal projectile motion experiment is carried out. Under the action of a rotation shaft, an electric lifting rod pushed a movable plate up so that the inclined angle between the movable plateand the horizontal direction is changed. Through a first fixed pulley, the Newton's second law experiment can be verified.

The invention provides a method for measuring motion parameters of projectile in a shooting range based on a digital slit shooting technology. The technical scheme comprises the following three steps of: first, arranging a stereo digital slit measuring system; second, determining a stereo linear array camera imaging model; and finally, measuring motion parameters of projectile. The second step comprises: 1, respectively determining inner orientation elements and exterior orientation elements of a front camera and a bottom camera; and 2, respectively determining imaging model expressions of the front camera and the bottom camera. The third step comprises: 1, selecting feature points and calculating initial estimated value of the motion parameters of projectile; and 2, constructing a motion parameter optimization solving model based on a projectile three-dimensional digital model and calculating the optimization estimated value of the projectile motion parameters. By the adoption of the measuring method provided by the invention, high-precision measuring of motion parameters of projectile in a shooting range such as target speed, attitude, angle of attack and the like is solved, and digitization and automation of the shooting range slit technology are realized.

The invention relates to an intelligent forecast-based maximum power point tracing method of a photovoltaic multi-peak value. The intelligent forecasting-based maximum power point tracing method comprises the following steps of S1, building a photovoltaic array kinematic horizontal-projectile model by combining similarity of a photovoltaic array current-voltage characteristic curve and mass pointhorizontal-projectile motion track; S2, solving the photovoltaic array kinematic horizontal-projectile model by employing an improved particle swarm optimization method to achieve maximum power forecast (intelligent forecast), and acquiring the maximum power point and a voltage of the maximum power point; S3, fitting the photovoltaic array current-voltage characteristic curve by the photovoltaic kinematic horizontal-projectile model, and locally tracing the maximum power point by employing a voltage closed-loop control method after forecast to acquire a control signal, wherein the fitting might not be accurate; and S4, controlling a Boost circuit to be connected and disconnected by employing the acquired control signal, and achieving real-time control of the photovoltaic array maximum output power. Compared with the prior art, the intelligent forecasting-based maximum power point tracing method has the advantages of global optimization of the maximum power point and the like, and the efficiency of a photovoltaic power generation system is improved.

The invention belongs to the technical field of object receiving, and provides a control method and a control system for automatically receiving an object. The control method comprises the following steps of: A, acquiring an object motion image in a preset area; B, obtaining motion track of the object according to position point changes of the object in the image; C, judging whether the object motion track is projectile motion track or not, and further calculating a pre-falling point position of the object and performing a step D if the object motion track is the projectile motion track, otherwise, returning to perform the step A; and D of controlling a receiving device to move to the pre-falling point position according to the pre-falling point position of the object for receiving the object. The control method is adopted to realize that a user does not to walk to a garbage can while throwing garbage; and while the user throws out the garbage, the garbage can automatically moves and receives garbage thrown by the user, so that the problem that a garbage can in the prior art cannot automatically receive garbage is solved.

The invention specifically relates to a physics teaching tool for the demonstration of horizontal projectile motion, and the teaching tool employs a screw assembly as a lifting assembly to drive a horizontal projectile assembly to move up and down, thereby achieving the adjustment of the initial height of the horizontal projectile motion of a small ball. An electric push rod is employed as a source of the power of the small ball for achieving the adjustment of the initial speed of the horizontal projectile motion of the small ball. The teaching tool is complete in demonstration effect of the horizontal projectile motion experiment, and guarantees the teaching quality. A pedestal is provided with a spring support-type separator plate. When the horizontal projectile assembly moves downwards,the separator plate is pressed into a slot, and the small ball blocked by the separator plate is released, and slides to a horizontal slideway; and then the lifting assembly lifts a lateral plate toa certain height again for next horizontal projectile motion, and the separator plate is stretched out again under the action of the spring, and continues to block the small ball. Moreover, the teaching tool is additionally provided with a simple harmonic swinging demonstration assembly and a control assembly. When a first ball falls to a roll-back slideway, the teaching tool controls an electromagnet to release an absorbed second small ball through sensing the weight changes of the roll-back slideway and performs the swinging motion demonstration, thereby improvignthe teaching extensibility.

The invention belongs to the technical field of projectile motion analysis, and particularly relates to a method for quickly obtaining high-speed impact extrusion resistance of a projectile. Accordingto the method, a result obtained by carrying out extrusion process simulation through a finite element method is taken as a sample, and an agent model is constructed by utilizing a self-adaptive RBF(Radial Basis Function) neural network, so that rapid calculation of the high-speed impact extrusion resistance of the projectile at different initial extrusion speeds is realized. According to the method, the integrity and calculation precision of numerical simulation can be kept, the overall solving time can be greatly shortened, and the scientific research efficiency and scientificity are improved.

An 'experimenter for automatically recording horizontal projectile motion trails' is characterized in that a bottom plate is fixed by base fastening screws, balance adjusting bolts are used for adjusting longitudinal and horizontal bubbles to be balanced so as to guarantee the bottom plate to be horizontal, bubble levels are longitudinally and horizontally mounted in the bottom plate, needle bearing holes are drilled at four corners of the bottom plate, needle bearings are mounted in the bottom plate, balance adjusting screws are mounted in the needle bearings and easily movable in adjustment, a motion trail graph experimental bracket groove is mounted in a motion trail graph experimental bracket, a magnetic stripe is mounted in a magnetic stripe slot, an outer frame is used for supporting a heavy hammer, a trail graph board, a trail graph board chute, a ball falling baffle, a ball falling baffle adjuster, a steel ball rail, a steel ball rail fixing strip and a magnetic steel ball, the heavy hammer guarantees the experimental bracket to be perpendicular, the trail graph board is mounted in the trail graph board chute and is of a three-layer structure in design, a permanent-magnet magnetic core and missible oil are filled in mesh holes in the interlayer, the trail graph board is used with the magnetic steel ball and a magnetic eraser, images can be smoothly recorded and flexibly eliminated by the principle of repelling of like poles and attraction of unlike poles of permanent magnetism, a cotton thickened plate mounted in a ball falling baffle groove stops the steel ball from moving randomly in falling, the ball falling baffle adjuster is used for controlling falling height of the steel ball, the steel ball rail is used for ensuring the steel ball trail unchanged during each fixed experiment, the steel ball rail fixing strip made of aluminum alloy is drilled with holes at different positions so as to determine the steel ball rail not to move during each fixing and can be used for movably adjusting the steel ball rail, magnetic force of the magnetic steel ball passes through the trail graph board during horizontal projectile, the images are recorded by the principle of attraction of unlike poles of permanent magnetism, the trail graph board can be taken out conveniently by a through groove arranged on the upper side of the outer frame, and the steel ball motion trails can be clearly seen.

The invention discloses an experimental device for projectile motion study capable of displaying time in real time, which comprises a photographic lamp house, a glass panel, a projecting pipe, a photoelectric door, a time display, a digital camera and a tripod, wherein the glass panel is arranged on the front surface of the photographic lamp house; the projecting pipe is fixed on the left frame of the photographic lamp house; the photoelectric door is arranged at two sides of a pipe orifice at the low end of the projecting pipe; the time display is embedded into the upper right part of the photographic lamp house; the digital camera is fixed on the tripod; and a lens faces towards the photographic lamp house. When a small ball is ejected out of the pipe orifice at the low end of the projecting pipe to pass through the photoelectric door, the time display automatically starts timing, and the digital camera captures video of the whole projectile motion process of the small ball taking grid coordinates as a background, thus acquiring clear image, being capable of accurately reading X and Y coordinates, achieving high timing precision up to 0.01 second and being free from influence of ambient brightness while shooting. The experimental device has the advantages of short exposure time of the camera, no trails in the captured image, simple structure and high reliability, thus providing very convenient experimental conditions for studying projectile motion.

The invention discloses a demonstration device for physics education teaching and relates to the technical field of physics teaching tools. The demonstration device comprises a demonstration box, wherein a straight plate I is fixed on one side of the upper part of the demonstration box; a radar speed tester is fixed in a position right aligned to the straight plate I on the other side of the demonstration box; a spring I is fixed on a side surface close to the part above the straight plate I, of the demonstration box; a baffle plate I is fixed at the tail end of the spring I; a pull rack is fixed on one side close to the spring I, of the baffle plate I; a fixing block is arranged on one side surface below the straight plate I, of the demonstration box; a transverse rod is fixed on the fixing block; a straight plate II is rotationally connected with the fixing block; a support rod is rotationally connected with the bottom surface of the straight plate II; the support rod is fixed with the transverse rod through a fixing clamp. By adopting the demonstration device, horizontal projectile motion and oblique projectile motion in physics teaching are very well demonstrated, students canunderstand and learn the principles conveniently, and in addition, the whole device is convenient to move, diverse in function and very applicable to physics education teaching demonstration.

The invention discloses a novel calculation method for magnus force coefficients and resistance coefficients in an aerodynamics model. The model and the method aim at projectile motion of a spherical moving object. The method comprises the following steps of utilizing objective flying range data to carry out variable coefficient multielement differential equations calculation through a numerical value iterative method; carrying out layered optimization on obtained feasible solution sets, wherein the first layer is accuracy objective function optimization, and the second layer is smoothness objective function optimization; finally, utilizing the optimization to calculate to obtain the magnus force coefficients and the resistance coefficients, and continuously carrying out iteration solution. The accuracy of the obtained magnus force coefficients and resistance coefficients through calculation is ensured through layered optimization. The method is small in calculated amount and error, only relies on the flying range data under different speeds, can easily acquire the data under a real environment, and has stronger universality.

The invention relates to a method and a device for ejecting and preparing homogeneous particles by pulsing lateral parts of holes. The method comprises the following steps that: under the condition of pressure difference between inert gases inside and outside a melting pool, a raw material is heated to a molten state by a heater; piezoelectric ceramic is stimulated by a pulse driving signal to generate a displacement towards one side of a crucible with the holes; the displacement is transmitted to a molten body by a transmission rod and a pressing plate to ensure that a certain quantity of micro molten bodies are ejected through small holes of different sizes on the lateral part of the crucible and then perform similarly horizontal projectile motion at different initial speeds; and the ejected micro molten bodies generate different horizontal displacements during falling, so that the homogeneous particles of different particle sizes can be obtained hierarchically at the bottom. The particles prepared by the method and the device have a uniform size, homogeneous components, controllable particle sizes and high sphericity; and the method and the device are suitable for various materials with lower melting points, can meet the requirements of continuity and stability in a production process, particularly can fulfill the aim of automatic layering at the bottom, greatly improve the production efficiency, and fully meet the requirements and development of modern microelectronic packaging industries.

The invention discloses a textile dust collection device which comprises a base, wherein a box body is fixedly connected to the upper surface of the base; one side face of the box body is fixedly connected with an air inlet; the other side face of the box body is fixedly connected with an air suction mechanism; a water tank is fixedly connected to the bottom of an inner cavity of the box body; the inner wall of the box body is fixedly connected with a water pump; one end of the water pump is fixedly connected with a water duct; and the surface of the water duct is fixedly connected with a spray header. According to the textile dust collection device, a fan is driven to drive air to circulate by operating the motor, and the air flows to produce suction force, so that textile dust is sucked into the box body from the air inlet, the water pump in the box body is operated, the water is extracted to enter the water duct and sprayed by the spray header, and the textile dust is wetted by the water in the inflowing process; and then the weight is increased. Therefore, the textile dust makes a projectile motion to drop into the water tank, and the effect of conveniently collecting the textile dust is achieved.

The invention provides a multifunctional continuous projectile motion experiment instrument which comprises a water outlet pipe fixing block, a track marking plate, a constant flow device and a base water storage box, wherein the water outlet pipe fixing block is adsorbed on the track marking plate through a strong magnetic material and can be freely moved; the track marking plate is put in the base water storage box; and the constant flow device is arranged behind the base water storage box and is positioned behind the track marking plate. The multifunctional continuous projectile motion experiment instrument has the advantages that the operation is simple and convenient; experiment data can be easily obtained; the data processing is convenient and fast; the horizontal projectile motion can be studied; and the oblique upward projectile motion and the oblique downward projectile motion can also be studied.