101 results about "Impact acceleration" patented technology

The invention relates to a rotating impact acceleration device and a method of a power drilling tool. The device is characterized in that a rotor transmission shaft, a driving tooth-shaped impact hammer and a driven impact transmission joint are mounted at the inner side of a stator outer cylinder; the lower end of the rotor transmission shaft is in threaded connection with the driven impact transmission joint; the middle part of the rotor transmission shaft and the middle part of the stator outer cylinder are formed to a cylindrical cavity; an impact force accumulating spring is mounted in the cavity; the lower end of the impact force accumulating spring fits the driving tooth-shaped impact hammer; a tooth-shaped curved surface is arranged at the lower end of the driving tooth-shaped impact hammer, and is engaged with a tooth-shaped curved surface at the upper end of the driven impact transmission joint; the driven impact transmission joint is driven by the rotor transmission shaft to generate a rotating motion corresponding to the driving tooth-shaped impact hammer; and the driving tooth-shaped hammer and the impact force accumulating spring generate axial reciprocating impact on the driven impact transmission joint to realize the rotation and the impact. The device is simple in structure and shorter in length, and dose not influence the operations of the power drilling tool and a measuring tool while drilling.

The invention discloses a mobile terminal based tumble detecting method. The mobile terminal based tumble detecting method comprises the steps as follows: detecting a total accelerated velocity SVM1 and judging whether the total accelerated velocity SVM1 exceeds a set weightlessness threshold Amin; when SVM1 is smaller than Amin, detecting and synthesizing a direction signal omega1 and judging whether the direction signal omega1 exceeds a set inclination angle threshold omegamin; when the omega1 is smaller than the omegamin, detecting a total angular velocity omega and judging whether the total angular velocity omega exceeds a set angular velocity threshold omegamin; when the omega is greater than the omegamin, detecting a total accelerated velocity SVM2; when the total accelerated velocity SVM2 is greater than a set impact acceleration threshold Amax within a set detecting time t1, detecting and synthesizing a direction signal omega2 and judging whether the direction signal omega2 exceeds a set human body tumble gradient threshold omegamax; when the omega2 is less than the omegamax, indicating that the person has tumbled; processing a signal judging that the person has tumbled into a voice prompt signal and an image display signal. By referring to the feature acceleration, the human body inclination state, the angular velocity and the like in the tumble process of the human body and using a built-in sensor in a mobile phone to obtain necessary parameters, the mobile terminal based tumble detecting method can analyze and judge whether the person tumbles.

A hull design with a maximally narrowed lower hull comprised of a stepped inboard chine and a concave centerline section resulting in the center of buoyancy and center of gravity preferably being in the same longitudinal position. The narrow lower hull optimally reduces the wetted surface area required, thereby reducing power requirements, fuel costs, and increasing speed potential. Exemplary dimensions for a forty-five (45') foot hull are disclosed. The hull has a much deeper transverse step (note FIG. 3) to more effectively exploit the potential advantages of internal chines and lifting strakes, which deeper transverse step effectively achieves a bi-modal hull form-displacement and planing. The hull form consistently achieves and maintains the flow separation needed to assure the low surface area needed for minimum planing resistance and minimum sea wave impact acceleration. Additionally, the hull's convex curvature in the narrow planing region of the hull shifts the center of dynamic pressure forward, providing a more balanced acceleration, with less extreme boat attitudes, in the transition from displacement to planing mode, as well as when operating at steady speeds over the entire speed range.

The invention discloses a ball mill impact collision simulation test bed and a ball mill impact collision simulation method. The ball mill impact collision simulation test bed comprises a light gas gun, a steel ball, a high-speed camera, a dynamic strain gauge, a photoelectric speed measuring device and a data collection device, wherein the steel ball is launched by the light gas gun, the movement speed of the steel ball is measured through the photoelectric speed measuring device, the steel ball impacts a cylindrical rock test sample through a test box, the cylindrical rock test sample strikes a lining plate test sample under the impact load effect, the rock test sample and the lining plate test sample are horizontally arranged in an arc groove of a test box stander, the center of the arc groove is leveled to the center of the steel ball, the accuracy of the impact process is guaranteed, the impact collision process is precisely captured through the high-speed camera, an impact acceleration sensor, a strain plate and the like are arranged on the surface layer of a cushion test sample, an output signal is collected through the dynamic strain gauge and a data collection card, the signal is processed through a computer data processing system, so that the dynamic mechanics performance of a material in the ball mill impact collision process can be accurately achieved.

The invention discloses a traceable calibration method for dynamic characteristics of a high-shock acceleration transducer, and belongs to the technical field of acceleration transducer measurement. The traceable calibration method is as follows: a very narrow pulse is used for exciting the high-shock acceleration transducer on the basis of realizing the traceable calibration under the condition of a broad pulse for the high-shock acceleration transducer to be calibrated to measure a frequency response characteristic of the high-shock acceleration transducer by a test or metrologic instrument and realize the traceable calibration of the dynamic characteristics thereof. A formula of minimum calibration broad pulse width t1 and a formula of maximum narrow excitation pulse width t2 which are required by the traceable calibration are deduced by the traceable calibration method according to different natural frequencies of the high-shock acceleration transducer with higher calibrated natural frequency (above 50kHz) and great acceleration amplitude (up to 2.0*10<5>g). The new technological breakthroughs are meaningful and valuable to the calibration theories and the practical application. The traceable calibration method for the dynamic characteristics of the high-shock acceleration transducer is worthy application and popularization.

An automotive door handle device includes: a handle (3) that moves between a door closing position and a door opening position; a lever (4) that rotates from a waiting position to a lock releasing position in synchronization with an operation of the handle (3) from the door closing position to the door opening position, and releases locking of a door locking mechanism; and a stopper member (5) that is provided on the bracket (2) so as to be freely rotatable, moves between a waiting position of not interfering with an engagement portion (3a) of the handle (3) and an interfering position of interfering with the engagement portion (3a), and is urged to the waiting position side. When an impact acceleration in a direction of moving the handle (3) from the door closing position to the door opening position is inputted to a door body, the stopper member (5) moves in an interfering position direction from the waiting position against urging force of a spring by this impact acceleration, and inhibits the lever (4) from moving to the lock releasing position. A shock absorption member (12) is provided on an other-side rotation regulating portion (2a) against which a stopper-side rotation regulating portion of the stopper member (5) thrusts at the interfering position.

The invention provides a large-load high-g-value pneumatic vertical impact testbed, mainly including five parts, i.e., a housing assembly, an anvil block assembly, a working table board assembly, a clamping release assembly and a cylinder assembly. The impact testbed performs two-stage expansion in a driving cylinder to push a driving piston to accelerate vertically downwards, explosion energy of an air cannon is large, a test piece on the testbed obtains large-magnitude impact acceleration, driving of the working table board assembly is realized through cooperation of the air cannon with the driving cylinder and driving piston, a sealing ring does not need to be arranged between the driving piston and the driving cylinder, and frictional resistance during vertical movement of the working table board assembly can nearly be ignored; and thus a load that can be loaded on a working table board can be effectively increased, making an impact test of a large-load test piece possible. At the same time, the testbed also has the advantages of compact structure, simple structure of constituent parts, easy machining, relatively low cost and the like.

The invention provides a high impact acceleration test system and test method. Through collision of a test projectile and an incident bar of a Hopkinson bar, an impact acceleration signal having an amplitude of (1-8)*104g and a pulse width of 0.5ms to 2ms is generated, and a test system and a test method are provided for researching various performances of a missile-borne electronic device in a high compact environment. The high impact acceleration test system and test method are high in impact energy and controllable in an impact environment and have good repeatability and leading technical performance. The test method can provide an impact environment having an order of magnitude similar to that of a large real test for a subsystem and a component product of a kilogram scale in laboratory conditions, can be applied to study the impact resistance of a penetrating fuse and the buffer performance of a buffer material, calibrate an acceleration storage test device, study the zeroing characteristic of a high impact accelerometer and so on, and can also provide test conditions for studying the impact resistance of other missile-borne electronic device, such as a micro-electro-mechanical system (MEMS) device, a black box, a spinning top, a chip and so on.

The invention relates to a multi-parameter real-condition monitoring method for well completion of an underground perforator, belonging to the technical field of underground measurement of petroleum, natural gas and the like. Aiming at severe environments such as high temperature, high pressure and high impact and the like in the process of well completion of the perforator, a monitoring instrument of the underground perforator and a monitoring instrument outside the perforator are specially researched by utilizing the method, and are leading instruments with innovative design and independent invention; and testers inside and outside the underground perforator are used for monitoring simultaneously, and processing monitored data in real time so as to obtain multiple parameters of real conditions of the underground well completion effect in perforation or / and fracture: internal pressure of the perforator, the external annular pressure of the perforator, self impact acceleration of the perforator, ambient temperature in perforation or / and fracture and the like. By utilizing the method, the high and new technologies such as variable-frequency sampling, digital processing, sensor, microminiature, micropower consumption, high temperature resistance, high pressure resistance, high impact resistance and the like are integrated, the technological content is high, the functions are strong, the performance is good, the design is advanced, the structure is reasonable, and in addition, the multi-parameter real-condition monitoring method is precise, stable, reliable and practical and has values for promotion and use.

A passive safety system has a passive safety device mounted on a vehicle, and a passive safety control means having an acceleration sensor detecting acceleration caused by an impact at the time of collision. The passive safety control means receives input an impact acceleration detection signal from the acceleration sensor and operates controllably the passive safety device. Further, the passive safety control means computes a physical quantity based on the impact acceleration detection signal inputted from the acceleration sensor, sets maximum and minimum reference values of the physical quantity in normal driving, performs a computation with respect to addition of a present acceleration inputted from the acceleration sensor to an integrated acceleration value at this point in time when the physical quantity crosses a range defined between the maximum and minimum reference values, and performs a computation with respect to a reset process of the integrated acceleration value when the physical quantity remains within the range defined between the maximum and minimum reference values.

The invention relates to the technical field of well drilling hydraulic torque force impact tools, and provides a frequency-adjustable torque force impact acceleration device. The frequency-adjustable torque force impact acceleration device comprises an outer cylinder, an impact cylinder, a reversing sleeve base, an impact hammer, a reversing sleeve, a gland, a diversion filter screen, a bearing pedestal and a lower connector. An upper step hole, a middle step hole and a lower stop hole are formed in the outer cylinder, wherein the inner diameters of the upper step hole, the middle step hole and the lower step hole are sequentially decreased. The frequency-adjustable torque force impact acceleration device is reasonable and compact in structure, few in part and convenient to assemble, interval parts are not prone to damage and can not get stuck, an internal thread in the inner wall of the lower connector below the outer cylinder and an annular table does not need to be connected with a drill stem through a conversion connector any more, and the impact frequency can be regulated according to requirements by regulating a spray nozzle. Meanwhile, impact force can be directly transmitted to a drill bit and is converted into mechanical impact force through drilling hydraulic force, and therefore the drill bit can obtain stable torque and unceasingly cut a stratum to eliminate stick slip, the service life of the drill bit is prolonged, the drilling speed in hard rock layers is increased, great drilling cost and drilling time are saved, and the application range is wide.

The invention provides a metal rubber-disc spring all-metal three-way composite support for piping vibration isolation and impact resistance. The metal rubber-disc spring all-metal three-way composite support comprises metal rubber mats and disc springs, a center net, a locking nut, a pressure cover, a guide holder, a mounting base and a base plate, wherein the metal rubber mats and the disc springs are used for bearing vertical vibration and impact load, the center net is used for bearing horizontal vibration and impact load, the locking nut, the pressure cover, the guide holder, the mounting base and the base plate are used for supporting and fixing an elastic component. By the aid of large bearing capacity and flexible rigidity characteristic, Coulomb damping among the disc springs, and the Coulomb damping between hard rigidity characteristic of the metal rubber mats and the disc springs, the flexible and hard rigidity complex characteristics and larger damping on the vertical bearing direction can be realized. The metal rubber-disc spring all-metal three-way composite support is compact in structure, light in weight, high in high-temperature environment adaptability, good in damping capacity, and lower in vibration isolation frequency, and vertical rigidity has higher static rigidity and lower dynamic rigidity; besides, considerations are also given to shock isolation and a limiting function, so that three-way impact acceleration responses and impact displacement responses can be kept within a reasonable range.

The invention provides a safety impact protection method and a structural vibration monitoring instrument. The safety impact protection method is applied to the structural vibration monitoring instrument. The safety impact protection method includes the following steps that: a three-axis acceleration sensor measures the three-axis acceleration of a monitored object; the vector sum of the three-axis acceleration is calculated, so that the impact acceleration of the monitored object can be obtained; a signal processing chip judges whether the impact acceleration is greater than or equal to a preset impact acceleration threshold value; if the impact acceleration is greater than or equal to the preset impact acceleration threshold value, the signal processing chip determines that the monitored object is subjected to impact, and takes safety protection measures for the monitored object. With the safety impact protection method provided by the technical schemes of the invention adopted, whether an instrument is subjected to impact can be timely and effectively judged.

The invention relates to a laser Doppler vibration measurement method impact acceleration measurement method, and belongs to the technical field of impact measurement test. The laser Doppler vibration measurement method impact acceleration measurement device comprises a HOPKINSON impact machine, an elastic body, a cushion layer, a HOPKINSON bar, an anvil body, a corrected impact acceleration sensor, a computer, a digital oscilloscope, a differential laser interferometer and a signal tuner. Impact acceleration waveforms are acquired by the mode of realizing filtering differential through average filtering in a local window and then differential so that the problem of wrong direction of an ISO standard recommendation method can be avoided. Besides, the average value of the absolute values of the deviation of a local end base straight line and each measurement value point to act as an error scale identification function of average filtering in the range of the average filtering window, and the relation curve of the identification function value and rising time and the local average window width ratio acts as the criterion of searching the optimal average window so as to solve the problem of optimal filtering.

A passive safety system has a passive safety device mounted on a vehicle, and a passive safety control means having an acceleration sensor detecting acceleration caused by an impact at the time of collision. The passive safety control means receives input an impact acceleration detection signal from the acceleration sensor and operates controllably the passive safety device. Further, the passive safety control means computes a physical quantity based on the impact acceleration detection signal inputted from the acceleration sensor, sets maximum and minimum reference values of the physical quantity in normal driving, performs a computation with respect to addition of a present acceleration inputted from the acceleration sensor to an integrated acceleration value at this point in time when the physical quantity crosses a range defined between the maximum and minimum reference values, and performs a computation with respect to a reset process of the integrated acceleration value when the physical quantity remains within the range defined between the maximum and minimum reference values.

The invention discloses a pneumatic type high acceleration vertical impact table, which mainly comprises a support frame, a impact cylinder, a piston assembly, a buffer mechanism, a piston limiting release mechanism and the like. The working process of the pneumatic type high acceleration vertical impact table is as follows: the piston assembly is assembled in the impact cylinder, and a piston is locked and limited by the piston limiting release mechanism, and then, the impact cylinder is rotated in a vertical status and well fixed, and the impact cylinder is inflated until reaching a setting pressure; the locking of the piston by the piston limiting release mechanism is removed, air in an air chamber of the impact cylinder can drive the piston assembly to make accelerated motion downwards; and when the piston collides a shock pad arranged on an anvil, a required impact acceleration and a pulse duration are generated. The pneumatic type high acceleration vertical impact table is compact in structure, easy to operate, capable of generating large impact energy and realizing different impact accelerations and pulse durations by adjusting an inflation pressure and the shock pad. The pneumatic type high acceleration vertical impact table is particularly suitable for a sample of which the mass is less than 0.5kg, and a acceleration of 500g-5000g and a half-sine impact wave shape with pulse duration of 10ms-3ms can be generated.

The invention discloses a normally closed micro-mechanical inertia electrical switch, and belongs to the technical field of micro-electro-mechanical engineering. The normally closed micro-mechanical inertia electrical switch comprises an insulating substrate, a siamesed serpentine spring, a support layer, a fixed contact electrode, a spring support seat, a mass block electrode and a continuum between springs, wherein the fixed contact electrode and the support layer are all positioned on the insulating substrate; the mass block electrode is positioned above the fixed contact electrode, and is contacted with the fixed contact electrode; the spring support seat is fixed on the insulating substrate and positioned on two sides of the support layer; the siamesed serpentine spring is positioned above the support layer; one end of the siamesed serpentine spring is connected with the spring support seat, while the other end is connected with the mass block electrode; and the continuum between the springs is positioned in the middle of the siamesed serpentine spring and is connected with the siamesed serpentine spring on the two side. The normally closed micro-mechanical inertia electrical switch effectively improves the contact effect between the mass block electrode and the fixed contact electrode; and the mass block electrode cannot collide with the spring support seat violently under outside impact acceleration, so the damage to devices is effectively prevented.

The present invention is a small online impact detection test stand which is characterized in that: an accelerated mechanism is an inertial accelerator that a motor and a belt pulley drive a roller assembly to rotate through a pneumatic clutch mechanism and a wire rope pulls a sliding platform to move, a clutch for an automobile is used to drive the acceleration mechanism, a dynamic condition of automotive driving is effective simulated, a frequency converter is used to adjust an impact acceleration, and impact pulse width adjustment is formed through synchronous adjustment of variable frequency drive frequency and a waveform pad. Thus an impact acceleration value and a pulse width are continuously adjustable in a large range, and the needs of small laboratory detection and production on-line detection are satisfied.

The invention discloses a portable safety monitoring system for precise instrument transport. The system comprises a signal acquisition unit, a signal conditioning conversion unit and a signal processing unit, wherein the signal acquisition unit is used for acquiring the vibration and impact acceleration information of a packaging box of the precise instrument in the transport process and transmitting the acceleration information to the signal conditioning conversion unit in a charge signal form; the signal conditioning conversion unit is used for converting the charge signal into a voltage signal and converting the voltage signal into a digital signal to be transmitted to the signal processing unit; and the signal processing unit is used for converting the digital signal into corresponding physical quantity and storing the physical quantity and giving a warning when the physical quantity exceeds an alarm threshold. According to the system, the precise instrument can be prevented from being damaged in the transport process, and the maintenance cost is reduced.

The invention discloses recyclable rocket landing working condition simulation equipment based on a rope drive parallel robot, and relates to a recyclable rocket landing working condition simulation device. The invention aims to solve the problem that an existing landing support mechanism prototype cannot simulate recoverable rocket landing working condition, so that the process of actual return of the rocket can not be simulated and verified. A posture control device comprises a supporting frame and a plurality of driving units, the plurality of driving units are arranged on the eight vertexangles of the supporting frame; a measuring device comprises an operation control machine and an impact acceleration test platform, the impact acceleration test platform is installed in the support frame, a suspension unlocking mechanism is installed on the impact acceleration test platform, the suspension unlocking mechanism comprises a suspension release mechanism and a landing support mechanism, the landing support mechanism is installed on the impact acceleration test platform, the suspension release mechanism is installed on the landing support mechanism, and the suspension releasing mechanism is connected with the driving units through a steel wire rope. The equipment is applied to the field of aerospace.

Based on respective output signals (S4, S5, S7, S8) satellite sensors (4, 5) provided in an impact zone of a front section of a vehicle (1); an X-direction sensor (7) that detects an impact acceleration of the vehicle in a traveling direction thereof; a Y-direction sensor (8) that detects an impact acceleration in a direction that is orthogonal to the traveling direction, a control unit (6) that controls the operation of an air bag device (2) includes: a selection output portion that fetches, from among output signals (S40, S50) from the satellite sensors (4, 5) and an output signal (S80) from the Y-direction sensor (8), the output signal with the higher value; and a determination portion (9) that performs a collision determination of the vehicle (1) in response to the output signal (S7) from the X-direction sensor (7). A level of a threshold value used for the collision determination performed by the determination portion (9) is set based on the output signal selected by the selection output portion. In the case that the output signals (S4, S5) from the satellite sensors (4, 5) cannot be obtained, the level of the threshold value used for the collision determination is set based on the output signal (S80) from the Y-direction sensor (8), thereby allowing the operation of the collision determination to be maintained appropriately.

The invention relates to a test device for testing the change of the sensitivity output of an impact accelerometer with temperature. The test device comprises a temperature control box, a metal rod, apneumatic system, an accelerometer signal amplifier, a laser interferometric speed measuring device, and a computer for data sampling and data processing; the metal rod is horizontally supported by asupporting structure and can move freely axially; one end of the metal rod is aligned with the pneumatic system; the other end of the metal rod fixes an accelerometer to be tested and is arranged inthe temperature control box; the output signals of the accelerometer are inputted to the signal amplifier through a wire; the laser interferometric speed measuring device emits laser onto the metal rod and receives reflected laser; the output signals of the accelerometer signal amplifier and the laser speed measuring device are connected with the computer through data wires; and a relationship between the sensitivity output of the accelerometer to be tested and temperature is obtained by means of an absolute method. The test device of the invention has the advantages of large impact acceleration, directness and relatively high accuracy.

A shock absorber with a possible minimum peak value of the impact acceleration during a collision. The shock absorber includes a tubular cylinder part with an opening at one end and the other end closed, a seal part configured to seal the internal space of this cylinder part at a part closer to this one end inside this cylinder part, fluid filled in the enclosed space formed by this seal part inside this cylinder part, a slidable piston part inside this enclosed space, and a rod part that slidably penetrates this seal part concentrically and is connected to this piston part at one end while projecting out to the other side. This cylinder part has a tapered inner surface inside this enclosed space, reducing its internal diameter from the one end to the other end, and the rate of this taper is within the range from 1 / 50 to 1 / 130.

The invention relates to a bi-axial MEMS in-plane high-g sensor based on a micro beam detection structure. By means of the bi-axial MEMS in-plane high-g sensor, acceleration measurement in the horizontal direction can be achieved. The bi-axial MEMS in-plane high-g sensor comprises a silica-based supporting frame and four sensitive structures, wherein the silica-based supporting frame comprises a silica-based frame and a central anchor block fixedly connected to the surface of the silica-based frame, the four sensitive structures are evenly distributed around the central anchor block, and every four voltage dependent resistors in the same axial direction form a Wheatstone full bridge. Detection can be carried out in the X direction and the Y direction through two different units respectively, namely, two independent detection units in the X direction and the Y direction, and therefore measurement of high-g acceleration signals in the horizontal plane can be achieved. The bi-axial MEMS in-plane high-g sensor is reasonable and simple in structure, low in transverse sensitivity, easy to integrate, good in sensitivity and overload resistance and suitable for measuring the high-g impact acceleration, and the machining process is simple.

The invention relates to a three-axis high-impact sensor calibration adapter device based on a Hopkinson rod, and belongs to the technical field of weapon testing. Specifically, it includes the Z-direction anvil body calibration adapter device for Z-axis shock sensitivity and X-axis and Y-axis lateral sensitivity calibration, and the XY-direction anvil body calibration transfer device to realize Y-axis shock sensitivity and X-axis and Z-axis lateral sensitivity calibration. Calibration, or calibration of X-axis shock sensitivity and Y-axis and Z-axis transverse sensitivity; applied to the calibration experiment of Hopkinson rod high shock acceleration sensor, two sensor calibration adapters jointly complete the calibration of the calibrated high shock three-dimensional MEMS acceleration sensor Calibration of three-axis shock sensitivity and three-axis transverse sensitivity; can accurately obtain the relationship between each axial response and transverse response of high-impact three-dimensional MEMS acceleration sensors; has the advantages of strong shock resistance and high overload resistance.

The invention relates to a micro-electro-mechanical system (MEMS) sensor, in particular to a beam island tower shaped piezoresistive type three-axis MEMS high-range acceleration sensor array. By the beam island tower shaped piezoresistive type three-axis MEMS high-range acceleration sensor array, the problems of excessively large coupling, low mechanical precision and excessively large volume and quality of the traditional piezoresistive MEMS acceleration sensor are solved. The beam island tower shaped piezoresistive type three-axis MEMS high-range acceleration sensor array comprises a first six-beam double-island T-shaped structure sensor, a second six-beam double-island T-shaped structure sensor and a four-beam frustum structure sensor, wherein the first six-beam double-island T-shaped structure sensor comprises an X-axis acceleration sensor, a Z-axis low-range acceleration sensor and a first square silicon-based framework; and the second six-beam double-island T-shaped structure sensor comprises a Y-axis acceleration sensor, a Z-axis middle-range acceleration sensor and a second square silicon-based framework. The beam island tower shaped piezoresistive type three-axis MEMS high-range acceleration sensor array is suitable for measuring impact acceleration of high range.

The invention relates to the field of train collision experiments, discloses a construction method and system for a train scaling equivalent model applied to a collision experiment and aims to solve the existing technical problem that scaling model construction is complicated. According to the method, following the principle that a scaling model and an actual train impact acceleration are consistent, integral conversion is performed on a kinetic equation under the condition of not considering damping to obtain scaling factors of train mass and impact force and scaling factors of train speed and time; scaling criteria are formulated according to the scaling factors of the train mass and the impact force and the scaling factors of the speed and the time; and according to the scaling criteria, parameters of the scaling model are determined to construct the scaling model.

The invention discloses a method for recording and tracking a firearm. The method includes steps of providing the firearm; arranging a control unit and an acceleration sensor which are connected with each other on the firearm; enabling the acceleration sensor to detect current acceleration values of the firearm, converting the acceleration values into electric signals and transmitting the electric signals to the control unit; enabling the control unit to implement corresponding actions on the basis of the electric signals of the different acceleration values. The method has the advantages that bullets can be shot by the firearm, the firearm can instantly generate acceleration under the effect of recoil force generated when the bullets instantly fly forwardly, the acceleration generated by the firearm is far higher than acceleration generated by common impact, the acceleration sensor is mounted on the firearm, accordingly, the bullet shooting acceleration values of the firearm can be accurately acquired by the acceleration sensor and can be strictly differentiated from common impact acceleration values, false triggering can be prevented, and the quantity of the bullets can be accurately computed.

The invention provides a sensor based on MEMS capacitive micro-accelerometers and an attitude and heading reference instrument. The sensor based on MEMS capacitive micro-accelerometers comprises a base, a plurality of MEMS capacitive micro-accelerometers arranged on the base, and a power module supplying power to the MEMS capacitive micro-accelerometers, wherein the axes of the MEMS capacitive micro-accelerometers form preset included angles. The sensor based on MEMS capacitive micro-accelerometers can be applied to automobile positioning, fine agricultural machinery vehicle navigation, fireproof unmanned aerial vehicles in forest regions, precision guided weapons, satellite detection and the like and has the advantages of good environmental adaptation and small variation with temperature;the sensor can acquire current acceleration information in real time accurately, improve the measurement precision, and continuously measure impact acceleration without obvious change in performancecharacteristics.