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30results about How to "Accurate hit" patented technology
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Robot-assisted system and method for controlling flexible needle to puncture soft tissues in real time
InactiveCN102018575AReal-time adjustmentAccurate hitDiagnosticsSurgical navigation systemsMedical equipmentData acquisition
The invention provides a robot-assisted system and method for controlling a flexible needle to puncture soft tissues in real time, belonging to the technical field of medical equipment for minimally invasion surgeries (MIS). The system comprises a flexible needle puncture device, a driving device, a mechanical sensor, a data acquisition card and a computer, wherein the computer comprises stepping motor movement control software, force signal processing software and a flexible needle control algorithm. The method is used for realizing needle puncture movement through the following steps: regarding puncture process as a quasi-static process and any needle section as a cantilever, wherein each needle section is described by vector and is regarded as a cantilever; computing the deflection and cross section rotating angle of the needle section according to the theory of cantilever; and computing the positions of the needle body and the needle point in real time by iteration. According to the invention, real-time adjustment of the position of the needle body in the process of puncture is realized, thus effectively keeping away from the barriers in the process of puncture and precisely hitting the target; and further the degree of fatigue of the doctors is reduced, pains of the patients are alleviated, and the surgery risks are reduced.
Owner:TSINGHUA UNIV
Method for calculating jet-flow pitch angle of automatically-tracked-positioned jet-flow extinguishing device
ActiveCN103768748AAccurate hitMeet the needs of jet fire extinguishing precisionFire rescueJet flowControl system
The invention belongs to the technical field of fire detection and particularly relates to a method for calculating a jet-flow pitch angle of an automatically-tracked-positioned jet-flow extinguishing device. According to the method, primary parameter measurement and self-correction are carried out on automatically-tracked-positioned jet-flow extinguishing device installed on the spot so as to meet jet-flow extinguishing precisions of different mounting environments, a current positioning angle is obtained by virtue of an angle feedback instrument when a fire source is successfully positioned by the automatically-tracked-positioned jet-flow extinguishing device, and the flow path is counted, so that the pitch angle of the extinguishing jet flow and a deflection angle required for the correction of a gun muzzle can be obtained. When the fire source is positioned by the automatically-tracked-positioned jet-flow extinguishing device after a fire breaks out, a deflection angle required by a gun muzzle extinguishing movement is calculated according to a given jet-flow pitch angle formula and is transmitted to a motor control system after a value of an included angle between a gun barrel and a ground vertical line is collected according to an angle feedback value and is transmitted to a front-end data processing platform, thus finishing the angle correction of the extinguishing jet flow.
Owner:HEFEI KDLIAN SAFETY TECHNOLOGY CO LTD
Convenient and fast hardware positioning hammer
InactiveCN105643568AImprove accuracyImprove securityDispensing apparatusPortable percussive toolsPistonEngineering
The invention relates to a convenient and fast hardware positioning hammer. The convenient and fast hardware positioning hammer comprises two parts, namely a hammer body and a positioning barrel; the hammer body comprises a hammer head and a hammer handle; a hammering plate made of ferromagnetic materials is fixed to the bottom of the hammer head, and an electromagnetic column is installed inside the hammer body; the electromagnetic column is electrically connected with an energy storage power source, and a control switch is further in series connection between the electromagnetic column and the energy storage power source; the positioning barrel comprises two barrel halves, and the two barrel halves can be spliced into the complete barrel through hasps; the barrel halves comprise an air cylinder and a piston column, and the piston column can slide freely along the inner wall of the air cylinder; a vent hole is formed in the bottom of the air cylinder; a permanent magnetic piece is fixedly installed at the top of the piston column; a rubber pad is further attached to the side wall of the air cylinder. When the convenient and fast hardware positioning hammer is used, the hammer head can hit a nail accurately, and the accidental injury probability is effectively lowered; meanwhile, the nail is effectively prevented from bursting out, and therefore the convenient and fast hardware positioning hammer is safer and more reliable to use.
Owner:南通荣茂电子科技有限公司
Air cannon test device and test method for accurately striking inner position of narrow space
The invention discloses an air cannon test device and test method for accurately striking the inner position of a narrow space. The device comprises an air cannon barrel and a bullet support positioned in the air cannon barrel, wherein the air cannon barrel comprises an elongated insertion tube, the front end of the insertion tube is provided with a bullet support emission outlet, the insertion tube is of an elongated shape, on the premise of not influencing the flying speed of a projectile, a muzzle is inserted into a narrow space, and the accurate striking of the whole blade disc blade in anarrow space is realized. The bullet support adopts a nylon material in order to reduce the quality of the bullet support, so that the damage and influence of the bullet support on the blade are reduced. The air cannon test device can improve the test precision of the tested blade in a narrow space.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Field climbing rope capable of being projected
InactiveCN107726929AAccurate hitAccurate lockAmmunition projectilesBows/crossbowsHand heldAgricultural engineering
The invention discloses a field climbing rope capable of launching, which includes a special soft rope for climbing and a long-handled crossbow. The long-handled crossbow can be installed on a conventional hand-held crossbow and fired by the conventional hand-held crossbow. The climbing The end of the special soft rope is connected with the hand-cranked reel, and the long-handled crossbow bolt is provided with a side rotation steering rudder and a conventional crossbow bolt handle, and the side rotation steering rudder is connected with the long handle crossbow bolt, and the side rotation An arc-shaped rack is arranged on the steering rudder, and a rope cover is arranged close to the special soft rope for climbing, and the arc-shaped rack is connected with the driving device arranged on the handle of a conventional crossbow bolt. The invention solves the difficulties that people face when hunting, climbing and crossing obstacles in the wild. It has a simple structure, is convenient to carry, has strong functions and reliable performance. It uses wireless means to measure the distance between the long-handled crossbow and the target, which is conducive to accurate Hitting or clinging to the target object is beneficial to climbing and surmounting obstacles, which is a major advancement in outdoor activity devices.
Owner:安庆市开发区轻捷户外用品经营部
Virtual table tennis ball player hitting training method based on reinforcement learning
The invention discloses a virtual table tennis ball player hitting training method based on reinforcement learning. The method comprises the following steps of 1) designing a task scene and a task flow; 2) training a ball hitting strategy of a ball bat by using the reinforcement learning method; 3) estimating a motion condition of each joint during ball hitting of a human body by using an inversekinematics algorithm; and 4) training a movement strategy of a root node through the reinforcement learning. According to the method, a virtual ball player who can carry out ball hitting with a reasonable posture and high accuracy can be obtained by designing a simple reward function without training data; complicated ball hitting rules do not need to be designed; meanwhile, due to the low-consumption characteristic of the forward operation of the reinforcement learning, a ball hitting action of the virtual ball player can keep the high frame rate stably, and a user has good interactive experience.
Owner:SOUTH CHINA UNIV OF TECH
Full-range coverage guidance system of remote guidance aircraft with strapdown laser seeker
ActiveCN111397441AAccurate hitCapable of full range coverageAiming meansGuidance systemFlight vehicle
The invention discloses a full-range coverage guidance system of a remote guidance aircraft with a strapdown laser seeker. The guidance system can control the aircraft to strike a remote target, a medium-range target or a short-range target, and has important engineering significance. Specifically, the guidance system comprises a decision module and a central processing module, wherein the decision module is used for selecting a guidance starting control module for executing work according to range information before launching; different guidance starting control modules can control differentcomponent modules to start work, so that corresponding component modules are controlled according to different ranges; and the central processing module generates a rudder deviation instruction by receiving information transmitted by the component modules, and controls the aircraft to fly to the target.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Satellite loss prevention remote guidance aircraft considering full-range coverage
ActiveCN111377064AAccurate hitProvide quicklyCosmonautic vehiclesSpacecraft guiding apparatusFlight vehicleControl engineering
The invention discloses a satellite loss prevention remote guidance aircraft considering full-range coverage. The aircraft can strike a long-range target, a medium-range target and a short-range target, and is capable of avoiding out-of-control under the condition of staged satellite loss, thereby having important engineering significance. The remote guidance aircraft particularly comprises a decision making module and a central processing module, wherein the decision making module is used for selecting a guidance starting control module for executing work according to range information beforelaunching; and different guidance starting control modules can control different assembly modules to start to work, so that the corresponding assembly modules are controlled according to different ranges. The central processing module generates a rudder deviation instruction by receiving information transmitted by the assembly module and controls the aircraft to fly to a target, and a quasi-satellite guidance resolving sub-module capable of fitting a satellite signal during satellite loss is arranged in the satellite guidance module, so that the aircraft is ensured not to be out of control during satellite loss.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Anti-lateral deviation full-range coverage control system applied to remote guidance aircraft
ActiveCN111412793AAccurate hitEfficient smooth correctionSelf-propelled projectilesFlight vehicleControl system
The invention discloses an anti-lateral deviation full-range coverage control system applied to a remote guidance aircraft. According to the control system, the remote guidance aircraft can be controlled to hit a long-range target, a medium-range target and a short-range target, and the aircraft can be corrected back to a correct direction in the presence of large lateral deviation and finally hitthe targets, so that the important engineering significance is achieved. Specifically, the remote guidance aircraft comprises a decision-making module and a central processing module; the decision-making module is used for selecting guidance start control modules for executing work according to range information before launching, and the different guidance start control modules can control different assembly modules to start to work, so that the corresponding assembly modules are controlled according to different ranges; and the central processing module generates a rudder deviation instruction by receiving the information transmitted by the assembly modules so as to control the aircraft to fly to the targets, and in the medium guidance segment, corresponding navigation ratios are selected according to the lateral deviation distance of the aircraft during start control so as to calculate needed overload.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Targeting liver cell carrier and preparation method thereof
ActiveCN103143033BPromote enrichmentImprove targetingGenetic material ingredientsMacromolecular non-active ingredientsApolipoproteins EPolyethylene glycol
The invention provides a carrier for introducing genes into liver cells in a targeting mode and a preparation method thereof. The carrier is a compound consisting of lipidosome and apolipoprotein, wherein the lipidosome is prepared from bidodecyl dimethylammonium bromide and dioleoyl phosphatidyl ethanolamine and passes through double-layer coated phospholipids follicle modified by distearoyl phosphatidyl ethanolamine-polyethylene glycol-maleimide; and the apolipoprotein is ApoE. According to the constructed targeting gene carrier, the targeting property of the carrier is improved through the affinity concentration of ligand-receptor, the transfection efficiency and the concentration degree in the liver cells are improved, and the carrier has obvious liver cell targeting property and can serve as artificial membranes and excipients of various treatment agents, so that the curative effect of drugs is enhanced.
Owner:SHANXI MEDICAL UNIV
Overhead conductor ice hammer
ActiveCN101692570BNovel ideaIngenious designOverhead installationPortable percussive toolsEngineeringAir chamber
The invention discloses an overhead conductor ice hammer, which consists of a launching base and a hammer body, wherein the launching base comprises that the lateral surface of a closed air chamber shell is provided with an air inlet drain hole, a launching tube is hinged at the top of the air chamber shell through four brackets, the lower part of an air door extends into the air chamber shell and is plugged at an air inlet hole of the launching tube, a launching operation handle is hinged on the brackets through a pin shaft and is positioned at the upper part of the air door, and a spring isfixedly connected between a hole at the upper part of the air door and the launching operation handle. The hammer body structurally comprises that four wing-shaped striking plates are spliced on a well-shaped bracket and are jointed and attracted with magnetic steels, a support spring is arranged between the bottom of the striking plate and the well-shaped bracket, an internal convex part of a decomposition spring is embedded into a hole at the front end of the well-shaped bracket and is propped on the front parts of the four striking plates, and front rod bodies at the bottoms of the striking plates are spliced in holes at the back of the well-shaped bracket. The overhead conductor ice hammer has the characteristics of good ice removing effect and safe use.
Owner:LIANSHAN POWER SUPPLY COMPANY OF STATE GRID SICHUAN ELECTRIC POWER +1
Calculation method of jet pitch angle for automatic tracking and positioning jet fire extinguishing device
ActiveCN103768748BAccurate hitMeet the needs of jet fire extinguishing precisionFire rescueControl systemMotor control
The invention belongs to the technical field of fire detection and particularly relates to a method for calculating a jet-flow pitch angle of an automatically-tracked-positioned jet-flow extinguishing device. According to the method, primary parameter measurement and self-correction are carried out on automatically-tracked-positioned jet-flow extinguishing device installed on the spot so as to meet jet-flow extinguishing precisions of different mounting environments, a current positioning angle is obtained by virtue of an angle feedback instrument when a fire source is successfully positioned by the automatically-tracked-positioned jet-flow extinguishing device, and the flow path is counted, so that the pitch angle of the extinguishing jet flow and a deflection angle required for the correction of a gun muzzle can be obtained. When the fire source is positioned by the automatically-tracked-positioned jet-flow extinguishing device after a fire breaks out, a deflection angle required by a gun muzzle extinguishing movement is calculated according to a given jet-flow pitch angle formula and is transmitted to a motor control system after a value of an included angle between a gun barrel and a ground vertical line is collected according to an angle feedback value and is transmitted to a front-end data processing platform, thus finishing the angle correction of the extinguishing jet flow.
Owner:HEFEI KDLIAN SAFETY TECHNOLOGY CO LTD
Automatic changeable range training cannonball equipment
InactiveCN108801047AImprove work coordinationIncreased versatilityTraining adaptationEngineeringControl table
The invention discloses automatic changeable range training cannonball equipment. The automatic changeable range training cannonball equipment comprises a control table fixedly arranged on the ground.The control table is internally fixedly provided with a control cavity with a leftward opening. A first fixing rod is fixedly arranged on the upper end wall of the control cavity. A second fixing rodis fixedly arranged on the left end face of the first fixing rod. The left end face of the second fixing rod and the left end wall of the control cavity are fixedly matched and connected. The outer surface of the second fixing rod is provided with an upper sliding block in a sliding manner. A rotation motor is fixedly arranged on the lower end face of the upper sliding block. A third fixing rod is arranged below the second fixing rod. The left end face of the third fixing rod and the left end wall of the control cavity are fixedly matched and connected. A center supporting rod is fixedly arranged on the right end face of the third fixing rod. The lower end face of the center supporting rod and the lower end wall of the control cavity are fixedly matched and connected. The equipment is simple in structure and convenient to use, the automatic changeable range training cannonball equipment can be continuously used for soldier training, the target is accurately hit by changing the range and the angle, and accordingly the precision of usage of weapons by soldiers is greatly improved.
Owner:袁兴芳
Table tennis training table
A table tennis training table comprises a body of the table tennis training table. The body is composed of a tabletop, a partition net and four table legs. A vertical polished shaft is arranged at theleft end of the body. The polished shaft is fixedly connected with the table legs on the front side of the left end of the body through a support. The polished shaft is sleeved with a first sleeve and a second sleeve. The upper end of the first sleeve is movably connected with the lower end of the second sleeve through a bearing. A vertical guide groove is formed in the side face of the polishedshaft. A guide block is fixedly installed on the inner wall of the first sleeve. The guide block is inserted in the guide groove. A vertical first servo motor is fixedly installed on one side of the first sleeve. A first gear is fixedly installed on an output shaft of the first servo motor. The lower end of the second sleeve is fixedly sleeved with a second gear. The first gear is meshed and matched with the second gear. The first sleeve is connected with a driving device. Ball serving by waving a racket like a real person can be simulated, the ball serving angle, ball serving speed and ball rotating speed can all be changed, and athletes can be effectively helped to improve the ball catching level.
Owner:NANHUA UNIV
Novel material firing-range-variable cannonball equipment for training
InactiveCN108801046AImprove work coordinationIncreased versatilityTraining adaptationEngineeringNew materials
Owner:袁兴芳
A method for querying data in non-fragmentation key fields after sharding databases and tables in a distributed system
ActiveCN112380276BQuickly get query resultsAccurate hitRelational databasesSpecial data processing applicationsShardTable (database)
Owner:SICHUAN XW BANK CO LTD
Turning anchor hook capable of measuring distance
InactiveCN107144180AAccurate hitAccurate lockAmmunition projectilesBows/crossbowsEngineeringObstacle crossing
The invention discloses a turning anchor hook capable of measuring the distance. The turning anchor hook comprises a climbing rope and a crossbow arrow tail rod type anchor hook body; the climbing rope is connected with the crossbow arrow tail rod type anchor hook body, the crossbow arrow tail rod type anchor hook body is provided with a conventional crossbow arrow tail and a rod part, and can be installed on a conventional crossbow arrow shooting device for shooting, and a distance measurement device is arranged on the crossbow arrow tail rod type anchor hook body; the crossbow arrow tail rod type anchor hook body is provided with a wind deflector which is provided with a wind receiving surface, and an elastic clamping hook is arranged at the end, far away from a rotating shaft, of the wind deflector; and the climbing rope is provided with a rope knot and a rope fastener knot or rope sleeve or grabbing hand. By means of the turning anchor hook, difficulties generated during motions such as hunting, climbing holdback crossing of people on field are overcome, the structure is simple, carrying is convenient, the functions are powerful, and the performance is reliable; and the distance between the long handle crossbow arrow and a target is measured through a wireless method, a target object can be hit or entangled accurately, climbing obstacle crossing is facilitated, and a great advance of an outdoor moving device is achieved.
Owner:苏州七巧板日用品科技有限公司
Crossbow structure capable of shooting field climbing rope
InactiveCN107144167AAccurate hitAccurate lockAmmunition projectilesBows/crossbowsRemote controlEngineering
The invention discloses a crossbow structure capable of shooting a field climbing rope. The crossbow structure comprises a conventional handheld crossbow, a rotary redirection remote-control unit, a soft rope special for climbing and a long handle crossbow arrow; the long handle crossbow arrow can be installed on the conventional handheld crossbow and is shot by the conventional handheld crossbow, a hand-operated line winding wheel is additionally installed on the conventional handheld crossbow, and the long handle crossbow arrow is connected with the soft rope special for climbing through the hand-operated line winding wheel; and the long handle crossbow arrow is provided with a side direction rotary redirection rudder and a conventional crossbow arrow handle, the side direction rotary redirection rudder is connected with the long handle crossbow arrow and is provided with an arc-shaped rack, the arc-shaped rack is connected with a driving device, and a rope sleeve is arranged on the soft rope special for climbing. By means of the crossbow structure, difficulties generated during motions such as hunting, climbing holdback crossing of people on field are overcome, the structure is simple, carrying is convenient, the functions are powerful, and the performance is reliable; and the distance between the long handle crossbow arrow and a target is measured through a wireless method, a target object can be hit or entangled accurately, climbing obstacle crossing is facilitated, and a great advance of an outdoor moving device is achieved.
Owner:苏州七巧板日用品科技有限公司
Sound box
InactiveCN110858937APlayback controlAccurate hitFrequency/directions obtaining arrangementsEngineeringAcoustics
The invention relates to a sound box, which comprises a sound box body and a sandbag, an embedding groove is formed in the sandbag; the sound box body is installed in the embedded groove, wherein a first local striking area and a second local striking area are arranged on the surface of the sandbag; pressure sensors are arranged on the inner walls of the first local striking area and the second local striking area; a control module is further embedded in the sandbag; the pressure sensor is connected with the control module; the control module is connected with the sound box body, wherein a plurality of groups of pressure value changing interval time intervals and a plurality of groups of corresponding music are preset in the control module; the pressure sensor collects pressure values andtransmits the pressure values to the control module, and the control module controls the sound box body to play corresponding music when the interval time of the pressure value change is within a preset interval time interval of the pressure value change. The sound box provided by the invention has a pressure relief function, can be used for pressure relief by striking, and can play music in the striking process.
Owner:台山钟神音响科技有限公司
Coin kick control method and device for coin sorting machine
A method and apparatus for coin kicking control, comprising: acquiring the actual transport speed of a coin when the coin reaches a first preset position (S102); determining, on the basis of the actual transport speed, a first interval time from the moment when the transport of the coin starts from a second preset position to the moment when a coin kicking operation is activated (S104), where the second preset position is located downstream to the first preset position in the direction in which the coin is transported, or the second present position is identical to the first preset position; and, starting from the moment when the transport of the coin starts from the second preset position, when the first interval time elapsed, activating the coin kicking operation (S106). The method and apparatus increase the coin kicking accuracy of a coin sorting machine.
Owner:SHANDONG NEW BEIYANG INFORMATION TECH CO LTD
An air cannon test device and test method for accurately hitting the inner position of a narrow space
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Robot-assisted system and method for controlling flexible needle to puncture soft tissues in real time
InactiveCN102018575BReal-time adjustmentAccurate hitDiagnosticsSurgical navigation systemsMedical equipmentData acquisition
The invention provides a robot-assisted system and method for controlling a flexible needle to puncture soft tissues in real time, belonging to the technical field of medical equipment for minimally invasion surgeries (MIS). The system comprises a flexible needle puncture device, a driving device, a mechanical sensor, a data acquisition card and a computer, wherein the computer comprises steppingmotor movement control software, force signal processing software and a flexible needle control algorithm. The method is used for realizing needle puncture movement through the following steps: regarding puncture process as a quasi-static process and any needle section as a cantilever, wherein each needle section is described by vector and is regarded as a cantilever; computing the deflection andcross section rotating angle of the needle section according to the theory of cantilever; and computing the positions of the needle body and the needle point in real time by iteration. According to the invention, real-time adjustment of the position of the needle body in the process of puncture is realized, thus effectively keeping away from the barriers in the process of puncture and precisely hitting the target; and further the degree of fatigue of the doctors is reduced, pains of the patients are alleviated, and the surgery risks are reduced.
Owner:TSINGHUA UNIV
Long-range guided aircraft with full range coverage
The invention discloses a remote guidance aircraft capable of achieving full-range coverage, and the aircraft can strike a long-range target, a medium-range target and a short-range target and has important engineering significance. Specifically, the remote guidance aircraft comprises a decision module and a central processing module; the decision module is used for selecting a corresponding guidance start control module for executing operation according to the range information before launching; different guidance start control modules can control different component modules to start work, sothat the corresponding component modules are controlled based on different ranges; and the central processing module generates a rudder deviation instruction by receiving information transmitted by the component modules and controls the aircraft to fly to a target.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1
A safety monitoring method for embankments based on adaptive feedback vibrating wire sensors
InactiveCN104729542BImprove work efficiencyShorten the timeConverting sensor output electrically/magneticallySTM32Type frequency
The invention discloses a dam safety monitoring method based on an adaptive feedback vibrating wire sensor. The initial resonance frequency is used as the initial excitation frequency, and the total number of pulses Nf required for the minimum vibration of the steel string is used to adaptively adjust the excitation time; the interrupt counter of the STM32 processor and the double-trigger method of the timeout timer are used to determine the end of the vibration pickup. The pickup time is counted, and the pickup frequency is calculated according to the equal-precision frequency measurement method; the concept of frequency difference state Sf is introduced, the difference between the pickup frequency and the excitation frequency is calculated, and the state of Sf is determined. When Sf is in an ideal state, the vibration pickup frequency is the resonant frequency; when Sf is in a non-ideal state, update the excitation frequency according to f=f±fdeta, and re-excite the vibration. The invention reduces the single excitation time and improves the efficiency of dam safety monitoring; adopts a feedback-based frequency sweep method to realize equal-precision self-adaptive adjustment, and shortens the time for dam safety monitoring.
Owner:EAST CHINA JIAOTONG UNIVERSITY
Anti-lost satellite remote guidance aircraft with full range coverage
ActiveCN111377064BAccurate hitProvide quicklyCosmonautic vehiclesSpacecraft guiding apparatusFlight vehicleControl engineering
The invention discloses an anti-lost satellite long-range guidance aircraft with full-range coverage, which can achieve strikes on long-range targets, medium-range targets and short-range targets, and can not lose control in the case of staged star loss. Important engineering significance, specifically, the remote guided aircraft includes a decision-making module and a central processing module, and the decision-making module is used to select a guidance and control module to perform work according to the range information before launch; different guidance and control modules can control Different component modules start to work, so as to control the corresponding component modules due to different ranges. The central processing module generates rudder deviation instructions by receiving the information transmitted by the component modules, and controls the aircraft to fly to the target. There is a quasi-satellite guidance solver module that can fit the satellite signal when the star is lost, so as to ensure that the aircraft does not lose control when the star is lost.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
A virtual table tennis player hitting training method based on reinforcement learning
ActiveCN110496377BAccurate hitReasonable hitting actionRacket sportsHuman bodyComputer graphics (images)
The invention discloses a virtual table tennis ball player hitting training method based on reinforcement learning. The method comprises the following steps of 1) designing a task scene and a task flow; 2) training a ball hitting strategy of a ball bat by using the reinforcement learning method; 3) estimating a motion condition of each joint during ball hitting of a human body by using an inversekinematics algorithm; and 4) training a movement strategy of a root node through the reinforcement learning. According to the method, a virtual ball player who can carry out ball hitting with a reasonable posture and high accuracy can be obtained by designing a simple reward function without training data; complicated ball hitting rules do not need to be designed; meanwhile, due to the low-consumption characteristic of the forward operation of the reinforcement learning, a ball hitting action of the virtual ball player can keep the high frame rate stably, and a user has good interactive experience.
Owner:SOUTH CHINA UNIV OF TECH
Hardware convenient positioning hammer
InactiveCN105643568BIncrease frictionIncrease elasticityDispensing apparatusPortable percussive toolsEngineeringControl switch
The invention relates to a convenient and fast hardware positioning hammer. The convenient and fast hardware positioning hammer comprises two parts, namely a hammer body and a positioning barrel; the hammer body comprises a hammer head and a hammer handle; a hammering plate made of ferromagnetic materials is fixed to the bottom of the hammer head, and an electromagnetic column is installed inside the hammer body; the electromagnetic column is electrically connected with an energy storage power source, and a control switch is further in series connection between the electromagnetic column and the energy storage power source; the positioning barrel comprises two barrel halves, and the two barrel halves can be spliced into the complete barrel through hasps; the barrel halves comprise an air cylinder and a piston column, and the piston column can slide freely along the inner wall of the air cylinder; a vent hole is formed in the bottom of the air cylinder; a permanent magnetic piece is fixedly installed at the top of the piston column; a rubber pad is further attached to the side wall of the air cylinder. When the convenient and fast hardware positioning hammer is used, the hammer head can hit a nail accurately, and the accidental injury probability is effectively lowered; meanwhile, the nail is effectively prevented from bursting out, and therefore the convenient and fast hardware positioning hammer is safer and more reliable to use.
Owner:南通荣茂电子科技有限公司
A table tennis training table
InactiveCN109289175BAdjust drop pointIncrease catchCard tablesTable tennis tablesPhysical medicine and rehabilitationGear wheel
A table tennis training table comprises a body of the table tennis training table. The body is composed of a tabletop, a partition net and four table legs. A vertical polished shaft is arranged at theleft end of the body. The polished shaft is fixedly connected with the table legs on the front side of the left end of the body through a support. The polished shaft is sleeved with a first sleeve and a second sleeve. The upper end of the first sleeve is movably connected with the lower end of the second sleeve through a bearing. A vertical guide groove is formed in the side face of the polishedshaft. A guide block is fixedly installed on the inner wall of the first sleeve. The guide block is inserted in the guide groove. A vertical first servo motor is fixedly installed on one side of the first sleeve. A first gear is fixedly installed on an output shaft of the first servo motor. The lower end of the second sleeve is fixedly sleeved with a second gear. The first gear is meshed and matched with the second gear. The first sleeve is connected with a driving device. Ball serving by waving a racket like a real person can be simulated, the ball serving angle, ball serving speed and ball rotating speed can all be changed, and athletes can be effectively helped to improve the ball catching level.
Owner:NANHUA UNIV
Cartridge with sharkskin-structure surface texture
The invention discloses a cartridge with sharkskin-structure surface texture. The cartridge consists of a cartridge case, a primer, a propellant powder and a cartridge head, and is characterized in that the surface texture of the cartridge head simulates the V-shaped wrinkles at the sharkskin surface; one circle of densely-arranged sharkskin-simulated V-shaped wrinkle unit uses the area near the top part of the cartridge head as the starting point, and is arranged down along one direction until to the bottom part of the cartridge head; when the cartridge head is ejected out, the air drag can be reduced by the sharkskin-simulated V-shaped wrinkles, and the cartridge head can more accurately hit the target. The cartridge has the beneficial effects that the air drag can be reduced, and the cartridge head can more accurately hit the target.
Owner:邬惠林
vehicle weapon bay
The invention provides a highly flexible vehicle-mounted weapon support with which soldiers do not need to lean out of a vehicle body and can attack enemies in air conveniently. The vehicle-mounted weapon support comprises a shell which is provided with a vehicle body connecting disc and is characterized in that a rotating sleeve connected with a first rotating device is arranged in the shell, and a rotating rod connected with a second rotating device is arranged in the rotating sleeve; a lifting worm is arranged at the upper part of the rotating rod; a lifting worm gear matched with the lifting worm is arranged on the rotating sleeve and is connected with a weapon platform.
Owner:SHENYANG LUSHENG MACHINERY
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