125 results about "Swimming speed" patented technology

The invention discloses a method for evaluating the swimming ability of fishes and application of the method in the fish passage facility design. The method comprises the steps that (1) fishes are selected as a target; (2) a test water channel is selected; (3) the sensing flow velocities of the fishes are tested, wherein the total length index, the body length index and the weight index of each fish are recorded, and temporary rearing continues; (4) the critical swimming speeds of the fishes are tested; (5) the onrush swimming speeds of the fishes are tested, wherein the total length index, the body length index and the weight index of each fish are recorded, and the onrush swimming speeds of the fishes are calculated; (6) repeated testing is carried out; (7) statistics is carried out on swimming speed test results, wherein the median of the sensing flow velocities, obtained through repeated testing, of the target fishes, the median of the critical swimming speeds, obtained through repeated testing, of the target fishes, and the median of the onrush swimming speeds, obtained through repeated testing, of the target fishes are calculated; (8) the range of the continuing swimming speeds, the range of durable swimming speeds and the range of the outburst swimming speeds are obtained in a short time, comprehensive evaluation is carried out on the swimming speeds of the fishes, and the maximum flow velocity of a main body structure, the fish luring flow velocity of an inlet, and the range of the flow velocities of an outlet in the fish passage facility design are determined.

The invention provides a wild training method and a wild training device for improving swimming capacity of released Yangtze sturgeons. The method includes: 1, preparation is carried out before an experiment; 2, adjustment and testing of water flows are carried out; 3, experiment sturgeons are introduced; 4, water flow training of the Yangtze sturgeons is carried out; and 5, finish time of the water flow training is carried out. According to the device, a river diversion screen and a submerged pump are installed in the middle of a cultivation bucket. A frequency converting controller is connected with the submerged pump through a wire, a water outlet of the submerged pump is connected with conduits, flow jetting holes are formed in the conduits, a water outlet pipe is installed in the middle of the cultivation bucket and has water level adjustment, and a water inlet pipe is connected on the upper portion of the cultivation bucket. By adoption of the training method, after the Yangtze sturgeons at different stages are trained, swimming capacities are all obviously improved. After training, water flow sensory capacities of the Yangtze sturgeons are improved, limiting swimming speed is high, and continuous swimming time in high-speed water flows is long.

The invention discloses an underwater fry, young shrimp and young crab quantity estimating and behavior monitoring device and method based on computer vision. The device is characterized in that the device comprises a two-way winch, a motor, a floater and a video collecting device, wherein the two-way winch and the motor are used for driving the video collecting device to carry out all-dimensional and different-water-level sampling in a nursery pond, the floater is used for bearing the motor, and the video collecting device is used for collecting young videos of fry, young shrimps and young crabs. The method comprises the following steps that the video collecting device is arranged in water and is respectively driven by the two-way winch and the motor to collect the videos of the fry, the young shrimps and the young crabs in the nursery pond, and the quantity and the density of the fry, the young shrimps and the young crabs in the whole nursery pond are estimated by using an image processing technology according to collected fry, young shrimp and young crab images of different water levels and different dimensions; a light inducing light source is turned on, and the shot videos are used in the image processing technology to calculate the swimming speed of targets and a cluster center coordinate to reflect the moving capability and light inducing capability of the fry, the young shrimps and the young crabs. The underwater fry, young shrimp and young crab quantity estimating and behavior monitoring device has the advantages of being simple in structure, wide in monitoring range, convenient to use and high in accuracy, and is suitable for biological quantity estimation and behavior monitoring on the nursing state of automated aquaculture.

The invention belongs to the technical field of bionic robots and particularly relates to a bionic robotic fish. The bionic robotic fish aims at solving the problems that in the prior art, the swimming performance of a bionic robotic fish is not sufficient, and high-speed swimming, low-speed maneuvering and good stability cannot be taken into consideration. The bionic robotic fish comprises a bodycabin module, a tail cabin module, a tail fin and pectoral fin modules symmetrically distributed on the left side and the right side of the body cabin module, wherein the body cabin module, the tailcabin module, the tail fin and the pectoral fin modules are independently sealed. The tail cabin module and the tail fin are sequentially hinged to the rear portion of the body cabin module. By meansof the bionic robotic fish, due to the combination motion of the tail cabin module and the tail fin, fish imitating BCF mode propelling is achieved, and fish imitating MPF mode propelling is achievedthrough pectoral fin fluctuation. The bionic robotic fish integrates the advantages of the BCF mode and the MPF mode, and the high swimming speed and high maneuvering of the BCF mode and low-speed maneuvering and stable swimming of the MPF mode can be achieved. According to an intelligent control method based on reinforcement learning, different work modes are selected automatically for adapting to different underwater environments and meeting different task requirements, and wide application prospects are achieved.

The invention discloses a two-joint robotic fish driven by a single motor. The two-joint robotic fish comprises a C-shaped aluminum head, a control room and a push mechanism. The control room comprises a main control board, a lithium battery pack, a motor drive module, a direct current motor and a wireless communication module. The push mechanism comprises a first joint, a second joint, a Z-shaped connecting rod, an eccentric wheel, a sliding groove and a tail fin. The drive motor drives the eccentric wheel to rotate in a single direction, and through the position cooperative relationship between the first joint and the second joint, the high-speed swimming characteristic of the robotic fish is achieved. In addition, steering control over the biotic robotic fish is achieved through asymmetric rapid forward and reverse rotation of the motor. The biotic robotic fish is low in weight, small in size and simple in structural design, and the high swimming speed and the high maneuverability of the robotic fish can be achieved.

There is provided an auditory feedback swim training device for use by a swimmer. The device includes a flow meter connectable to the swimmer and configured to measure a flow rate of fluid while the swimmer is swimming. A control unit determines a speed or distance of the swimmer from the measured flow rate. A selection tool is in operative communication with the control unit and configured to receive a user input corresponding to desired swimming performance data. An auditory feedback device is wearable by the swimmer while swimming and in operative communication with the control unit. The control unit is configured to derive the desired swimming performance data from the determined speed of the swimmer and generate a feedback signal corresponding to the derived swimming performance data. The auditory playback device is configured to project an audible signal corresponding to the feedback signal while the swimmer is swimming.

The invention discloses a water pollution monitoring and early warning device based on fish behaviors, and an early warning method of the water pollution monitoring and early warning device based on the fish behaviors. The early warning device comprises an experiment reaction box and a control device, wherein the experiment reaction box is provided with a biological early warning unit and a waterquality checking unit in the water flow direction in sequence, and the biological early warning unit is separated from the water quality checking unit through a water blockage device; the control device comprising a central processing unit and a collection unit connected with the central processing unit, the collection unit is composed of a fin sensor, a CCD camera, a photoelectric sensor and an impacting sensor, the collection unit transmits a collected data signal to the central processing unit, and the central processing unit contrasts the collected average swimming speed, average turning frequency, average activity water depth and total impacting frequency of fishes in the biological early warning unit with a constructed fish behavior reaction-water pollution degree black-box model, and therefore the degree of water pollution is judged quantitatively.

The invention discloses a mechanical underwater manual propeller, which comprises a screw propeller mounted on a screw propeller shaft. A first bevel gear is disposed at the rear of the screw propeller, a protecting ring which is concentric with the screw propeller is arranged on the outside of the screw propeller, a supporting plate is disposed on one side of the protecting ring, a first gear and a second gear which are meshed mutually are disposed on the supporting plate, a transitional gear is further arranged on the supporting plate, the transitional gear and the second gear form a meshing pair, a transmission shaft of the transitional gear penetrates through the supporting plate, a second bevel gear is disposed at an end, which his located in the protecting ring, of the transmission shaft, the first gear is connected with a first connecting rod, the second gear is connected with a second connecting rod, and a one-way flywheel is disposed on the screw propeller shaft. The mechanical underwater manual propeller can high-efficiently convert power of a human body into advancing power as far as possible by the aid of a mechanical transmission principle, and high swimming speed can be obtained without high physical power consumption.

This invention belongs to automatic engineering technique field and relates to a basic method to realize the double-direction swim of micro robot in sealed tube through magnetic field driving. It provides a double-direction driving model with robot head and tail which have two resonance frequency driver thin films according to push characteristics of vibration thin film and liquid couple and thin film each phase of resonance frequency relation characteristics. It generates drive magnetic field through Helmholtz double coil driving between two resonance frequency of the front and back thin film driver to realize the continuous adjusting and position control of the robot swimming speed.

The invention discloses a robotic fish with power fins and a method for realizing swimming action. The power fins are mainly symmetrically arranged on two sides of the middle of an existing robotic fish and each comprises a power driving mechanism and a power fin wing, wherein the power driving mechanism is arranged in a casing of the robotic fish and comprises a fixed platform, a steering engine support, a power fin steering engine, a hermetic driving device and a connecting mechanism. The power fin steering engines drive rocker rods of the connecting rod mechanisms to swing, and the rocker rods drive the power fin wings to swing, so that high swimming-forward power can be generated for the robotic fish. By skillful mechanical structure, the power fin wings can swing back and forth at different speeds and fin vanes can be opened and closed on the premise of keeping a steering engine constant in steering direction, and thereby the robotic fish can swim forwards, and purposes of high swimming speed and efficiency, low noise and no weed winding are achieved.

The invention discloses swimming clothes according to artificial elementary, which is characterized by the following: adopting elastic fiber material to weave feather-flap textile as material for swimming clothes; emulating arrangement strike like bird feather and fish flap; tightening body to possess huge thrash force; overcoming recall; improving swimming speed.

The invention relates to a bionic robotic fish jointly driven by a driving joint and a driven joint and belongs to the technical field of bionic-propelling underwater robots. The bionic robotic fish comprises a sealed bin and a tail fin propeller, various load parts are accommodated in the sealed bin, the tail fin propeller is provided with a two-degree-of-freedom swing arm structure, a main motor drives a swing arm to horizontally move on the water level by a bevel gear, the tail end of the swing arm is connected with a tail handle and a tail fin through a hinge, and the front end of the tail handle is connected with an extension spring. When the swing arm flaps from left to right, the tail fin can passively rotate under the coaction of the extension spring and a fluid field. A reel is mounted on an output shaft of an adjusting motor, a steel wire connected with the extension spring is wound on the reel, the adjusting motor can rotate to change pretension of the extension spring, and rigidity of the driven joint can be changed thereby. By means of elastic components, cyclic utilization of mechanical energy can be realized, inherent frequency of a mechanical system corresponding to different swimming speeds can be obtained by adjusting the driven joint, and self-adaptive efficient swimming is realized.

An apparatus and method for measuring a swimmer's speed and conveying the speed to the swimmer in real time includes a plurality of ultrasonic beacons each having a transducer configured to emit ultrasonic signals in a pool or other body of water within which the swimmer is swimming. A wearable, waterproof, ultrasonic receiver worn by the swimmer, receives the ultrasonic signals and generates corresponding signal data. The receiver's microcontroller captures and uses the signal data to calculate the swimmer's position and speed in real time, and conveys this information to a wearable, waterproof, user interface device worn by the swimmer, the user interface device including a near-eye display disposed on the swimmer's googles.

The invention discloses a wave flow velocity measuring system based on laser doppler speed measurement, a water tunnel type swimming machine system and a speed correcting method, capable of accuratelymeasuring the wave water flow speed and speed distribution, providing a reliable basis for calibrating the swimming speed of a swimming machine and evaluating the performance of the swimming machine.The wave flow velocity measuring system comprises a power box, a main flow area, and backflow pipelines divided into two paths. The front ends of a light receiving / emitting unit is provided with a light guide pipe with a sealing window, and the light guide pipe penetrates through the wave water surface, the laser beam is irradiated to the main flow area to form a measuring body, and the scatteredlight of the measuring body can be received, and the LDV flow velocity measurement is realized. A measurement body reflector converts the backward scattered light into forward scattered light, and the intensity of the received scattered light is greatly improved. A small-power semiconductor laser is adopted, particles do not need to be added manually, and a good signal-to-noise ratio can be obtained. The system can be used for a flow velocity measurement occasion with a wave free surface, such as a large-scale wave groove, a water tunnel type swimming machine, a ship navigation speed and thelike, and high far advanced technology than other flow velocity measuring technology.

The invention relates to a system and a method for observing underwater organisms. The system comprises a light curtain scanning array, an image acquisition system, a central area channel, a control module, a data processing module and an output module. The method comprises the steps of: obtaining lateral and vertical continuous width data of fish, calculating the swimming speed of the fish, obtaining lateral and vertical contour information of the fish, collecting image information of the fish, identifying the types and quality data of the fish, obtaining shape and form feature information ofthe fish, and forming three-dimensional images of the fish. According to the invention, the influence on the normal activity of the fish can be avoided, the visual blind area is eliminated, and the observation result has integrity, objectivity and scientificity.

The invention discloses a monitoring identification method for swimming information based on a wearable intelligent device. The method comprises the following steps: A) collecting standard data of swimming, thereby acquiring signal feature diagrams of various swimming strokes; B) selecting acceleration magnitudes of y axis and z axis for distinguishing the swimming strokes; C) filtering fault motions, setting a threshold value, removing fault motion interference, confirming the data as being valid if the value exceeds the threshold value, and then performing low-pass filtering and feature extraction identification operation; and D) designing a filter, performing low-pass filtering and filtering high-frequency noise and harmonic wave, thereby acquiring a swimming base frequency signal. After the method is adopted, a swimming index is acquired through statistic analysis; the monitoring method is reasonable, the calculated amount is low and the occupied memory space is less; the swimming stroke and swimming related parameters (arm pulling times, swimming distance, swimming time, swimming speed, and the like) can be accurately confirmed and identified; the monitoring identification data are accurate; and the method has higher practicability for the embedded wearable intelligent device.

The invention belongs to the field of ecological environmental protection tests of water conservancy projects, and provides a method for measuring fish critical swimming speed. The method for measuring the fish critical swimming speed is specially adopted in the construction process of an ecological fishway. The method comprises the steps of the preparation of fish swimming measuring devices, arrangement of the fish swimming measuring devices in a test section, the testing process of fish critical swimming speed and statistics of test data. The method for measuring the fish critical swimming speed achieves testing of the critical swimming speed of small fishes such as cobitidae, and the small fishes such as the cobitidae can be helped to pass through the fishway after the speed measured by the method is adopted in design of the ecological fishway.

The invention discloses a jellyfish robot. The jellyfish robot comprises an upper chamber, a lower chamber, a driving mechanism, a left water spraying mechanism and a right water spraying mechanism, wherein the upper chamber is provided with an outer casing, an inner casing and a sealing plate; a first sealing cavity is defined by the outer casing, the inner casing and the sealing plate, a second sealing cavity is defined by the interior of the inner casing and the sealing plate, a first water inlet mechanism is arranged on the outer casing, and a second water inlet mechanism is arranged on the inner casing; the lower chamber comprises a cylinder, the top part of the cylinder is connected with the lower surface of the sealing plate in a sealing way, the left side and right side of the cylinder are symmetrically provided with a left boosting cavity and a right boosting cavity, boosters are arranged in the left boosting cavity and the right boosting cavity, and the left boosting cavity and the right boosting cavity are respectively communicated with the second sealing cavity; the driving mechanism is connected with the first water inlet mechanism, and is used for driving the first water inlet mechanism to do reciprocating movement; the left water spraying mechanismand the right water spraying mechanism are arranged at the bottom part of the lower chamber. The jellyfish robot has the advantages that the swimming speed is high, the stability is good, and the running attitude of the robot is more simply and conveniently controlled.

The invention relates to a bionic swimming propeller and a swimming propelling method, and belongs to the technical field of swimming equipment and swimming propelling methods. According to the technical scheme, a plurality of longitudinal grooves (8) are formed in the surface of a base body (1), and corresponding shaft holes are formed on the inner walls on the two sides of each groove; a pull rod (3) is arranged in each groove, is embedded in the groove and slides up and down in the groove, one end of each pull rod penetrates out of the upper portion of the base body and is sleeved with a spring (5), and each pull rod is provided with a plurality of transverse grooves (6); a connecting shaft (7) is arranged on each scale (2) and located above the corresponding groove in the corresponding pull rod, and the two ends of each connecting shaft are clamped in the shaft holes in the corresponding groove of the base body; a bottom ring (4) is arranged below the base body and matched with the base body in shape. The bionic swimming propeller simulates the structure of scales and is simple in structure, convenient to use and practical, the bionic swimming propeller is tied to the crus when a user swims, and the scales are opened when the user drives the legs, so that the action area between the crus and water is increased; the scales are closed when the user withdraws the legs, so that advance resistance is reduced, and then swimming speed is increased.

The invention discloses a manta ray-imitating underwater soft robot based on a liquid dielectric medium driver, and belongs to the field of soft robots. The soft robot comprises an integrated flexible robot body shell, an internal trunk frame, a left pectoral fin driving module, a right pectoral fin driving module, a circuit module and a tail fin driving module; the integrated flexible robot body shell wraps the interior trunk frame and all the modules and serves as a shell of the whole soft robot; the left pectoral fin driving module and the right pectoral fin driving module are symmetrically hinged to the two sides of the internal trunk frame, the tail fin driving module is hinged to the tail of the internal trunk frame, and the circuit module is installed on the internal trunk frame; and the pectoral fin driving modules drive the fin ray to flutter up and down through the contraction motion of the liquid dielectric media on the two sides of the fin ray. The underwater robot is higher in swimming speed, larger in designable maximum displacement, higher in carrying capacity and capable of completing more kinds of work tasks.

The invention provides a variable-stiffness flexible bionic fish model based on internal fluid pressure adjustment. The model comprises a fish head portion, a fish body and a tail fin. A pneumatic power control unit is installed in the fish head portion. The fish body comprises four internal taper pneumatic muscles and a nested series-parallel unit. The nested series-parallel unit is taken as a spine and a skeleton of a bionic fish. The four internal taper pneumatic muscles are located in the nested series-parallel unit respectively. A front end of each internal taper pneumatic muscle is connected to the fish head portion, and a tail end is connected to the tail fin through a rigid fixing component. The pneumatic power control unit is connected to the nested series-parallel unit and the four internal taper pneumatic muscles respectively. The pneumatic power control unit adjusts an internal intensity of pressure of the internal taper pneumatic muscles so as to realize fish body swinging and torsion or changes an average intensity of pressure so that rigidity of a tail portion of the fish body changes. The model is flexible, according to a swimming speed, tail portion rigidity can be adjusted and the model is energy-saving and high-efficient.

The invention relates to an estimation system of a factory-like circulating water cultured fish space and an estimation method of the factory-like circulating water cultured fish space. The calculation system includes a near infrared camera, a near infrared light source and a processing device, wherein the near infrared camera and the near infrared light source are arranged at the upper part of a fish pond; optical axis rays of the near infrared light source are arranged at the upper part are perpendicular to the water face of the fish pond, and connected with the processing device; the infrared light source is used for supplementing light for the near infrared camera under the control of the processing device; the infrared camera is used for collecting a near infrared image of fishes under the control of the processing device; the processing device is further used for receiving the near infrared image to process and obtain the fish swimming speed. The estimation method is used for calculating the fish swimming speed. The calculation system can be applied to the factory-like circulating water cultured fish space with dark light; the growth environment of fishes is not changed, thus the growth is not influenced. The calculation system can monitor the swimming speed of fishes in real time and provide reliable basis for monitoring fish behaviors.

The invention discloses an intelligent swimming pool, which comprises a water circulation system, a reverse flow dynamic keeping system and a position dynamic keeping system. The water circulation system forms a circulating water flow in the swimming pool to provide water flow resistance for a user during swimming; the reverse flow dynamic keeping system adjusts the direction of the water flow inthe swimming pool to enable the direction of the water flow in the swimming pool to be opposite to the swimming direction of the user, so that the user keeps swimming in the reverse flow all the time;and the position dynamic keeping system adjusts the speed of the water flow in the swimming pool to enable the speed of the water flow in the swimming pool to be equal or approximate to the swimmingspeed of the user, and the user stands still or is limited to move within a certain interval range. To sum up, the flowing speed and the flowing direction can be adjusted continuously and automatically according to the swimming speed and posture of the user, various intelligent control functions are achieved, the problem that a site of the swimming pool is limited is effectively solved, and the user obtains the better swimming experience.

The invention discloses a numerical simulation method for high-density cultured fish schools in deep sea net cages, and the method comprises the steps: adopting a rigid body fish model to simulate cultured fish schools, wherein a rigid body fish comprises a fish body and a fish tail; applying a drag force and a lift force respectively to the fish body and the fish tail to simulate the influence ofhigh-density fish schools on flow fields and deformation around the net cages; adopting a k-omegaSST turbulence model to simulate flow fields around the net cage and the high-density cultured fish schools, adopting a nonlinear structure finite element model to calculate structural deformation of the net cage, and finally achieving the numerical simulation of the influence of the high-density cultured fish schools on the flow fields around the net cage and deformation. By adopting the method, the flow field and structural deformation around the net cage under different cultured fish swarm distribution modes, culture densities, swimming speeds and accelerations can be calculated. The model solves the problem of numerical simulation of high-density cultured fish schools in the deep sea net cage, can be well used for dynamic response analysis of the actual net cage, and provides support for structural design of the deep sea net cage.

The invention relates to the technical field of hydrological exploration, and discloses an underwater patrol robotic fish which comprises a robotic fish body, a power tail fin assembly is embedded in the rear end of the robotic fish body, a snorkeling device is installed at the position, close to the rear side of an ultrasonic detector, of the lower end of the robotic fish body, and propellers are installed on the rear sides of the two ends of the robotic fish body. The speed of the robotic fish in water can be controlled through the propeller and the power tail fin assembly, so that the robotic fish has the high swimming speed, meanwhile, the power tail fin assembly can adjust the balance of the robotic fish, steering or turning around of the robotic fish can be achieved by adjusting the angle between the propeller and the robotic fish body, and the robotic fish has flexible maneuverability; by adjusting the angles of the blades in the adjustable paddles, the angles of the blades adapt to the current water flow direction, the current water flow speed and the speed direction of the robotic fish, the robotic fish can have the optimal motion state, and high practicability is achieved.

The invention discloses a bionic robotic fish based on bionic fin and pump combined propulsion, which is used for oil-immersed transformer internal inspection. The bionic robotic fish comprises a headsection shell, a middle section shell and a tail section shell which are connected in sequence, wherein the head section shell is provided with an inspection camera, the two sides of the head sectionshell are symmetrically provided with two-degree-of-freedom bionic fin mechanisms respectively, the middle section is a sinking and floating control mechanism, the upper end of the sinking and floating control mechanism is provided with a balance control rudder bin, and the rear end of the tail section shell is provided with a pump type propeller. According to the two-degree-of-freedom bionic finmechanism, various complex combined motion modes such as advancing, retreating, ascending, diving and turning can be conveniently achieved, thereby being closer to the swimming state of a real fish,improving the swimming speed and maneuverability of the bionic fish at the same time, and improving he adaptability of the bionic fish to the narrow space.

The invention discloses a testing method for onrush swimming speed of fishes. The method comprises the following steps: arranging a fish swimming testing device; arranging a testing section of the fish swimming testing device; testing the onrush swimming speed of the fishes; counting test data. The invention particularly discloses a method for testing the swimming speed of the fishes adopted in an ecological fishway establishment process, and belongs to the field of ecological environment protection testing in water conservancy projects. According to the testing method for the onrush swimming speed of the fishes provided by the invention, the problem of testing of the onrush swimming speed of echeneis naucrates is solved; the speed tested by the method can help the echeneis naucrates to pass through an ecological fishway after being adopted in the design of the ecological fishway.

The invention belongs to the technical field of robots, and aims to solve the problem of high energy consumption and slow swimming speed of a fish-shaped robot. The invention provides a tuna robot. The tuna robot comprises a shell and a power device, wherein a part of the power device is arranged in the shell; the power device comprises a fixed component, a floating-sinking mechanism, a pitching mechanism and a swinging mechanism; the fixed component is arranged in the shell; the floating-sinking mechanism, the pitching mechanism and the swinging mechanism are arranged on the fixed component;the floating-sinking mechanism can be used for controlling floating, sinking and hovering of the tuna robot; the pitching mechanism can be used for controlling pitching motion of the tuna robot and stopping the pitching motion; the swinging mechanism can be used for controlling march of the tuna robot; the pitching mechanism and the swinging mechanism can simultaneously control steering of the tuna robot. Through arrangement, energy consumption caused by connecting various driving mechanisms is avoided, and the driving efficiency of the various driving mechanisms is improved. Therefore, the motion speed and the motion flexibility of the tuna robot are improved.

The invention relates to a method for detecting swimming speed and a system thereof. The system comprises one or multiple RFID readers which are installed on swimming lane ropes of a swimming pool, an RFID tag which is bound on a human body, wireless data transmission modules which are connected with the RFID readers, and a remote calculating terminal. The RFID readers acquire an identification code of the RFID tag, and the identification code of the RFID tag and time at which the RFID tag is detected are transmitted to the remote calculating terminal via the wireless data transmission modules. A time interval between the time at which the RFID tag is detected for the first time and the time at which the RFID tag is detected for the second time is calculated by the remote calculating terminal. Then according to the moved distance of the RFID tag in the process from the first time of detection of the RFID tag to the second time of detection of the RFID tag, average speed of the human body in movement of the aforementioned process is calculated.

The invention discloses a swimming training auxiliary system. The swimming training auxiliary system comprises a host, a display screen, an overlooking camera, a side-looking water surface camera anda side-looking underwater camera, the overlooking camera, the side-looking water surface camera and the side-looking underwater camera are electrically connected with the input end of the host in a wired or wireless mode, and the output end of the host is electrically connected with the display screen. According to the swimming training auxiliary system, the action process of a swimmer can be tracked and shot at multiple angles, shot pictures are synthesized and then played to the swimmer, and the swimming speed is measured in real time. The whole process is automatically completed, and manualoperation is not needed. By using the swimming training auxiliary system, the swimmer can be helped to intuitively recognize detail errors of the action of the swimmer, communication between sportsmen and coaches is facilitated, the action leaning cycle is shortened, and the training efficiency is improved.