59 results about "Force platform" patented technology

The utility model relates to the technical field of sensors, and discloses an integrated compliant branch type six-dimensional force sensor structure based on a Stewart mechanism, a sensor body structure comprises an upper force transmission platform, six compliant branch mechanisms and a lower force transmission platform, the six compliant branch mechanisms are uniformly connected to the upper force transmission platform and the lower force transmission platform according to a specific angle, the flexible branch mechanism comprises a flexible structure I, a flexible structure II and a flexible connecting piece, is an equivalent two-force rod formed by five rotational degrees of freedom and one translational degree of freedom, and meets the characteristic requirements of a two-force rod branch of a Stewart six-dimensional force sensor; according to the utility model, on the basis that the characteristics of easy solution of a force mapping relation and flexible structure of the assembly type Stewart six-dimensional force sensor are maintained, the problems of high assembly difficulty, insufficient structure bearing, time and labor waste, zero crossing, hysteresis and the like of the conventional assembly type Stewart six-dimensional force sensor are solved, and the engineering practicability of the Stewart six-dimensional force sensor is improved.

The invention discloses a pedestrian bridge vibration comfort evaluation platform considering human-bridge interaction. The pedestrian bridge vibration comfort evaluation platform comprises a self-energized sensing vibration force measurement platform and an analysis control system, the self-energized sensing vibration force measuring platform comprises a plurality of self-energized sensing force measuring tables and a servo control motor; friction nanometer generator self-powered three-way force measuring blocks are densely distributed on the self-powered sensing force measuring table; the analysis control system comprises a data acquisition module, a feedback control module and a data output module, acquires a three-dimensional pedestrian load on the self-energized sensing vibration force measuring platform in real time, calculates bridge dynamic response based on a pedestrian bridge finite element model, and further feeds back and controls the vibration state of the self-energized sensing vibration force measuring platform to simulate the actual vibration condition of the bridge; and finally, evaluating the vibration comfort of the bridge according to the dynamic response characteristics of the bridge in the whole loading process. According to the invention, real-time interaction between the computer end and the self-energized sensing vibration force-measuring platform is realized, sensing energy consumption is reduced, and a pedestrian bridge vibration comfort assessment result closer to a real situation is obtained.

The invention discloses an assembly type decoupling six-dimensional force measuring platform. The force measuring platform comprises an upper elastic force measuring body, a lower elastic force measuring body, an elastic column and an elastic motion branch chain. The upper elastic force measuring body comprises an upper center block, a vertical double-connecting-hole structure, an elastic beam and an angle block, the lower elastic force measuring body comprises a lower center block and a horizontal double-connecting-hole structure, the upper center block and the lower center block are connected through an elastic column, one end of the vertical double-connecting-hole structure is connected with the upper center block, and the other end of the vertical double-connecting-hole structure is connected with the angle block through the elastic beam. One end of the horizontal double-connecting-hole structure is connected with the end block of the lower center block, the other end of the horizontal double-connecting-hole structure is connected with the angle block through the elastic movement branch chain, and the vertical double-connecting-hole structure and the horizontal double-connecting-hole structure are both provided with strain gauges. According to the invention, detection and sensing of forces and moments in three orthogonal directions can be realized at the same time, coupling crosstalk among components is avoided, the difficulty of a decoupling algorithm is effectively reduced, and the method is suitable for application occasions of gait force sensing of humanoid and wheel-foot robots, biomechanical test platforms, high-end manufacturing equipment and the like.

The present invention discloses a pedestrian bridge vibration comfort assessment platform that takes into account human-bridge interaction. The platform comprises a self-powered sensing vibration force measurement platform and an analysis and control system. The self-powered sensing vibration force measurement platform includes multiple self-powered sensing force platforms and servo-controlled motors. The self-powered sensing force platforms are densely packed with friction nanogenerator self-powered three-dimensional force measurement blocks. The analysis and control system comprises three modules: data acquisition, feedback control, and data output. The modules collect the three-dimensional pedestrian load on the self-powered sensing vibration force measurement platform in real time, calculate the bridge dynamic response based on a finite element model of the pedestrian bridge, and then feedback-control the vibration state of the self-powered sensing vibration force measurement platform to simulate the actual bridge vibration. Finally, the bridge vibration comfort is assessed based on the dynamic response characteristics of the bridge throughout the loading process. The present invention enables real-time interaction between a computer and the self-powered sensing vibration force measurement platform, reducing sensing energy consumption while obtaining pedestrian bridge vibration comfort assessment results that are closer to reality.

The application discloses a method, device and equipment for identifying a movement time point of a surface electromyogram signal and a medium. The method comprises the following steps: acquiring a to-be-detected force platform signal corresponding to a to-be-detected surface electromyogram signal; wherein the acquisition time points of the to-be-detected surface electromyogram signal and the to-be-detected force platform signal are synchronous; determining a positive slope cumulative function according to the to-be-detected force platform signal, and performing first-order derivation on the positive slope cumulative function to obtain a positive slope change rate function; determining a movement time point of a movement event corresponding to the to-be-detected surface electromyogram signal according to the positive slope change rate function and a movement change rate threshold; wherein the independent variable and the dependent variable of the positive slope cumulative function are the acquisition time point of the to-be-detected force platform signal and the cumulative positive slope respectively, and the movement time point is a starting time point or an ending time point. The embodiment of the application solves the problem that the traditional identification method is susceptible to noise interference of the surface electromyogram signal, and improves the identification accuracy of the movement time point.

The present application relates to the technical field of force measuring platform, and discloses a force measuring platform leveling control method, system, electronic equipment and storage medium, the method comprises the following steps: obtaining the force value of the adjustable foot pad of the force measuring platform body structure and the force value of the three fixed foot pads; obtaining the inclination angle value collected by the IMU sensor arranged at the geometric center of the force measuring platform and the height value of the adjustable foot pad collected by the grating ruler sensor; calculating the height adjustment value of the adjustable foot pad and performing leveling control; wherein the center area of the upper plate of the force measuring platform body structure is provided with a main hole area, a honeycomb array is arranged in the main hole area, and the honeycomb hole is filled with glass fiber. The present application can solve the problems of low efficiency, poor precision and high cost of traditional leveling. At the same time, the honeycomb array and glass fiber filling design of the force measuring platform not only realize weight reduction and facilitate carrying, but also reduce the attenuation of the Bluetooth signal, improve the transmission performance, and ensure the measurement accuracy and use flexibility in high-precision and dynamic scenarios.

The utility model provides a building jacking inclination-rectifying in-place connecting structure. The building jacking inclination-rectifying in-place connecting structure comprises an original structure, a counter-force platform, a jacking piece, a supporting seat and an adjusting gasket. The column breaking mode is adopted, the original structure of the building is reserved, and the counter-force platform is arranged below the original structure. A jacking piece is installed on the counter-force platform, the multiple supporting seats are adjacently arranged in the vertical direction, connecting flanges are arranged at the two ends of each supporting seat, and the connecting flanges on every two adjacent supporting seats are detachably connected, so that every two adjacent supporting seats can be freely disassembled, assembled and combined. The number of the used supporting seats can be determined according to the distance between the final counter-force platform and the original structure, and the multiple supporting seats are connected and fixed. And the original structure is supported. Unnecessary operation of later customization is reduced, and on-site construction efficiency is improved.

The application discloses a portable and detachable intelligent electric wheelchair, which comprises a power platform, drive wheels are installed at both ends of one side of the power platform, supporting rollers are installed at both ends of the other side of the power platform, an operation rudder is arranged upwards at the front side of the power platform, throttle handles are arranged at the upper ends of the operation rudder, a mounting groove is arranged downwards at the rear of the power platform; the application further comprises a seat platform, a backrest plate is rotatably connected to the rear side of the seat platform, a first supporting inclined rod and a second supporting inclined rod are rotatably connected to the lower end of the rear of the seat platform, a parallel pull rod is rotatably connected between the first supporting inclined rod and the second supporting inclined rod, supporting connecting sleeves are arranged at both ends of the lower sides of the first supporting inclined rod and the second supporting inclined rod, and the power platform is provided with a plurality of electromagnetic locks which are used for one-to-one corresponding connection with the supporting connecting sleeves. The application can be switched between the electric wheelchair and the balance car, and can provide a fashionable and practical travel option for young people.

The application provides a lower limb muscle strength prediction and balance function evaluation method based on plantar pressure and spatial pose fusion, comprising: collecting plantar pressure data, lower limb spatial pose data and human individual physiological parameters of a subject, and combining a force platform to obtain ground reaction force data; real lower limb muscle strength is calculated by using inverse dynamics and Hill muscle model, and a plantar pressure + spatial pose-lower limb muscle strength data set is constructed; the optimal sensor quantity and layout are obtained by combining a heuristic optimization algorithm and a machine learning regression model, taking prediction accuracy and information redundancy as indexes; a deep forest model is trained based on fusion features, real-time prediction of hip joint, knee joint and ankle core muscle group muscle strength is realized; further, muscle strength symmetry analysis, weak muscle group identification and hip-knee-ankle force ratio analysis are completed, and multi-dimensional quantitative evaluation of balance function is completed. The method can realize high-precision lower limb muscle strength prediction under limited sample conditions, and output multi-dimensional balance function evaluation results.

The invention relates to the technical field of human motion scientific experiment testing, and discloses a three-dimensional force measuring system capable of adjusting a multidirectional slope angle based on a force measuring platform, which comprises a protective jumping platform module, a force measuring platform module and a multidirectional slope angle adjusting device, the protection diving platform module is fixed to the ground, the multidirectional slope angle adjusting device is arranged in the protection diving platform module, and the force measuring platform module is arranged on the upper surface of the multidirectional slope angle adjusting device. The multidirectional slope angle adjusting device adjusts the slope angle in any direction in a three-dimensional space by adjusting the lengths of a plurality of telescopic push rod devices; the force measuring table module is used for collecting three-dimensional force, torque and pressure center data when a human body lands, multi-directional slope angles of the force measuring table module can be adjusted at will, and the typical slope environment encountered in the real parachute landing condition is accurately simulated.

Assessing function of vestibular and oculomotor systems based on data output by a videonystagmography system and a force platform. A system includes a videonystagmography headset comprising an image sensor, wherein the image sensor outputs a video stream comprising a plurality of images of eyes of a user captured when the user wears the videonystagmography headset for a gaze test duration. The system includes a force platform comprising a load cell, wherein the force platform outputs a data stream indicating a plurality of tilt positions of the force platform captured when the user stands on the force platform for a balance test duration.

The invention relates to the field of biomedical engineering, in particular to a method for calculating counter-acting force borne by a human body in the sitting posture kicking training process, and provides a method for calculating counter-acting force based on human body dynamics modeling and the counter weight motion state of a fixing instrument. In order to avoid the use of a traditional three-dimensional dynamometer, the invention provides a novel counter-acting force calculation method for a fixed instrument sitting posture kicking trainer, the method applies a human body dynamics modeling method, and the counter-acting force is calculated by collecting the movement state of a counter weight in the movement process. Human body and outside interaction force in the training process is obtained by combining a human body lower limb dynamic model. The method comprises the following steps: step 1, measuring lower limb parameters of a trainee; 2, according to the lower limb parameters of the trainee, the lower limb joint angle of the trainee in the sitting posture kicking training process is calculated; and step 3, according to the lower limb joint angle of the trainee, calculating the counter-acting force applied to the lower limbs of the trainee in the sitting posture kicking training process.

A device for measuring a bearing force exerted by the foot of a patient, the device including: a shell; an inner sole that is intended to support the foot of the patient and that is held in the shell, the shell and the sole being arranged so that, when the foot of the patient is bearing against the inner sole, the forces exerted by the foot of the patient on the inner sole are transmitted to the shell in a limited number of contact regions; sensors that are interposed between the shell and the inner sole in the contact regions, respectively, and that are each configured to deliver a signal representative of a force exerted on the corresponding contact region; and a processing unit connected to the sensors and configured to acquire the force signals delivered by the sensors.

The invention discloses a reaction wheel vibration isolator micro-vibration suppression performance evaluation method, which comprises the following steps of: installing a reaction wheel simulation piece and a vibration isolator on a three-way vibration table, setting a plurality of amplitude sweep frequencies, collecting an acceleration signal and calculating a suppression ratio through FFT (Fast Fourier Transform); building a six-component force measuring table, measuring six-direction disturbance before and after vibration isolation, and calculating power spectrum density, frequency-band integration and a comprehensive inhibition ratio; and the micro-vibration suppression performance of the vibration isolator is evaluated by integrating the results and combining a satellite cabin transfer function. The method adapts to an on-satellite micro-vibration environment, can be associated with load indexes, and can also be popularized to evaluation of other on-satellite disturbance sources such as control moment gyroscopes and acceptance and optimization of power-assisted vibration isolator products.

The invention discloses a two-dimensional force square sensor specially used for force control polishing, the two-dimensional force square sensor comprises an overall square elastic body, an upper cover plate, a lower cover plate and a main plate, the elastic body comprises an elastic body hub, a stress table and four strain beams, the elastic body hub is square, a round hole is formed in the center of the elastic body hub, and the stress table is arranged in the round hole; the four strain beams are uniformly distributed between the stress table and the elastomer hub; the upper cover plate and the lower cover plate are arranged at the upper and lower ends of the elastomer, and the stress table protrudes out of the upper cover plate; the main plate is arranged below the upper cover plate and is detachably connected with the elastomer hub; pasting a plurality of strain gauges on the four strain beams to form two Wheatstone bridges, and respectively measuring the tangential force Fy and the normal force Fz; the two Wheatstone bridges are connected to the mainboard, the mainboard supplies power to the bridge circuit and collects data, and an EtherCat communication line and a power cable comprising a power line and a 485 communication line are connected to the mainboard. The sensor has the advantages of high rigidity, good dynamic performance and high measurement precision.

The invention discloses a human body mechanics state evaluation system and method based on an integrated dual-sensing dynamometer. The system comprises a multi-modal heterogeneous sensing fusion dynamometer platform, a data acquisition synchronization module and an upper computer, wherein the upper computer is internally provided with a data fusion processing module and a result generation module; the multi-mode heterogeneous sensing fusion force measuring platform is built by fixing pressure sensors on corresponding six-dimensional force measuring plates to form a stacked structure. The fusion processing module acquires fusion data by picking up six-dimensional force data and plantar pressure distribution data; and the result generation module is used for extracting the multi-modal biomechanical characteristics from the fused data and generating a human body biomechanical state evaluation report. According to the invention, through hardware integration and high-precision synchronous acquisition, plantar pressure and six-dimensional force data are fused, and accurate plantar shear force data are analyzed in combination with space-time registration, physical verification and reverse estimation, so that multi-dimensional features are extracted, and intelligent and quantitative evaluation of features such as a balance function, gait abnormality and a foot pathological state is realized.

The application belongs to the technical field of aviation manufacturing and intelligent machining, and discloses a feed control method for drilling of titanium alloy and composite material laminated material. Before drilling, the equivalent friction representation model of the feed transmission chain is established by collecting the feed motor speed, current and feed position through the no-load movement. In the drilling process, the extended state observer is constructed based on the feed motor current and speed, the total load torque of the feed shaft is estimated online, and the net cutting torque is obtained. According to the feed position and the preset laminated thickness, the current machining stage is judged. When the tool is in the titanium alloy layer, the unipolar force limiting control mode is adopted to adjust the feed speed. When the tool is in the composite material layer, the bipolar constant force control mode is adopted to adjust the feed speed. The method does not need external axial force sensors or force platforms, can realize online estimation of the feed axial force and differential adaptive feed control, and is beneficial to improve the drilling quality of titanium / composite laminated material, reduce the machining damage and prolong the tool life.

The utility model is a kinematic parameter detection device for outdoor high jump, including a tracking camera, a take-off area camera, a data processor, a PC, a display screen, a force measuring platform, a capacitive pressure sensor and an inductive proximity sensor. The force measuring platform is installed in the sports field of the take-off area, the capacitive pressure sensor is wrapped on the high jump crossbar, and the inductive proximity sensor is installed on both sides of the high jump crossbar shelf, and the inductive proximity sensor can move up and down along the height direction of the high jump crossbar shelf; the force measuring platform, the capacitive pressure sensor, the inductive proximity sensor, the tracking camera, and the take-off area camera are all connected to the PC through a hub and a data processor, and the PC is connected to the display screen at the same time. It meets the sports requirements, real-time display, and can obtain sports morphology and athlete mechanical information, which is conducive to establishing a set of data testing and analysis systems to obtain complete sports information, assist training and make professional suggestions.

Systems, devices, and methods including at least one column, each including: an assembled parallel pair of a first extrusion and a second extrusion, at least one bracket connecting the first extrusion and the second extrusion as one piece, and at least one runner configured to slide along an internal space defined by the first extrusion and the second extrusion; and a lift platform connected to the at least one runner.

The invention relates to a support-free rapid construction method for a rotational flow well in a slow hill landform limited space, which comprises the following steps of: arranging a closed ring beam which is also used as a permanent structure and a construction conversion carrier at a preset depth above a design base of the rotational flow well, and modularly combining a heavy excavation method, a reverse construction method and a sequential construction method in a vertical space; an upper soil body and an adjacent building structure are constructed synchronously in a two-stage sloping mode, a lower rock body is formed in a segmented and reverse mode with the ring beam as a counter-force platform, a middle shaft is formed in a segmented and sequential mode with the ring beam as a built-in end, an additional supporting system is omitted in the whole process, and supporting-free, zero-interference, low-cost and rapid construction is achieved.

1. Name of the product in this design: Force measuring platform. 2. Purpose of this design: To construct the overall structure of a force measuring instrument, which is used to test clamping force and expansion force. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present invention discloses a jacking device and a vertical in-situ jacking method, wherein the jacking device comprises: a reaction platform, wherein the reaction platform is provided with a matching portion spaced apart in the longitudinal direction; a self-locking mechanism, wherein the self-locking mechanism is arranged on the reaction platform, wherein the self-locking mechanism comprises: a clamping portion and a jacking bracket, wherein the self-locking mechanism is arranged on the reaction platform, and the clamping portion is connected with the matching portion, wherein the structure to be jacked is placed flat on the jacking bracket, wherein the clamping portion can move on the reaction platform during the movement of the self-locking mechanism toward the top surface of the reaction platform, and the jacking bracket realizes the jacking of the structure to be jacked in the longitudinal direction; wherein when the self-locking mechanism stops moving, the clamping portion is clamped and fixed with the corresponding matching portion; and a jack, wherein the jack is arranged on the self-locking mechanism. The jacking device of the present invention is arranged in the structure to be jacked, is not restricted by the site, has an operating space outside the structure, and does not need to install additional structures such as scaffolding, is easy to use, and has a wide range of applications.

The application discloses a three-axis force measuring mechanism, an upper limb rehabilitation robot system and a control method. The three-axis force measuring mechanism comprises a Z-axis force measuring mechanism arranged on a bottom plate of the upper limb rehabilitation robot. An upper end of the Z-axis force measuring mechanism is provided with an X-Y composite force measuring mechanism. The force transmission rod is located directly above the center of the bottom plate. The Z-axis force measuring rod is at least partially exposed to the force transmission platform. The length of the Z-axis force measuring rod is 10-20 cm. The spacing between the Z-axis support frame and the center of the bottom plate is 15-25 cm. The test torque is amplified by a long force arm after a slight force change. Then, the test torque is converted into force data. The test precision is improved. Meanwhile, the internal structure is more compact.

The invention discloses a gluing diaphragm and pole piece bonding effect testing device, which comprises an upper pressing support assembly, a lower pressing assembly and a platform control assembly, and is characterized in that the upper pressing support assembly is used for supporting a prefabricated body participating in a test; the downward pressing assembly follows the press machine and applies downward pressure to the prefabricated body supported by the upward pressing supporting assembly; the platform control assembly regulates and controls the upper pressing supporting assembly to support the prefabricated body through the shaft connecting assembly and fixes the position of the prefabricated body. According to the invention, the gluing diaphragms and the pole piece preforms are used as test workpieces to be placed on the upper pressing support assembly, centering and clamping of the workpieces can be controlled through the servo control mobile platform according to the gluing diaphragms and the pole piece preforms with different models and sizes, and the lower pressing assembly applies pressure downwards; the yield force value of the glued diaphragm and the pole piece preform is tested, the bonding effect of the glued diaphragm and the pole piece is tested, and a test basis is provided for optimization of a battery cell manufacturing process.

Assessing function of vestibular and oculomotor systems based on data output by a videonystagmography system and a force platform. A system includes a videonystagmography headset comprising an image sensor, wherein the image sensor outputs a video stream comprising a plurality of images of eyes of a user captured when the user wears the videonystagmography headset for a gaze test duration. The system includes a force platform comprising a load cell, wherein the force platform outputs a data stream indicating a plurality of tilt positions of the force platform captured when the user stands on the force platform for a balance test duration.

The utility model relates to the technical field of force measuring platforms, in particular to six-dimensional force measuring platform calibration equipment, which comprises a frame, a normal loading frame, a lateral loading frame and a force measuring platform clamp, and is characterized in that the normal loading frame is positioned at the upper part of the six-dimensional force measuring platform calibration equipment and is used for realizing calibration of normal force; the lateral loading frame is located on the left side of the six-dimensional force measuring platform calibration device and used for achieving calibration of lateral force, the force measuring platform is fixedly clamped on the force measuring platform clamp, and the top of the force measuring platform is fixedly connected with the normal loading frame through the normal loading clamp. According to the six-dimensional force measuring platform calibration equipment, the influence of the friction force of the pulleys on the loading precision is reduced. The normal loading frame can realize calibration of normal force, and the two lateral loading frames are respectively used for horizontal X-direction and Y-direction force transmission and are matched with a plurality of standard sensors to carry out loading at different positions, so that the actual stress condition can be more accurately simulated, the calibration precision of six-dimensional force is effectively improved, and the requirements of various industries on high-precision measurement can be met.

The utility model relates to a three-dimensional gait analyzer, and relates to the field of medical instruments, the three-dimensional gait analyzer comprises a force measuring table, the two sides of the force measuring table are respectively provided with a sliding support in a sliding mode, the top of each sliding support is fixedly connected with a connecting piece, the connecting pieces are arranged parallel to the ground, and the connecting pieces linearly extend in the walking direction of a tested person; the ends, away from the sliding supports, of the connecting pieces are fixedly connected with handheld grips. A receding opening used for exposing the lower half portion of the tested person is formed between the connecting piece and the sliding support. Locking structures used for locking or releasing the sliding support are installed on the two sides of the force measuring table respectively. According to the invention, the situation that the tested person falls down due to imbalance in the three-dimensional gait analysis test process on the force test table can be reduced.