140 results about "Inverse dynamics" patented technology

The invention relates to a motion control method of a lower limb rehabilitative robot. In the method, aiming at different rehabilitation stages of a patient, two working modes of passive training and active training are carried out: under the mode of passive training, the patient is driven by controlling the robot to finish specific motions or motion according to a right physiological gait track; abnormal motions of the patient are completely restrained; and the patient passively follows the robot to do walking rehabilitation training; under the mode of active training, limited abnormal motions of the patient are restrained by the robot; through a real-time detection on joint driving forces generated when the patient acts on the robot in the motion process, human-computer interaction moment is extracted by utilizing an inverse dynamic model to judge the active motion intention of lower limbs of the patient; and the interaction moment is converted into correction value of gait track by utilizing an impedance controller to directly correct or generate the gait training track the patient expects through an adaptive controller, therefore, the purpose that the robot can provide auxiliary force and resistant force for the rehabilitation training can be indirectly realized. By means of the motion control method of the lower limb rehabilitative robot, rehabilitation training motions suitable for different rehabilitation stages can be provided for a dysbasia patient, thereby enhancing active participation degree of the rehabilitation training of the patient, building confidence of the rehabilitation and positivity of the motion, and then enhancing effect of the rehabilitation training.

A human-type link system, such as a humanoid robot having a dynamically feasible motion of the link system that is generated when a reference joint acceleration that is only calculated from a kinematical constraint condition is determined not feasible by an evaluation of external force computed based on an inverse dynamics calculation, or is generated by calculating from a dynamic constraint condition and a kinematical constraint condition simultaneously, the dynamic constraint condition is formulated by using an actuation space inverse inertial matrix that represents the relation of force acting on the link system and the acceleration of the link system caused by the force.

A method for estimating joint load at a joint of a segment. The method comprises the steps of receiving kinematic data, determining a modified acceleration using at least the kinematic data, estimating a joint load using at least the modified acceleration; and determining simulated kinematic data for the segment using at least the joint load. The present invention thus addresses the problems with conventional inverse dynamics analysis by providing a forward dynamics solution for estimation of joint loads that is stable, guaranteed to converge, computationally efficient, and does not require acceleration computations. According to one embodiment of the present invention, a joint load is estimated recursively.

The system analyses a golf swing, determining individual joint powers generated in a player's body with high levels of accuracy, using inverse dynamics and detailed modelling of the player's body. A depth camera is used to measure body segment shapes and a magnetic motion capture system and 3D force plate system used to measure swing parameters. The system produces an expeditious analysis without the need for highly skilled technical personnel and is suitable for individual coaching and compilation of large golf swing databases.

A method, system, and program enabling a variable varying with animal's motions such as a joint torque to be accurately measured in a series of the animal's motions. First, a reference relational expression representing a relation between myoelectric potentials and a knee joint torque is set on the basis of the myoelectric potentials and the knee joint torque (variable) measured by using an inverse dynamics model. Then, the knee joint torque is measured on the basis of the measured myoelectric potentials and according to the reference relational expression. For example, if an animal makes first and second motions continuously, first a reference relational expression is set on the basis of myoelectric potentials measured in the first motion and a knee joint torque corresponding to the first motion. Then, a knee joint torque corresponding to the second motion is measured on the basis of the myoelectric potentials measured in the second motion and according to the reference relational expression. The first and second motions are arbitrary and the animal is not forced to make a given motion.

A method for estimating joint load at a joint of a segment. The method comprises the steps of receiving kinematic data, determining a modified acceleration using at least the kinematic data, estimating a joint load using at least the modified acceleration; and determining simulated kinematic data for the segment using at least the joint load. The present invention thus addresses the problems with conventional inverse dynamics analysis by providing a forward dynamics solution for estimation of joint loads that is stable, guaranteed to converge, computationally efficient, and does not require acceleration computations. According to one embodiment, a joint load is estimated using an approach of closed form dynamics.

The invention provides an industrial robot dragging teaching method without adopting a torque sensor. The method comprises the steps that a joint inverse dynamic model is adopted for joint moment compensation, so that a joint is controlled to be in a near-zero force balanced control state; according to a jitter control principle, feedforward is controlled through drive jitter within a dead zone of friction force, so that the joint is in an activated state, velocity integral grain of a universal control system adopting serial PID control is one order of magnitudes that of a system adopting normal control, and the controller velocity integral gain is increased to improve the dynamic response of the control system in the dead zone of the friction force; a slope dynamic compensation method is adopted for compensating coulomb friction; and a dragging teaching technology is achieved in a universal position control mode, so that switching of a control mode of a driver is avoided. According to the dragging teaching method adopted in the invention, the torque sensor is not needed, and the cost is low.

Apparatus and methods are provided for estimating joint forces and moments in human beings. A forward dynamics module determines simulated kinematic data. An error correction controller forces tracking error between the simulated kinematic data and measured (or desired) kinematic data to approach zero. The error correction controller generates a modified acceleration for input into an inverse dynamics module. The estimated joint forces and moments track the measured (or desired) kinematics without the errors associated with computing higher order derivatives of noisy kinematic data.

The invention discloses a model inverse dynamic algorithm for the extreme power of a power battery pack, and aims to avoid the influence of the state of charge (SOC) accuracy of a battery on an extreme power estimated value due to calculation of the electrodynamic potential of the battery through a mathematical model. The model inverse dynamic algorithm comprises the following steps: establishing a polarization voltage model of a single battery and a terminal voltage model of the single battery by adopting a Thevenin equivalent circuit; computing the direct-current resistance R, polarization parameter Rp and tau of the battery according to an HPPC (Hybrid Pulse Power Characterization) experiment, and establishing a corresponding relation through the SOC and a temperature; computing current EMF(t) by using a current sampled voltage value U(t) and current I(t); computing a polarization voltage Up(t+dt) after pulse time according to Up(t); calculating extreme current according to EMF(t) and Up(t+dt); comparing the extreme current with a system design required value Imax, and selecting lower current for calculating a voltage value U(t+dt) after the pulse time; and computing extreme power and charging extreme power.

The invention discloses a man-machine co-driving control system based on a driver model and handling inverse dynamics and a switching mode of the man-machine co-driving control system. The man-machineco-driving control system comprises a sensor system, a driving intention recognition model, a man-machine co-driving model, a right switching control system and an executive system. The method comprises the following steps: monitoring driving environment information, vehicle state information and driver state information by the sensor system, wherein a driver state signal is transferred to the driving intention recognition model; establishing a man-machine co-driving model based on the handling inverse dynamics and the driver model, and calculating expected control input and control input ofthe driver; performing necessary correction by the system on the basis of understanding the driving intention of the driver based on the established man-machine co-driving switching law, and performing full authority control by the other party when the driver temporarily loses control ability or the auxiliary system temporarily loses auxiliary operational capability to avoid unnecessary man-machine interference. According to the man-machine co-driving control system disclosed by the invention, the operating burden of the driver is reduced, and man-machine alternative disharmony is avoided.

The invention discloses a lower limbs rehabilitation robot movement control system which comprises a passive training mode and an active training mode these two working modes according to different rehabilitation effects at different restoration stages of a patient, wherein in the passive training mode, the patient is driven by mechanical legs to move according to a predetermined physiological gait trajectory, the generated abnormal movement is completely inhibited; in the active training mode, limited abnormal movement of the patient is inhibited by the mechanical legs, the joint driving force generated by the action of the patient on the mechanical legs is extracted by a man-machine inverse dynamics model through real-time detection of man-machine interaction, the active movement intent of the patient is acquired, so that the patient can initiatively adjust the gait trajectory in real time, and the enthusiasm of the patients initiatively participating in the rehabilitation training is improved. The lower limbs rehabilitation robot movement control system is suitable for the lower limbs rehabilitation training movement at different restoration stages, enhances the initiative of patients participating in the rehabilitation training, and establishes the rehabilitation confidence and the movement enthusiasm of the patients, so as to enhance the effect of rehabilitation training.

The invention discloses an efficient modeling method for a multi-degree of freedom (multi-DOF) mechanical arm. The method mainly comprises the following steps of: describing speed, acceleration, force and moment of each joint of the mechanical arm by using the screw theory; performing inverse dynamic modeling on the mechanical arm by using the spatial operator algebraic theory; and obtaining a generalized inertial mass matrix of the mechanical arm and a factorization form of the inverse matrix of the mechanical arm by using a Kalman filter smoothing method so as to obtain an efficient lower dynamic model. According to the method, the efficient dynamic calculation problem of the multi-DOF mechanical arm is solved, and the calculation efficiency of the method is first power magnitude order of the degree of freedom of the mechanical arm; meanwhile, the method has strong theoretical property, intuitive expression form and definite physical significance.

The invention discloses a quaternion-based five-coordinate spline interpolation control method, and relates to a numerical control system. In order to solve the problems that the transfer error between a CAD/CAM system and CNC, the discontinuity between segments destroys the track precision, and the movement speed becomes nonuniform and discontinuous, the quaternion-based five-coordinate spline interpolation control method comprises the following implementing processes: 1, CAM software reads track data on a curve of a parts design drawing, and establishes a CAM tool path; 2, the CAM tool path is converted into a numerical control code format of the five-coordinate spline interpolation, wherein the numerical control code format of the five-coordinate spline interpolation is divided into three formats: a linear-translation numerical control code format of the five-coordinate spline interpolation, a linear-rotation numerical control code format of the five-coordinate spline interpolation, and a universal numerical control code format of the five-coordinate spline interpolation; 3, converting the three numerical control code formats of the five-coordinate spline interpolation into a joint movement program through an inverse dynamics transformation formula; and 4, finishing processing parts. The quaternion-based five-coordinate spline interpolation control method is widely applied to the field of numerical control systems.

The invention discloses a rehabilitation robot and a human-machine cooperative interaction force control method thereof. The rehabilitation robot comprises a robot arm with at least one joint. The method for controlling the human-machine interaction force of the rehabilitation robot comprises the following steps: detecting an action moment of a patient's affected side limb acting on the robot arm;Generating a target motion trajectory of the manipulator; Establishing a dynamic model of the manipulator; Calculating a joint moment required for generating the target motion trajectory by using aninverse dynamics principle; Calculating a friction compensation torque of the joint and a dynamic compensation torque of the affected side limb of the patient; The joint torque, the action torque, thedynamics compensation torque, and the friction compensation torque are used as control inputs to the manipulator. The robot can provide the compliant force interactive control between the patient andthe rehabilitation robot arm, provides complete dynamic compensation, improves the equipment motion starting ability and flexibility, and is favorable for improving the experience degree of the patient to the auxiliary rehabilitation training. The invention can provide the compliant force interactive control between the patient and the rehabilitation robot arm, provides complete dynamic compensation, and improves the equipment motion starting ability and flexibility.

The invention relates to an automobile engine thermal management system modeling and control method, and belongs to the technical field of control. The aim is to provide an engine thermal management system dynamic modeling method and a water temperature control method. In the system dynamic modeling method, an accurate heating power model of an air cylinder to an inner wall, a heat exchange coefficient model of a water jacket and cooling liquid and a radiating power model of a radiator are built. The research method of the method comprises the following steps that according to the structure, the principle and measurable signals of an engine thermal management system, a system dynamic model is built; seen from the heat convection heat exchange and radiation heat exchange mechanisms, three intermediate variables in the dynamic model are derived; a system inverse dynamic model is derived according to the system dynamic model; a Smith predictor is designed according to the system dynamic model; and a PD feedback controller is designed. The dynamic model of the engine thermal management system is accurately built, and the control accuracy is improved.

The present invention provides a generative adversarial network-based high dynamic range inverse tone mapping method and system. The method includes the following steps that: an original high dynamicrange video is read, and the original high dynamic range video is cut and converted into data sets which can be used for training and are corresponding to a standard dynamic range and a high dynamic range respectively; a generative adversarial network is established based on a convolutional neural network and a hopping type connection is established, and standard dynamic range images are convertedinto high dynamic range images, namely inverse tone mapping is performed; and the entire generative adversarial network is continuously optimized according to a set comprehensive objective function,and a finally obtained network can complete mapping from the standard dynamic range to the high dynamic range. With the method of the invention adopted, the problems such as non-linearity insufficiency and complicated parameter adjustment of an existing non-learning method can be solved; the one-dimensional characteristic and gradient characteristic of the high dynamic range images are considered,so that inverse dynamic mapping of the high dynamic range can be better realized.

The joint rotational angles of joints 9, 11 and 13 of each leg 2 of a bipedal walking body 1 are detected to grasp the positions/postures of the corresponding rigid bodies 10, 12 and 14 of each leg 2 on a leg plane passing the joints 9, 11 and 13 of each leg 2. At the same time, the acceleration of a reference point (the origin of a body coordinate system BC) of the bipedal walking body 1, the floor reaction force acting on each leg 2 and the position of an acting point thereof are grasped in terms of three-dimensional amounts. Two-dimensional amounts obtained by projecting the acceleration, the floor reaction force and the position of the acting point thereof, and the positions/postures of the corresponding rigid bodies of each 2 onto the leg plane are used to estimate the moments acting on joints of each leg on the basis of an inverse dynamic model. The stability of the estimated values of joint moments can be improved while securing the accuracy of estimating the joint moments in the bending and stretching directions of each leg, considering three-dimensional motions of the bipedal walking body.

The invention discloses a robot neural network type computed torque controller training platform and training method, belonging to the technical field of robot control. The training platform consists of an upper control unit, an open type motion control driving unit, a high-speed parallel robot virtual reality unit, a data acquisition and communication unit and an artificial neural network-based adaptive control model, wherein motion planning and process monitoring are finished by the upper control unit; the open type motion control driving unit is an actual electrical part which finishes a control command of the upper control unit to convert to electrical control driving; the high-speed parallel robot virtual reality unit is used for realizing construction of a high-speed parallel robot virtual machine and a related three-dimensional scene; the data acquisition and communication unit realizes data communication and can collect a training sample required by the artificial neural network; and the artificial neural network-based adaptive control model consists of a neural network type robot inverse dynamic model approximator and a linear proportional differential feedback controller which work in parallel. The robot neural network type computed torque controller training platform and training method can realize trace tracking control of the high-speed parallel robot and have the characteristics of wide fitness, low system design cost and the like.

The invention provides a method and a device for attenuating interbed multiples during the process of processing marine seismic data. The method comprises the following steps of preprocessing original seismic records to obtain preprocessed seismic records PPR (x, z0; t); overlapping the dynamically-corrected seismic records and obtaining the location of a strong reflecting interface L in which the interbed multiples are generated on the overlapped section; picking up primary reflection waves generated by the interface L from the dynamically-corrected seismic records, and correcting the primary reflection waves inversely and dynamically to obtain a second wave field item P2 (x, z0; t); deleting a reflected wave field above the interface L from the dynamically-corrected seismic records according to the location of the interface L, and carrying out inverse dynamic correction to obtain a first wave field item P1 (x, z0; t); setting a third wave field item P3 (x, z0; t) to be equal to the first wave field item; carrying out calculation according to the first wave field item P1 (x, z0; w), the second wave field item P2 (x, z0; w) and the third wave field item P3 (x, z0; w) to obtain the interbed multiples PLM (x, z0; w) relevant with the interface L; and attenuating the interbed multiples PLM (x, z0; t) of a time domain from the preprocessed seismic records PPR (x, z0; t) to obtain the records PME (x, z0; t) of the attenuated interbed multiples. By the adoption of the method and the device for attenuating the interbed multiples during the process of the processing marine seismic data, as the interbed multiples are predicted and attenuated only through data driving, independent of the precision of a velocity field, the processing quality of the marine seismic data is improved.

The invention provides a guidance law of a multi-constraint aircraft based on a Bezier curve, and belongs to the technical field of aircraft dynamics and guidance. According to a specified aircraft motion model and a three-order Bezier curve equation simulative ballistic trajectory, an attack angle and a heeling angle of the aircraft are determined by four controlling points with two middle controlling points described by parameters k1 and k2; a range of the parameters k1 and k2 meeting requirements of miss distance, collision angle and terminal attack angle is acquired through optimization; values of k1 and k2 corresponding to terminal speed maximum and terminal speed minimum are figured out; and according to a given terminal speed, the parameters of k1 and k2 are determined. Based on inverse dynamics, the terminal collision angle, the attack angle and speed constraint are all considered, requirements on the collision angle, the terminal attack angle and terminal collision speed can be met, and accurate attacks on fixed targets are achieved.

A system, a method and a computer readable medium are provided for simulating a combined musculoskeletal and augmentation device system. The dynamics model of the combined musculoskeletal and augmentation device system receives computed torques at the joints as inputs and delivers simulated kinematic data of the segments as outputs. The augmentation device controller for control of the augmentation device, receives the simulated kinematic data as inputs and delivers assist torques as outputs. The inverse dynamics model for the musculoskeletal and augmentation device system, receives the simulated kinematic data, desired kinematic data of the segments and the assit torques as inputs and delivers the computed net joint torque and muscle torque. The muscle force and muscle capacity module for checking and adjusting the computed torques, receives the computed torques as inputs and delivers computed torques as outputs after the checking and adjustment.

An improved control for an automatically shiftable transmission upshift, wherein the engine output torque and on-coming clutch pressure are coordinated during the shift based on an inverse dynamic model of the transmission to achieve a desired output torque trajectory. At the initiation of an upshift, the engine torque is commanded to decrease in a ramp-like or sloping fashion to and engine output torque value calculated using the dynamic model. This ramp-like or sloping decrease provides smooth shifting, while reducing the likelihood of tie-up between on-coming and off-going clutches within the automatically shiftable transmission.