434 results about "Gravity compensation" patented technology

An unmanned aerial vehicle (UAV) for making partial deliveries of cargo provisions includes a UAV having one or more ducted fans and a structural interconnect connecting the one or more fans to a cargo pod. The cargo pod has an outer aerodynamic shell and one or more internal drive systems for modifying a relative position of one or more cargo provisions contained within the cargo pod. Control logic is configured to, after delivery of a partial portion of the cargo provisions contained within the cargo pod, vary a position of at least a portion of the remaining cargo provisions to maintain a substantially same center of gravity of the UAV relative to a center of gravity prior to delivery of the partial portion. Other center of gravity compensation mechanisms may also be controlled by the control logic to aid in maintaining the center of gravity of the UAV.

A method for obtaining an assist torque to be applied to a human joint, in a human assist system in order to reduce the load on muscles, according to the present invention comprises the step of obtaining a moment due to gravity, acting on a joint of each human segment, based on equations of force and moment balance on each segment. The method further comprises the step of obtaining an assist torque to be applied to the joint to compensate for the moment due to gravity, acting on the joint. In one embodiment of the present invention, various criteria are used such as mechanical energy, metabolic energy and/or a stability/equilibrium factor. In addition, the present invention can account for the situation where there is substantially no relative motion between segments of a given joint and thus, where the mechanical energy component of gravity compensation is approximately zero.

The invention discloses a hand movement tracking system and a hand movement tracking method. The invention comprises an attitude and heading reference system based on an accelerometer, a gyroscope and a magnetic sensor, and a hand movement tracking method based on the attitude and heading reference system. The hand movement tracking method comprises the following steps: firstly, obtaining a triaxial acceleration measured by the accelerometer, a triaxial angular velocity measured by the gyroscope and a triaxial magnetic-field component measured by the magnetic sensor, performing error compensation on the magnetic sensor by adopting a least square method to establish an error model after an upper computer receives sensor data, eliminating high-frequency noise of the triaxial acceleration by virtue of a window low-pass filter, and establishing an error model for the gyroscope so as to perform error compensation on random drift of the gyroscope; secondly, effectively integrating the gyroscope, the accelerometer and the magnetic sensor by virtue of an improved adaptive complementary filtering algorithm to obtain an attitude angle and a path angle; and finally, performing gravity compensation and discrete digital integration on acceleration signals to obtain a velocity and a track of a hand movement. The tracking system and the tracking method disclosed by the invention can be applied to a man-machine interactive system, is convenient to operate, and is strong in experience feeling.

The invention discloses a space manipulator ground microgravity hybrid simulation method, and particularly relates to a realization method for ground-based simulation of a space microgravity environment by a 7-DOF space manipulator. Gravity compensation is realized at the middle part of the 7-DOF space manipulator by adopting the gas flotation method; the middle part of the 7-DOF space manipulator is supported on two gas flotation feet; shoulder parts and wrist parts at two ends as well as an end effector adopt static balance mechanisms to realize gravity compensation; two static balance mechanisms are designed, respectively named as a shoulder part static balance mechanism and a wrist part static balance mechanism, and used for realizing gravity compensation for a 2-DOF manipulator formed by a shoulder joints 1 and 2 and the end effector as well as gravity compensation for a 3-DOF manipulator formed by wrist joints 5, 6 and 7 and the end effector, as a result, gravity compensation for the whole space manipulator system is realized.

The invention discloses a negative hand locking rack with gravity supplement function, which comprises the following parts: gravity supplement mechanism, straight-line joint mechanism, shoulder joint mechanism, middle joint mechanism and ball joint mechanism, wherein the straight-line joint mechanism is set on the gravity supplement mechanism with top connecting one end of shoulder joint mechanism vertically through small arm; the other end of shoulder joint mechanism connects one end of middle joint mechanism through big arm; the other end of middle joint mechanism connects ball joint mechanism through front arm; The negative hand locking rack possesses six freedom degrees, which satisfies the orientation need of operation mechanics.

The invention provides an impedance control method for a flexibility joint mechanical arm based on a connection and damping configuration, and belongs to the technical field of robot controlling. The problem in a traditional mechanical arm control method that during the flexibility joint mechanical arm control process, due to the fact that the residual oscillation is large, the aim of stable control cannot be achieved is solved. The technical points are that according to a CAD three-dimensional model, a kinetic parameter and a kinematic parameter of the flexibility joint mechanical arm are obtained; according to the parameter identification, a key parameter of a flexibility joint is obtained; a kinetic equation of the flexibility joint mechanical arm is established; a gravity compensation algorithm and an external force compensation algorithm based on the motor position are established; a gravity compensation value and an external force compensation value of the mechanical arm are calculated and obtained; a minimum Hamiltonian function value on the expectation balance position of motor position information is calculated and obtained; an expectation connection matrix and a damping matrix in the impedance control are calculated; an impedance control rule of the flexibility joint based on the connection matrix and the damping matrix are obtained. The impedance control method for the flexibility joint mechanical arm based on the connection and the damping configuration can be used for controlling service robots, medical robots and space robots.

The invention relates to a polishing method of a portal lifting robot based on force control. The polishing method comprises the following steps: an industrial personal computer generates an offline path according to a workpiece model, and the robot processes a workpiece according to the offline path; a force sensor acquires force information at the tail end of the robot in real time to return to the industrial personal computer, and the industrial personal computer obtains returned force through gravity compensation according to the force information; the industrial personal computer obtains a difference between a set force target value and the returned force, and obtains a position corrected quantity through a force controller; and the sum of the position corrected quantity and a present position of the robot is obtained, and an impedance controller obtains a control quantity to control polishing acting force in robot processing. The polishing method eliminates the disturbance of tool gravity on the polishing acting force in the polishing process to guarantee the detecting and control precision of the polishing acting force, and is high in sensor measuring precision, high in robot control precision and excellent in processing effect.

The present invention relates to data arm mechanism for remote operation job of robot. The data arm mechanism is one mechanical arm with six rotating joints, and each of rotating joints is provided with one potentiometer as angle sensor. The data arm has gravitational compensation mechanism and may be worn by operator for leading motion or may be drawn to required state without being worn, and it may stop in any position without need of auxiliary outside force. The data arm has length regulating mechanism for person of different arm length to wear. The present invention can detect the rotation angles of total six freedoms of the shoulder joint, elbow joint and wrist joint of the operator, and is suitable for control platform of remote operated robot and for being worn onto arm of the operator.

The invention discloses a total-space smooth hole insertion control method applied to an assembly robot and based on real-time force control. The total-space smooth hole insertion control method applied to the assembly robot and based on real-time force control comprises the steps that a bolt hole insertion real-time force control system of the assembly robot is established by means of a six-dimensional wrist force sensor, a real-time communication software package and the like; the influence of the gravity component on the reading of the six-dimensional wrist force sensor during total-space work of the robot is eliminated through a gravity compensation method based on the standard position; and the common phenomena of jamming and excessive clamping in the bolt hole insertion process are avoided through the design of a stress analysis and force/position hybrid control strategy in the approaching stage, the hole searching stage, an insertion stage and an insertion completing stage of a hole insertion task, thus the insertion success rate of the robot is increased, and the insertion efficiency of the robot are improved; and a detector based on a support vector machine is arranged in a multi-dimensional force time sequence window, so that automatic detection of the hole searching completion state is achieved, and accurate switching between the hole searching subtask and the hole insertion subtask is guaranteed. By adoption of the total-space smooth hole insertion control method applied to the assembly robot and based on real-time force control, control over high-efficiency and high-accuracy chamfer-free smooth hole insertion assembly work can be achieved through a conventional rigid joint robot.

A system and method for providing a tactile virtual reality to a user is present. The position and orientation of the user is utilized to generate a virtual reality force field. Forces are in turn generated on the user as a function of this force field. A six-axis manipulator is presented for providing a user interface to such a system. This manipulator provides a unique kinematic structure with two constant force springs, which provide gravity compensation so that the manipulator effectively floats.

The invention discloses a hybrid maglev gravity compensation apparatus comprising a static gravity compensation module. The static gravity compensation module comprises: an intermediate moving component, an exterior fixed component arranged around the intermediate moving component, and a bottom fixed component arranged below the intermediate moving component. The intermediate moving component is in a radially suspended state with the magnetic forces between the exterior fixed component and the intermediate moving component, such that a vertical guiding to the intermediate moving component is carried out. Static gravity compensating between the exterior fixed component and the intermediate moving component can be carried out with adjustable magnetic forces. According to the invention, non-contact displacement between relatively moving objects can be achieved with maglev forces. Meanwhile, gravity compensation, horizontal and vertical decoupling of a wafer supporting stage can be achieved.

The invention discloses a gravity compensation device which is used for supporting a micropositioner of a worktable and a reticle stage in a photoetching machine and is communicated with a gas circuit of a gas supplying gas source. The gravity compensation device comprises a first gas chamber, a piston, a supporting plate and a pneumatic valve, wherein the piston is supported by the first gas chamber; the supporting plate is used for supporting the micropositioner, is positioned above the piston and is fixedly connected with the piston; and the valve is communicated with the first gas chamber and is used for adjusting the air pressure of the first air chamber. The gravity compensation device has the advantages that: firstly, the gravity compensation device has a simple structure; secondly, the gravity compensation device has lower rigidity so as to isolate low-frequency vibration; thirdly, the gravity compensation device has certain damping so as to reduce resonance; thirdly, the gravity compensation device has no action of exhausting gas to the environment and can be applied to a vacuum environment; and fourthly, when a load changes, the error of a static position of the reticle stage can be eliminated by adjusting the air pressure of the first gas chamber.

A gravity compensation device for solar wing low temperature unfolding experiment is capable of realizing one sixth gravity compensation and zero gravity compensation of solar wing at a temperature of -120 DEG C. The device also can carry out solar wing multi-angle repeated unfolding and folding experiments in a limit position by simulating a landing situation when the included angle between the moon surface and the horizontal plane is 15 degrees. A balance rod is adopted in the device to carry out gravity compensation, and is completely made of metals so as to adapt to the low temperature environment. The three-dimensional trace movement of the mass center of a solar wing is completed by the swinging of a guide rail and a suspension rod; the conventional bidirectional guide rail structure composed of a solar wing vertical guide rail and a solar wing horizontal guide rail is broken through, thus the system complexity is reduced, and the movement reliability is improved. A horizontal rotation assembly is adopted to enable the main beam to freely rotate in a horizontal plane, and the gravity compensation technology is broken through when the included angle between a solar wing and the horizontal plane is 15 degrees namely the extreme working condition. A pulley and a pulley structure are adopted to reduce the movement resistance. A main beam having an I-shaped aluminum structure is adopted, the weight of movable parts is reduced, and thus the inertia force during the folding and unfolding process of a solar wing is effectively reduced.

The invention provides a gravity compensation method for mechanical arm load mass and sensor null drift online recognition. The gravity compensation method comprises the steps that S1, a load mass center and mass recognition module is adopted for obtaining and recognizing the mass center and mass of loads at the tail end of a mechanical arm, and the recognized mass center and the recognized mass of the loads are obtained; S2, a sensor null drift recognition module is adopted for reading the numerical value of a sensor, calculation is performed according to the recognized mass center and the recognized mass, and sensor null drift is obtained; and S3, a gravity compensation module is adopted for performing gravity compensation on the numerical value of the sensor according to the sensor null drift. By means of the method, the problem that due to the additional force and torque introduced by the loads of the tail end of the mechanical arm to the tail-end six-dimensional force sensor by the gravity effect and the presence of sensor null drift errors, the numerical value of the sensor is inaccurate and the final force control effect is affected can be solved, and uncertainty of the sensor null drift determines the necessity of online recognition of the sensor null drift.

A walking robot, respective joints of which are operated through torque servo control to achieve stable pose control, and a pose control method thereof. A virtual acceleration of gravity is calculated using the COG of the robot and gravity compensation torques to apply force to links are calculated from the calculated acceleration of gravity so as to actively cope with external changes including external force or a tilt of the ground, thereby allowing the robot to stably maintain an erect pose and a desired upper body angle. Further, the robot maintains the erect pose with respect to the direction of gravity even under the condition that data regarding whether or not the ground is level or tilted are not given in advance, and maintains uniform poses of an upper body and legs while actively changing angles of ankle joints even if the ground is gradually tilted.

The invention discloses a mechanical arm collision detection and response method based on a six-dimensional force sensor. The six-dimensional force sensor is arranged between a flange at the tail end of a mechanical arm and a load, and the measurement data of the sensor are continuously acquired according to set sampling frequency; a control system of the mechanical arm obtains the force (see the specification for the symbol) and moment (see the specification for the symbol) on the load of the mechanical arm under external action through gravity compensation of the load; collision detection is conducted according to a preset force constant threshold value Fs and a preset moment constant threshold value Ms when the mechanical arm drives the load to make translation movement or rotation movement, and corresponding motions are controlled according to the relative directions of the preset linear velocity/angular velocity of the mechanical arm and external force/moment. By adopting the six-dimensional force sensor for collision detection, detection precision is high, and respond speed is high; by eliminating the influences of load gravity and load posture, sensitive collision detection can still be conducted on heavy loads; motions making collision worse can be stopped instantly once collision occurs, motions in the opposite directions are allowed, and the method is reasonable and practical.

A mobility vehicle includes a personal mobility vehicle having at least one wheel body and a power-assisting system. The power-assisting system includes an actuation unit, a sensing unit and a signal processing unit. The actuation unit has a motor and a power amplifier geared with the motor. The sensing unit includes a motor rotation speed sensor, a multi-axis accelerometer and a multi-axis gyroscope, so as to sense the velocity, acceleration and the absolute angular velocity of the mobility vehicle in motion in real time. The signal processing unit is connected to the actuation unit and the sensing unit, so as to process the signals of the sensing unit. Then, the actuation unit performs inertia compensation, damping compensation and gravity compensation to the mobility vehicle through a dynamic signal-conditioning algorithm. When the mobility vehicle is actuated by human-power, the power-assisting system assists the power automatically to save human labor.

The invention relates to a remote operating system, comprising a master terminal and a slave terminal, wherein the master terminal creates a master terminal operating space to acquire an operation instruction; and the slave terminal creates a slave terminal operating space and collides with an operational object in the slave terminal operating space according to the operational instruction and then feeds back. The master terminal comprises a master interface module which is used for creating the master terminal operating space and mapping the slave terminal operating space and the master terminal operating space into a virtual space, a force feedback device which is used for acquiring the operational instruction and moving in the master terminal operating space according to the operational instruction to obtain a motion state, a master controller which is used for calculating according to the motion state and carrying out gravity compensation to obtain a control force; and the slave terminal comprises a slave interface module used for creating the slave terminal operating space according to the position of a mechanical arm, a slave controller used for controlling the mechanical arm according to the control force and the mechanical arm used for colliding the operation object in the slave terminal operating space. The remote operating system carries out the gravity compensation, thus the mechanical arm operates easily under the condition of heavy load, and the aim of easy operation is realized.

The present invention relates to variable low/zero gravity simulation systems. variable low/zero gravity condition is achieved by substantial immersion in a fluid environment (“buoyancy means”) and using power assist means/robotic displacement devices such as exoskeleton to help user's movement/gravity compensation and/or relief or change loads on the subject's torso and limbs that caused by the weight and shape of the “Buoyancy means”, so that user can experience the effect of the (variable) gravity environment being simulated, such as Zero gravity in which situation user could move effortlessly in a weightless environment. When combine with VR related technology, this can create vivid immersive simulations for extraterrestrial scenes and can be widely used for entertainment, game, training, healing and etc.