WO2019024576A1 - 基于力/力矩传感器的三维力反馈手柄回复力控制结构及方法 - Google Patents
基于力/力矩传感器的三维力反馈手柄回复力控制结构及方法 Download PDFInfo
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- WO2019024576A1 WO2019024576A1 PCT/CN2018/088076 CN2018088076W WO2019024576A1 WO 2019024576 A1 WO2019024576 A1 WO 2019024576A1 CN 2018088076 W CN2018088076 W CN 2018088076W WO 2019024576 A1 WO2019024576 A1 WO 2019024576A1
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- force
- handle
- restoring force
- torque sensor
- axis motor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
Definitions
- the invention relates to the field of force feedback technology, in particular to a three-dimensional force feedback handle restoring force control structure and method based on a force/torque sensor.
- CyberGrasp force feedback gloves developed by CyberGlove.
- the gloves are in the form of an exoskeleton. According to the degree of stretching of the finger joints, the force is applied to the fingertips or joints. Produce a sense of power.
- Omni a typical arm force feedback device from SensAble Technologies, is currently available.
- the arm force feedback device is mainly for the movement of the arm. It has a large working range and can allow the operator's wrist joint, elbow joint, shoulder joint to move in multiple degrees of freedom, and can provide in multiple degrees of freedom. Corresponding resistance, complete the force on the human arm to produce the effect of the field.
- the prior art force feedback device generates a force feedback effect during the operation of the finger or the hand, and enhances the force feedback in the actual operation for the operator, and provides another reliable basis for the accurate positioning operation.
- the force feedback device requires a restoring force, and when the spring is used to generate the restoring force, it is proportional to the push-pull distance (bending angle) of the handle, which greatly interferes with the force feedback. Therefore, the restoring force needs to be controlled to keep it constant.
- the structural design of the force feedback device is reasonable, the force feedback output simulation device has good characteristics, and the accurate measurement of the mechanism recovery force and the real-time adjustment of the recovery force output poses a greater challenge. This has become the current research in force feedback technology. A major technical difficulty.
- Most of the existing force feedback technologies adopt the force control open loop control strategy, which is only adjusted for the force feedback simulation equipment. There is no real-time measurement of the current restoring force output and feedback, and it is not a stable control strategy in the force feedback control. .
- the technical problem to be solved by the present invention is to provide a three-dimensional force feedback handle restoring force control structure and method based on a force/torque sensor, which has a simple structure and can stably control the restoring force of the control handle in real time by using a PID adjustment mode.
- the present invention provides a three-dimensional force feedback handle restoring force control structure based on a force/torque sensor, comprising: a bottom plate 1, two side fixing frames 2, a triangular rib 3, a Y-axis motor 4, and an X-axis motor 5 , inner frame 6, three-dimensional force sensor 7, tension spring 8, Z-axis motor 9, weight mechanism 10, torsion spring 11, torque sensor 12 and handle handle 13; screw connection between the bottom plate 1 and the two side mounts 2 And use the triangular rib 3 to strengthen, the three together constitute the fixed structure of the handle structure; the X-axis motor 5 and the Z-axis motor 9 axis intersect at one point and the Y-axis motor 4 center point through the bearing, the Y-axis motor 4 two The end and the two side fixing brackets 2 are connected by bearings; the mounting holes of the upper end portions of the two side fixing brackets 2 are connected with the bearing shafts of the inner frame 6, and the X-axis motor 5 is disposed at
- the weight mechanism 10 is mounted on the center of the base plate 1 of the handle structure fixed base, and is connected to the tension spring 8 in the vertical direction of the end of the Z-axis motor 9; the torque sensor 12 is mounted on the Z-axis rotation direction of the handle, the Z-axis Electricity
- the machine 9 is mounted perpendicular to the bottom plate 1 and is coupled to the handle handle 13.
- control structure adopts a three-degree-of-freedom uncoupled structure, and the bevel gear is used to change the power transmission direction.
- the tension spring 8 and the torsion spring 11 constitute a spring device, and the restoring force generated by the spring device is compensated by the three torque motors of the X-axis motor 5, the Y-axis motor 4 and the Z-axis motor 9, and the torque motor torque
- the output size is controllable, and together with the spring device in the mechanical structure of the handle, the restoring force is output for different spatial movement positions of the handle.
- a three-dimensional force feedback handle restoring force control method based on a force/torque sensor comprises the following steps:
- the three-dimensional force sensor 7 and the torque sensor 12 detect the restoring force in three directions of the force feedback handle in real time;
- the handle restoring force will be stably tracked and input, that is, when the operating handle handle is freely pushed and pulled in space, the torque motor and the spring device cooperate to generate a reply. Constant force, to achieve stable control of the force feedback handle recovery force.
- the real-time detection of the restoring force is specifically: according to the measurement result of the three-dimensional force sensor 7, using the vector decomposition of the force to obtain the restoring force on the X and Y axis inversion; the torque sensor 12, measuring Z in real time The axial direction moment, and the restoring force in this direction is calculated according to the dimensional data of each part of the mechanical structure.
- the adjusting process is specifically: the control board first clears the register for storing the force/torque sensor information, and reads the PID adjustment parameter set by the user, and the user sets the currently expected restoring force value;
- the force feedback handle control system is in the initial adjustment phase.
- the force/torque sensor detects the return force output of the current handle in three directions and uses it as a feedback joint; the difference between the user input value and the feedback link acts on the input of the PID controller, and the value has passed.
- the control board solves it.
- the invention has the beneficial effects that the invention adopts a non-coupling design method on the mechanical structure design, the movements in three directions do not interfere with each other, and the recovery force is easily solved and controlled; and a tension spring and a torsion spring device can be realized.
- the automatic return function of the operating handle is simple in structure; the force/torque sensor is used to realize the real-time measurement of the restoring force of the operating handle, and as a feedback link and the user's desired restoring force, the PID adjustment method is used to stabilize the restoring force of the control handle in real time. .
- FIG. 1 is a schematic structural view of a force feedback handle of the present invention.
- FIG. 2 is a schematic flow chart of the method of the present invention.
- a three-dimensional force feedback handle restoring force control structure based on a force/torque sensor includes: a bottom plate 1, two side fixing frames 2, a triangular rib 3, a Y-axis motor 4, an X-axis motor 5, an inner frame. 6.
- the structure of the present invention includes a mechanical structure of a three-dimensional force feedback handle and a control module that realizes real-time control of the restoring force.
- the mechanical structure of the force feedback handle comprises a fixed base, a spring device for automatically returning the handle, a handle assisting mechanism and a rotating handle handle;
- the control module for real-time control of the restoring force comprises a real-time detecting force feedback handle three-dimensional reply
- the force/torque sensor is used to measure the current restoring force output in real time
- the PID control method is used to adjust the torque output of the force feedback motor
- the non-spring device is compensated in real time.
- Constant restoring force using the PID controller to adjust the characteristics, can quickly and stably control the handle restoring force output, eliminate the non-constant interference of the spring due to the change of the tensile length (torsion), and provide stable and reliable force feedback for the handle operator. Training effect.
- the fixed structure of the handle mechanical structure comprises: a bottom plate 1 and two side fixing frames 2, and the bottom plate 1 and the two side fixing frames 2 are screwed together and are reinforced by a triangular rib 3 .
- the mechanical structure of the three-dimensional force feedback handle has three degrees of uncoupled degrees of freedom.
- the X-axis and the Z-axis intersect at one point and are connected to the center point of the inner frame 4 through bearings.
- the two ends of the inner frame 4 are connected to the two-side fixing frame 2 through bearings.
- the operating handle can freely rotate around the bearing at both ends of the inner frame or the center point of the inner frame to form three rotational degrees of freedom of the X, Y and Z axes of the handle mechanism.
- the spring device for automatically returning the handle includes a tension spring 8 mounted directly below the Z-axis motor 9, and a torsion spring 11 mounted in the direction of rotation of the Z-axis of the handle and coaxial therewith.
- the control module that realizes the real-time control of the recovery force is essentially a closed loop of the restoring force control.
- the force/torque sensor comprises a three-dimensional force sensor 7 mounted on the handle fixing base plate 1 and coaxial with the Z-axis motor 9 and connected by a hook; the torque sensor 12 is mounted on the outside of the torsion spring 11 and the Z-axis Coaxial, real-time measurement of the torsional moment in the Z-axis direction.
- the torque motor of the restoring force generated by the compensation spring device compensates the spring device restoring force in the three directions of the handle on the X, Y, and Z axes, respectively, and outputs a stable and controllable torque.
- the invention relates to a three-dimensional force feedback handle restoring force control structure based on a force/torque sensor, comprising: a mechanical structure of a force feedback handle and a control module for real-time control of the restoring force.
- the mechanical structure comprises a fixed base, a spring device for automatically returning the handle, an auxiliary mechanism and a rotating handle;
- the control module for real-time control of the restoring force comprises a force/torque sensor for detecting the three-dimensional restoring force of the force feedback handle in real time, A torque motor that compensates for the restoring force generated by the spring device, and a PID controller that adjusts the restoring force output in real time.
- the fixed base comprises a square mounting bottom plate 1 and two vertical fixing frames 2, and the bottom plate and the fixing frame are reinforced by a triangular rib 3, and the two parts are screwed.
- a mounting hole is formed between the mounting hole of the upper end portion of the vertical fixing frame 2 on both sides and the rotating shaft of the inner frame 6 of the mechanism.
- the auxiliary mechanism includes a motor power transmission mechanism, and the X-axis motor 5 is fixed on one side of the two-side fixing frame, and the rotation direction is changed by using a bevel gear transmission; the Y-axis motor 4 is mounted on one side of the inner frame 6 of the handle mechanism. Similar to the X-axis, the bevel gear structure is used to change the direction of rotation of the mechanism. At the same time, in order to maintain the center of gravity of the entire handle mechanism at the center of the mechanism, a matching position is added to the symmetrical position of the X-axis motor 5 with respect to the center of the handle.
- the weight mechanism 10; the Z-axis direction is the rotation direction of the handle, so it is not necessary to change the driving direction of the driving shaft, and the Z-axis motor 9 is directly mounted perpendicular to the bottom plate and connected to the handle handle 13.
- the spring device for realizing the automatic return function of the handle mechanism when the motor does not output a torque acting on the handle, the spring device for realizing the automatic return function of the handle mechanism includes a tension spring 8 and a torsion spring 11.
- the hook at one end of the tension spring 8 is connected to a pull ring of the three-dimensional force sensor 7 mounted in the center of the fixed base plate of the handle mechanism, and both are mounted coaxially with the Z-axis motor 9, that is, perpendicular to the fixed base plate 1.
- the automatic spring returning characteristic of the tension spring will generate a pulling force for returning the handle mechanism to the initial state, which is expressed as the restoring force of the handle when the handle is conveyed by the handle mechanism.
- the torsion spring 11 mounted coaxially with the Z-axis motor 9 generates an automatic resetting force when the handle handle 13 rotates clockwise and counterclockwise, forcing the handle to automatically reset, and the torque sensor 12 detects the torque output in the Z-axis direction in real time.
- the above-mentioned control module for real-time control of the restoring force includes force/torque sensors 7 and 12 for acquiring three degrees of freedom directional force/torque information, a torque motor, and a control panel for realizing force/torque information acquisition.
- the force feedback handle restoring force control method uses the current user input desired restoring force and the current handle restoring force output as the input of the PID controller.
- the proportional, integral, and differential links are used for the current
- the restoring force output of the handle is quickly adjusted so that the output of the handle restoring force tracks the desired input value. If the current handle feedback force output value (ie, the feedback value) is consistent with the expected input value, the handle restoring force stable tracking input will be realized, that is, when the operating handle handle is freely pushed and pulled and rotated in space, the torque motor and the spring device work together.
- the restoring force is constant, and the stable control of the restoring force of the force feedback handle is realized.
- the PID controller for adjusting the torque output of the motor adopts the adjustment control strategy of proportional (P), integral (I) and differential (D), according to the expected restoring force input by the user and the response of the current handle measured by the force/torque sensor.
- the force output value is solved and the two are used as the input of the PID controller in the error form to adjust the real-time torque output of the three torque motors.
- the restoring force of the handle can track the user input expected value
- the input of the PID controller will be zero. That is, the restoring force of the handle is consistent with the input desired value, and the handle recovery force is stable and controllable.
- the control board After the three-dimensional automatic reset force feedback handle device of the present invention is powered on, the control board first clears the register for storing the force/torque sensor information, and reads the PID adjustment parameter set by the user, and the user sets the current desired recovery force value;
- the whole force feedback handle control system is in the initial adjustment stage.
- the force/torque sensor detects the return force output of the current handle in three directions and uses it as a feedback joint.
- the difference between the user input value and the feedback link acts on the input of the PID controller. It is solved by the control panel.
- the handle force feedback output can be stably tracked, the system will continue to work normally, providing a stable and reliable force feedback experience for the handle operator.
Abstract
Description
Claims (6)
- 一种基于力/力矩传感器的三维力反馈手柄回复力控制结构,其特征在于,包括:底板(1)、两侧固定架(2)、三角板筋(3)、Y轴电机(4)、X轴电机(5)、内框(6)、三维力传感器(7)、拉伸弹簧(8)、Z轴电机(9)、配重机构(10)、扭转弹簧(11)、力矩传感器(12)和手柄把手(13);底板(1)和两侧固定架(2)之间采用螺钉连接,并采用三角板筋(3)进行加固,三者共同构成了手柄结构固定基座;X轴电机(5)与Z轴电机(9)轴线相交于一点并与Y轴电机(4)中心点通过轴承连接,Y轴电机(4)两端与两侧固定架(2)通过轴承连接;两侧固定架(2)上端部分的安装孔与内框(6)转轴之间轴承连接,与X轴电机(5)安装位置相对于手柄整个机构中心的对称位置设置一个配重机构(10);三维力传感器(7)安装在手柄结构固定基座底板(1)的中央,沿Z轴电机(9)末端垂直方向与拉伸弹簧(8)相连接;力矩传感器(12)安装在手柄Z轴旋转方向上,Z轴电机(9)与底板(1)垂直安装,并与手柄把手(13)相连接。
- 如权利要求1所述的基于力/力矩传感器的三维力反馈手柄回复力控制结构,其特征在于,控制结构采用三个自由度非耦合的结构,利用伞齿轮改变动力传动方向。
- 如权利要求1所述的基于力/力矩传感器的三维力反馈手柄回复力控制结构,其特征在于,拉伸弹簧(8)和扭转弹簧(11)组成弹簧装置,该弹簧装置产生的回复力由X轴电机(5)、Y轴电机(4)和Z轴电机(9)三个力矩电机对其进行补偿,且力矩电机力矩输出大小可控,与手柄机械结构中的弹簧装置共同为手柄的不同空间运动位置输出回复力。
- 一种基于力/力矩传感器的三维力反馈手柄回复力控制方法,其特征在于,包括如下步骤:(1)三维力传感器(7)和力矩传感器(12)对力反馈手柄的三个方向上的回复力实时检测;(2)将当前用户输入期望回复力与当前手柄各自由度回复力输出差值作为PID控制器的输入;(3)在调节过程中,利用比例、积分、微分环节对当前的手柄的回复力输出迅速调整,使得手柄回复力的输出跟踪期望输入值;(4)若当前的手柄回复力输出值与期望输入值一致时,将实现手柄回复力稳定跟踪输入,即操作手柄把手在空间上自由推拉、旋转时,力矩电机与弹簧装置共同作用产生的 回复力恒定,实现力反馈手柄回复力的稳定控制。
- 如权利要求4所述的基于力/力矩传感器的三维力反馈手柄回复力控制方法,其特征在于,步骤(1)中,对回复力进行实时检测具体为:根据三维力传感器(7)测量结果,利用力的矢量分解,得到X、Y轴反向上的回复力;力矩传感器(12),实时测量Z轴方向力矩,并根据机械结构的各部分尺寸数据计算该方向上的回复力。
- 如权利要求4所述的基于力/力矩传感器的三维力反馈手柄回复力控制方法,其特征在于,步骤(3)中,调整的过程具体为:控制板首先对存储力/力矩传感器信息的寄存器清零,并读取用户设置的PID调节参数,用户设置当前期望的回复力值;整个力反馈手柄控制系统处于初始调节阶段,力/力矩传感器实时检测当前手柄三个方向的回复力输出并作为反馈关节;用户输入值与反馈环节之差作用于PID控制器的输入,该值已通过控制板对其进行解算。
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CN107560777B (zh) * | 2017-07-31 | 2019-07-30 | 东南大学 | 基于力/力矩传感器的三维力反馈手柄回复力控制结构及方法 |
CN108553116B (zh) * | 2018-05-16 | 2023-08-08 | 复旦大学附属金山医院 | 一种成人前臂旋转力量测量仪 |
CN110667289B (zh) * | 2019-10-16 | 2020-12-29 | 浙江大学软件学院(宁波)管理中心(宁波软件教育中心) | 一种基于力反馈的木雕自适应控制装置及方法 |
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CN107560777A (zh) * | 2017-07-31 | 2018-01-09 | 东南大学 | 基于力/力矩传感器的三维力反馈手柄回复力控制结构及方法 |
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