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公开(公告)号：US11992959B1
公开(公告)日：2024-05-28
申请号：US18402139
申请日：2024-01-02
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Guoqing Wu , Zhuojun Zheng , Lanyu Zhang , Yuheng Luo , Disai Chen , Xin Chen
CPC classification number: B25J9/1692 , G06T7/70 , G06T2207/30244
Abstract: A kinematics-free hand-eye calibration method comprises: controlling translation axes of a five-axis motion platform to perform a single-axis point location motion, using a camera to obtain a first spatial coordinate of a calibration plate, fitting all first spatial coordinates into a spatial straight line to obtain a unit direction vectors of the spatial straight line, carrying out Schmidt orthogonalization on the unit direction vectors of the spatial straight lines of an X direction, a Y direction and a Z direction to obtain a pose relationship matrix combined by the orthogonalized direction vectors; obtaining a second spatial coordinate of the calibration plate in a mode of rotating an X-axis and a C-axis, fitting all second spatial coordinates into a spatial spherical surface, calculating a spherical center coordinate to obtain a position relationship matrix, and obtaining a hand-eye relationship matrix combined by the pose relationship matrix and the position relationship matrix.
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公开(公告)号：US11994838B1
公开(公告)日：2024-05-28
申请号：US18583904
申请日：2024-02-22
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Guixin Zhang , Yuheng Luo , Lanyu Zhang , Haixiang Deng , Yun Chen , Xin Chen
IPC: G05B19/4103
CPC classification number: G05B19/4103 , G05B2219/34169
Abstract: A five-axis linkage synchronous tool path interpolation method and system, which utilizes the strict proportional coefficient relationship between points, control points and parameters on the first-order derivative curve of the spline curve, more accurate tool axis path curve interpolation points from the parameters of the tool tip path curve are calculated. There is no need to calculate the tool axis path curve interpolation points according to interval synchronization. It is not affected by the shape consistency of the tool tip path curve and the tool axis path curve.
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公开(公告)号：US11919177B1
公开(公告)日：2024-03-05
申请号：US18482887
申请日：2023-10-08
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Zhenyu Zheng , Zhuojun Zheng , Lanyu Zhang , Yuheng Luo , Haixiang Deng , Xin Chen
IPC: B25J9/16
CPC classification number: B25J9/1694 , B25J9/1697
Abstract: A tracking measurement method, apparatus and device for a pose of a tail end of a manipulator. The method comprises: shooting a first calibration board mounted at the tail end of the manipulator by a monocular measurement camera, acquiring multiple sets of first transformation matrices, and mounting the monocular measurement camera on a pitch axis of a pan-tilt; shooting a second calibration board by a global camera, and acquiring multiple sets of second transformation matrices; when a calibration center of the first calibration board is in a center of a field of view of the monocular measurement camera, calculating a measured pose of the tail end of the manipulator; and when the calibration center of the first calibration board deviates from the center of the field of view of the monocular measurement camera, calculating a direction deviation angle, and adjusting the pitch axis and a horizontal axis of the pan-tilt.
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4.发明授权公开(公告)号：US11959743B1
公开(公告)日：2024-04-16
申请号：US18482870
申请日：2023-10-07
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Disai Chen , Yuheng Luo , Lanyu Zhang , Zhuojun Zheng , Guoqing Wu , Xin Chen
CPC classification number: G01B9/02083 , G01C15/00 , G05B13/042
Abstract: A dimensionless kinematics calibration method based on a virtual point and a related apparatus thereof. The method comprises: establishing a kinematics model of a motion mechanism, and arranging a plurality of virtual points at a tail end of the motion mechanism to establish a dimensionless kinematics model and a dimensionless error model; converting a measurement coordinate system into a motion mechanism coordinate system, acquiring a rotation matrix and a translation matrix of a target virtual point measured by the measurement device, and calculating actual coordinates of all virtual points to obtain a measured value of the dimensionless kinematics model; calculating a theoretical value of the dimensionless kinematics model according to a spatial relationship between a reflecting head and the tail end of the motion mechanism; and optimizing the dimensionless error model according to the measured value and the theoretical value to obtain a calibration result.
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Patent Agency Ranking
5.发明授权公开(公告)号：US11569762B2
公开(公告)日：2023-01-31
申请号：US16950062
申请日：2020-11-17
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Jindi Zhang , Yuheng Luo , Lingwei Tan , Lanyu Zhang , Xin Chen
Abstract: The present disclosure relates to the technical field of mechanical precision manufacturing, in particular to a motor tracking error reduction method and an implementation device based on a micro-drive unit. A motor tracking error reduction method based on micro-drive unit includes: providing a motor mover as the working output end, and feeding back the position information of the motor mover to the micro-drive controller in real time by the sensor; controlling the micro-drive unit to compensate the displacement of the motor mover by the micro-drive controller; correcting the tracking error of the motor mover after the displacement compensation, and feeding back the tracking error information after correction to the motor controller. The error reduction method and implementation device in the present disclosure reduce the motor tracking error and solve the problem of coupling interference. In addition, the single position feedback is used to reduce the production cost.
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6.发明授权公开(公告)号：US12183048B2
公开(公告)日：2024-12-31
申请号：US18767924
申请日：2024-07-09
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Junlang Liang , Lanyu Zhang , Yuheng Luo , Zhuojun Zheng , Xin Chen
Abstract: The present application provides an image stitching method, apparatus and device based on reinforcement learning and a storage medium. The method includes: acquiring initial calibration parameters, collecting a sample image and position information of a motion platform; setting a negative reward function; acquiring a state set and a negative reward value set according to a randomly generated action set, the initial calibration parameters, the position information of the motion platform and the negative reward function to construct a probability kinematics model; constructing a state value function based on an occurrence probability of the state, and acquiring an optimal action by optimizing the state value function; and acquiring optimized calibration parameters through the optimal action and the initial calibration parameters, and carrying out image stitching on corresponding sample images through the optimized calibration parameters. The application solves the technical problem of low image stitching quality in the prior art.
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公开(公告)号：US12106999B2
公开(公告)日：2024-10-01
申请号：US17229017
申请日：2021-04-13
Applicant: Guangdong University of Technology
Inventor： Jian Gao , Wenxiu Lai , Guocong Chen , Lanyu Zhang , Yachao Liu , Yongbin Zhong , Yuheng Luo , Huawen Lin
IPC: H01L21/687 , H01L21/68 , H01L25/075
CPC classification number: H01L21/68764 , H01L21/68 , H01L21/68757 , H01L25/0753
Abstract: A decoupled XY parallel micro-positioning stage, including a central moving platform, fixed mechanisms, bridge-type micro-displacement amplification mechanisms, a four-bar symmetrical flexible guide mechanism and a piezoelectric ceramic. Each fixed mechanism is arranged between adjacent amplification mechanisms and is symmetrical about X and Y axes centered on the moving platform. The amplification mechanism is symmetrically arranged with respect to the X and Y axes, and includes two first and second longitudinal beams and multiple crossbeams. The two first longitudinal beams are provided in parallel and spaced apart. The two second longitudinal beams are arranged spaced apart between the two first longitudinal beams, and are connected to the two first longitudinal beams via the crossbeams. The crossbeams are connected to the longitudinal beams via a flexible hinge. The piezoelectric ceramic is arranged between the two first longitudinal beams.
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公开(公告)号：US12138802B1
公开(公告)日：2024-11-12
申请号：US18769309
申请日：2024-07-10
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Disai Chen , Yuheng Luo , Lanyu Zhang , Zhuojun Zheng , Guoqing Wu , Xin Chen
IPC: B25J9/16
Abstract: The present application provides a kinematics modeling method, apparatus and device for a multi-degree-of-freedom mechanism and a storage medium. The method includes: constructing a point coordinate system, and constructing the transformation matrix; constructing transformation matrices of two rotating axes and the transformation matrix; constructing the forward kinematics model based on the transformation matrices of the point coordinate system, the two rotating axes and the workpiece coordinate system; solving the motor value of the rotating axis through the rotation matrix of the end-effector, using the translation matrix of the end-effector as a non-homogeneous linear equation set, solving the motor value of linear axis. Thus solving the technical problem in the prior arts that the redundant parameters are introduced as a cost to separate the linear axis and the rotating axis for step-by-step kinematics calibration, which affects the error calibration precision of the overall end-effector movement of the mechanism.
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公开(公告)号：US12109714B1
公开(公告)日：2024-10-08
申请号：US18483499
申请日：2023-10-09
Applicant: GUANGDONG UNIVERSITY OF TECHNOLOGY
Inventor： Jian Gao , Guoqing Wu , Yuheng Luo , Lanyu Zhang , Zhuojun Zheng , Disai Chen , Xin Chen
IPC: B25J9/16
CPC classification number: B25J9/1692 , B25J9/1697
Abstract: Disclosed are a kinematics parameter calibration method and system of a multi-axis motion platform. The method comprises the following steps of: collecting calibration board images in different spatial positions according to a position relation between the platform and a camera, recording a corresponding motor motion amount, solving a hand-eye pose relation matrix and a pose matrix of a calibration board coordinate system in a platform tail end coordinate system, further solving a coordinate measured value of an angular point on the calibration board in a platform base coordinate system and a coordinate theoretical value of a position matrix of the tail end of the motion platform, determining a residual error matrix according to the measured value and the theoretical value, and identifying an error parameter by the residual error matrix to complete kinematics parameter calibration of the platform.
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