Design of warp knitting electronic shogging system based on mixed-velocity planning curve

Zheng, Baoping; Jiang, Gaoming; Dong, Zhen; Liu, Haisang

doi:10.1177/0040517520982583

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…In this study, a deep deterministic policy gradient (HM-DD PG) algorithm based on Hierarchical Memory (HM) is cons tructed for the application of deep reinforcement learning in complex scenarios in the textile industry [31] and successfull y integrated with positive kinematics for solving the proble m of successive multi-segment trajectory planning of a robo tic arm.…”

Section: Discussionmentioning

confidence: 99%

Robotic Arm Trajectory Planning Method Using Deep Deterministic Policy Gradient With Hierarchical Memory Structure

Zhao,

Ding,

et al. 2023

IEEE Access

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Traditional robotic arm path planning methods are mainly carried out in the tool center point operation space, and frequently solve inverse kinematics problems, thus consuming a large number of computational resources. In contrast, using positive kinematics for planning in the joint space not only improves the efficiency, but its analytic solution also has higher accuracy. In order to better cover the environmental state space, this paper adopts the full-preserving experience preservation approach. In order to realize fast and efficient sampling of high reward value experience, this study constructs an innovative hierarchical memory structure and eliminates the overfitting phenomenon that may be caused by biased sampling through the Bias-Free strategy. Experimentally validated in the continuous path planning task of a textile robot arm, the proposed hierarchical memory deep deterministic gradient strategy method (HM-DDPG) demonstrates excellent performance and practicality in the textile robot arm path planning problem.

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Section: Discussionmentioning

confidence: 99%

Robotic Arm Trajectory Planning Method Using Deep Deterministic Policy Gradient With Hierarchical Memory Structure

Zhao,

Ding,

et al. 2023

IEEE Access

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“…Next, the opening, weft insertion, beating, and other actions are performed according to the spindle angle of the rapier loom. 16,17 Then, the fabric begins to form. Finally, the formed fabric passes the friction roller and is wound into a roll by the cloth beam.…”

Section: Analysis Of Influences and Solutions On Warp Tensionmentioning

confidence: 99%

Optimal analysis and application of the warp tension control system for a rapier loom

Xiao

Zhang

Liu

et al. 2021

Textile Research Journal

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Traditional proportional–integral–derivative (PID) control performance optimization is an essential method to improve a loom’s warp tension control performance. This work proposes an improved genetic algorithm optimized PID control scheme to overcome the decline in control performance of the traditional PID control algorithm in a loom’s warp tension control system. Through the decoupling analysis of loom motion mechanism, the establishment of warp tension model and the optimization of fitness evaluation mechanism of genetic algorithm can effectively overcome the problems of local optimal solution and algorithm degradation of genetic algorithm. Simulation experiments were carried out with the traditional PID, the integral separation PID, and the genetic PID in warp tension control. The results show the advantage of the genetic-PID algorithm to control warp tension stability. Ultimately, according to the functional characteristics of the loom mechanism, a tension control platform for experimental studies was established. The test results show that the maximum fluctuation range of warp tension is within [−2, +6] at the test speed of 850 rpm, which meets the requirements of long-term stable and reliable control of warp tension under different weaving conditions.

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Modified Drive Structure of a Knitting Machine

2022

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This paper deals with the problematic of the drive system of small-diameter knitting machines (hereinafter “knitting machines”). An alternative design of a new drive system is presented that addresses the effective working position of selected operating elements, i.e., a cylinder, a dial, and a roller cutter. The design is protected by patent No. 303578, and the authors of this paper also authored the patent. For the description and simulation of the drive system, mathematical models have been elaborated of the existing and new drive system, which include an additional design of a more suitable stroke for the movement of the cylinder. The output of the simulations are the courses of kinematic quantities, torque, and electric current, elucidating the benefits of the new drive system. Based on the structure of the new drive system, a test device has been designed and manufactured to verify functionality and reliability. The new drive system consumes less energy, simplifies the machine frame and reduces noise emissions. The obtained results can help in researching the issue of knitting machine frames, and in addition, the new system brings new technological possibilities for knitting.

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Design of warp knitting electronic shogging system based on mixed-velocity planning curve

Cited by 3 publications

References 22 publications

Robotic Arm Trajectory Planning Method Using Deep Deterministic Policy Gradient With Hierarchical Memory Structure

Robotic Arm Trajectory Planning Method Using Deep Deterministic Policy Gradient With Hierarchical Memory Structure

Optimal analysis and application of the warp tension control system for a rapier loom

Modified Drive Structure of a Knitting Machine

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