基于DDPG动态补偿的压机位置伺服控制

Press position servo control based on DDPG dynamic compensation

  • 摘要: 在芯片封装过程中,传统 PID 控制应用于伺服压机控制器时,虽能达成基础稳定控制,但存在参数整定依赖经验、动态适应性不足的问题,难以处理伺服压机封装过程中的非线性、参数变化等复杂状况。为使伺服压机适应实际应用环境,提高位置跟踪精度,实现精确控制,创新性地将深度强化学习引入伺服压机控制模型,采用深度确定性策略梯度(deep deterministic policy gradient, DDPG)算法,并构建自适应动态补偿机制实现参数优化。仿真试验结果表明,与传统PID控制相比,所构建的基于DDPG的动态补偿控制策略在标称情况、大摩擦工况、宽齿隙工况与带有随机扰动的工况下的误差范围分别降低了91.70%、94.09%、85.38%以及87.57%,显著提高系统模型的跟踪性能与较强的抗干扰能力。仿真试验结果充分验证了所提方法的有效性。

     

    Abstract: In the chip packaging process, traditional PID control applied to servo press controllers can achieve basic stable control, but it relies on experience for parameter tuning and lacks dynamic adaptability, making it difficult to handle the complex conditions of nonlinearity and parameter changes in the servo press packaging process. To enable the servo press to adapt to real-world application environments, improve position tracking accuracy, and achieve precise control, deep reinforcement learning is innovatively incorporated into the servo press control model, the deep deterministic policy gradient (DDPG) algorithm is employed, and an adaptive dynamic compensation mechanism is established to optimize parameters. Simulation results show that compared to traditional PID control, the DDPG based dynamic compensation control strategy reduces error ranges by 91.70%, 94.09%, 85.38%, and 87.57% under nominal, high-friction, wide-clearance, and random disturbance conditions, respectively, demonstrating significant improvements in tracking performance and disturbance resistance. The simulation experiment results fully validate the effectiveness of the proposed method.

     

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