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Nonlinear model predictive trajectory tracking for valve-controlled cylinder with counterbalance valve |
Qi WEI( ),Jianfeng TAO*( ),Hao SUN,Yulei ZHANG,Chengliang LIU |
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract A nonlinear model predictive control (NMPC) method for trajectory tracking was proposed to address instability issues in valve-controlled cylinders with counterbalance valves. An affine nonlinear state-space model was derived through transformation and simplification based on the differential-algebraic equation model. Partial feedback linearization was used to derive the zero dynamics, revealing that the difficulty in analytically obtaining stability conditions for zero dynamics was the fundamental reason to global stabilization in systems with counterbalance valves. A local control Lyapunov function (CLF) was constructed to resolve this difficulty in order to prove the local stabilizability of the system. A NMPC controller was developed. A stabilization term for the counterbalance valve spool was incorporated in the cost function. Terminal cost and constraints were designed by using CLF level set in order to ensure the local asymptotic stability of the controller. The proposed method reduced oscillation amplitude by an average of 88.19% under a 240 kg terminal load while maintaining the same level of trajectory tracking error compared with traditional feedforward-feedback control in experiments. The proposed method achieves high tracking accuracy while ensuring stability.
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Received: 03 July 2024
Published: 28 July 2025
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Fund: 国家自然科学基金资助项目(52075320). |
Corresponding Authors:
Jianfeng TAO
E-mail: v7sjtu@sjtu.edu.cn;jftao@sjtu.edu.cn
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含平衡阀阀控缸的非线性模型预测轨迹跟踪
为了解决含平衡阀阀控缸系统轨迹跟踪控制易失稳振荡的问题,提出非线性模型预测控制(NMPC)的轨迹跟踪方法. 基于含平衡阀阀控缸系统的微分-代数方程模型,通过方程变换与合理简化,构建仿射非线性状态空间模型. 通过部分反馈线性化分析该模型,分离出系统的零动态,揭示了含平衡阀系统难以全局镇定的根源,即零动态稳定性条件不易解析获取. 为了解决该难题,构造局部控制Lyapunov函数(CLF),证明系统具有局部可镇定性. 提出NMPC控制器,在优化代价函数中增加平衡阀阀芯镇定项,利用CLF水平集设计终端代价与终端不等约束,保证NMPC的局部渐近稳定性. 与传统的模型前馈-反馈控制进行实验对比,在同等的轨迹跟踪误差水平下,提出方法在240 kg末端负载下的振动振幅平均下降88.19%,证明利用提出方法,可以在保证稳定性的基础上具有较高的轨迹跟踪精度.
关键词:
平衡阀,
阀控液压缸,
非线性模型预测控制,
轨迹跟踪,
振动抑制
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