课题组在 Nonlinear Dynamics 发表点吸收式波能转换器液压 PTO 非线性动力学研究，提出 Jenkins 型双线性滞回模型与非线性频域分析框架。
课题组关于点吸收式波能转换器液压功率提取系统（PTO）非线性动力学的研究成果已在线发表于 Nonlinear Dynamics。论文题为 Dynamics of point-absorber wave energy converters with bilinear hysteretic PTO damping，联合培养博士生辛传龙为第一作者，韦雁机助理教授为通讯作者。
研究针对传统库仑阻尼模型忽略液压系统有限串联刚度的问题，引入 Jenkins 型双线性滞回模型，并构建谐波平衡与交替频率—时间方法相结合的分析框架。该模型能够描述预滑移弹性、摩擦阈值以及路径相关的滞回响应。
结果表明，串联刚度与摩擦阈值会共同影响系统的粘滑转变、共振位置、幅频响应和能量捕获。低阶谐波平衡方法适合快速扫频与参数筛选，而在低频强非线性区域，高阶方法能更好地保留主要谐波贡献。
研究为液压 PTO 的快速性能评估、参数选择和优化设计提供了兼顾物理解释与计算效率的中间建模路径，也为后续原理样机、能量转换效率和控制策略研究提供了基础。
The lab has published a study in Nonlinear Dynamics on nonlinear dynamics of hydraulic power-take-off (PTO) systems for point-absorber wave energy converters. The paper, Dynamics of point-absorber wave energy converters with bilinear hysteretic PTO damping, lists jointly trained PhD researcher Chuanlong Xin as first author and Assistant Professor Yanji Wei as corresponding author.
The work addresses the finite series stiffness neglected by conventional Coulomb-damping simplifications. A Jenkins-type bilinear hysteretic model is introduced and coupled with harmonic-balance and alternating frequency-time approaches to represent pre-sliding elasticity, friction thresholds, and path-dependent hysteresis.
The results show that series stiffness and friction threshold jointly influence stick-slip transitions, resonance location, frequency response, and energy capture. Low-order harmonic balance is efficient for rapid frequency sweeps and parameter screening, while higher-order analysis better captures strong low-frequency nonlinearities.
The framework provides a computationally efficient, physically interpretable route for PTO performance assessment and parameter optimization, with future applications to prototype systems, conversion efficiency, and control strategies.
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