The control force, feedback gain, and actuator stroke of several active vibration isolation systems were analyzed based on a single-layer active vibration isolation system. The analysis shows that the feedback gain an...The control force, feedback gain, and actuator stroke of several active vibration isolation systems were analyzed based on a single-layer active vibration isolation system. The analysis shows that the feedback gain and actuator stroke cannot be selected independently and the active isolation system design must make a compromise between the feedback gain and actuator stroke. The performance of active isolation systems can be improved by the joint vibration reduction using an active vibration isolation system with an adaptive dynamic vibration absorber. The results show that the joint vibration reduction method can successfully avoid the compromise between the feedback gain and actuator stroke. The control force and the object vibration amplitude are also greatly reduced.展开更多
在恶劣的海洋环境中,随机风浪载荷使风机平台和塔顶产生较大的振动位移,严重威胁风机结构的安全性。为此提出TMD-HMD主被动综合控制方法对海上浮式风力机进行振动控制,在Spar式浮动风力机平台内放置多个调谐质量阻尼器,构成多重调谐质...在恶劣的海洋环境中,随机风浪载荷使风机平台和塔顶产生较大的振动位移,严重威胁风机结构的安全性。为此提出TMD-HMD主被动综合控制方法对海上浮式风力机进行振动控制,在Spar式浮动风力机平台内放置多个调谐质量阻尼器,构成多重调谐质量阻尼器(Multiple tuned mass damper,MTMD),在机舱内放置一个调谐质量阻尼器(Tuned mass damper,TMD)。首先基于欧拉-拉格朗日能量方程建立了风机系统11自由度空间动力学简化模型,利用Levenberg-Marquardt算法估计平台的刚度和阻尼参数,并通过与美国可再生实验室开发的FAST全耦合模型对比验证了模型的正确性;然后采用Van-Nguyen Dinh的方法优化了TMD的参数;接着在机舱TMD上施加主动控制力形成混合质量阻尼器(Hybrid mass damper,HMD),与平台TMD共同构成TMD-HMD综合振动控制系统,其中主动控制力通过线性二次型控制(Linear quadratic regulator,LQR)获得,LQR中的权重系数Q和R采用穷举法优化;最后在风浪联合载荷下分别研究了TMD被动控制和TMD-HMD主被动综合控制对风机动态响应的抑制效果。结果表明:与单独TMD被动控制相比,TMD-HMD主被动综合控制对风机平台纵摇角和塔顶纵向位移的抑制效果分别提高了约38%和20%,使其振动能量分别减少了72%和40%。展开更多
文摘The control force, feedback gain, and actuator stroke of several active vibration isolation systems were analyzed based on a single-layer active vibration isolation system. The analysis shows that the feedback gain and actuator stroke cannot be selected independently and the active isolation system design must make a compromise between the feedback gain and actuator stroke. The performance of active isolation systems can be improved by the joint vibration reduction using an active vibration isolation system with an adaptive dynamic vibration absorber. The results show that the joint vibration reduction method can successfully avoid the compromise between the feedback gain and actuator stroke. The control force and the object vibration amplitude are also greatly reduced.
文摘在恶劣的海洋环境中,随机风浪载荷使风机平台和塔顶产生较大的振动位移,严重威胁风机结构的安全性。为此提出TMD-HMD主被动综合控制方法对海上浮式风力机进行振动控制,在Spar式浮动风力机平台内放置多个调谐质量阻尼器,构成多重调谐质量阻尼器(Multiple tuned mass damper,MTMD),在机舱内放置一个调谐质量阻尼器(Tuned mass damper,TMD)。首先基于欧拉-拉格朗日能量方程建立了风机系统11自由度空间动力学简化模型,利用Levenberg-Marquardt算法估计平台的刚度和阻尼参数,并通过与美国可再生实验室开发的FAST全耦合模型对比验证了模型的正确性;然后采用Van-Nguyen Dinh的方法优化了TMD的参数;接着在机舱TMD上施加主动控制力形成混合质量阻尼器(Hybrid mass damper,HMD),与平台TMD共同构成TMD-HMD综合振动控制系统,其中主动控制力通过线性二次型控制(Linear quadratic regulator,LQR)获得,LQR中的权重系数Q和R采用穷举法优化;最后在风浪联合载荷下分别研究了TMD被动控制和TMD-HMD主被动综合控制对风机动态响应的抑制效果。结果表明:与单独TMD被动控制相比,TMD-HMD主被动综合控制对风机平台纵摇角和塔顶纵向位移的抑制效果分别提高了约38%和20%,使其振动能量分别减少了72%和40%。