针对海上漂浮式风力机在风浪激励下产生较大振动响应的问题,采用混合质量阻尼器(Hybrid mass damper, HMD)主动控制系统抑制风力机的结构振动。基于拉格朗日能量方程建立Spar式风力机的气动-水动-结构-调谐质量阻尼器(Tunedmass damper,...针对海上漂浮式风力机在风浪激励下产生较大振动响应的问题,采用混合质量阻尼器(Hybrid mass damper, HMD)主动控制系统抑制风力机的结构振动。基于拉格朗日能量方程建立Spar式风力机的气动-水动-结构-调谐质量阻尼器(Tunedmass damper, TMD)-HMD耦合动力学模型,并采用遗传算法优化TMD的刚度和阻尼系数;在机舱TMD上施加主动控制力,设计了变增益状态反馈H∞控制器,将控制器的求解问题转化为线性矩阵不等式的优化问题,从而得到最优主动控制力;研究了不同工况下HMD主动控制系统对风力机的减振效果。结果表明,相对于TMD被动控制系统,HMD主动控制系统能够进一步降低风力机的平台纵摇(Platform pitch, PFPI)运动和塔顶纵向(Tower top fore-aft, TTFA)挠度。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
An interactive boundary-layer method, which solves the unsteady flow, is developed for aeroelastic computation in the time domain. The coupled method combines the Euler solver with the integral boundary-layer solver ...An interactive boundary-layer method, which solves the unsteady flow, is developed for aeroelastic computation in the time domain. The coupled method combines the Euler solver with the integral boundary-layer solver （Euler/BL） in a ＂semi-inverse＂ manner to compute flows with the inviscid and viscous interaction. Unsteady boundary conditions on moving surfaces are taken into account by utilizing the approximate small-perturbation method without moving the computational grids. The steady and unsteady flow calculations for the LANN wing are presented. The wing tip displacement of high Reynolds number aero-structural dynamics （HIRENASD） Project is simulated under different angles of attack. The flutter-boundary predictions for the AGARD 445.6 wing are provided. The results of the interactive boundary-layer method are compared with those of the Euler method and experimental data. The study shows that viscous effects are significant for these cases and the further data analysis confirms the validity and practicability of the coupled method.展开更多
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%。
基金co-supported by the National Natural Science Foundation of China (No.51675426)Aerospace Science and Technology Innovation Fund of China (No.2014KC010043)
文摘An interactive boundary-layer method, which solves the unsteady flow, is developed for aeroelastic computation in the time domain. The coupled method combines the Euler solver with the integral boundary-layer solver （Euler/BL） in a ＂semi-inverse＂ manner to compute flows with the inviscid and viscous interaction. Unsteady boundary conditions on moving surfaces are taken into account by utilizing the approximate small-perturbation method without moving the computational grids. The steady and unsteady flow calculations for the LANN wing are presented. The wing tip displacement of high Reynolds number aero-structural dynamics （HIRENASD） Project is simulated under different angles of attack. The flutter-boundary predictions for the AGARD 445.6 wing are provided. The results of the interactive boundary-layer method are compared with those of the Euler method and experimental data. The study shows that viscous effects are significant for these cases and the further data analysis confirms the validity and practicability of the coupled method.
