考虑基础柔性的隔振系统功率流特性分析

Study on power flow characteristics of isolation system based on flexible foundation

根据舰船机械设备安装特性及隔振要求,建立包含机械设备、隔振器和柔性基础的数学模型并对其求解,得到隔振系统在简谐激励下的响应及传递功率流计算公式,讨论了隔振系统中设备质量、隔振器刚度和阻尼、柔性基础刚度和阻尼等参数对隔振能力的影响。理论表明,适当增大机械设备质量、隔振器阻尼及柔性基础阻尼能提高系统隔振能力,较大的隔振器刚度不利于隔振,而基础板柔性对隔振系统的影响与激励频率有关,并给出了柔性基础隔振设计中参数选取的一般规律。

According to the installation standards and vibration isolation requirements of ship equipments, a mathematical model of vibration isolation system consisting of equipment, isolator and flexible foundation is developed and solved, and the response and power flow formula of the system under harmonic excitation are worked out. The effects that equipment mass, isolator stiffness and damping as well as flexible foundation stiffness and damping have on the performance of the isolation system is discussed. As theoretical results show, it enhances the performance of the system to properly increase equipment mass, isolator damping or flexible foundation damping; larger isolator stiffness is not beneficial to vibration isolation; the effect of flexible foundation stiffness is related to excitation frequency. General principles of the design of vibration isolation based on flexible foundation is put forward.