摘要
基于线性黏弹性假设,将应变能阻尼理论推广到复合隔振系统的等效模态阻尼计算中,运用Python和Abaqus编制相应的计算程序,该程序可考虑材料阻尼的频变特性。以多种材料组成的船舶双层复合隔振系统为算例,计算其等效模态阻尼和隔振器等效阻尼系数。分别采用直接积分法和模态叠加法计算系统振动响应,对比设备、筏架、船底壳的振动加速度响应,验证基于等效模态阻尼的模态叠加法的准确性。结果表明,该方法可以准确计算复杂组合模型的模态阻尼,算例的振动响应计算结果一致性较好,用模态叠加法可以大幅提高复合隔振系统稳态振动响应的计算效率。
Based on the linear viscoelastic assumption,the strain energy damping theory is extended to the equivalent modal damping calculation of the composite vibration isolation system.The calculation program is compiled using Python and Abaqus,in which the frequency-dependent characteristic of material damping is taken into account.A ship double-layer vibration isolation system composed of multiple materials is used as an calculation example.The equivalent modal damping of the system and the equivalent damping coefficient of the isolator are calculated.The system vibration response is calculated respectively by the direct integration method and the modal superposition method,and the vibration acceleration responses on the equipment,truss and hull shell are compared.The accuracy of the modal superposition method based on the equivalent modal damping is verified.The results show that:the modal damping of complex combined models can be calculated accurately;the vibration responses of the calculation example agree well with each other;the computational efficiency of the steady-state vibration response of the composite vibration isolation systems can be greatly improved using the modal superposition method.
作者
吴健
李泽成
何涛
王纬波
WU Jian;LI Zecheng;HE Tao;WANG Weibo(National Key Laboratory on Ship Vibration&Noise,China Ship Scientific Research Center,Wuxi 214082,Jiangsu,China;Jiangsu Key Laboratory of Green Ship Technology,Wuxi 214082,Jiangsu,China)
出处
《计算机辅助工程》
2019年第4期37-41,共5页
Computer Aided Engineering
基金
工信部高技术船舶科研项目(工信部联装2016[546]、2016[24]、2016[548])
关键词
振动响应
阻尼
应变能
模态叠加
直接积分
vibration response
damping
strain energy
modal superposition
direct integration
