CAJ | 학술논문

针对基底层阻尼不可忽略的自由阻尼结构，考虑基底层的拉伸变形，根据变形能理论和复刚度理论分别推导得到修正的损耗因子公式。而后利用ANSYS软件建立自由阻尼矩形板的实体模型并进行谐响应分析，分别通过变形能法和输入率法得到结构损耗因子的数值解。仿真对比表明，变形能法和复刚度法两种损耗因子修正公式的计算结果相吻合，结构损耗因子的两种有限元数值解均与修正公式的解析解相一致。研究表明，损耗因子修正公式是正确的，可用于一般基底层的自由阻尼类结构的损耗因子计算。
침대기저층조니불가홀략적자유조니결구，고필기저층적랍신변형，근거변형능이론화복강도이론분별추도득도수정적손모인자공식。이후이용ANSYS연건건립자유조니구형판적실체모형병진행해향응분석，분별통과변형능법화수입솔법득도결구손모인자적수치해。방진대비표명，변형능법화복강도법량충손모인자수정공식적계산결과상문합，결구손모인자적량충유한원수치해균여수정공식적해석해상일치。연구표명，손모인자수정공식시정학적，가용우일반기저층적자유조니류결구적손모인자계산。
For unconstrained damped (UD)structures whose base layer’s damping can not be neglected,revised loss factor formulas were derived based on the strain energy method (SEM)and complex stiffness method (CSM)with the base layer’s shear deformation considered.Solid models of UD rectangle plates were developed with ANSYS and based on the model,a harmonic analysis was done.The numerical solutions of structural loss factors were obtained by using the input power method and SEM.The simulation results show that analytical solutions by SEM and CSM are coincident and are in good agreement with the numerical solutions by two FEA methods.The research demonstrates the revised loss factor formulas are correct and benefitial to improve the prediction of UD structures’ damping characteristics.