CAJ | 학술논문

基于遗传算法对层合板结构辐射声功率最小化进行铺设角优化；利用分层有限元模型求解层合板固有频率及振速分布；通过声辐射模态理论计算结构辐射声功率。以铺设角作为设计变量、辐射声功率作为优化变量，分别以某4层、8层层合板结构为例，研究不同频率时声功率最小化对应的优化铺设角。数值分析结果表明，在同一优化铺设角下，优化后第一阶声功率与辐射总声功率差别不大；对相同层合板结构而言，随频率增加声功率优化量增大；相同厚度下层合板铺设层越多声辐射功率优化量越小。
기우유전산법대층합판결구복사성공솔최소화진행포설각우화；이용분층유한원모형구해층합판고유빈솔급진속분포；통과성복사모태이론계산결구복사성공솔。이포설각작위설계변량、복사성공솔작위우화변량，분별이모4층、8층층합판결구위례，연구불동빈솔시성공솔최소화대응적우화포설각。수치분석결과표명，재동일우화포설각하，우화후제일계성공솔여복사총성공솔차별불대；대상동층합판결구이언，수빈솔증가성공솔우화량증대；상동후도하층합판포설층월다성복사공솔우화량월소。
An optimization method to minimize the sound power of laminated composite plate based on genetic algorithm was presented.A layerwise finite element model was imposed to determine the natural frequencies and velocity distributions of laminated composite plates.Based on the theory of acoustic radiation mode,the radiated sound power was calculated.A four-layer and an eight-layer laminated plate were used as examples,the fiber orientation angles were taken as design variables and the minimization of sound power was chosen as design objective.The optimal orientation angles to achieve sound power minimization were discussed under different frequencies.The numerical simulations show that the first order sound power and the total sound power are basically identical under the same optimum orientation angle.For laminated composite plates with the same structure,the optimal amount of radiated sound power increases with the increase of vibration frequency.And for laminated composite plates,with the same thickness,the optimal amount of radiated sound power is smaller,the more the layer number of the plate.