收稿日期: 2016-12-09
修回日期: 2017-04-19
网络出版日期: 2017-04-19
基金资助
国家自然科学基金(11472216)
Vibration and acoustic radiation characteristics analysis of composite laminated plate in hygrothermal environments
Received date: 2016-12-09
Revised date: 2017-04-19
Online published: 2017-04-19
Supported by
National Natural Science Foundation of China (11472216)
研究了湿热环境中正交各向异性复合材料层合板结构受简谐激励作用的振动和声辐射特性。考虑了湿热应力和质量效应,利用一阶剪切变形理论和模态叠加法推导出四边简支层合壁板的固有频率计算公式,并采用Rayleigh积分得到其在简谐激励下的声辐射特性公式。基于湿热膨胀的等效性获得不同湿热环境下复合材料层合板的等效热膨胀系数,并进行有限元数值模拟,对理论公式进行了验证。算例结果表明,湿热环境导致复合材料层合板产生湿热应力,使得固有频率减小;单层板的振动特性对湿度和温度的变化更敏感;随着湿度和温度的增加,简谐激励作用下的复合材料层合板的振动速度响应、辐射声压级(SPL)、辐射声功率和声辐射效率曲线的波峰逐渐向低频方向移动,同时声辐射效率随之降低;低阶固有频率受湿度和温度的影响更加明显,声辐射特性曲线中低阶模态的波峰移动更显著。
赵天 , 杨智春 , 田玮 , 陈兆林 . 湿热环境下复合材料层合板振动与声辐射特性分析[J]. 航空学报, 2017 , 38(10) : 221038 -221038 . DOI: 10.7527/S1000-6893.2017.221038
The vibration and acoustic radiation characteristics of an orthotropic composite laminated plate excited by a harmonic concentrated force in hygrothermal environments are studied.Taking the effects of hygrothermal stress and additional mass effect into account,we derive the natural frequency formulations of four-edge simply-supported laminated panel based on the first-order shear deformation theory and mode superposition approach.The sound radiation formulations for the panel are obtained by using Rayleigh integral.Furthermore,the equivalent coefficients of thermal expansion of the panel in the hygrothermal environment are obtained according to the equivalence of hygrothermal expansion and thermal expansion.Numerical simulations are carried out with the finite element method to verify the analytical solutions.It is observed that the natural frequencies decrease with the increase of moisture content and temperature due to the effect of hygrothermal stress.The orthotropic lamina is more sensitive to hygrothermal effect than the laminated plate.Meanwhile,the peaks of dynamic response,Sound Pressure Level (SPL),sound power and acoustic radiation efficiency curves of the panel generally shift towards lower frequencies;and the acoustic radiation efficiency decreases with the elevation of temperature and moisture content,and this phenomenon is more evident in the low frequency region.
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