摘要
复合材料梁具有强度高、质量轻、耐腐蚀、耐高温以及抗疲劳等诸多优良性能,在工程中有广泛的应用,如风力机叶片、直升机螺旋桨等.基于湿热环境下旋转复合材料薄壁梁振动方程,研究了梁的扭转运动.采用Rayleigh-Ritz法求解振动特性,分析了温度、湿度、转速、安装角、铺层角等因素对固有频率和模态振型的影响.采用有限元方法验证了计算结果的精确性.研究表明:前2阶频率随着温度和湿度的升高而降低;与湿度相比,温度对频率的影响更为显著;T=325~425 K且铺层角为15°~30°时,温度对频率的影响略小;铺层角在0°或90°附近时,湿度对频率的影响不大;频率随转速增大而增大,随安装角增大而降低;铺层角对频率有较大影响;温度、湿度、转速、铺层角和安装角对前2阶模态振型影响很小.
Composite beams have a number of excellent properties such as high strength,light weight,strong corrosion resistance,strong temperature resistance and strong fatigue resistance,and are widely used in engineering such as wind turbine blades,helicopter propellers,etc.Based on the vibration equations of a rotating composite thin-walled beam in the hygrothermal environment,the torsional motion of the beam was studied.The solutions of the eigenvalue equations were derived using the Rayleigh-Ritz method.The influences of temperature,moisture,rotating speed,mounting angle,ply angle and other factors on the frequencies and mode shapes were analyzed.The accuracy of the calculation results was verified using the finite element method.The results show that the first two frequencies decrease with the increase of temperature and humidity.And compared to humidity,temperature has a more significant impact on frequencies.For the conditions of T=325~425 K and the ply angle of 15°~30°,the influence of temperature on the frequency is slightly smaller.For the ply angle around o°or 90°,the humidity has little effect on the frequencies.In addition,the frequencies increase as the rotational speed increases or the mounting angle decreases.The ply angle has a significant influence on the frequencies.It is also found that temperature,moisture,rotational speed,ply angle and mounting angle have little effect on the modal shape of the first two modes.
作者
袁玲
李亮
王龙
李映辉
YUAN Ling;LI Liang;WANG Long;LI Yinghui(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China;School of Mechanics and Optoelectronic Physics,Anhui University of Science and Technology,Huainan 232001,Anhui,China;School of Mechanical Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)
出处
《力学季刊》
CAS
CSCD
北大核心
2024年第1期144-154,共11页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(11902002,51705002)
四川省自然科学基金(2022NSFSC0275)。
关键词
动态特性
薄壁梁
复合材料
温度
湿度
铺层
dynamic characteristics
composite
thin-walled beam
temperature
moisture
ply angle
