为研究高速列车以300 km/h速度下穿某机场地下车站时的车站辐射噪声,基于统计能量法(Statistical Energy Analysis,SEA)建立该地下车站的SEA模型,进行地下车站辐射噪声预测研究。通过开展高速列车噪声实车测试,获得转向架、受电弓等主...为研究高速列车以300 km/h速度下穿某机场地下车站时的车站辐射噪声,基于统计能量法(Statistical Energy Analysis,SEA)建立该地下车站的SEA模型,进行地下车站辐射噪声预测研究。通过开展高速列车噪声实车测试,获得转向架、受电弓等主要噪声源区域的声功率级频谱。将实车噪声测试结果作为高速列车穿行时的噪声源激励,利用SEA统计能量分析法对地下车站噪声进行数值分析,详细研究单车越行、中部交会和端部交会3种工况下的车站噪声特性。根据数值分析结果可得,两车端部交会时产生的站台噪声最大,站台总声压级最高可达80.11 dB,超过80 dB的标准规定,需要在站台处有针对性地进行降噪设计。最后,通过不同位置的竖井设计方案,分析地下车站噪声的辐射传播规律。该研究可为高速列车穿越机场综合交通枢纽所引起的类似站台噪声问题提供参考。展开更多
An efficient computational framework for reliability analysis and reliability-based design optimization of piezoelectric composite beam with delamination is presented.In the proposed approach,the transverse shear defo...An efficient computational framework for reliability analysis and reliability-based design optimization of piezoelectric composite beam with delamination is presented.In the proposed approach,the transverse shear deformation,delamination and piezoelectricity of the beam are taken into account.By introducing the Heaviside step function into the displacement components and using the Rayleigh-Ritz method,and the buckling governing equations for the piezoelectric composite beams is obtained.The reliability of the beams is obtained by integrating the support vector machine method and first order reliability method,further the reliability-based optimization is executed through employing genetic algorithm.The effects of ply style,delamination length and voltage are discussed in details.Numerical results indicate that the comprehensive computational scheme provides a unified numerical framework to analysis the nondeterministic buckling and reliability efficiently.展开更多
基金National Natural Science Foundation of China(No.11662004)National Key Research and Development(R&D)Program of China(No.2017YFB1201103-04)Research Program for Employees of Jishou University,China(No.jsdxrcyjkyxm201602)
文摘An efficient computational framework for reliability analysis and reliability-based design optimization of piezoelectric composite beam with delamination is presented.In the proposed approach,the transverse shear deformation,delamination and piezoelectricity of the beam are taken into account.By introducing the Heaviside step function into the displacement components and using the Rayleigh-Ritz method,and the buckling governing equations for the piezoelectric composite beams is obtained.The reliability of the beams is obtained by integrating the support vector machine method and first order reliability method,further the reliability-based optimization is executed through employing genetic algorithm.The effects of ply style,delamination length and voltage are discussed in details.Numerical results indicate that the comprehensive computational scheme provides a unified numerical framework to analysis the nondeterministic buckling and reliability efficiently.
