期刊论文

Study on wide band acoustical modal analysis and simulation of enclosure

中文

哈尔滨工业大学学报

Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology

0367-6234

1999

31

5

30-33

中国博士后科学基金!中博基［1998］9号；

本校为其他机构

全跨和半跨荷载组合作用下钢拱结构内力分布会随荷载比例发生较大变化。现有钢拱结构平面内稳定承载力计算式多是针对各单一加载模式进行分析得到的,缺乏对其在全跨和半跨组合荷载下适用性的充分考虑。针对此不足,以两铰抛物线钢拱结构为研究对象,考虑荷载组合比例、矢跨比、截面等不同参数的影响,对比分析了现行钢拱结构技术规程方法、基于完善拱模型的有限元方法和基于一致缺陷拱模型的有限元方法等多种方法的承载力计算结果。分析结果表明:当全跨荷载占较高比重时,按规程方法进行钢拱结构承载力设计会较为保守;而当半跨荷载占较高比重时,按规程方法进行钢拱结构承载力设计则会偏于不安全。

The acoustical modal calculation for a rectangular enclosure is analyzed and a new approach to calculate the sound modes in the enclosure with wide band sound signal excitation is proposed. The software of modal simtilation system includes acoustic modal frequencies and acoustic modal shapes is worked out for the first time by the use of C + + computer language. The experimental modal shapes in the enclosure are also measured with the use of TMS320 C25 DSP processor and the comparison between the simulation results and experiments pr...