悬臂梁冲击动载荷识别的试验研究
时间:2018-03-28 11:54 来源:毕业论文 作者:毕业论文 点击:次
| 摘要本文研究的问题是动载荷识别问题，属于振动问题的范畴，是振动问题中的第二类逆问题。 在工程实际中，有效的识别载荷可以保证工程和结构的可靠与安全，动载识别应用广泛，人们对其研究也愈来愈重视，研究者们也取得了不错的成果。本文总结动载荷识别问题的各种常用方法，如正则化方法、小波法、时域法、频域法等，并讲述其基本原理和主要工程应用。本毕业论文的载荷识别理论是广义正交、切比雪夫正交多项式，本文主要是介绍其理论推导的关键过程，并用软件进行识别仿真和实验。识别的主要思路是用正交多项式去拟合动载函数，构建响应和级数系数的关系，由有限测量点的信息和系统固有特性得到多项式的系数，由此实现动载荷识别。本文先进行理论推导，然后进行仿真分析和悬臂梁实验。从仿真和实验数据证实：本方法能完成对悬臂梁冲击载荷的识别，但仍存有不足。20287 关键词 载荷识别 切比雪夫广义正交 函数拟合 实验仿真 毕业论文设计说明书（论文）外文摘要 Title Experimental study on dynamic load identification cantilever Abstract Question of this study is to identify the dynamic load problem , the problem belongs to the category of vibration , the vibration problem is the inverse problem of the second kind .In engineering practice, the effective recognition load can guarantee reliability and safety engineering and structural dynamic load widespread recognition applications , more and more people pay attention to their studies , the researchers have achieved good results . This article summarizes the various load identification problems common method move, such as the regularization method , wavelet method , time domain , frequency domain method and describes its basic principles and main engineering applications. In this paper, load identification theory is generalized orthogonal Chebyshev orthogonal polynomials , this paper is to introduce the theoretical derivation of its key processes and identify software simulation and experiment. Identifying the main idea is to use orthogonal polynomials to fit the dynamic load function , build relationships response and progression coefficient by the inherent characteristics of limited information and systems of measurement points to get the polynomial coefficients , thereby achieving dynamic load identification .This article first theoretical derivation and simulation analysis and cantilever experiments. Simulation and experimental data confirmed: this method can complete the identification of the Izod impact loads , but there is still insufficient. Keywords Load identification Generalized Chebyshev quadrature formula Function fitting The simulation 目 次 1 引言1 2 绪论2 2.1 课题研究背景与意义 2 2.2 基本概念介绍2 2.3 目前研究方法3 2.4 载荷识别方法发展展望5 2.5 本文的主要工作…6 3 广义正交域法…7 3.1 广义正交多项式…7 3.2切比雪夫正交多项式…8 3.3 时间有限元法9 4 基于修正广义正交域的动载荷识别10 4.1 两类多项式介绍…10 4.2 载荷识别法的优化11 4.3 总结 12 (责任编辑：qin) |