基于混沌的汽车飞轮壳裂纹微弱信号检测
基于混沌的汽车飞轮壳裂纹微弱信号检测(论文14000字)
摘要:传统的微弱信号检测只能在信噪比较高的情况下实现,当微弱信号检测是利用混沌理论时,可以降低一些误差,并且能提升检测性能。在实际生活中,Duffing振子对于检测微弱信号的优化是十分重要的。论文介绍了利用Duffing振子的特性进行检测的方法,并利给出了弱信号幅值检测方法的具体步骤,对夹杂着强噪声的微弱周期信号检测进行了电路和MATLAB仿真分析。汽车飞轮壳在运行过程中可能出现裂纹,针对这一问题,运用duffing振子检测裂纹产生的微弱信号。以及其它相关研究进行对比,确定飞轮壳出现的信号,判断该裂纹是否出现,此项检测可应用于汽车零部件的早期故障分析。
关键词:duffing振子;微弱信号检测;混沌;裂纹;
Weak signal detection of the cracks in car based on chaos
Abstract:The traditional weak signal detection can only be realized when the signal-to-noise ratio is high. When the weak signal detection is using the chaos theory, some errors can be reduced and the detection performance can be improved. In actual life, the Duffing oscillator is very important for the optimization of weak signals. In this paper, the method of detecting the characteristics of Duffing oscillator is introduced, and the concrete step of weak signal amplitude detection method is given. The circuit and MATLAB simulation of weak periodic signal detection with strong noise are analyzed. Car flywheel shell in the course of the operation may be cracks, for this problem, the use of duffing oscillator to detect the weak signal generated by the crack. And other related research to determine the flywheel shell appears to determine the signal appears, this test can be applied to the early analysis of automotive components.
Key word:duffing;weak signal detection;chaotic;crack
目录
摘要
1引言 3
2 混沌理论 3
2.1 混沌的基本理论及其特点 3
2.1.1 混沌的几种解释 3
2.1.2 混沌的基本特征 4
2.2 Duffing 振子的数学模型及其分析 5
3混沌状态判别方法 8
4 基于特定混沌轨迹变化的幅值检测方案 9
4.1 基于Holmes 型 Duffing 振子的微弱信号幅值检测 10
4.1.1 数学模型与仿真模型建立 10
4.1.2 利用达芬振子的检测原理 11
4.1.3 仿真实验及分析 13
4.1.4 duffing方程的改进 13
4.2 检测电路的设计与仿真 14
4.3利用达芬振子特性进行的频率的检测方法 18
5Duffing方程电路的实现 18
6结束语 20 [来源:http://Doc163.com]
6.1 全文工作总结 20
6.2当前问题 21
6.3 展望 21
参 考 文 献 22
致谢 23