动态信号激励梁的数据处理方法探讨

针对动态信号激励梁的应用研究,提出了图形法和4种实验数据处理方法。重点介绍了4种实验数据处理方法,给出了每种方法的数据处理方式,进行了公式推导,并定义了影响指标,运用Matlab软件编制了计算程序。将其应用于动态信号激励梁的实验数据处理,分析对比了4种方法处理实验数据后的结果,总结出最优实验数据处理方法是导纳协方差法,概括了相关的结论,并对其应用进行了展望。

智能电能表动态特性测试相关问题分析

首先给出了动态测量的概念,概括了动态特性测试涉及的科学问题;据此,提出了动态电能测量和稳态电能测量的概念,给出了动态负荷、动态负荷特性、冲击负荷、动态电流的定义。进而,提出了动态测试激励信号建模的要求、电能表动态特性测试的相关要求、以及电能表的系统动态建模要求。其次,论述了电能表动态测试信号与系统建模的研究现况。然后,通过对比控制系统、测量系统、传感器的动态建模研究现状,指出了电能表的系统建模和测试信号建模的不足与存在问题,以及电能表的系统建模与测试信号建模的复杂性和差异性。最后,在分析控制系统与传感器的动态特性指标的基础上,提出了电能表的动态特性指标。论述的内容旨在为智能电能表动态特性的研究方面提供系统的研究思路,明确了电能表动态测试信号的建模要求和电能表系统建模要求。

位移传感器动态精度实验系统的研制

根据传感器动态精度理论研究的要求 ,研制了能反映不同速率动态信号激励下系统动态响应的位移传感器动态精度实验系统。该系统可实现动态输入信号速率的无级调速 ,由计算机采集输出信号并进行数据处理。

Mechanism of electro-hydraulic exciter for new tamping device

A new tamping device which is driven by an electrohydraulic exciter was proposed to overcome the limitations of mechanically driven devices.The double-rod oscillation cylinder drives the tamping arm to realize vibration.A new spin valve was designed in order to fulfill dynamic state requirements of the oscillation cylinder.Parametric analysis was carried out by establishing mathematic model.Then,the relationships among the structure of valve port and the frequency,amplitude,output shock force of the cylinder were researched.An experimental device of the electrohydraulic exciter was established to validate the theoretical results.The signals were acquired by AVANT dynamic signal analyser of vibration.The results show that new tamping device can satisfy all kinds of complex working conditions with the flexible adjustment of frequency and amplitude.