航空学报 > 2008, Vol. 30 Issue (6): 1640-1646

新型Σ-Δ多通道动态测试分析系统研究与实现

赵建洋1,2,张令弥1   

  1. 1 南京航空航天大学 振动工程研究所 2 淮阴工学院 计算机系
  • 收稿日期:2007-10-24 修回日期:2008-01-25 出版日期:2008-11-25 发布日期:2008-11-25
  • 通讯作者: 赵建洋

Research and Development of Multi-channel Dynamical Test and Analysis System-Based on Sigma-Delta Model

Zhao Jianyang1,2,Zhang Lingmi1

  

  1. 1 Institute of Vibration Engineering Research, Nanjing University of Aeronautics and Astronautics  2 Department of Computer, Huaiyin Institute of Technology
  • Received:2007-10-24 Revised:2008-01-25 Online:2008-11-25 Published:2008-11-25
  • Contact: Zhao Jianyang

摘要: 动态测试与分析系统需要动态范围(DRN)大、信噪比(SNR)高,传统方法实现复杂且成本高。本文分析了Σ-Δ调制的动态特性,提出基于Σ-Δ ADC(模-数转换器)ADS1271,Σ-Δ DAC(数-模转换器)AIC23及浮点数字信号处理器(DSP)芯片TMS320C6713的新型高精度动态测试与分析系统,实现了多通道实时动态测试与分析,系统具有24位采集精度,8通道可级联基本模块,实时频率细化FFT(Zoom-FFT)、功率谱密度(PSD)等分析功能, 正弦、瞬态扫频、随机和冲击响应谱等信号源功能以及高速USB2.0数据传输功能。系统用于振动、冲击、噪声工程等测试与分析系统,可取代国外最新产品。

关键词: 测试仪器, 动态测试与分析, Sigma-Delta调制, 数字信号处理, 波形合成

Abstract: This article presents an introduction to a new dynamical testing and analytical system. It begins with a discussion of oversampling techniques and the theory and advantages of Σ-Δ devices for digital-to-analogue conversion(DAC), which is very suitable for dynamical testing systems. Based on Σ-Δ ADC (analogue-to-digital- converter) ADS1271, Σ-Δ DAC AIC23 and digital signal processor (DSP) TMS320C6713, the article then proposes a system with high performance of 24 bits in each of the 8 channels and many functions of digital signal processing, signal sources producing and data transmitting. The digital signal processing involves fast Fourier transform (FFT), ZoomFFT, power spectral density (PSD) and other functions. The signal sources can produce sine wave, swept wave, random wave and shock response spectrum. All the data can be transmitted to/from PC application.The system is designed for data display, secondary signal processing, signal source controlling and the interface between the users and PC, via USB2.0 devices. It can be used in vibration, shock and noise testing and control projects to replace imported hitech products.

Key words: test instrument, dynamical test and analysis, Sigma-Delta modulation, digital signal processing, synthesis waveform

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