MAF空气动力风动数据采集系统.pdf

沈阳理工大学硕士学位论文摘要空气动力研究是一个多方面因素交互作用的复杂过程,空气动力学的研究与许多参数有关。不同环境下的的气体参数,肯定会反映在与空气动力本身固有的参数上,如滞止压强,温度,气体流量等。针对气动过程稳定性和在线检测的问题,本文以超音速气流的压强,温度作为研究对象开发了一套基于虚拟仪器的采集检测系统。该系统由硬件信号检测电路和相关软件组成。系统以微机为主要核心设备,其它外围硬件包括压强、温度霍尔传感器、信号调理电路、 NI PCI-6023E 数据采集卡和与之配套的接口电路。虚拟仪器采用虚拟仪器图形化编程语言 开发。整个系统具有信号采集、波形实时显示、数据存储、数据回放、统计分析、试验参数记录等功能。本系统利用时域、频域、统计等多种方法对压强,温度波信号进行分析。时域上着重分析两种信号的同步性以及它们的自相关和互相关,频域上研究了信号的傅立叶谱和 FIR 数字滤波器。通过应用本系统对超音速气体的压强、温度波形的采集与分析处理,能够为分析与评判物体空气动力特性提供直观可靠的依据,为实现气体的在线检测与评判提供参考和指导。可广泛应用于教学实验以及在武器弹药工程,航空航天等方面的研究,为各类飞行器的研制提供了模拟手段,必将推进航空事业的发展。关键词:风洞; 虚拟仪器; 数据采集沈阳理工大学硕士学位论文 Abstract The aerodynamic research is plex process of interaction,the ae rodynamics research concerns with many parameters. Under different environmental parameters of the gas will certainly be reflected in the inherent and aerodynamic parameters, such as the stagnation pressure, temperature, gas flow. For aerodynamic stability and on-line detection of process problems, this paper supersonic airflow pressu re and temperature for the study has developed a collection of virtual instrument based on the detection system. The system consists of hardware-signal de tection circuit and re lated software. The system use puter as the main equi pment, other peripheral hardware, including pressure, temperature Hall sensors, signal conditioning circuits, NI PCI-6023E data acquisition card and plete se t of interface circuits. The use of virtual instrument Virtual Instruments graphical programming language developed . The entire system has signal acquisition, real- time waveform display and data storage, data playback, statistical analysis, records of test parameters and other functions. The system uses time-domain, frequency domain, statistical and other methods of pr essure, temperature, wave signal analysis. Focus on time domain analys is of the synchronization of two signals and their auto correlation and cross correlati on, study of frequency domain signal of the Fourier spect