Abstract:The paper reviews the development period of various type flowmeters in China and explains the gradual progress of flowmeter manufacturing industry.Three developing models(copy,research and development,introducing technolgy)are presented.The current research situation of multiphase fluid flowmeter is expounded and the developing domain of flowmeter is looked forward to the nearfuture.

Abstract:In order to study the absorbing work of undercarriage under the impact load in the landing gear drop test,it is necessary to measure the dynamic values of three direction displacement of aircraft wheel in the twinkling of the aircraft landing.Therefore,a space positional device with four degrees of freedom is designed and connected with the computer measurement system.By using this experiment device,the three direction displacement of aircraft wheel under the high speed impact load can be measured and recorded effectively.

Abstract:With the increasing of the cost and complexity of products,Failure Modes and Effects Analysis(FMEA) are becoming an indispensable part of the design process of complex systems.However,it isn't effective for complex system due to the qualititative reasoning maily by experiences,which is overloaded with details.It is difficult to ensure the fault effect of each fault modes.In this paper,based on the functional role model theory,the reasoning rule and the technique of FMEA,which are facing to Built in Test(BIT),are developed.The process of fault analysis is illustrated by the Fuel metering System of jet plane engine.The results of research show that the fuctional role model theory can be more efficient and effective in the FMEA.

Abstract:In this paper,the realization of two dimension FFT by using FPGA is studied and achieved.It eliminates the confliction between real time image manipulation of space solar telescope and lower operation speed of the space level DSP;It is approved by experiments that all the targets are satisfied.

Abstract:介绍了目前常使用的正多面棱体和多齿分度台 ,阐述了它们之间如何实现基准小角度的方法 ,最后介绍了一个用 2 3面棱体和 36 0齿盘差分出小角度 1°/ 2 3,测量感应同步器的测角系统每 1°内 2 3点的角位置误差的方法

Abstract:In this paper, we introduce the scheme of frequency synthesis in GT9000 microwave synthesizer, and discuse how to synthese high stable signal from 10 MHz to 26 5 GHz with spectral pure and 1 Hz resolution.

Abstract:This paper introduces the measurement method of passive intermodulation distortion, and mainly discusses the test principle of modern passive intermodulation distortion analyzer, the setup of measurement system and means of improving the measurement accuracy.

Abstract:This paper introduces the digital alteration for the measurement roundness instrument. The digital signal processing and single form method for the measurement have been discussed. At last the real result of roundness measurement has been given.

Abstract:Through the analysis of measure uncertainty of numerically controlled machine tools' positioning accuracy, the compound standard uncertainty and expansion uncertainty of this method are determined, then the evidence for the calibration of numerically controlled machine tools is supplied.

Abstract:The purpose of this paper is to illustrate the centrifugal calibration of the mathematical model of linear accelerometer, also including the discussion of data analysis using least square parameter estimation, and the calculation of the uncertainty of the said mathematical model's coefficients.

Abstract:The uncertainty on 2cm microwave attenuation measurement system of series R.F. substitution method is verified by the transfer comparing method. The repeatability of measurement standard system is expressed by the experimental standard deviation s n(A) within the measurement group and the stability of measurement standard system is expressed by the experiment standard deviation s m among the different measurement groups.

Abstract:This paper introduces a kind of integrate control display system simulator for the software test of strapdown inertial navigation system(SINS), which is designed by the virtual instrument technique. The simulator can provide the realtime system parameter, it can verify the bottom communication function and also can provide a reference benchmark for the whole system debugging. The simulator is now applied in the software detect for a kind of strapdown inertial navigation system of our country.