Applied Mechanics and Materials Vol. 575

Abstract: This article is based on DC digital voltmeter test procedures requirements (JJG315-83).It aims to use this method to test digital voltmeter error on the basis of AC and DC voltage , current and resistance with automatic test equipment . Systematic error analysis for the relevant verification and standard deviation analysis is done to prove that test error 6 digital voltmeter is feasible with this device .

Abstract: In the teaching of optical courses, the aberration knowledge is abstract and students often feel it difficult to understand. According to this phenomenon, a new simulation algorithm, which is based on the analysis of chromatic and spherical aberration theory, is described in this paper; with Matlab as the programming language, the emulation programs of chromatic and spherical aberration are designed and the simulation figures are presented, from which the effect of parametric variation on aberration can be shown vividly and intuitively. And for students, this will be helpful in the mastery of aberration knowledge.

Abstract: The deformation analysis of explosion vessel is very important in strength analysis and engineering design. By means of laser Doppler measurement and Wigner-Ville distribution, the expansion process of steel explosion vessels has been studied, and the frequency characteristics of the strain wave are analyzed. Finally, the experimental results of deformation and vibration frequency of vessel are given under the condition of 300g TNT explosion equivalent.

Abstract: Incoherent gamma ray scattering is a method that can be applied for the fluid parameter characterization. The aim of the present work is to study the potential usage of the incoherent gamma ray scattering measurements to evaluate the fluid density based on the Monte Carlo approach. Enlarging the density of a fluid results in a significant reduction in the intensity of the detected gamma scattering. The difference of the simulation curve slope results in the gamma transmission mode its about 0.02 compared to the experimental result.

Abstract: With the extensive application of electronic, computer and electromechanical integration technology in the automobile industry, the concept and mode of detecting and repairing to auto have a fundamental shift. So the corresponding professional teaching methods should be improved. In view of the present situation that automobile teaching equipment is not suitable for the new situation, we study and design the checking and testing car for whole circuit. The car based on a typical vehicle has a further development. And it has a new design, compact structure and convenient operating way, which also has the functions such as dynamic demonstrating all electrical appliances, circuit connection, fault setting, dynamic detection and ECU code query, reading out the fault code and data flow, waveform analysis and actuator testing by using computer diagnosis instrument. So it can help greatly to improve students’ technical skills and work ability.

Abstract: By analyzing the component population and the requirements in the standards, we proposed sampling plan for project site. We can gain the lot acceptance by the minimum sample size.

Abstract: In this paper, the structure management technology of document is achieved by the secondary development of the PDM system. The paper-documents is canceled, the change files of design and process documents are implemented and circulated by electronics process in PDM system. The statistics and bulletin board function is added, the implementation and circulation process of design change files and process documents can be real-time monitoring.

Abstract: The main pollutants in Huaihe river city average concentration time series, for example, according to the basic principles of the wavelet analysis, the application of wavelet decomposition and reconstruction of Huaihe river main pollutant concentration changes of time sequence is analyzed by the major pollutants of Huaihe river in changing trends and mutation characteristics. The results of the study show that, wavelet analysis is applied to the analysis of the concentration of pollutant time series is feasible.

Abstract: Electron transport data been calculated numerically in mixture of molecular nitrogen and oxygen, using Monte Carlo simulation technique and a multi-term theory for solving the Boltzmann equation to investigate and obtaining the exact transport coefficients. It may serve the basis for modeling physical and chemical processes in streamer plasma discharges. Transport data influenced by the amount of O₂ in the mixture. The values of mean energy drift velocity reported.

Abstract: Gas supply method plays an important role in engine performance for natural gas engines (NGE). In order to overcome the low charging efficiency of pre-mixed fuel gas supply method the multi-point injection (MPI) gas engine controller hardware system is designed in this paper. For the nature gas engine controller the main controller is selected as the microcontroller MC9S12XSl28, then the circuitry for semiconductor piezoelectric air pressure sensor, potentiometer throttle position, thermistor temperature sensor, a magnetic-electric sensor for detecting the top dead center (TDC) and simulating engine speed are designed. What have done above is the base of software design. Key Words: nature gas engine; controller; hardware design