Research On The Development And Quality Characteristics Of A Specific Atmosphere Sampling And Control System

The specific sampling measurement and control system(abbreviated as the measurement and control system)is a military atmospheric monitoring equipment based on an aviation platform.Due to the special use environment and application scenarios of military equipment,there are higher requirements for the quality characteristics of the equipment.This article focuses on the design and quality research of the measurement and control system.This paper completes the hardware design and supporting software development of the measurement and control system.In the research,the emphasis is on quantitative research on the reliability and electromagnetic compatibility characteristics of the measurement and control system,and qualitative evaluation of other quality characteristics of the system.The main research contents of the thesis are as follows:1.The hardware and software design of sampling measurement and control system.This paper completes the design of the electrical hardware circuit,embedded software(measurement and control software)and upper computer software of the measurement and control system,and develops a principle prototype to realize the relevant functions required by the system,and has been tested and verified.2.Reliability prediction based on Monte Carlo method.This paper firstly uses the stress analysis method to obtain the unit reliability data.Combined with the reliability block diagram of the measurement and control system,the Monte Carlo method is used for simulation calculation,and the system reliability index is obtained,including the reliability of 10,000 hours,the mean time between failures(MTBF),and the system failure rate.Based on the results,the weak links were analyzed and rectified.In this paper,various reliability indexes are calculated by sampling component life,which can quickly and concisely calculate the non-constant type failure rate,the lower limit of the reliability of the specified working time,etc.,which are difficult to calculate by other methods.3.Far field prediction of electromagnetic radiation in PCB board under phaseless near field scan information.On the basis of searching for equivalent dipole sources on PCB boards through global optimization algorithms and predicting long-range radiation,this paper proposes a particle swarm optimization algorithm for dipole sources based on preset positions.Based on the analysis of the distribution law of equivalent dipoles on the PCB,this method first presets the positions of the dipoles,and then iterates according to the near-field fitting error to dynamically add and delete dipoles.Simulation experiments have confirmed the correctness and effectiveness of the method.Using this method,the electric control box PCB board is predicted,providing an important reference for EMC design.4.Qualitative evaluation of the measurement and control system.For the maintainability,testability,safety and security of the measurement and control system,qualitative evaluation is carried out in accordance with the steps of formulating evaluation indicators,inviting experts to score,analyzing and calculating weights,and comprehensive evaluation results.The evaluation indicators have been cropped and rich in combination with the national military standard and becomes more targeted.The hierarchical analysis method is used to calculate the weight of the indicator weight,and it has certain objectivity by analyzing each expert’s weight and positive and negative matrix.This paper has completed the preliminary design of the measurement and control system,and analyzed and evaluated the key quality characteristics of the system.In the research process,the Monte Carlo-based reliability prediction method and the dipole source particle swarm optimization algorithm based on the preset position are used,which have certain reference significance for the design and evaluation of the measurement and control system.