Launch Vehicle Digital Intelligent Data Assessment System

Aerospace science and technology becomes a integrated mark of the strength of a nation's military, economics and science and technology, so it is a key field that all countries are striving to develop. As a important aerospace conveyance, launch vehicles is the comprehensive reflection to the aerospace science and technology application. Launch vehicles, represented by the Long March 3 and the Long March 5, has high launching success rate and high carrying capacity, meanwhile the new launch vehicles with strong driving force bear the very important tasks in the future, such as carrying the space station of large tonnage, Chang'e lunar landing, etc. The structure of the launch vehicles is complex, the system large, the constructing price very high. And it have the condition of real installing only before launching, thus seriously restricting the training of reserved technicians and the accumulation of the experience in testing and researching the launch vehicles. Even without the condition of real installing, the power-up test will reduce the service life of the electronic components, consequently affecting the launching success rate. To make sure that there is no miss in launch vehicles launching test, it developed and applied the digital test and simulation system for launch vehicles. The training level of testing, launching operation and the ability to response to emergency situations for technical staff can be effectively improved by Launch vehicle test and simulation system, which is developed to do numerical and visual simulation for the subsystem and equipments, to simulate the rocket 's launching test under the condition of real installing, and to establish the fault model. The digital intelligent data evaluation system for launch vehicles researched and developed in this paper is a part of the digital test and simulation system for launch vehicles. The system acquires test data of launch vehicles by the test data servers, through the ways of positions C3I network, telemetry data CDs, flight data CDs, record instrument files and so on, establishing a database based on the Long March series launch vehicles' testing. Combined with the test database, diagnosis knowledge library, test simulation model library, visual simulation model library, value simulation model library and test equipment model library, the database builds a launch vehicles' data center which works as the underlying support to the digital intelligent data evaluation system for launch vehicles. Eventually the system achieves the purposes of receiving, storage, display and intelligent interpretation of the launch vehicle test data, reducing human intervention errors and improving test accuracy.This paper has done a lot work in three main ways: first, it presents the general idea and specific design program of the digital intelligent data evaluation system based on full study in the test simulation system for launch vehicles and full understanding to the specific requirements of the system; two, it achieves the main functions of the system in windows 2003 server, Windows XP operating system, using Microsoft Visual Net 2005 as the software development tool, third, it carrys out function experiments for the system and analyse its performance.This paper mainly uses two key technologies: one is the data representation format based on XML, which can make a full use of the advantage of the standard to get more tool support in technology; two is the multi-thread communication based on the intermediaries and the chain of responsibility mode, which solves the problem of the pool real-time.The innovations in this paper mainly include two aspects: for the first time it leads the quantitative criteria into evaluating the consistency in the interpretation to the launch vehicles' data, it makes a unified processing to global information in receiving and transmitting, thus avoiding the duplication of workload for each evaluation terminal; for the first time it uses the correlation coefficient to describe the trends and the synchronous changes of the launch vehicles' parameters, which characterize the strength of the correlation of the two parameters more accurately than using previous describing methods, they can intuitively reflect the trends and synchronous changes of parameters for easier judgements and decisions.Through the test and performance analysis to the software, it achieves a real-time and multi-user distributed system, which has perits of good human-computer interaction interface, high efficiency, great maintainability, the ability of preventing wrong operations and so on. About the efficiency, the CPU consumption occupied by the software is less than 35 percent of the configured computer, and the memory consumption 75 percent. About the maintainability, the software is easy to test, easy to modify and maintain, easy to add and delete several functions. About the fault tolerance, the software can alarm if there is any wrong data and operation, avoiding the users' wrong operations. This system reaches the expected goal, and achieves the corresponding functions.