The test method of CAN bus is studied systematically, and the test problem of CAN bus in vehicle electronic system is solved. Aiming at the problem that there is no comprehensive test method for bus performance at present, the advantages and disadvantages of the existing three methods are compared and analyzed, and a direct connection simulation test method is proposed to comprehensively test CAN bus network performance and single ECU performance. The analysis results show that this method CAN not only test the network performance of CAN bus, but also test and analyze the performance of a single ECU node, which solves the test problem of CAN bus in vehicle electronic system.
Aiming at the shortcomings of poor platform universality, long preparation time and high safety fire risk in the experiment of individual rocket weapon, a kind of general launching platform based on magnetic induction sensor is designed. The height adjustment mechanism of launching platform adopts worm gear and worm drive mechanism. The direction adjusting mechanism adopts tooth arc and gear connection mode. The rotating part adopts the worm gear and worm speed reduction mechanism. By using the method mentioned above, the problem of freely adjusting the launching platform in three degrees of freedom is solved. The universal launching target of individual rocket weapons is realized. The electromagnetic firing is realized by using magnetic induction sensor and electromagnet, and the firing safety is improved. The design of the launch platform has been verified in the actual experiment.
COFDM technology has been applied in wireless transmission system of moving remote control target. The basic principle, advantages and disadvantages of coded orthogonal frequency division multiplexing (COFDM) are analyzed. A wireless transmission system of moving remote control target based on COFDM self-organizing network is designed to meet the requirements of low delay and high image definition. The coverage capability and transmission performance of the system are analyzed. The results show that the self-organizing network technology based on COFDM can completely meet the wireless transmission requirements of the existing moving remote control targets. The method has been validated in the sports car experiment, which lays a foundation for the following remote control target cluster communication application.
Two different methods are used to calculate the air resistance of high-speed monorail pulley. The calculation of rocket sled Air Drag Coefficient is the key technology to realize rocket sled trajectory accurate control. The commonly used methods for calculating the Aerodynamic Drag Coefficient of rocket sled are the wind tunnel test method and the sled integral decomposition method. In Wind Tunnel Test, the wind tunnel wall influence, the test result error is big. The whole decomposition method is simple and the settlement result is more accurate. Firstly, the relationship between the pulley speed and the air drag coefficient is obtained by discretizing the measured air drag coefficient curve. Then, the wind resistance coefficient of the high-speed monorail pulley is calculated by the whole decomposition method. At last, the air resistance of pulley under different wind speed is calculated by finite element method. Compared with the finite element method, the error of the whole decomposition method is less than 10% . When the air resistance coefficient of the pulley increases by 0.02, the maximum speed of the pulley decreases by 30m/s, which provides a basis for the design of the high-speed monorail pulley. This method provides technical support for the design of high-speed monorail train, and calculates the wind resistance coefficient of the pulley by using the integral decomposition method and the finite element simulation method
Finite element software is used to check the strength of the rocket sled during recovery. In this paper, the finite element method is used to model the double track sled and the water brake. The water brake is loaded and the constraints, contacts and connections are defined. The water resistance of the water brake is loaded when the double track sled is recovered by using the fluid mechanics simulation. At last, the static analysis is used to analyze the force on the key parts of the double-track sled, and the strength of the whole sled is checked. At the moment of entering the water, the stress concentration occurs at the connection part of the sled exit with the body beam and the connection part of the support seat with the body beam, so the connection strength should be strengthened. This method provides technical support for body design, water brake design and sled recovery application.
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