Robust optimization design method of contact net support suspension system wrist-arm based on disturbance interference theory

Abstract

The invention discloses a robust optimization design method of a contact net support suspension system wrist-arm based on a disturbance interference theory. The robust optimization design method of the contact net support suspension system wrist-arm based on the disturbance interference theory comprises the following steps: establishing a stress expression for an X type wrist-arm; considering design parameters as random variables, and obtaining a reliability characteristic equation based on the probability interference theory; performing micro-disturbance on the random variables and the reliability characteristic equation; calculating a robust reliability indicator; converting a probability distribution function that randomly distributes the random parameters into a standard normal distribution function; calculating the robust reliability of the wrist-arm; and establishing a mathematical model for the robust optimization of the wrist-arm. In the robust optimization design method of thecontact net support suspension system wrist-arm based on the disturbance interference theory, the non-deterministic probability theory, micro-disturbance and Edgeworth theory are introduced into thestructural design of the wrist-arm, and the wrist-arm reliability is directly embedded into the optimization model; therefore, the key technology of the robust design of electrified railway contact net is solved.

Description

technical field [0001] The invention relates to the technical field of railway power supply, in particular to a robust optimization design method for a catenary support suspension system arm based on disturbance interference theory. Background technique [0002] As a means of transport with large volume, fast speed and low pollution, high-speed rail has developed rapidly in recent years. The operating mileage has reached 11,028 kilometers, and the scale of high-speed railways under construction is 12,000 kilometers. It has become the country with the longest mileage of high-speed railways in operation and the largest scale under construction in the world. [0003] Electrified railway is a railway dominated by two kinds of railway trains, electric locomotives or EMUs. The traction power of the electrified railway is an electric locomotive. The locomotive itself does not carry energy, and the required energy is provided by the electric traction power supply system. The caten...

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Problems solved by technology

However, under the pulling force of the contact suspension system, the wrist arm will cause complex changes in various parameters, and it is almost impossible to obtain an accurate solution using the analytical method. In addition, it is difficult to determine the distribution type of stress and strength and its probability density function. To determine Its joint probability density function is more difficult, so it is very difficult to carry out robust design; at present, the traditional deterministic method is basically used to design the structural size of the wrist arm by using the safety factor. This design method ignores the parameters of the wrist arm. Uncertainty factors, no optimization design from the perspective of reliability and robustness, with greater experience and blindness

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