Simulation method for contact dynamic characteristics of high-speed and heavy-duty ball bearings in liquid rocket engines

Abstract

The invention discloses a contact dynamic characteristic simulation method of a high-speed heavy-duty ball bearing of a liquid rocket engine. The main implementation steps are: 1. Solve the contact normal stress of the ball bearing; 2. Based on the contact normal stress, establish a liquid rocket Engine low-speed heavy-duty ball bearing model; 3. Under the same working conditions as step 2, based on the pseudo-static analysis theory, establish a liquid rocket engine high-speed heavy-duty ball bearing model; 4. Static contact mechanical characteristics of low-speed heavy-duty ball bearings The calculated value is used as the initial value, which is substituted into the high-speed and heavy-duty ball bearing model, and the dynamic characteristics of each ball are calculated through the iteration of the co-evolutionary particle swarm algorithm of the double population; through this method, the ball bearing of the liquid rocket engine can be obtained from static to dynamic , Contact dynamic characteristic parameters and changing laws from single load to combined load and from low speed to extremely high speed.

Description

technical field [0001] The invention belongs to the field of dynamic characteristics of liquid rocket engine ball bearings, and mainly relates to a method for simulating the contact dynamic characteristics of liquid rocket engine high-speed and heavy-duty ball bearings. Background technique [0002] Bearings are important supporting and rotating parts that transmit motion and bear loads, and are widely used in major equipment technical fields such as aerospace propulsion systems, ship engineering, and precision instruments. Ball bearings are mainly used in the liquid rocket engine turbopump rotor system because they have the characteristics of high manufacturing precision, high limit speed, strong bearing capacity, and can bear radial load and axial load at the same time. [0003] Ball bearings are composed of structural elements such as balls, inner rings, outer rings, and cages. Their dynamic characteristics include dynamic contact angles between balls and inner and outer ...

AI Technical Summary

Problems solved by technology

In high-speed and heavy-duty ball bearings, bearing failures caused by ball slippage, fatigue, wear, etc. often occur, which directly lead to a decrease in the precision of the rotor system and a sharp increase in vibration. In severe cases, the metal on the surface of the ball bearing will fall off and enter the liquid rocket engine pump. cavity, while the engine turbo pump is in a high-pressure (greater than 10MPa) and low-temperature liquid oxygen environment, which can easily cause the engine to catch fire and explode

However, due to the large number of nonlinear equations in the dynamic model of the ball bearing, and it is sensitive to the initial value of the iteration, the solution is not easy to converge

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