As a kind of rotating machinery which mainly relies on rotary motion to complete power and motion transmission, it is widely used in aero-engine, gas turbine and various kinds of motors. Especially for the application in aerospace and other high-speed, precision mechanical equipment, also has a pivotal position.
With the continuous development of modern industry and the continuous innovation of science and technology, the rotating machinery applied in all walks of life takes light, high speed, heavy load and automation as the development direction, which makes people put forward higher requirements for the safety, reliability, stability and work efficiency of equipment operation. In this increasingly stringent requirements, people pay more and more attention to the dynamic performance of rotating machinery working in various environments. As the main power transmission component of rotating machinery, if the rotor system has abnormal vibration, it will affect the safe operation of the unit, even lead to economic losses and major safety accidents. The performance of its dynamic characteristics is also one of the indicators to evaluate the safety of the whole set of mechanical equipment. Therefore, people urgently want to understand the dynamic performance of the whole system, which makes the research on the dynamic characteristics of rotating machinery become a hot research direction, and has formed an important branch of discipline – rotor dynamics, the object of study is the dynamic characteristics of the rotor and its related parts, the purpose of the research is to study the dynamic characteristics of the rotor and its related parts The rotor and its components of rotating machinery provide theoretical and technical support and guarantee in terms of work efficiency, optimal design, working life and safety.
As there are many kinds of rotating machinery, the main factors that affect the stability of the system and the working efficiency of the units are also different. However, according to the statistics of relevant data, the good dynamic characteristics of the rotor system is the basis for ensuring the working efficiency and long-term stable operation of the rotating machinery. Today, with the continuous development of dynamic theory, people in the dynamic analysis of rotating machinery, the factors affecting the stability of the system are gradually changed, and the traditional research on the dynamic characteristics of the rotor system is usually limited to the rotor, and then the bearing support is considered, but the transmission device and sealing components in the system are rarely considered Influence on rotor. However, in engineering practice, the factors that are not considered have great influence on the dynamic characteristics of rotor system. Therefore, the traditional analysis methods of rotor system dynamic characteristics can not meet the needs of engineering practice.
Therefore, the dynamic characteristics of the rotor in the seal tester under different working conditions are studied to understand the dynamic response of the rotor under different working conditions. On the contrary, the vibration characteristics of the rotor have an impact on the sealing performance of the seal in the tester to a certain extent. Therefore, a clear understanding of the vibration characteristics of the rotor can also provide effective theoretical support for the design of the subsequent sealing structure. Therefore, this paper establishes a multi degree of freedom nonlinear dynamic model of the sealed rotor system considering the gear meshing characteristics under specific assumptions, and uses this model to study the dynamic characteristics of the system, so as to achieve a more accurate understanding of the dynamic response of the sealed rotor system, improve the stability of the rotor in the seal tester, and provide theoretical reference for the further study of the dynamic characteristics of the rotor system To provide theoretical support for the design of the seal structure to improve the working efficiency of the rotor and the sealing performance of the seal.