Intershaft bearing vibration experiment device

Abstract

The invention provides an intershaft bearing vibration experiment device. The intershaft bearing vibration experiment device comprises an experiment table base, a high-pressure rotor system, a low-pressure rotor system, a test system, a load simulation device and a temperature environment simulation device, wherein the high-pressure rotor system and the lower-pressure rotor system are used for allowing an inner sleeve ring and an outer sleeve ring of an intershaft bearing to rotate at different speeds, the test system is used for testing, transmitting and acquiring a vibration signal of the intershaft bearing, the load simulation device is used for simulating a centrifugal load and a radial load which are borne by the intershaft bearing, and the temperature environment simulation device is used for simulating a high-temperature environment of the intershaft bearing. In the intershaft bearing vibration experiment device provided by the invention, the simulation of the temperature environment and the load characteristic of the intershaft bearing is achieved, and meanwhile, the interference of other parts on the vibration signal of the intershaft bearing is prevented; and the proposed intershaft bearing test method is used for directly testing surface vibration of an inner circle and an outer circle of a bearing body, and the vibration characteristic of the intershaft bearing body can be effectively analyzed.

Description

technical field [0001] The invention belongs to the field of rolling bearing tests, in particular to a vibration test device for intermediate bearings. Background technique [0002] Intermediary bearings are used to connect and support the low-pressure and high-pressure rotors of aero-engines. In high-temperature, high-speed, and complex-load environments, failures such as excessive vibration or overheating and burns often occur, and have become the weak link of aero-engines. When the intermediate bearing works, the inner and outer rings rotate at the same time, and its vibration characteristics are very different from the single inner ring or single outer ring rotation of the traditional bearing. In addition, the intermediate bearing is in a high-temperature environment, and the working temperature is as high as 150 ° C. Temperature changes will also cause The vibration characteristics of the bearing change. At the same time, the gravity of the rotor system and the radial f...

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Problems solved by technology

For example, patents: a vibration test device for internal and external rotor systems (CN 201724799 U), a dual-rotor fault simulation test device (CN103759934 B), aero-engine intermediate bearing fault detection method and detection device (CN 105651515 B) The above patents are all in the test A vibration sensor is installed on the bearing seat on the platform to measure the vibration signal of the intermediate bearing. There is a large error in the test signal. At the same time, the vibration of other devices on the test bench such as couplings and supporting rolling bearings will interfere with the vibration of the intermediate bearing and affect the accuracy of vibration signal collection. sex

For example, the design of the aero-engine simulation test bench based on the simplified dynamic model of the patent (CN20151081686), and the loading method of the aero-engine intermediary bearing double-rotor test bench (CN 105841960 B) are supported by rolling bearings, and the motor and the rotor are connected by couplings. Measures for vibration isolation are not considered

Moreover, none of the above intermediary bearing test benches can realize the simulation of intermediary bearings in high temperature environments.

[0004] In addition, the following problems generally exist in the current intermediate bearing tester: (1) It is difficult to simulate complex load and high temperature working environment

(2) Vibration isolation measures are not adopted, such as rolling bearings for supporting bearings or couplings between the motor and the rotor, the vibration inside the motor is transmitted to the rotor system, and there are a large number of interference signals in the vibration acquisition data

(3) It is unavoidable to effectively apply radial load to the bearing under the condition of introducing interference signals. Since the inner and outer rings of the intermediary rotate at the same time, it is necessary to add additional transitional rolling bearings to apply radial loads, but it will also increase the interference signals generated by rolling bearings.

(4) The vibration test of the intermediate bearing is mostly characterized by testing the bearing seat, and the intermediate bearing body is not directly tested. In the actual process, there is a complicated transmission path for the vibration of the intermediate bearing to be transmitted to the bearing seat, which leads to changes in the vibration signal and cannot effectively analyze the intermediate bearing. The vibration characteristics of

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