Radial bearing static and dynamic excitation device consisting of spring and piezoelectric actuator

Abstract

The invention discloses a radial bearing static and dynamic excitation device consisting of a spring and a piezoelectric actuator. The radial bearing static and dynamic excitation device consists of a static load applying device, a dynamic load excitation device, a bearing lower tile body, a cylindrical supporting block and a forcing tile, wherein the static load applying device can apply a static load to a test bearing, can adjust a static load screw to compress a static load disc spring, and can transfer static load force to the forcing tile through the cylindrical supporting block; the dynamic load excitation device can apply dynamic excitation such as sine-wave excitation, step excitation, pulse excitation, random excitation and pseudorandom excitation to the test bearing; a dynamic load screw can adjust an initial position of the piezoelectric actuator; under the action of a control signal, the piezoelectric actuator is correspondingly deformed to compress a dynamic load disc spring; and dynamic excitation force is transferred to the forcing tile through the cylindrical supporting block. The radial bearing static and dynamic excitation device consisting of the spring and the piezoelectric actuator can simultaneously apply the static load and the dynamic excitation to the test bearing and can serve as a test bearing loading and excitation device for a novel bearing testing platform, and the defect that the static load and the dynamic excitation are required to be applied to a bearing by using different devices on the conventional bearing testing platform is overcome.

Description

Technical field: [0001] The invention belongs to the technical field of sliding bearings, in particular to a static load and dynamic excitation applied to a bearing by a bearing test bench, and a so-called radial bearing static and dynamic vibration excitation device composed of a spring and a piezoelectric actuator. Background technique: [0002] The dynamic coefficient of stiffness and damping of sliding bearings is an important parameter to characterize the service performance of bearings. In the traditional bearing test, bellows are usually used to apply static load to the bearing to simulate the actual loading condition of the bearing when it is in service; a vibrator is used to apply dynamic excitation to the bearing to simulate the disturbance of the bearing under service operating conditions . In the traditional bearing test, different devices are used to apply static load and dynamic excitation to the test bearing. Many instruments and test conditions used in the t...

AI Technical Summary

Problems solved by technology

In the traditional bearing test, different devices are used to apply static load and dynamic excitation to the test bearing. Many instruments and test conditions used in the test have occasional instability, and the installation of each device on the test bench will inevitably have errors; Due to the linear requirement of the oil film, the displacement perturbation excited by the vibrator is generally only about 10 μm, so the signal-to-noise ratio is unavoidably low for such a small signal, which makes it difficult to guarantee the test accuracy (Yuan Xiaoyang, master's degree thesis of Xi'an Jiaotong University, 1985 )

Images