Method for measuring radial dynamic flexibility of rolling bearing

Abstract

The invention provides a method for measuring the radial dynamic flexibility of a rolling bearing. A vibration table applies a dynamic load to an inner ring of the bearing directly through a switching section, a force sensor and an acceleration sensor are connected between the vibration table and the switching section, the vibration table applies simple harmonic excitation, data collected by the acceleration sensor and data collected by the force sensor are recorded, and a real load applied to the inner ring of the bearing is acquired by using a switching section influence eliminating technology; and a real displacement is acquired by using a multi-section displacement correcting technology, then a force-displacement hysteresis loop is drawn according to the synchronous real load and real displacement acquired by direct loading, and finally, the radial dynamic flexibility of the rolling bearing under parameters of different excitation frequencies, different force amplitudes and the like is acquired. The method provided by the invention is easy to implement and simple to operate, and can acquire a high-precision dynamic flexibility test value under the parameters of different excitation frequencies, different excitation force amplitudes and the like very conveniently.

Description

[0001] technical field [0002] The invention relates to a test method for the radial dynamic compliance of a bearing in the field of mechanical engineering. Specifically, it relates to using a direct loading method to complete the test for the radial dynamic compliance of a rolling bearing. Background technique [0003] Rolling bearings are widely used in the field of mechanical engineering. It is one of the most commonly used parts in rotating machinery. The dynamic compliance of its radial support is an important parameter for the dynamic characteristics of the rotor / rotating shaft. However, there is still a lack of mature testing methods for radial dynamic compliance of rolling bearings in engineering applications. In practice, general methods for testing the dynamic compliance of engineering components are still used. These methods are not fully suitable for high-precision testing of radial dynamic compliance of rolling bearings. , the error of the test result is lar...

AI Technical Summary

Problems solved by technology

The excitation force form of the simple harmonic excitation of the exciter is close to the loading situation of the rolling bearing under the actual working condition, but there are unfavorable constraints on the bearing when the exciter is loaded, and the constant amplitude excitation is usually not guaranteed; the transient excitation method of the hammer is simple , easy to operate, but its transient excitation form is quite different from the simple harmonic excitation under the actual working condition of the bearing, so the accuracy of the obtained results is poor; the mass eccentric rotor excitation simulates the loaded state of the rolling bearing under the actual working condition, and its The excitation form is very close to the actual situation of the bearing, but the complexity of the test equipment is required to be similar to that of the original equipment's rotor system, which is difficult to achieve in the dynamic compliance test of large and complex rotating machinery bearings

At the same time, the frequency range of the test is limited and affected by the critical speed of the rotor, and many characteristics (misalignment) of the simulated eccentric rotor system in the test equipment will bring errors to the test results

In the test, the radial dynamic load and the corresponding displacement of the rolling bearing cannot be directly measured, and it needs to be calculated by an approximate formula. All these cumulative errors will greatly reduce the accuracy of the test results

On the other hand, in terms of the displacement acquisition method of the radial dynamic compliance test of the bearing, the method of calculating the displacement by quadratic integration of acceleration commonly used in engineering will further enlarge the error of the test results

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