Thin-wall cylinder modal test system and method for single-point laser continuous scanning vibration test

Abstract

The invention discloses a thin-wall cylinder modal test system and method for a single-point laser continuous scanning vibration test. The thin-wall cylinder modal test system for the single-point laser continuous scanning vibration test comprises a thin-wall cylinder, a laser vibrometer, a right-angle prism with a 45-degree angle, a vibration exciter and a data acquisition system, wherein the thin-wall cylinder is suspended on a bracket; the right-angle prism with the 45-degree angle is arranged on the thin-wall cylinder center line in the thin-wall cylinder and fixedly arranged at one end of a rotation motion control system; the rotation motion control system is arranged on the end part of a linear motion control system; the linear motion control system is fixedly arranged on the bracket and parallel to the axis of the thin-wall cylinder; a laser head of the laser vibrometer is arranged on the bracket and opposite to the inclined surface of the right-angle prism with the 45-degree angle; the laser vibrometer is connected with the data acquisition system; the laser vibrometer is connected with the thin-wall cylinder by an elastic top rod. The thin-wall cylinder modal test system and method disclosed by the invention have the advantages of high test precision and test efficiency for the thin-wall cylinder vibration modal.

Description

technical field [0001] The invention relates to a thin-walled cylinder modal test system and method for single-point laser continuous scanning vibration measurement. Background technique [0002] Due to the advantages of light weight, high production efficiency and high reliability, the thin-walled cylinder has been more and more widely used in industrial production, especially in the field of aerospace, such as the casing of aero-engines. However, since the wall thickness of the thin-walled cylinder is usually small relative to the overall size, and the general rigidity is small and the area is large, it is easy to vibrate during the operation of the mechanical system, which will cause interference between mechanical parts, vibration noise, or in the mechanical system. The long-term movement of the machinery will lead to mechanical failure, and excessive vibration will even cause devastating accidents, resulting in irreparable losses. [0003] At present, the most commonly...

AI Technical Summary

Problems solved by technology

However, if the mass of the thin-walled cylinder driven by the rotating table is too large, some irrelevant vibrations will inevitably be introduced during the rotation measurement process.

For example, for the modal measurement of the engine casing of an aircraft, if this method is used, it is difficult to ensure the accuracy of the measurement, so this method has certain limitations

[0005] In the modern market competition environment, the main determinants of development are time and cost. The development direction of experimental research is to provide a more complete set of data from experiments in a shorter time, so as to improve the overall efficiency and efficiency in the model update process. Reliability, so the existing modal test methods for thin-walled cylinders are bound to fail to keep up with the development of the market

Images