Method of Simulating Rotor Blade Amplitude and Rotational Speed ​​Signal in Engine Working State

Abstract

The invention belongs to the engine blade testing technical field and provides a method for simulating the vibration amplitudes and speed signals of rotor blades under the working state of an engine.According to the method, on the basis of blade tip timing measurement technology, the vibration of the rotor blades is simulated through using the deviation of time when the vibration of the rotor blades arrives at a sensor; initial pulse signals and delay deltat pulse signals are designed; the initial pulse signals and the delay deltat pulse signals are fitted during two adjacent turns of rotation of rotation speed pulse signals, so that a condition that the blades do not generate vibration during the first turn of rotation and generate vibration at the next turn of rotation can be simulated,so that fitted pulse signals can be obtained; and set parameters and the vibration amplitudes of the blades are adjusted, so that blade vibration under different conditions can be simulated. With themethod adopted, rotation speeds and blade pulse signals under conditions of different number of blades, rotation speeds and blade tip diameters can be triggered; simulated rotation speeds and blade pulses can be synchronously triggered and outputted; and the vibration amplitudes of the rotor blades under the working state of the engine can be simulated.

Description

technical field [0001] The invention relates to the technical field of engine blade testing, in particular to a method for simulating the rotor blade amplitude and rotational speed signals in the working state of the engine. Background technique [0002] Aeroengine rotor blades are one of the core components of the engine, and their strength is related to the operation safety of the entire engine. At present, in China, the non-contact blade amplitude test system has been widely used in aero-engine ground bench test and component test rotor blade vibration test. But there is no means of calibration for the accuracy of the non-contact blade amplitude measurement. [0003] The existing technical scheme uses a function signal generator as the source of the initial signal, and through a certain logical relationship, the initial signal sent out is fitted and triggered according to the rotation speed and the blade pulse form, which has the following defects: [0004] 1. This meth...

AI Technical Summary

Problems solved by technology

[0004] 1. This method cannot perform corresponding simulations according to different settings of parameters such as the number of blades, rotational speed, and blade tip diameter of the engine rotor blade system;

[0005] 2. For low and medium speeds and low number of blades, this method can meet a certain pulse accuracy, but for high speeds and high number of blades, pulses are prone to increase or loss, and the accuracy of the fitted pulse signal cannot meet the test need;

[0006] 3. The blade and speed pulse signal cannot be frequency-locked and phase-locked;

[0007] 4. This method is also unable to simulate the vibration amplitude of the rotor blades in the working state of the engine

Images