A turbocharger compressor impeller blade vibration pitch line accurate determining method

Abstract

The invention relates to a turbocharger compressor impeller blade vibration pitch line accurate determining method. The method comprises the steps of initially determining the first-order vibration pitch line position of compressor impeller blades based on a three-dimensional model of compressor impellers by using a simulating calculation method; arranging strain gauges on the surfaces of the compressor impeller blades and performing a compressor impeller blade shock excitation test; by analyzing the strain measurement value of each strain gauge in the compressor impeller blade shock excitation test and determining the key points of the first-order vibration pitch line position of the compressor impeller blades; further determining a first-order vibration pitch line of the turbocharger compressor impeller blades according to the positions of the key points by using a spline curve. The method can accurately determine a vibration pitch line of turbocharger compressor impeller blades and provide scientific proof for the structural optimization design of compressor impellers and the quality inspection of compressor impeller products.

Description

technical field [0001] The invention belongs to the technical field of structural reliability of a turbocharger, in particular to a method for accurately measuring the vibration pitch line of a turbocharger compressor impeller blade. Background technique [0002] The turbocharger is one of the key components for the diesel engine to increase the power density and improve the adaptability of the plateau environment. As one of the core components of a turbocharger, the compressor wheel has an important influence on the reliability of the entire turbocharger. Blade vibration fatigue fracture is a typical failure mode of turbocharger compressor impeller, especially when the turbocharger works with the vehicle engine at high altitude, the working speed of the turbocharger will generally increase. As a general trend, the increase of the speed of the turbocharger will increase the risk of blade vibration fatigue fracture of the compressor impeller. Once the turbocharger compresso...

AI Technical Summary

Problems solved by technology

Blade vibration fatigue fracture is a typical failure mode of turbocharger compressor impeller, especially when the turbocharger works with the vehicle engine at high altitude, the working speed of the turbocharger will generally increase. As a general trend, the increase of the speed of the turbocharger will increase the risk of blade vibration fatigue fracture of the compressor impeller

Once the turbocharger compressor impeller breaks due to blade vibration fatigue, it will not only cause damage to the turbocharger, but also make the engine unable to work normally

Images