The high temperature modal test technology of engine turbine blades based on 3D laser scanning technology was presented

which realized the modal test of turbine blades at high temperature of up to 900 ℃. A set of high temperature environment simulation device was designed to realize the simulation of different temperature environments. Based on the basic excitation technology of the shaking table and 3D laser scanning technology

the 3D test models of turbine blades under different temperature environments were established

the accurate modal shape

modal frequency and other parameters were obtained

by which the feasibility of the method was verified. The analysis results showed that the natural frequency of turbine blades decreased due to the increase of temperature

and the first-order frequency decreased by 6% compared with the ambient temperature at 900 ℃

The modal shape of blade tip was slightly distorted due to thermal stress.