Simulation and experimental study of the blade vibration monitoring (BVM) method based on blade tip timing

抄録

In the present paper, the blade vibration monitoring (BVM) method and the system products based on blade tip timing were studied and demonstrated in detail in the following four aspects: (1) Based on the finite elemental method (FEM) simulation calculations, the variation principle of the vibration characteristics after blade cracks, bumps and other faults was investigated to verify the feasibility of the BVM method. (2) Based on the simulation calculation of the test blade, the blade vibration monitoring experiment was conducted on a small rotor test bench. The effectiveness of the current monitoring system function is verified by the blade spectrum identification. (3) Based on the real long blade of a steam turbine unit, the vibration monitoring test verification of the long blade of steam turbine was conducted. The key problems such as sensor installation, signal conditioning, data acquisition and data analysis were experimentally studied, providing a technical support for product engineering. (4) Combined with the demonstration power plant, the on-site debugging and verification test of the BVM system were conducted to confirm the reliable application of the BVM system.