Microwave-based moving blade tip clearance and vibration parameter fusion measurement device

Abstract

The invention relates to the field of rotating moving blade non-contact vibration measurement, and aims at effectively improving the measurement precision of vibration parameters and achieving the high-precision measurement of blade tip gaps. The technical scheme employed in the invention is that a moving blade tip gap and vibration parameter fusion measurement device based on microwave comprises a microwave sensor and a sensor drive module; the sensor drive module comprises a circulator, a phase-locked loop (PLL), a phase shifter, a frequency mixer, a low-pass filter circuit, a high-pass filter circuit, a single-chip microcomputer MCU, a multiplying unit, an adder, an automatic gain control circuit AGC, a comparator, and an A / D analog-digital signal converter; the device also comprise a data collection module which comprises an FPGA (field-programmable gate array), a digital signal processor (DSP), and an upper computer. The device is mainly used for the non-contact vibration measurement of a rotating moving blade.

Description

technical field [0001] The invention relates to the field of non-contact vibration measurement of rotating moving blades, in particular to a microwave sensor-based high-speed fusion measurement system of moving blade tip clearance and timing parameters. Specifically, it relates to a microwave-based fusion measurement device for tip clearance and vibration parameters of moving blades. Background technique [0002] In large rotating machines such as aero-engines, gas turbines, steam turbines, and flue gas turbines, moving blades are the core working components, and their operating state parameters directly affect the working performance and operating safety of the equipment. Online measurement of blade tip clearance and vibration parameters at high temperatures is It is the key to ensure the working performance and operation safety of the equipment. At present, non-contact rotating blade tip timing vibration measurement technology and blade tip clearance monitoring technology...

AI Technical Summary

Problems solved by technology

[0008] (1) To overcome the shortcomings that the existing tip clearance and tip timing measurement technologies cannot realize the simultaneous measurement of the tip clearance and vibration parameters of the moving blade in the high-temperature, high-speed, high-pollution mechanical operating environment, specifically including: the eddy current method has poor high temperature resistance , the response speed is slow, and it is easily affected by parameters such as mechanical structure, blade shape, and temperature; the measurement accuracy of the optical method is easily affected by oil pollution, and the service life is low; Only suitable for measuring metal blades, the measurement accuracy is easily affected by the dielectric constant of the fluid

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