An FFT-Based Detection Method of Engine Blade Tip Clearance
A technology of blade tip clearance and detection method, which is applied in the direction of measuring devices, instruments, and electric devices, etc., which can solve the problems of vibration interference and large calculation, loss of sensor output signal, sensor failure, etc.
Active Publication Date: 2021-01-29
善测(天津)科技有限公司
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In recent years, in order to measure the tip clearance of the engine, a variety of measurement methods have been developed at home and abroad. The characteristics of the engine’s fast speed and many blades make the calculation of the tip clearance detection of the engine relatively large; at the same time, due to the intense vibration during the operation of the engine, Therefore, there are often a large number of vibration pulses in the output signal of the sensor, which interferes with the measurement results; in addition, the engine vibration will cause the sensor to fail, and then cause the output signal of the sensor to lose a certain blade tip clearance pulse, which directly leads to an error in the measurement result; traditional blade tip The clearance detection method does not effectively address the vibration interference in the tip clearance measurement process and the calculation amount is large, so a tip clearance detection method and device that can resist interference and have a small calculation load is very important
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0079] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0080] The main purpose of the present invention is to utilize capacitive sensor 1 in conjunction with FFT algorithm to realize the accurate detection to engine blade 2 blade tip clearances, mainly divide three aspects: (1) measure engine blade tip clearances quickly and accurately; The vibration pulse interference signal 6 caused by the vibration, and remove the interference of the vibration pulse; (3) judge whether the capacitive sensor 1 fails, and remove the wrong result caused by the failure number;
[0081] In the first step, for the tip clearance value of the engine blade, the measurement process is as follows:
[0082] Assuming that the engine has M blades in total, when the i-th engine blade 2 passes through the capacitive sensor area, a capacitor is formed between the upper surface of the blade and the lower surface of the capacitive sensor 1,...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for detecting engine blade tip clearance based on FFT. The detection device includes an engine blade, a capacitance sensor and a modem. The detection method includes the following steps: S1. The capacitance sensor determines the i-th engine blade through the following formula Capacitance value; S2, the modem converts the capacitance C in S1 into the change of voltage V according to the following formula; S3, for the i-th blade tip clearance pulse signal f i (t) Obtain the tip clearance value L of the i-th blade according to the following FFT Fourier mathematical model 0 -R i S4, step of judging the vibration pulse interference signal caused by engine vibration; the present invention can accurately measure the blade tip clearance and automatically identify the vibration pulse interference signal, and accurately judge the sensor output failure based on FFT engine blade tip clearance Detection method and device.
Description
technical field [0001] The invention belongs to the field of engine blade tip clearance detection, in particular to an engine blade tip clearance detection method based on FFT (fast Fourier transform). Background technique [0002] Radial clearance control of engine rotor blades is a very important link to improve engine aerodynamic performance and improve engine efficiency. According to relevant statistics: for every 1% increase in blade tip clearance, the engine efficiency will decrease by 1.5%, and for every 1% decrease in engine efficiency, the fuel consumption rate will increase by approximately 2%. Therefore, the control of engine tip clearance is very important. In recent years, in order to measure the tip clearance of the engine, a variety of measurement methods have been developed at home and abroad. The characteristics of the engine’s fast speed and many blades make the calculation of the tip clearance detection of the engine relatively large; at the same time, du...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/15
CPCG01B7/15
Inventor 段发阶王宪全蒋佳佳李芳怡孙中波李春月卜令冉党文杰
Owner 善测(天津)科技有限公司