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Blade tip timing is another non-contact measurement method. Chen et al. proposed a reconstruction method for the blade tip timing signal to detect cracks. Du et al. simulated the crack on a rotor blade and used a stochastic hybrid blade tip timing approach to identify the blade damage.
Blade tip clearance (BTC) measurement and active clearance control (ACC) are becoming crucial technologies in aero-engine health monitoring so as to improve the efficiency and reliability as well as to ensure timely maintenance.
As can be found from the review, it is very difficult to detect full-scale blade damages by using contact techniques due to wiring and the limit of the small detection area, such as the techniques based on strain measurement, acoustic emission and traditional ultrasonic methods.
It is possible to monitor crack propagation by the natural frequency shift of blades. However, natural frequencies cannot directly reflect the damage of blades. It is intuitive to use the crack length as an indicator for blade condition monitoring. In this section, crack length is used to reflect the damage of blades.
When the rotating blade sweeps over the eddy current probe, a variation of magnetic flux induces eddy currents in the metal surface of the blade tip, which forms a secondary magnetic field and changes the current in the sensor coil ( Figure 1 b).
A linear time-varying differential equation of the blade vibration is calculated by the Newmark- β method to generate the simulated signals. At constant speed, synchroextracting transform can detect the natural frequency shift of the blade earlier than short time Fourier transform.
Damage detection of the blade is considerably important to blade inspection during operation, because the size and the structural complexity of turbine blades have …
Bacharach Leak Detection; Danfoss Leak Detection; Spectroline Leak Detection; HRP Sales Management; Contact; ... MRC+(LT) Fan Motors, Blades and Capacitors Fan Motor and Blade …
Capacitive measurement technology obtains the blade tip clearance by detecting the change of capacitance between the pole core of the sensor and the blade end face.
Defect detection is a critical element in the PCB manufacturing process. Different from surface mount PCB, the components on the plug-in PCB are usually installed …
Firstly, common types of blade damages are summarized and the corresponding causes and consequences are analyzed. Then different measurement techniques of blade conditions are …
Capacitive measurement technology obtains the blade tip clearance by detecting the change of capacitance between the pole core of the sensor and the blade end face.
After 300 s, the blade crack is detected by synchroextracting transform. Finally, in order to reveal the damage of the blade, the crack length is estimated qualitatively by …
A demonstration of YOLO in the same field but for object detection and more specifically detection and localization of capacitors in PCB is discussed in [10] where the …
A Novel Intelligent Fault Diagnosis Approach for Early Cracks of Turbine Blades via Improved Deep Belief Network Using Three-Dimensional Blade Tip Clearance
After 300 s, the blade crack is detected by synchroextracting transform. Finally, in order to reveal the damage of the blade, the crack length is estimated qualitatively by …
Blade tip timing (BTT) is a noncontact blade vibration measurement technique, which is widely used in recent years. In this article, a procedure of crack detection using BTT …
This paper proposes a capacitor detection method based on YOLO algorithm for printed circuit board (PCB) assembly. YOLO is a kind of fast object detection method based on convolutional …
To further test the effectiveness of the proposed method for capacitor appearance detection, we tested some images with the resolution size set to 640*640.The …
Principle of blade tip clearance (BTC) measurement: (a) bladed disk and eddy current sensor (ECS); (b) electromagnetic interaction between the blade tip and the sensor …
Principle of blade tip clearance (BTC) measurement: (a) bladed disk and eddy current sensor (ECS); (b) electromagnetic interaction between the blade tip and the sensor …
To validate the advantages of the proposed method in the credible detection of blade crack damage, this paper compares it with classic algorithms in XAI, including logistic regression …
A Novel Intelligent Fault Diagnosis Approach for Early Cracks of Turbine Blades via Improved Deep Belief Network Using Three-Dimensional Blade Tip Clearance
An in depth overview of structural monitoring for blade damage detection has been published by McGugan et al. 12 Moreover, ... An active rectifier, buffer capacitor and …
Blade tip clearance (BTC) measurement and active clearance control (ACC) are becoming crucial technologies in aero-engine health monitoring so as to improve the efficiency …
First, in terms of wind turbine blade state detection, this paper builds blade models based on the normal state and three common fault types, including blade angle …
A blade analyser unit (BAU) originally developed by Killeen et al. accurately measured the peak output voltage from the capacitance probe demodulator. This enables one …
A novel self-adaptive, multi-peak detection algorithm for blade tip clearance measurement based on a capacitive probe; Online monitoring of dynamic tip clearance of …
The coils and the brushes in motors tends to cause quite a lot of electrical noise. Proffieboards already have a lot of filter capacitors, so it should be be fine, but it''s not hard to …
Laflamme et al. [61] formulated a strategy for damage detection composing of soft elastomeric capacitor (SEC) with low costs to measure surface strains, ... Damage …