Results 11 to 20 of about 233 (128)

An Improved Blade Vibration Parameter Identification Method considering Tip Clearance Variation

Shock and Vibration, 2021
Blade tip timing (BTT) technology is the most effective means for real-time monitoring of blade vibration. Accurately extracting the time of blade tip reaching the sensors is the key to ensure the accuracy of the BTT system. The tip clearance changes due
Liang Zhang, Qidi Wang, Xin Li
doaj   +3 more sources

High-Precision Extraction Method for Blade Tip-Timing Signal with Eddy Current Sensor

International Journal of Rotating Machinery, 2020
Online monitoring of high-speed rotating blades has always been a hot topic. Of the various methods, the blade tip timing (BTT) technique, based on eddy current sensors, is considered to be the most promising.
Ji-wang Zhang, Ke-qin Ding, Guang Chen
doaj   +3 more sources

Identification of Blade Vibration Parameters Based on Improved Composite Reference Blade Tip-Timing Method [PDF]

Sensors
As the core component of an engine, the vibration characteristics of blades directly affect the stability and lifespan of the engine. Thus, monitoring the vibration status of the blades is essential.
Liang Zhang, Xue Hu, Yitong Zheng, Wei Huang, Wenlong Yang   +4 more
doaj   +3 more sources

Undersampled Blade Tip-Timing Vibration Reconstruction under Rotating Speed Fluctuation: Uniform and Nonuniform Sensor Configurations

Shock and Vibration, 2019
Blade tip-timing (BTT) is a promising method of online monitoring rotating blade vibrations. Since BTT-based vibration signals are typically undersampled, how to reconstruct characteristic vibrations from BTT signals is a big challenge.
Zhongsheng Chen, Jing He, Chi Zhan
doaj   +3 more sources

Compressed Sensing-Based Order Analysis for Blade Tip Timing Signals Measured at Varying Rotational Speed

Shock and Vibration, 2020
Monitoring the vibrations of high-speed rotating blades is significant to the security of turbomachineries. Blade tip timing (BTT) is considered as a promising technique for detecting blade vibrations without contact online.
Suiyu Chen, Yongmin Yang, Haifeng Hu, Fengjiao Guan, Guoji Shen, Faming Yang   +5 more
doaj   +3 more sources

Accuracy Evaluation Method for Blade Vibration Measurement in Blade Tip Timing Based on Direct Calibration Using Time of Arrival [PDF]

Sensors
Non-contact blade vibration measurement based on blade tip timing (BTT) is a signature method for health monitoring in large rotating machinery. Time of arrival (ToA), as the fundamental data in BTT, directly impacts the accuracy of subsequent vibration ...
Qi Zhou, Guangyue Niu, Meiru Liu, Guangrong Teng, Fajie Duan, Fangyi Li, Hao Liu, Fafu Li   +7 more
doaj   +3 more sources

Vibration Parameters Identification of Rotating Blades Based on Blade Tip-Timing Sensor Waveforms

Applied Sciences, 2023
Blade tip-timing is one of the most widely used non-contact measurement methods for rotating blade vibration. The classic blade tip-timing method is to identify the vibration parameters of the blade based on the time of blade tip arrival to the tip ...
Liang Zhang, Qidi Wang, Xin Li
doaj   +2 more sources

A novel method for noise reduction of blade tip timing signals based on sparse representation and dictionary learning

Journal of Low Frequency Noise, Vibration and Active Control
Blade Tip Timing Technology (BTT) is a new type of blade vibration measurement method with non-contact measurement capabilities, which is associated with high efficiency and convenience.
Hua Zheng, Guanyu Fang, Shiqiang Duan, Hang Li   +3 more
doaj   +3 more sources

Blade Crack Diagnosis Based on Blade Tip Timing and Convolution Neural Networks

Applied Sciences, 2023
The diagnosis of blade crack faults is critical to ensuring the safety of turbomachinery. Blade tip timing (BTT) is a non-contact vibration displacement measurement technique, which has been extensively studied for blade vibration condition monitoring ...
Guangya Zhu, Chongyu Wang, Wei Zhao, Yonghui Xie, Ding Guo, Di Zhang   +5 more
doaj   +2 more sources

Dynamic Characteristics Analysis of 3D Blade Tip Clearance for Turbine Blades with Typical Cracks

International Journal of Aerospace Engineering, 2022
As well known, the crack is a typical fault of turbine blades, which is difficult to detect due to the weak fault features contained in the rotor vibration.
Xiaodong Zhang, Yiwei Xiong, Xin Huang, Bochao Fan, Zhen Zhao, Jiahao Zhu   +5 more
doaj   +2 more sources