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Meng L.,Wuhan University of Technology | Tan Y.,Wuhan University of Technology | Zhou Z.,Wuhan University of Technology | Liang B.,Shenyang Institute of Engine Design | Yang W.,Huazhong University of Science and Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

The FBG detection technique has several advantages of FBG in electromagnetic interference immunity, distributed sensing and the ultrasonic features such as good directivity, high penetrating power. A review of the FBG high speed demodulation method, FBG strain transferring characteristics and sensitivity property was given as well as the application of this technique in health monitoring was analyzed. Finally, the existing problems and future directions were outlined and proposed.


Liu Q.-L.,Jilin University | An Y.-X.,Shenyang Institute of Engine Design | Li X.-Y.,Jilin University
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | Year: 2011

Variable cross-section components are widely used in engineering practice. This variable section widget for reliability and sensitivity variation, We study the change the rule of reliability and sensitivity of normal distribution for the variable section. We propose a method on the variable section reliability and sensitivity. We may rapid obtain the variable cross-section component's reliable sensitivity information accurately, in basic random variable probability characteristic certain situation. Through the value example, we have studied the random variable reliable sensitivity for dangerous section, discussed the random variable average value, (association) variance reliable sensitivity positive and negative. We propose a method with practicality.


Feng G.-Q.,Dalian University of Technology | Feng G.-Q.,Shenyang Institute of Engine Design | Zhou B.-Z.,Dalian University of Technology | Zhou B.-Z.,Shenyang Institute of Engine Design | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

The bearing misalignment of an inner-and-outer dual-rotor system of an aero-engine was studied. The whole rotor model including the connection of the internal supporting bearings between the outer and the inner rotors was established with the finite element method based on rotor dynamics. With numerical calculation, the natural frequencies and modes of the inner-and-outer dual-rotor system were obtained. The vibration responses of the rotor system were analyzed under different misalignments and different rotating speeds in cases of different misaligned outer supporting bearings of the out rotor, i.e., the higher pressure rotor.


Feng G.,Dalian University of Technology | Feng G.,Shenyang Institute of Engine Design | Zhou B.,Shenyang Institute of Engine Design | Lin L.,Northeastern University China | Han Q.,Northeastern University China
Advanced Materials Research | Year: 2011

The angular misalignment of a three-point supported dual-span rotor system is discussed. Vibration measurement for coupling misalignment is taken in this paper by using the model test rig, and the rotor vibration response characteristics with different misalignment quantities and different rotating speed are compared. Based on the finite element method, researches on the three-point supported dual-span rotor system are made, and then the simulation and experimental results are compared. Both the simulation and the measurement are compared to show the features. The results show that the amplitudes of the misaligned rotor vary with rotating speeds and misalignment angles, and the center orbits of the misaligned rotor change into ellipses with the increase of misalignment, together with double harmonic responses.


Jiang L.,Hunan University of Science and Technology | Zeng B.,Hunan University of Science and Technology | Feng G.,Shenyang Institute of Engine Design | Li X.,Hunan University of Science and Technology
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2013

Denoising is an essential part of signal process, because the inevitable noise are easy to mix in useful signal during raw signal acquisition that always affect the accuracy of analytical results. New denoising methods are studied continuously to develop the signal process technology. The unique feature of kernel independent component analysis (KICA) method, which can separate independent components from mixed signal source, is used for denoising. The noises and useful signals can be separated as independent components by KICA, then, choosing useful signals to reconstruct, the denoising process can be achieved. By introducing adaptive noise components, the noise of rotor unbalanced vibration signal is cancelled. The results demonstrate the validity of KICA based denoising method.

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