A laser shaft alignment system with dual PSDs

Jiao, Guohua; Li, Yulin; Zhang, Dongbo; Li, Tonghai; Hu, Baowen

doi:10.1631/jzus.2006.a1772

Cited by 6 publications

(1 citation statement)

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“…Recently, the laser alignment system has been adopted for more and more precise shaft alignments, such as gas turbine (Luedeking, 2005), wind turbine generator (Mankowski and Wang, 2013). The single PSD laser alignment system and dual PSDs method have been applied in actual shaft alignment (Jiao et al, 2006a;Jiao et al, 2006b). The principle of the proposed laser alignment process was based on that of the traditional dial indicator method.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental research on turbo-generator shaft alignment using strain gauge method

Zhang

Yang

et al. 2016

Journal of Vibration and Control

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Shaft alignment is a key factor for the safe and reliable operation of a turbine unit. This paper presents an approach to estimate the turbo-generator shaft alignment using strain gauge technique with two measuring sections nearby each coupling. The change of shaft bending moment is linearly proportional to the change of bearing elevation and reaction force. So the bearing load distribution can be identified from the strain values and bending moments which are measured using strain gauge. The transfer matrix method is used to calculate the detailed shaft alignment data including deflection, slopes, bearing reaction forces, influence coefficients, sag/gap values. Experiments were carried out on a test rig with 3 rotors, 2 couplings and 6 bearings. It was shown that the strain gauge identification results agree well with the results using the jack-up method. The maximum relative error of each bearing loads is almost 8.7%. The sag/gap values using the strain gauge method are close to those using the laser alignment method. The maximum relative error is less than 7.5%. Results also show that the strain gauge method is sensitive to possible disturbances in the bearing elevation. In the end, strain gauge alignment technique with two measuring sections nearby each coupling was applied on the shaft alignment estimation of a 600 MW turbine unit successfully. The bearing loads and shaft deflection were obtained accurately .

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Section: Introductionmentioning

confidence: 99%

Theoretical and experimental research on turbo-generator shaft alignment using strain gauge method

Zhang

Yang

et al. 2016

Journal of Vibration and Control

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A method for calculating the center position of collimated light

Cang

et al. 2008

Optoelectron. Lett.

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It is a key problem to accurately calculate beam spots' center of measuring the warp by using a collimated laser. A new method, named double geometrical center method (DGCM), is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device (CCD) is employed to receive the diffraction-beam spots, then the geometrical centers of the first and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What's more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.

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