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Hangzhou, China

Kang J.,China Jiliang University | Dong X.,China Jiliang University | Zhao C.,China Jiliang University | Zhao Y.,Zhejiang Tianma Bearing Co.
2011 Symposium on Photonics and Optoelectronics, SOPO 2011 | Year: 2011

A Sagnac loop sensor with a long-period grating (LPG) inscribed in polarization maintains fiber (PMF) for refractive index (RI) and temperature measurement is proposed. Taking using of the different responses of the LPG and the Sagnac loop to RI and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of the resonance peaks. One of the transmission minimum of the Sagnac loop sensor was measured, whose wavelength varied with temperature and the intensity changed with refractive index. The experiments show that sensitivity of RI and temperature are 49.9 dB/RIU and -0.65 nm/°C, respectively. The sensor system shows advantages of high sensitivity, small size and low cost. © 2011 IEEE.


Kang J.,China Jiliang University | Kang J.,University of Shanghai for Science and Technology | Dong X.,China Jiliang University | Zhao C.,China Jiliang University | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

A Sagnac loop sensor with a long-period grating (LPG) inscribed in polarization maintains fiber (PMF) for simultaneous strain and temperature measurement is proposed. Taking using of the different responses of the LPG and the Sagnac loop to strain and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of resonance peaks. The experiments show that sensitivity of strain and temperature are 6.4×10 -3 dB/με and 0.65 nm/°C, respectively. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).


Cui L.,East China University of Science and Technology | Shi D.F.,Zhejiang Tianma Bearing Co. | Zheng J.R.,East China University of Science and Technology | Song X.G.,East China University of Science and Technology
Advanced Materials Research | Year: 2014

Considering backlash, radial clearance of bearing and time-varying mesh stiffness, nonlinear dynamic model of gear bearing rotor system is established considering unbalance and loosening fault. Nonlinear dynamic equations are solved using Runge-Kutta method and Newton-Raphson method. Numerical simulations of the dynamic equations and the affection of the depth of crack and length of wear to the nonlinear dynamic behavior are studied. The results shows that tooth off, bilateral impact phenomenon are occurred, with increasing gear failure when unbalance occurs, and the gear system exhibits a diverse range of periodic, quasi-periodic and chaotic motion. When loosening fault occurs, the range of chaos motion is increased, and gear burnishing is also intensified. © (2014) Trans Tech Publications, Switzerland.


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Trademark
Zhejiang Tianma Bearing Co. | Date: 2008-03-18

Bearings being parts of machines, namely, ball-bearings, roller bearings, ball rings for bearings, bearings for transmission shafts, ball rings for bearings.


Qian D.-S.,Wuhan University of Technology | Qian D.-S.,Huazhong University of Science and Technology | Qian D.-S.,Zhejiang Tianma Bearing Co. | Shi D.-F.,Zhejiang Tianma Bearing Co. | And 2 more authors.
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2013

Wind power bearing is the key part of wind power devices. As the crucial component of bearing, the bearing ring plays a decisive role in the life and the reliability of the devices. Radial axial ring rolling is an advanced rotary plastic forming technology for manufacturing large seamless bearing rings, slewing bearings and flange rings. Currently, the bearing ring raceways of many typical ball bearings used in wind power devices are processed by cutting, which has large material consumption and low productivity. Moreover, the poor distribution of metal flow line weakens the mechanical properties. Focusing on the typical large double-raceway wind power bearing ring, this paper carried out a numerical and experimental study on raceway rolling. The design methods of the main forming parameters were proposed through theoretical analysis of ring rolling at first. Then a coupled thermal-mechanical finite element model for radial-axial rolling of bearing ring was established, and the feeding procedure of the rolling process was optimized by simulation analysis. Finally, the rolling experiment was performed and the qualified bearing ring was successfully rolled based on the simulation result. The research in this paper achieved the direct forming of raceway of large wind power bearing ring by rolling, which could provide an effective technological and theoretical instruction for processing the large bearing rings and slewing bearings in wind power and other fields with savings of material and energy.

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