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Wang X.,Guangzhou Academy of Special Equipment Inspection and Testing | Liang J.,Guangzhou Academy of Special Equipment Inspection and Testing | Qi K.,Guangzhou Academy of Special Equipment Inspection and Testing | Li G.,China Special Equipment Inspection And Research Institute
Springer Proceedings in Physics | Year: 2015

Based on the explicit dynamic analysis method, finite element model of acoustic emission signal propagation of slewing ring is created by using ANSYS/ LS-DYNA software, processing acoustic emission signal as a kind of high frequency stress wave. The propagation law of acoustic emission signal of slewing outer ring is respectively studied from four aspects: amplitude, frequency, energy, and propagation path. The results show that time-domain waveform of acoustic emission signal is distorted through propagating due to the complexity of the propagation path, and frequency components of the signal are dispersed and energy is attenuated at the same time. Compared with the upper and lower surfaces of slewing outer ring, the form of signal energy attenuation of outer surface is relatively simple and can be described as an exponential decay. Therefore, the outer surface is suitable for installing sensors and signal acquisition in the course of acoustic emission testing; however, taking the impact of signal distortion into account, the number of the sensors used in acquisition should not be less than three. © Springer Science+Business Media New York 2015.


He C.-F.,Beijing University of Technology | Zhang J.-J.,Beijing University of Technology | Zhang J.-J.,China Special Equipment Inspection And Research Institute | Shen G.-T.,China Special Equipment Inspection And Research Institute | And 2 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2013

This paper presents acoustic emission experimental research of low-speed rolling bearings on giant wheel simulation device. Statistical analysis of acoustic emission signal parameters have been done both from accumulated and averaged value. The statistical value changes of some parameters showed a tendency of "up-down-level" during the whole process, and the RMS curve is most representative. Then further analysis of peak point signals on RMS curve has been carried out. The RMS-Time graph of signals had a clear four-peak feature and different signals can be distinguished in the Energy-Amplitude graph. These results provided a useful reference data for the future health monitoring of giant wheel bearings.


He B.,Guangdong Jidian Polytechnic | Li H.,Guangzhou Academy of Special Equipment Inspection and Testing | Liao C.,Guangdong Jidian Polytechnic
Lecture Notes in Electrical Engineering | Year: 2011

From the functional requirements of the inspecting and controlling system for the testing platform of CO2 air conditioning, the inspecting and controlling system based on LabVIEW has been designed in this paper. The inspecting and controlling system based on the virtual instrument is composed by the hardware and the computer equipment software system. The hardware includes the data acquisition card, the mass flow sensors, the pressure and temperature sensors, etc. And the computer equipment software system is self-developed, which has taken the LabVIEW software as the platform and that has the virtual panel and testing functions. The inspecting and controlling system can collect, process and store the data of experimental platform as well as control the parameters of air-conditioning testing platform. © 2011 Springer-Verlag.


Li D.,Guangzhou University | Long Z.,Guangzhou Academy of Special Equipment Inspection and Testing | Chen X.,Hitachi Ltd.
Advanced Materials Research | Year: 2011

As people's life quality rise continuously, the fitness industry has developed fast. At present, people mainly focus on the improvement and research of fitness bike's comfort and security, not on the movement manner. Thus it causes the movement process to be drab and boring, which has negative effect on the exercise. Therefore, Shenzhen Institute of Advanced Technology developed a new kind of multifunctional interactive fitness bike. Its characteristic is that both hands and feet can driver it independently, which can add different movement manners. This paper mainly aims at designing a new kind of resistance automatic adjustment system according to its unique drive mode. This system can make the rider obtain smooth and comfortable feel. At last, through the manufacturing and debugging of the prototype of fitness bike, we know this scheme is feasible. © 2011 Trans Tech Publications.


Zhang J.,Guangzhou University | Ji L.,Guangzhou University | Qi K.,Guangzhou Academy of Special Equipment Inspection and Testing
Applied Mechanics and Materials | Year: 2012

Quayside container crane is a main lifting machinery in the seaports, which plays an important role in the trade contacts and transportation. This paper aims at the present security condition of quayside container crane, discusses the health monitoring problem of quayside container crane and introduces the health monitoring technology based on fiber bragg grating sensor, providing theoretical foundation for improving security condition of crane. © (2012) Trans Tech Publications.


Feng Y.-X.,Zhejiang University | Mai Z.-Y.,Guangzhou Academy of Special Equipment Inspection and Testing | Tan J.-R.,Zhejiang University
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2011

The Influencing factors which controlled mechanism motion output were analyzed on the premise of constant motion input. They were represented as kinematic pair chromosome number, kinematic pair feature gene and distance relationship vector gene respectively by borrowing several concepts and principles in genetics, and they were encoded at the same time. Mechanism chromosome model was established which was composed of mechanism chromosome relationship graph and mechanism chromosome matrix. Three kinematic pair chromosome gene recombination operations (dominance, translocation and metastasis) on mechanism chromosome model were proposed by using meiosis and chromosome variance in genetics for reference. Variant mechanism was acquired based on shaper original mechanism by using this method, and its practicality was demonstrated as well.


Song Y.,Zhejiang University | Xu B.,Zhejiang University | Yang H.,Zhejiang University | Liu Y.,Guangzhou Academy of Special Equipment Inspection and Testing
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2014

It is a fact for the secondary source method that the pump source impedance can't be computed with the current estimation algorithm when the transducer length of the reference pipe is multiple times of the pressure wavelength, and the signal processing is complicated and time consuming, so the secondary source method is inapplicable in industry. For solving the problem, a new estimation algorithm of the pump source is discussed, and a signal processing software based on Matlab/GUI for secondary source method is designed. The test principle of the secondary source method is depicted, and then several evaluation methods of source impedance (such as the linear interpolation method, the weighted linear regression technique and the distributed-parameters method) and its application are discussed. With the Matlab/GUI, a signal processing software for the secondary source method is developed and then validated with test results. It can be concluded from the test results that compared with the distributed-parameter method, the computing time of the source impedance with the weighted linear regression Technique is reduced 70%. At the same test accuracy, the signal processing of the secondary source method is simplified and the computing time is reduced 80% by the software. Therefore, with the signal processing software, the application of the secondary source method in industry is possible. © 2014 Journal of Mechanical Engineering.


Chen G.,South China University of Technology | Lin Y.,South China University of Technology | Wang X.,Guangzhou Academy of Special Equipment Inspection and Testing | Liang J.,Guangzhou Academy of Special Equipment Inspection and Testing
Natural Gas Industry | Year: 2015

In order to evaluate objectively and systematically the explosion risk of explosion-proof electric apparatus in typical industrial sites, a complete index system was established for evaluating the risk possibility, and an explosion risk evaluation method was also put forward on the basis of combination weighting. The evaluation was divided into three steps. Firstly, with the opinions of industrial experts as reference, an evaluation index system of explosion risk possibility was established after an analysis was conducted on the critical technical parameters of explosion-proof electric apparatus. The weights for each index were obtained by means of combination weighting which combines AHP with CV, and state score for evaluation index was obtained through Delphi method and site investigation. Then, a calculation model was built for explosion risk possibility of the system composed of explosion-proof electric apparatus and their surroundings by using fuzzy mathematics and probability theory. Secondly, based on the features of different process equipment, explosion risk consequence was determined with the aid of process equipment classification, ETA and fire explosion hazard consequence model. Considering the explosion risk possibility and consequence, the risk of the whole system was characterized by using risk matrix. Finally, the above mentioned evaluation method was used to analyze the explosion risk of explosion-proof electric apparatus in typical industrial sites, and the corresponding risk decision program was put forward so as to provide the reference and guide for the site management and inspection of explosion-proof electric apparatus. ©, 2015, Natural Gas Industry Journal Agency. All right reserved.


Lin C.,Guangzhou Academy of Special Equipment Inspection and Testing | Wang X.,Guangzhou Academy of Special Equipment Inspection and Testing | Wang W.,Guangzhou Academy of Special Equipment Inspection and Testing
Proceedings - 2013 International Conference on Mechatronic Sciences, Electric Engineering and Computer, MEC 2013 | Year: 2013

FECMS is an important means to promote safety and energy saving for elevators in use. This paper introduces a kind of intelligent FECMS for elevators, includes a new elevator fault monitoring method based on current feature, the improved recognition algorithm based on template matching to monitor the running status of elevator, the development of the elevator fault and energy consumption monitoring terminal. It realizes intelligent identification of the running status, fault alarm and energy consumption monitoring. Results shown that the system fulfills design requirements of monitoring, works stable, alarm timely and effective. © 2013 IEEE.


Chen G.-H.,South China University of Technology | Liang J.,South China University of Technology | Liang J.,Guangzhou Academy of Special Equipment Inspection and Testing | Wang X.-H.,Guangzhou Academy of Special Equipment Inspection and Testing
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2013

In this paper, the acoustic emission source with slewing ring is roughly located via a linear time-difference-of-arrival (TDOA) location method. Then, in order to overcome the low precision resulting from the threshold-based TDOA estimation and improve the location accuracy of acoustic emission source, a correction signal is constructed, and the corresponding smooth pseudo Wigner-Ville distribution (SPWD) is calculated to obtain a correction value of the threshold-based TDOA. The results show that the corrected TDOA helps to improve the location accuracy of the acoustic emission source with slewing ring, with a maximum absolute error decreasing from 23.63 mm to 11.57 mm.

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