Investigation Of Acoustic Emission Signal Characteristics Of Main Spindle On Giant Wheel

In recent years, with the rapid development of our economy, the height of the giantwheel has been constantly refreshed, the carrying number of also constantly increasing.It is not only a symbol of the amusement park, but also of the city. At present there are35A-level（height≥50m）giant wheel in China. The main spindle is one of the mostimportant parts of the giant wheel. If it fails, a large accident and casualties will bedirectly caused. There is no effective detection method to the main spindle detection atpresent, the detection of the main spindle online is an urgent problem to be solved forthe safety inspection.Therefore, the study of an effective mechanical fault detection and diagnosismethod to the main spindle, and timely discovery and forecast fault, are importantmeasures to ensure safe operation of the equipment. By referring to the project “TheExplore Search of Acoustic detection to main Spindle on the giant wheel” subsidized bythe12th five-year National Science and Technology Support Program project(No.2011BAK06B05) and AQSIQ Science and Technology plan project(2009QK016),So this article is mainly from the giant wheel simulation device experiment and fieldtest to carry out the acoustic emission inspection to the main spindle on giant wheel,finally we obtain the acoustic emission signal characteristics of spindle system on giantwheel under normal condition, and carry out the research about acoustic emission signalanalysis and feature extraction, the main research contents and conclusions are asfollows:（1）According to the different fault mechanisms rolling bearing produces, faultcan be divided into fatigue, wear and corrosion, agglutination and creasing and fracture,etc. Wear and fatigue is two common fault forms of rolling bearing, all these rollingbearing faults process of produce and the development, will be accompanied by acousticemission phenomenon occurring.（2）The main wheel simulation experiment device in the laboratory can achievespindle system operation in the different operation conditions such as changing load,variable speed, setting fault and so on.（3）The main wheel simulation experiment device in lab runs1160circles, thewhole change trend can be divided into five stages according to the variationcharacteristics of acoustic emission parameters.（4）acoustic emission signal RMS parameters is the most sensitive to the rollingbearing signal, acoustic emission energy, counts, duration time and rise time parameters is the second sensitive to the rolling bearing signal, and the change trend of fourparameters is similar; Acoustic emission amplitude and hit is the least sensitive.（5）the experience figure of the main spindle on giant wheel in Yixing acousticemission energy, ringing count, duration and amplitude course has a bigger peak at acycle, among energy rate is the most obvious.（6）The abnormal noise in the main spindle on giant wheel in Beijing Shijingshancan be located through the acoustic emission technology, location way can choose linearlocation and cylinder location. The acoustic emission characteristics of the abnormalsound on the main spindle are low frequency signals, of which amplitude is high, energyis big, duration time is long.