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This paper focuses on the study of nonlinear and non-stationary characteristics of the fault vibration signal of roller bearing. Based on improved Local Mean Decomposition (LMD) and Chirp-Z Transform (CZT), a novel hybrid fault feature extraction method is proposed. Firstly LMD is used to decompose the original vibration signal into several product functions (PF) components with physical meaning....
The use of port shore electricity when the ship is in port, which has a very important environmental and economic value. Ship charging pile is an important part of shore power system, according to the characteristics of the Yangtze River inland port, a new type of intelligent low-voltage shore power charging pile is designed. The overall structure and appearance of the charging pile are designed in...
EDEM is a discrete element simulation software based on discrete element theory of contact mechanics model. Because of the its difference from traditional models, such as Bulk Mechanical Models, and Continuum Mechanics Models, the simulation results are not always consistent with the actual results in the simulation of granular material transport inconsistent. Thus, obtaining parameters is very important...
This article includes the principle of frequency control of motor speed and the Universal Serial (short for USS below) interface protocol. And design of the intelligent braking system based on USS interface protocol will be introduced from the principle of intelligent braking system based on frequency control of motor speed, composition of hardware, software designing and the realization of communication...
The parallel grooved multi-layer drum is regarded as the research object in this paper. The parametric design system is developed for the parallel grooved multi-layer drum to realize the parametric design of 3D model. Based on the research of the load characteristics of parallel grooved multi-layer drum, the model designed by the parametric generation system is imported into ANSYS Workbench to simulate...
The normally engaged brake can't be controlled during braking and can't change its braking torque according to the change of loads and speed. For the structure characteristic of the traditional normally engaged brake, an intelligent control strategy about the closed-loop control of angular velocity of the high speed spindle (HHS) is proposed, so that it can adjust the brake motor speed according to...
Taking the Megawatt Wind Turbine Gear Increaser as research object, the dynamics model was constructed by the software of SOLIDWORKS and ADAMS. STEP function was applied to simulate the driving rotation and load. Carried out FFT transform to the key components, and obtain the curves in time domain and frequency domain about meshing force. Compared with the theoretical analysis results, the simulation...
Giant magnetostrictive actuators (GMA) are widely applied in ultra-precision positioning. However, the accuracy of GMA in positioning is intensively affected by hysteresis and nonlinearity of giant magnetostrictive materials. To characterize the hysteresis and nonlinearity, The nonlinear model of GMA based on modified Preisach model was established in this paper. Since the operation of Preisach model...
Aimed to lack of incarnating the contents of driving knowledge in the distributed vehicle driving simulator (VDS), such as road sign, Highway Code and driving skill, this paper brings forward the framework of driving knowledge expert system based on WEB, assorts the driving knowledge, and constructs driving knowledge database which may interface timely. Thus, the driving knowledge can be melted in...
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