摘要：
Based on the dynamic analysis of 5XF150/180 type grain cleaning machine, the two sieve bodies' boundary conditions for finite element analysis are determined. The natural frequency and vibration mode of sieve bodies were identified by modal analysis by the use of ANSYS Workbench. Based on the result of modal analysis to make harmonic response analysis, the steady-state kinetics characteristics under the actual working frequency can be determined. The results verify the reasonable of the design and selection of main dynamic parameters of vibrating screen.
关键词：
Road irregularities;Non-stationary random process;Time domain modeling;Wavelet analysis;Time-frequency characteristics
摘要：
By using time domain modeling obtained from PSD for stationary random road irregularities, concerning about non-uniform moving-vehicle conditions and non-stationary road characteristics, via model assembly and integration to generate non-stationary random road time domain modeling for inputting road excitation. On the assembly of the non-stationary random road time domain modeling, Time-Frequency was analyzed via wavelet analysis. From road data decomposed by the way of Wavelet, both time domain characteristics of signal components in different bands can be obtained and anomaly contained within the signal can also have accurately time-frequency localization. The signal separation can help achieving non-stationary sub-band analysis, and can further study the affection of road signal in different band focus on vibration response of the vehicle, and also providing a strong theoretical basis for road design, quality inspection and grading.
期刊：
Proceedings - 3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011,2011年1:1092-1095
通讯作者：
Liang, H. C.(hcl@whpu.edu.cn)
作者机构：
[Guo, Weifeng; Liang, Hou Chuan; Zhang, Yonglin; Hu, Zhigang] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, Hubei, China;[Hu, Zhigang] CAD Center, Huazhong University of Science and Technology, Wuhan 430071, Hubei, China
摘要：
Based on the white noise filtration method, the time domain model of stochastic road irregularities was established including the model of multipoint time-delay correlative excitation from the same track and the model of space-coherance excitation from the bilateral tracks of a vehicle on the road. Further the development was made from the time domain model of one dimensional road irregularities to two-dimensional road surface and the simulation realization completed in MATLAB environment. The case studies demonstrated that the digital road surface characteristics simulated by white noise filtration was consistent with that of a standard grade road surface, thus formed virtual road surface which provided digital road environment efficiently and conveniently for virtual prototyping (VP) and virtual proving ground (VPG) of vehicles.<br/>
摘要：
Based on the power spectral density (PSD) function of stochastic irregularities of the standard grade road and by means of inverse fast Fouerier transform (IFFT) based on discretized PSD sampling, an equivalent sample of stochastic road surface model in time domain was built. A one-dimensional model of stochastic road was developed into a 2D model of stochastic road surface. Through computer simulation practice based on the MATlab, a 2D sample of stochastic road surface in time domain was regenerated. Furthermore, given the sample data, the PSD was estimated and then compared with the theoretical 2D PSD Equation deduced from the one-dimensional PSD expreesion so as to prove the effectiveness and accuracy of the time-domain model regeneration of 2D stochastic road surface by means of IFFT method. The 2D stochastic road surface model directly provided basic road excitation input data for virtual prototyping (VP) and virtual proving ground (VPG) technology.
摘要：
The demands of high-quality dynamic performance and short development time for vehicle production can only be fulfilled by the application of advanced design, simulation and optimization technologies. Virtual prototyping (VP), the analysis and simulation technology based on a fully developed computer model, represents a future way for cost and time efficient design of vehicles and can perform the same as those on the physical prototyping. This paper describes an integrated modeling method, based on the topological structure of a heavy vehicle and oriented to ride dynamics, of a human-vehicle-road system. A multi-body simulation model was chosen as the integration platform for the virtual prototyping since it provided the flexibility to integrate all relevant aspects such as rigid body movement, road-induced vibration and the driver's responses to the vibration. The time domain model of the stochastic excitation from the road irregularities was numerically reconstructed as input data to VP and the feeling evaluation model in time domain, equivalent to conditional frequency evaluation, was used to the vehicle's riding comfort simulation. Through integrating the sub-models in VP and combining the data of the sub-models it became possible to predict dynamic performance of vehicles by virtual prototyping technology.
