This paper presents a new correlated methodology for engineers to develop a specific vehicle-Unimog associated with a unique structure of movement transmission. A complicated multi-body dynamic model which includes the front/rear axle suspension with thrust tube and coil springs, the steering system, tire and road exciting model is established based on the virtual reality (VR) technology. The topology and kinematics relation of the whole system are analyzed firstly, then the proper constrain pairs are applied among them to satisfy the amazing flexibility and ride comfort of the real vehicle. To more accurately model the real system, some key parameters are acquired by the way of experiment and prediction, respectively. And a triangle function method which combined the inverse Fourier and discrete random producer is proposed based on the standard PSD (power spectrum density). Finally, the ride performance has been evaluated on the random road by simulation and field test. The results show that the applied constraint of the model is correct and the kinematics relation matches the actual condition well. The consistency trends both in time and frequency domain for virtual and field test result show that the established model is effective.

The vertical vibration of the in-wheel motor electric vehicle (IWM-EV) induced by large unsprung mass is analyzed based on power flow method. The simulation results show that due to the unsprung mass increase of IWM-EV, energy consumption of the suspension and wheel is increasing, which will cause adverse effects on not just the ride comfort but the maneuver stability. To decrease the effect, a new kind of vibration mitigation measure of the vehicle body absorber combined with an active hybrid control integrated the sky-hook and ground-hook methods is developed. The effectiveness of this measure is verified.

The Cropping System Model (CMS) simulates growth, development and yield of a crop growing on a uniform area of land under prescribed or simulated management as well as the changes in soil water, carbon, and nitrogen that take place under the cropping system over time. Decision Support System for Agro-technology Transfer DSSAT is one of many cropping system models and has been relatively widely applied. In this paper, the development history, the system structure, and the application field of the model system are summarized, and the principle and mechanism of the model to simulate the soil-water balance in the study of water resources management and the representative study results obtained by the scholars in China are analyzed in detail, so as to provide references for relevant studies and applications.

To simplify the model of rotating cylindrical shell, the static forces are neglected and the vibration equations are established. Transfer matrix method is used to solve the equations and the example shows that the simplified model has little effect on the result. So the simplified model can be used in complex structures such as multilayer and multidiameter shell.

Abstract. Active vibration control use an active force from secondary path to suppress or attenuate periodic or quasi-periodic vibration and noises, one of the popular control algorithms is filtered-x least mean square (FxLMS) adaptive method. Based on structure of FxLMS algorithm, the paper uses Level-2 S-fun to create a new FxLMS blocks in Matlab/Simulink and apply it on vibration active control system simulator. Results of computer simulation showed the custom FxLMS block's feasibility and control algorithm's efficiency. On the condition of stabilization, behavior analysis was also taken out by adjusting the interior parameters, including the number of Weights and theStep size. IntroductionRotating machines such as gear boxes, motors, cutting machines, aircrews etc, generate noise and vibration signals that can usually be modeled as sinusoidal signals in additive white noises. Suppressing or reducing these noise signals, especially their lower frequency portion, is of great importance in various engineering and environmental systems [1]-[3] , Recently active vibration control (AVC) systems have been developed to suppress these annoying vibration sources [4] . A large number of AVC systems have been proposed in the literature, and some of them have been implemented in real-life applications [5] . Usually, FIR filters are applied, which are adapted by the filtered-X least-mean square (FxLMS) algorithm or its variants. Other techniques using recursive least squares (RLS) and Kalman filter based algorithms have also been developed for many ANC systems. Normally, a well-designed controller will be able to provide sufficient reduction to achieve the desired response under certain conditions. This paper aims the implementation of FxLMS Algorithm based on level-2 s-function and behavior analysis. Because the Level-2 S-function provides access to a more extensive set of the S-function API and supports code generation that facilitates the next experiments and practical engineering applications.