Papers by Keyword: Dynamic Modeling

Abstract: Almost all the fields use tree modeling in society, so it analyses the tree modeling in the academic circles. But it is difficult to find an efficient tree modeling method because its own complexity and wind, rain acting on tree. The object suffers rain power that the force calculated by momentum theorem. And then compare the value of rupture limit to Young modulus. It is determined object to fracture or sway. Then it constructs tree dynamic modeling in the nature.

Abstract: The submersible buoy system is an important tool in the profile observation of marine environment. According to the lumped mass based method, the dynamic modeling of the submersible buoy system is established, then the dynamic analysis is carried out. The dynamic model is solved and analyzed by using the software MATLAB. The result provides theoretical reference for its structural design and numerical computation of the submersible buoy system.

Abstract: A kind of new dynamic modeling method is presented based on improved genetic algorithm (IGA) and wavelet neural networks (WNN) and the principle of algorithm is introduced for a new type robot wrist force sensor. The dynamic model of the wrist force sensor is set up according to data of the dynamic calibration, where the structure and parameters of wavelet neural networks of the dynamic model are optimized by genetic algorithm. The results show that the proposed method can overcome the shortcomings of easy convergence to the local minimum points of BP algorithm, and the network complexity, the convergence and the generalization ability are well compromised and the training speed and precision of model are increased.

Abstract: The paper presents the dynamic modeling of a 3DOF parallel robot of 1PRRR+2PRPaR type using the Lagrange multipliers method in the rigid link assumption. Numerical simulations of the analytical dynamic model, developed using Maple software, on representative trajectories are carried out and these results are finally validated trough numerical simulations in the MBS ADAMS software. Final conclusions are drawn, useful for researchers and practitioners in the robotic field.

Abstract: In this paper, a new anti-swing control scheme is proposed for a three dimensional gantry crane. The proposed control is based on linear two optimum output regulation technology. The proposed control guarantees not only prompt suppression of load swing but also accurate control of crane position for simultaneous travel, traverse, and hoisting motions of the crane. Furthermore, the proposed control provides practical gain tuning criteria for easy application. The effectiveness of the proposed control is shown by simulation with a three-dimensional gantry crane.

Abstract: The co-simulation method of one large electro-hydraulic servo system based on software interface is proposed in this paper. The rigid-flexible-coupling dynamic model of the electro-hydraulic servo mechanism was built through data exchange of SolidWorks, ANSYS and ADAMS, the hydraulic system model and control system framework was built by EASY5 environment, the controller was built by Simulink. The integration of simulation models for the large electro-hydraulic servo system was realized by software interfaces. In view of the poor operation conditions, the high requirement of control precision and real-time characteristics, adaptive fuzzy sliding mode control strategy was applied to position tracking control of the servo system. Simulation results verified the effectiveness of this method.

Abstract: The dynamic modeling and simulation based on components for parallel type and series type absorption refrigeration using novel working pairs [mmim]DMP/CH₃OH were conducted. The modified UNIFAC model and Wilson model were used to describe the vapor liquid equilibrium and excess enthalpy of the [mmim]DMP/CH₃OH solution, respectively. Under certain assumptions, the dynamic model was developed including the HPG (high pressure generator) model, the LPG (low pressure generator)-condenser model, the absorber-evaporator model and the SHX (solution heat exchanger) model. The effect of exhaust gas inlet temperature and chilled water inlet temperature on the thermodynamic performances were presented and discussed. The best COP of 1.27 and 1.17 for parallel type and series type system, respectively, were observed. The transient responses at step changes of two variables and on experimental conditions were carried out and analyzed, and the latter had been compared with the experimental data in literature. It is indicated that the model well describes the stable and transient characteristics of the double effect absorption refrigeration using [mmim]DMP/CH₃OH, and can be employed to enable the further parameter optimization and control design.

Abstract: This paper analyzes the dynamic modeling and workplace of the 3T cable-driven parallel manipulator. The mechanism utilizes four cables to driven. Firstly, the kinematics equations and the inverse dynamics model were set up for the analysis. And then, pseudo-drag is a serious problem in cable-driven parallel manipulator, this paper give a method to find the workplace under the condition of pseudo-drag. Finally, through numerical simulation, the workplace of the mechanism satisfying the demand is presented by comprehensive analysis.

Abstract: This paper studies the dynamic modeling of weld seam by using the laser vision sensor in virtual environment (VE). By introducing virtual guide (VG), lowering operative difficulty and showing high security can be obtained. Template matching is used to recognize remote weld seam, and the uniform contour of V is defined to represent the features of remote seam. Cubic spline interpolation is employed to construct the continuous model of the seam.

Abstract: A simplified smart flexible spatial piezoelectric beam with overall motions is studied in this paper. Considering the geometrically nonlinear effect resulting from curved and twisted deformations, and considering the kinetic energy of the piezoelectric actuator and the coupled terms of deformations in the longitudinal, lateral and transversal directions, and taking into account the coupling of electric performance of piezoelectric material and structure deformation, finally, the Rigid-flexible-electric coupling dynamic model of piezoelectric smart beam is established by infinite element method and Lagrange equation.