Advanced Materials Research Vols. 479-481

Abstract: An SIRS epidemic model with nonlinear incidence rate is studied. It is assumed that susceptible and infectious individuals have constant immigration rates. By means of Dulac function and Poincare-Bendixson Theorem, we proved the global asymptotical stable results of the disease-free equilibrium. It is then obtained the model undergoes Hopf bifurcation and existence of one limit cycle. Some numerical simulations are given to illustrate the analytical results.

Abstract: Path planning is the kernel problem of the robot technology area. In this paper, the grid method is used to make environmental modeling, Since the Genetic Algorithm (GA) has its immanent limitations and the Simulated Annealing (SA) Algorithm has the advantages in some aspects, combined these two algorithms together just achieve the perfection. In view of this, a hybrid of GA and SA (GA-SA Hybrid) is proposed in this paper to solve path planning problem for mobile robot. The algorithm making the crossover and mutation probability adjusted adaptively and nonlinearly with the completion time, can avoid such disadvantages as premature convergence. The new algorithm has better capability of searching globally and locally. The simulation results demonstrate that the proposed algorithm is valid and effective.

Abstract: When working, tower crane is affected by natural environment and is subjected to complex various loads. So it is not very easy to analyze its dynamic performance at system level. Some researchers have done some work as to simulation and analysis of tower crane, in order to study its dynamic performance. While much of their work based on grid body model but not flexible body model. This paper used SolidWorks and ADAMS to build the virtual prototype of a tower crane based on ADAMS flexible body. After the co-simulation, which joined ADAMS with SolidWorks, force of the connection between tower crane base and the strengthened section of the crane was recorded and analyzed. And so was the acceleration of the tower crane’s lifting rig. Succeeding in the application of Virtual Prototyping Technology based on ADAMS flexible body, this study can be used to direct the work, operation and fault diagnosis of tower crane, and lay a basis for further studies.

Abstract: 2MK-1760 is a grinding machine used in large scale optical lens manufacturing. To meet the manufacturing requirements, the block thin film hydrostatic guide rail is applied. In this paper, the structure of block thin film hydrostatic guide rail is proposed. In order to get the thickness and the stiffness, design calculation is performed. Experiments are carried out to verify that the feasibility and the validity of this technique.

Abstract: A Macpherson suspension model of a car was built based on ADAMS/ CAR. The kinematics discipline of the suspension was shown based on the general theory. Through the comparison of the simulation results of the two kinds of suspension, the L type Macpherson suspension in the wheel alignment parameter, steer angle and anti-lift/dive performance aspects is improved.

Abstract: According to the reverse design for the motion law of the follower in the swing upward conjugated cam paper-feeding mechanism, the technological requirements of positive design for paper-feeding mechanism are obtained. The quintic polynomial is presented to simulate the motion law of the paper-feeding tooth, and the mathematic model of the profile for conjugated cam is established. The profile of conjugated cam based on an actual sample is calculated, and the feasibility of this method is validated. It has some reference to design similar products.

Abstract: In order to obtain accurate results from computer simulation of the dynamic behavior of conveyor belts an accuracy description of the resistance forces, especially the indentation rolling resistance, is necessary. Since the indentation rolling resistance can account for the major part of the total rolling resistance, it is important to calculate it using a proper method. A new full two-dimensional semi-analytical method based on Maxwell model is developed to rigorously and efficiently simulate and solve the indentation rolling resistance of conveyor belts. In this method, the solution is expanded into a set of Fourier series, a so-called Maxwell model characterizing the viscoelastic properties for the belt cover material is used to relate Fourier coefficients, and a special boundary element is developed to handle the rolling contact boundary condition. A verification example is given to validate the methodology.

Abstract: For being convenient for researching the dynamic characteristic and the improvement and use of RRR-PRP planar six bar mechanism, for improving the dynamic technical performance, the three-dimensional solid model of the mechanism was established with ADAMS. Each part of the model in ADAMS was set up. Simulation analysis on the working process of the mechanism was achieved. The structure optimization parameters of the mechanism were obtained. The result proves that the vertical locations of two end points of rocker are almost no impact on the vertical velocity of slider. The location of block and the horizontal locations of two end points of crank and rocker have less impact on the vertical velocity and acceleration of slider. The vertical locations of two end points of crank have greater impact on the maximum vertical velocity and acceleration of slider.

Abstract: The effect of contact between cradle arc and main gear of elevating mechanism on muzzle disturbance is studied.The precise 3D models of involute straight tooth gear and arc are constructed by PRO/E software.Considering the contact between cradle arc and main gear of elevating mechanism,the nonlinear finite element model for naval gun is established.The results of numerical simulation show that the contact/impact has great effect on muzzle disturbance.

Abstract: The vehicle flexible coefficient and the center of carbody sway movement are deduced. Based on the deduced equations, the influence of some critical parameters is studied for Motor Cars. In order to get the influence of the primary suspension on the dynamic performance, a vehicle model considered as a multiple rigid body system composed of wheelsets , bogie frames, carbody, primary and secondary suspensions is set up. Dynamic simulation results show that the primary suspension has a large influence on the vehicle.