Advanced Materials Research Vols. 945-949

Abstract: Walking beam transport is short for walking beam, mainly is responsible for transporting steel coil,and is an important process equipment and transportation device.The working referring to two parts is mainly studied in this paper.Firstly SolidWorks software was used to analyze the movement and force for the building model; In the second ANSYS software was used to do the structure stress analysis for the main parts of the walking beam.Through the analysis, it could be drawn the stress and deformation relevant data of the walking beam.It found the maximum principal stress is in line with the material allowable stress on the moving beam section.The results proved the moving beam system in the walking beam could satisfy the requirements of production, providing a theoretical basis for the structural analysis of practical production.

Abstract: To obtain the concise relationship between the dynamic load and its influence factors, the single degree-of-freedom system was applied to simplify the crane working mechanism. Based on the sloping load, this paper analysed the main influence factors on the dynamic load and two relations were obtained:the relation between the dynamic load coefficient and the loading time;the other between the dynamic load coefficient and the natural vibration period. Due to the previous calculation and analysis, the suitable loading time and the dynamic load coefficient within the engineering permissible range were also obtained. The stiffness formula based on the loading time of the system’s elastic component was originally put forward. The result provided not only reliable basis to obtain the geometric parameter of the elastic component, but also feasible measures to prevent the dynamic load from increasing. Hence, it is effective to ensure the stable running of the equipment.

Abstract: Excavating trajectory impact the production efficiency and overall performance of excavator directly [1]. Hence, it’s of very realistic significance to obtain the optimal excavating trajectory. Based on site test data, the point of tangency of the rack pitch line of the bucket rod and the pitch circle of the crowd gear were determined as the rotating center and the dynamic model of working mechanism was derived; due to the change law of the current and voltage of the hoist motor, the excavating process sections was separated from the excavating trajectory; log spiral model was chosen as the fitting function, and according to the following three judgment rules: maximizing soil volume in bucket, rationalizing the excavating time and minimizing the energy consumption of unit mass of soil in bucket, the optimal excavating trajectory was obtained and provided basis for the operation and design of the large mining excavator [2].

Abstract: This work is concerned with the modelling of the interaction of fluid flow with flexible solid structures. The fluid flow considered is governed by the incompressible Navier-Stokes equations and modelled with stabilised low order velocity-pressure finite elements. The governing equation of fluid movement is described by an arbitrary Lagrangian-Eulerian (ALE) strategy. The structure is represented by means of an appropriate standard finite element formulation. A simple data transfer strategy based on a finite element type interpolation of the interface degrees of freedom guarantees kinematic consistency and equilibrium of the stresses along the interface. The resulting strongly coupled set of non-linear equations is solved by means of a partitioned solution procedure, which is based on the Newton-Raphson methodology and incorporates the full linearization of the overall incremental problem.

Abstract: Aiming at flexible folding boom of the lorry cranesuppress the beam vibration while track a desired trajectory, the paperdesigns a composite control method based on the singular perturbation theory. The flexible multi-body dynamics equation of the flexible folding arm was established by the Lagrange equations and assumed mode method. The system was decomposed intorigid motion (slowly varying system) and flexible vibration (fastvariable system). Fuzzy PID control was designed to track the flexible arm’s rigid motion trajectory control and the linear quadratic optimal controlwas designed to suppress the elastic vibration. The simulation in Simulink results show that the composite control method can control the folding arm effectively.

Abstract: The object is dismantling machine shear head with 500kN’s maximum shear force. The three-dimensional models, static analysis, topology optimization were done in the ANSYS Workbench. And the goal driven optimization was done which based on topology optimization. The maximum total deformation, maximum equivalent stress and geometry mass were selected as objective parameters and the distance of two connecting holes, diameter of long hole and length of blade as design variables. At last, the optimized structure was checked. The strength and rigidity meet the requirements and the mass decreased.

Abstract: Motion trajectory is the fundamental basis for the design and research of parachute. The fall state, the minimum safe altitude and airborne site are closely associated with the motion trajectory. Particularly due to rapid changes in these parameters such as canopy shape, velocity, dynamic load of the parachute, it is very difficult to determine the motion trajectory of parachute inflation process. Currently, the trajectory is mainly obtained by airdrop tests or wind tunnel tests. The tests are very expensive. Based on the force analysis and mathematical model of a certain type of parachute, we used the computer system to study the motion trajectory of parachute.

Abstract: A mathematical model of air vehicle gliding trajectory was established and attack angle was regarded as control variable. Adaptive simulated annealing algorithm was adopted to optimize the 101 nodes of attack angle. By optimizing the control law of attack angle of gliding trajectory, the maximum range of air vehicle is increased significantly, which increases 107%.

Abstract: Belt conveyor has the strong adapt ability and it uses widely in convey machinery. Roller is one of the key components in the belt conveyor; it plays an important role in the normal operation of belt conveyor. In order to study the influence factors of roller service life, this paper analyzed the movement of the roller and used Solid edge ST4 and ADAMS software to establish the virtual prototype model of roller and kinematics simulation of the model. This paper concludes the main factors affect the life are the sealing effect, poor alignment of the roller and the alignment of the bearing. Through the analysis of roller can reduce the design errors, improve the processing and installation accuracy mostly at the same time in the production process, it also can reduce the design and process time significantly and lower manufacturing cost and prolong the service life of roller.

Abstract: Micro-structure injection molding machine is mainly used for processing the plastic products in micron-size or with micro-structures. This paper focuses on the design and control of the clamping mechanism of micro-structure injection molding machine. Firstly, the deformation of the clamping mechanism was analyzed. The simulation results shows that the clamping force is 5.0051×10⁵N, and it’s bigger than the design value 500kN. Secondly, the kinetic characteristic of the clamping was simulated by ADAMS software. The curves of the displacement, velocity, clamping force of moving platen were analyzed. Thirdly, the control model of clamping mechanism was established. And the LQR controller was designed and simulated by Matlab. The rise time is 0.010s, the settling time is 0.026s and the steady-state is 0.307m.