Abstract: Vertical vibratory conveyor has some advantages like simple configuration, less occupied, long conveying distance, less energy consumed. The configuration and force analysis of vertical vibratory conveyor are conducted. The model of system with considering the friction between the materials and the spiral conveying trough is developed. The numerical simulations are done and the dynamical responses curves are given. Suitable configuration parameters of vertical vibratory conveyor and parameters of materials can make it work normally.
Abstract: The power bond graph of hydraulic array nail machine was built on the basis of analyses on its hydraulic system and actual working cases. Dynamic model of array nail machine hydraulic system was built. At the same time, making use of Simulink, dynamic simulation of hydraulic system of array nail machine was carried out. Influence law of primary technology parameters on dynamic characteristics of the hydraulic system was expounded. The simulation results will provide theory bases for performance analysis and optimal design of array nail machine hydraulic system.
Abstract: Competitive advantage is influenced by dual mechanical system: endogenous system and exogenous competitive system. Compared with uncontrollable exogenous competitive elements, endogenous competitive elements exerting structural competitive advantage is of vital importance for companies to battle against disadvantages and achieve competitive advantaged independently. Endogenous competitive elements comprise: firm culture, dynamic capabilities, and complementary assets. At the strategic level, firm culture influences firm decisions; at the organizational level, dynamic capabilities create core competence of a corporation; at the practice level, complementary assets erect barriers to competitors. This study empirically analyzed Firm Sayyas, a leading firm in wooden windows industry having encountered countless structural changes of competitive elements, to uncover how SMEs can achieve competitive advantage. The empirical analysis shows that, cultivating endogenous competitive elements based on “firm culture, dynamic capabilities, and complementary assets” in the dynamic competition is an effective way to maintain SMEs’ competitive advantages.
Abstract: In order to increase the reliability and efficiency of the dynamic analysis of complex robot systems, the corresponding vector bond graph procedure is proposed. Based on the kinematic constraint condition, the vector bond graph procedure for modeling robot systems with cylindrical joint is described. For the difficulties brought by differential causality in the system automatic modeling and simulation, the effective decoupling method is proposed. As a result, the unified modeling and simulation for robot systems are realized, its validity is illustrated by the spatial robot system with five degrees of freedom.
Abstract: This paper describes the basic structure of the continuously variable focus lens form. The movement in the form of the lens is simulated analysis through ADAMS software. Trajectory accurately restore the zoom group and compensation group. With the theoretical design of comparative analysis and validation process the lens structure design movement, save the latethe experiments verify the cost of the great significance of the production process.
Abstract: It is very important to do hydrodynamic analysis for TLP in its basic design process. This thesis studied the hydrodynamic behavior of a traditional TLP. DNV/SESAM software was used to do the modeling and calculating work. Totally three models were built, including panel model, mass model and structure model. Response Amplitude Operator (RAO) was calculated, and the combinations of wave directions and wave periods, which would affect the platform to the most degree, were obtained by analysis. Short-term statistics were analyzed with coupled analysis method to give out the extreme values of motions in a short period. And thus the platform motion and load conditions in this period could be predicted. The results show that this TLP has a reasonable global performance and meets the requirement of production.
Abstract: Planner six-bar mechanism is widely used in the textile industry. In this article, feed mechanism of sewing machine is studied. The kinematics and dynamics simulation model is established for this kind of mechanism. On the basis of it, a relevant simulation is carried out through SimMechanics. Thus, the motion rules and stress state for all parts of mechanism are described vividly. The simulation results show that this method is effective and efficient when the simulation is implemented for a certain machine system. Meanwhile, it provides a foundation for the further research of the mechanism in the future.
Abstract: On the basis of the structure characteristics of the seperated manually adjustable damper and its working principles, establish the shock absorber mathematical model, at the same time, get test data and curves of seperated manually adjustable shock absorber damping characteristics by bench test. Use MATLAB to simulate the characteristic curve of the speed of the shock absorber based on the mathematical model. The simulation curves and experimental curves were compared to verify the correctness and accuracy of the model. Further simulation and analysis affect of parts of structural changes on the damping characteristics. In order to provide a theoretical basis to structural parameters designing and vehicle damping matching.
Abstract: Using CFD software, the mean wake fraction and thrust deduction fraction are obtained by simulating the flow field around submarine with equally distributed body force adopted to simulate the affection of propeller. The open water performance of propeller 4118 was applied to calculate the rates of propeller rotation required by the submarine at different speeds and corresponding propulsive efficiencies. The comparison between these data and the calculated results of self-propulsion test indicates that a more accurate prediction of the submarine powering performance can be made with the mean wake fraction obtained near the leading edge of the propeller, and the computational error of propulsive efficiency can be reduced to 2%. Research of this paper shows that submarine powering performance can be calculated effectively with the propeller replaced by body force.