Papers by Keyword: Dynamic Analysis

Abstract: Focusing on the On-Orbit Servicing technology, a novel automatic autonomous probe-cone docking mechanism used for microsatellite docking is proposed. The structure of this mini docking mechanism is provided, and a virtual prototype model of the mini-type universal docking system is established by using MATLAB software. The simplified dynamic analysis model during the capture process is established. The dynamic characteristic analysis of the capturing process is completed to research the influence of the key parameter, and the simulation results meet the designs demand of mini-type universal autonomous docking mechanism.

Abstract: This article illustrates the dynamic behaviour of the suspension of the bogie of the UAQ4 experimental superconducting levitating train. The levitation system uses high temperature (liquid nitrogen cooled) superconductor bulk materials on board and permanent magnets distributed on the guideway. The magnetic interaction between the two, and the Meissner effect, both lift and guide the vehicle. A model with one degree of freedom of the bogie is developed and parametric dynamic analyses are performed and discussed by varying the most significant system parameters.

Abstract: The paper design a double eccentric mass driven spherical robot, the ball is also subject to eccentric force and inertia force that generate by internal drive units in movement. Due to the unique spherical shell, the robot in the dynamic state transition process, Friction cannot offset the robot motion state change due to internal driving motion error of small units. In order to make linear movement of the spherical robot that can smooth start, stop and speed control, the paper design a method for linear motion driven spherical robot with double eccentric mass control. The improved driving eccentric mass of robot total mass ratio is larger, that can provide the eccentric torque and inertia moment more, the robot has higher motion velocity.

Abstract: This thesis mainly analysed the internal relations between parameters of SiC MOSFET and its dynamic and static characteristics respectively. And furthermore, a new method for modeling of SiC MOSFET based on PSpice was proposed in this paper. By introducing voltage’s controlling for voltage source E, we can compensate and correct the difference between PSpice default value of gate threshold voltage and actual value. At the same time, we can adopt two different junction capacitance models to describe the changes of junction capacitance which were brought about by the difference of the terminal voltage. In the meanwhile, there are newly increased source-drain resistance of MOSFET and gate resistance with the temperature change of variable temperature sub models. New models are able to fully and accurately reflect SiC MOSFET’s static and dynamic characteristics. Moreover, it provides an important foundation for switch process analysis of SC MOSFET, loss calculation and main circuit design. The fact that the experimental testing result is highly coincident with the simulation results verifies the correctness and accuracy of the models.

Abstract: This paper is a further analysis of the strain tower on 1YD - JC4.After making a static analysis of 1YD - JC4 strain tower,we select the best offset point and make a dynamic analysis of it.Based on the finite element analysis software SAP2000, we set up a three-dimensional model of 1YD - JC4 strain tower of 110kv about heavy icing area,and then obtain the first six modal frequencies after making a dynamic analysis . We then draw the response spectrum curve.in the end, we select the safe and economic value of damping according to the curve.

Abstract: This paper describes a new genre of Toroidal-CVT system, called the Sphere-Toroidal Continuously Variable Transmission (STCVT), which is derived from the half-toroidal traction drive (TCVT) and introduces its structure and working principle. The torque transfers from the input shaft to the cross-axle universal shaft coupling connected with the driven shaft. By discussing the difference between the torque-transfer, the paper will show the possibility of the application in the vehicle. To conclude, the system has the potential to implement infinite extension for the CVT theoretically.

Abstract: Selection of drive components and determination of dynamics properties are extremely important technical components for overall design of palletizing robot. As an example, the paper firstly introduce how to establish mathematical model and finish kinematics analysis. Based on the previous work, MATLAB scripts are written through the use of Newton-Euler Method to analyze and calculate dynamic analysis, after which the parameters of dynamics are obtained. Then the dynamic behavior is studied by multi-body system simulation using ADAMS software to testify the former analysis in MATLAB. Lastly, two speed trajectory algorithm were adopted to simulate for the same working condition, in an attempt to investigate the difference in their dynamic behavior and provide a reliable theoretical basis for optimal control method.

Abstract: This paper establish the index system of metro project which included four control targets of the engineering project management that is quality, cost, construction period, safety into integrated dynamic system. We realizes the PCA dimension of the 17indexes in the set and gets four principal components by using PCA of multivariate statistical methods. According to the feature vector of four main components, the main ingredients are classified and reorganized. By comparing the scores ranking of four redefined main components and evaluation scores ranking, we conduct integrated dynamic analysis of metro project objectives. Finally, the results of case study shows the conclusion is in line with the possible situations of the metro project management.

Abstract: The mixed time integration parallel algorithm for nonlinear dynamic analysis was presented by synthesising the implicit and explicit time integration techniques. The parallel algorithm employing mixed time integration technique was devised with domain decomposition. Concurrency was introduced into this algorithm by integrating interface nodes with explicit time integration technique and solving local subdomains with implicit algorithm. Numerical example was implemented to validate the performance of the parallel algorithm. Numerical studies indicate that the proposed algorithm is superior in performance to the implicit algorithm.

Abstract: Submarine pipelines are described as the lifeblood of offshore oil and it is crucial to ensure the seismic safety of the submarine pipelines. Based on the fluid-structure interaction numerical analysis method and by using finite element software ADINA, the analysis models of the free long-span submarine flexible pipelines under earthquakes were established. By employing dynamic time-history method, the influences of fluid-structure interaction on the seismic response of the submarine pipelines were researched. The results showed that the peak normal stress and the peak displacement of submarine pipelines’ mid-span considering the influences of the fluid-structure interaction are greater than those without considering the influences, and the influences of the fluid-structure interaction on the seismic response of the submarine pipelines will increase with the increase of the submarine pipelines‘ diameter.