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Clutch shift control is critical for the performance and fuel economy of automotive transmission, including both automatic and hybrid transmissions. Among all the factors that influence clutch shift control, clutch fill and clutch engagement are crucial to realize a fast and smooth clutch shift. When the clutch is not engaged, the fluid held by the centrifugal force inside of the clutch chamber, which...
Magnetic levitation is still an important issue for industry and research. Wherever high dynamics, position accuracy, high reliability and low mechanical wear are required, magnetic levitation is an effective alternative to conventional technologies. Conventional systems with mechanical guiding have shown to be limited in speed. For transporting goods over long distances, levitation can thus lead...
This paper proposes a spherical underwater vehicle which is propelled by water-jetted motors. It has many characteristics such as small size, light weight, flexibility of motion and noiselessness. In this paper, the dynamics model of the vehicle is analysed according to its design; and the vehicle's dynamics model is developed. The dynamics model of propellers for the vehicle is also analysed for...
The paper firstly calculates the optimal location of external torpedoes. And then the dynamics model of the UUV hanging torpedoes externally is established. Also, the force and moment the torpedoes exerted on the unmanned underwater vehicle are analyzed. Based on the model, the corresponding maneuverability simulation program is derived using SIMULINK. The results show the variation of the maneuverability...
While establishing the ship's single-degree-of-freedom nonlinear rolling equation, damping moment and restoring moment were approximated to cube and seven times separately for convenience. On the basis of this, catastrophe theory was applied to analyze the ship capsize problem caused by single-degree-of-freedom nonlinear rolling in regular waves. Through mathematical manipulation, the ship's nonlinear...
This article briefly explains the lateral vehicle dynamics and upgrades a two wheel vehicle model adding the dynamics of roll, tire relaxation and wheels induced angles. The state equations of the resulting model are given. A bond graph model is build step by step from the resulting equations in order to have a base model to facilitate analysis, simulation and further developments.
In this paper, a six degree-of-freedom dynamic model of guided munitions is derived. On the assumption that itpsilas a rigid body, the effects of wind are taken into consideration, both constant wind velocity and wind acceleration respectively. Compared with traditional models of guided munitions, the time change rates of angle of attack and angle of sideslip are explicitly expressed in this model...
When constructing differential equations for the tracked vehicles on the nonholonomic constraint condition, the complex calculation problems tend to be caused. For such problems, this paper proposes a modeling method that simplifies the tracked vehicle as single and multi-body model based on the holonomic constraint condition on the given slope path. System rolling resistance and the dissipated force...
In this paper the path planning for obstacle-avoided pursuit problem (OAP) is studied. The OAP models based on the mixed integer linear programming (MILP) is presented. In the OAP models, the dynamic equation of mass point with linear damping is taken as the state equation of vehiclepsilas motion. Integer variables are used to describe the relative position of vehicle and obstacles. ldquoExpansible...
In contrast with man-operating underwater vehicles, autonomous underwater vehicles (AUVs) should find a proper trajectory, control to follow the trajectory, avoid static or moving obstacles, and home safely to their mother ship or launching device by themselves. As a consequence, lots of newly introduced problems have to be solved compared to man-operating underwater vehicle case. In these works we...
Multibody Dynamics Programs that automatically generate the equations of motion enable designers to study the large displacement two/three-dimensional motion of constrained mechanical systems. Most existing multibody programs have been developed to deal with problems in machine and robotic dynamics. While these programs can be applied to vehicle dynamics their use of cartesian coordinates and Lagrangian...
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