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This paper presents modelling of ball and plate systems based on first principles by considering balance of forces and torques. A non-linear model is derived considering the dynamics of motors, gears, ball and plate. The non-linear model is linearized near the operating region to obtain a standard state space model. This linear model is used for discrete optimal control of the ball and plate system...
Shift quality is the key of automatic transmission research on mining vehicles due to the frequent gear-shifting. A comprehensive dynamic model is built to analyze shifting process of the transmission system. To calibrate and adjust the hydraulic pressure curves of clutches in the model, the experimental data acquired by road test are used in the strategy as the calibrating reference data. Then the...
Based on city driving cycles, this study analyzes the load distribution of the wheels-side electric drive (WSED) system for vehicles. The input load and speed are defined based on the output torque of motor, and its load characteristics are analyzed by employing gear counting method. The load distribution is determined by stratified sampling method, which follows a mixed Gaussian distribution. Moreover,...
Electric steering gear is the executive body of aircraft maneuvers and an important part of aircraft guidance system. Based on a simplified model of electric steering gear for study, the first study includes the function and structure principle, the main performance parameters and failure thresholds, storage conditions and failure analysis of the electric steering gear. Secondly, the sensitivity of...
An analysis and modeling approach of an electromechanical harvesting system based on a brushless generator (BLG) is presented and evaluated. The approach is based on an electrical analog of the mechanical components and was verified by modeling a knee joint harvesting system. Good agreement was found between the model predictions and the experimental results. New harvesting strategies based on energy...
Bucket wheel excavators, spreaders, mobile crushers, movable belt conveyors and other machines on open pit mines are huge tracked vehicles with slow speed of movement. To be able to move on mine's terrain, the machines are equipped with crawler mechanism for support and transport. Crawler chain serves for transformation of rotation of drive tumbler to linear movement of tracked vehicle. This transmission...
This paper presents a power drive circuit for electric vehicles with a buck-boost power converter. The buck-boost converter with a dedicated current control allows achieving an electronic gear for DC motors. With this topology is possible to allow a torque-speed profile that resembles the obtained by a geared manual one but in a continuous manner, meaning that the power value is limited at high speeds...
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