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The article presents the system of ergonomic angular distribution of torque on the pedals in the pedaling-by-wire driven electric vehicle. The work is an attempt to make cycling feelings close to the natural in the presented prototype — as in the typical bicycle. Ergonomic distribution of torque results also in speed fluctuations reducing. The model of pedaling process is shown with introduction of...
The article deals with the impact load decrease methods by the example of a rolling stand electric drive of a hot plate mill 5000 OJSC “Magnitogorsk Iron & Steel Works”. The mathematical description of a synchronous motor, which is used to rolling stand, has been provided. A simulation model was developed based on the mathematical description of the synchronous motor. This model is carried out...
In this paper the nonlinear dynamics of a hydraulic system consisting of centrifugal pump, pressure accumulator and connected load are modeled and a Feedback Linearization controller is designed. Furthermore an Extended Kalman Filter is implemented to include the hydraulic dynamics into the estimation and simultaneously overcome the necessity of flow and pressure measurements. Therefore, the combined...
The backlash is one of the most important nonlinearities that affect the performances of the mechanical manipulators control. When backlash occurs in a system, the stability and the performance can change which produces an inaccuracy or an uncontrollability of the mechanism. In this study, a feedforward control is developed in order to anticipate the disturbing torque transmitted inside the dead zone...
In this paper, we propose an off-line tuning method of the vibration suppression controller gains for 2-inertia system using Fictitious Reference Iterative Tuning (FRIT). FRIT is one of data-driven design methods using only one-shot experimental input-output data without model parameters of the controlled object. We use the modified-IPD speed controller which consists of the 2-degree of freedom PID...
In the paper a gain-scheduled Linear-Quadratic (LQR) control system for the model of Hybrid Excitation Synchronous Machine (HESM) is presented. A special design feature of the hybrid excitation synchronous machines is an additional control loop which allows to control the resultant magnetic flux. From the control synthesis perspective hybrid excitation synchronous machines can be described as Multi-Input...
To improve low-speed stability and dynamic response of traditional variable speed pump control systems, this study proposes a variable speed pump control system in valve-pump parallel variable structure control, where a proportional flow valve is parallel to a variable speed pump and could work at leaking status and replenishing status, and then establishes its mathematical model and then analyses...
The generic polynomial controller for linear, time invariant (LTI) plants is applied to a DC electric drive with significant flexibility of the coupling between the motor and the mechanical load for its speed control. In contrast with a traditional PI controller, the polynomial controller permits independent placement of the closed loop poles to achieve the desired closed loop dynamics. An original...
In the paper an application of IMC structure for electric drive with variable mechanical parameters is presented. The mechanical parameters changing as a function of motor shaft angle. The control system was used a neural inverse model trained on line by the modified algorithm RPROP. The collected results of simulation and experiment confirm the proper operation of the control system.
For a laboratory evaluation of the effects of PQ phenomena on three-phase induction motors (TIM), one of the challenges is to set up equipment that allows adjusting the machine's nominal current and selecting the type of load to be driven. Direct Current Generators (DCG) can be used to emulate different kinds of mechanical loads on the motor shaft. To do this, it is necessary to adopt a control strategy...
Conventional PI regular is a simple control method that is widely applied in permanent magnet synchronous motor (PMSM) control systems. However, in most cases, it cannot meet the requirements of high performance control. In order to improve system robustness and response, this paper adopts sliding mode variable structure control strategy in the design of a double-loop controller (speed loop and current...
The secondary regulation technology is a new energy saving hydraulic transmission technology, which can make several loads work parallel in a constant network system and very suitable for the drive axle test system. Secondary regulation load test of drive axle is a three axis loading system. The basic theory of the test system is analyzed, and the mathematic model of the secondary regulation is found...
A self-tuning two degree of freedom (2-DOF )PID controller based on fuzzy inference is presented. In view of the deficiency of conventional 2-DOF PID controller in the parameter time varying system, integrate the two-degree-of-freedom PID control with fuzzy techniques, a self-tuning PID controller based on fuzzy inference is designed. On-line automatically tuned parameters are realized at different...
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