A New Control Method for Triple-Active Bridge Converter with Feed Forward Control

2018 ◽  
Author(s):  
Takanobu OHNO ◽  
Nobukazu HOSHI
Keyword(s):  
Control Method ◽  
Feed Forward ◽  
Feed Forward Control

scholarly journals Feed-forward control of elastic-joint industrial robot based on hybrid inverse dynamic model

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110381
Author(s):  
Mei Zaiwu ◽  
Chen Liping ◽  
Ding Jianwan
Keyword(s):  
Dynamic Model ◽  
Analytical Model ◽  
Control Method ◽  
Data Driven ◽  
Parameter Uncertainties ◽  
Inverse Dynamic ◽  
Inverse Dynamic Model ◽  
Feed Forward ◽  
Elastic Joint ◽  
Feed Forward Control

A novel feedforward control method of elastic-joint robot based on hybrid inverse dynamic model is proposed in this paper. The hybrid inverse dynamic model consists of analytical model and data-driven model. Firstly, the inverse dynamic analytical model of elastic-joint robot is established based on Lie group and Lie algebra, which improves the efficiency of modeling and calculation. Then, by coupling the data-driven model with the analytical model, a feed-forward control method based on hybrid inverse dynamics model is proposed. This method can overcome the influence of the inaccuracy of the analytical inverse dynamic model on the control performance, and effectively improve the control accuracy of the robot. The data-driven model is used to compensate for the parameter uncertainties and non-parameter uncertainties of the analytical dynamic model. Finally, the proposed control method is proved to be stable and the multi-domain integrated system model of industrial robot is developed to verify the performance of the control scheme by simulation. The simulation results show that the proposed control method has higher control accuracy than the traditional torque feed-forward control method.

Research on Flatness Feed-Forward Control for Cold Rolled Strip

2012 ◽  
Vol 572 ◽  
pp. 165-170
Author(s):  
Ru Ying He ◽  
Ting Quan Gu ◽  
Yun Feng Liu
Keyword(s):  
Control Method ◽  
Rolling Force ◽  
Rolling Process ◽  
Thin Strip ◽  
Rolled Strip ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Strip Flatness ◽  
Cold Rolled ◽  
The Stability

A feed-forward control method for cold rolled strip flatness is put forward. That is to carry out feed-forward compensation to bending force of the stand, so as to mitigate the complex influence caused by changes of rolling force and tension in rolling process on strip flatness based on regular flatness feedback control which focus on the last stand, according to changes in stand rolling force, inlet tension and outlet tension measured. Result shows that this technique not only increased the flatness quality of the strip cold-rolled, but also increased the stability of cold-rolling process of thin strip when it was actually applied in a cold tandem mill.

Research on Synchronous Control for Dual-Cylinder System with Unbalanced Loading

2011 ◽  
Vol 143-144 ◽  
pp. 53-57 ◽  
Author(s):  
Zheng Yu Mao ◽  
Jun Yuan ◽  
Zhong Jian Liu
Keyword(s):  
Control Method ◽  
Hybrid Control ◽  
Total System ◽  
Piston Motion ◽  
Feed Forward ◽  
Synchronous Control ◽  
Feed Forward Control ◽  
Load Imbalance ◽  
Synchronous Error ◽  
Feed Forward Controller

To aimed at the synchronous control for dual-cylinder with unbalanced and uncertainty loading, this paper proposes a hybrid control method that consists of feed-forward control and fuzzy feedback control. In the first, a feed-forward controller of each cylinder based on trajectory restrains is developed to limit the motion and synchronous error to a certain extent, and also smooth the piston motion. Then, two fuzzy controllers are specified to improve the tracking performance of cylinder and compensate the synchronous error. The simulation experimental results show that the proposed hybrid control strategy can control the maximum synchronous error of the total system to be within ±10mm under the consideration of large load imbalance, and has the system motion of a good smoothness.

scholarly journals Input Shaping for Feed-Forward Control of Cable-Driven Parallel Robots

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Sana Baklouti ◽  
Eric Courteille ◽  
Philippe Lemoine ◽  
Stéphane Caro
Keyword(s):  
Closed Loop ◽  
Control Method ◽  
Parallel Robots ◽  
Input Shaping ◽  
Residual Vibration ◽  
Feed Forward ◽  
Loop Control ◽  
Feed Forward Control ◽  
Velocity Error ◽  
Moving Platform

Abstract This paper deals with the use of input-shaping filters in conjunction with a feed-forward control of cable-driven parallel robots (CDPRs), while integrating cable tension calculation to satisfy positive cable tensions along the prescribed trajectory of the moving platform. This method aims to attenuate the oscillatory motions of the moving platform. Thus, the input signal is modified to make it self-cancel residual vibrations. The effectiveness, in terms of moving-platform oscillation attenuation, of the proposed closed-loop control method combined with shaping inputs is experimentally studied on a suspended and nonredundant CDPR prototype. This confirms residual vibration reduction improvement with respect to the unshaped control in terms of peak-to-peak amplitude of velocity error, which can achieve 72% while using input-shaping filters.

scholarly journals Wind Turbine Speed Compound Control of a New-Type Wind-Electric Hybrid Power Pumping Unit

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Chunyou ZHANG ◽  
Lihua WANG
Keyword(s):  
Wind Speed ◽  
Power System ◽  
Control Method ◽  
Mathematic Model ◽  
Hybrid Power System ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Hybrid Power ◽  
New Type ◽  
Pumping Unit

Because the load of the oil beam pumping unit driven by pure electric motor changes sharply during operation, the power of the driving motor does not match and the energy efficiency is low. In this paper, a new type of wind-driven hydro-motor hybrid power system is proposed. The motor and the hydraulic motor are jointly driven, and the energy is recovered by a hydraulic pump with controllable displacement, so that the speed of the driving motor is relatively stable. In order to control the fan speed and keep up with the drastic changes of the outside wind speed, a control strategy of hybrid power system based on wind speed feed-forward compensation is proposed. Through simulation and experimental results, the following conclusions can be drawn: to begin with, the mathematic model is proved to be effective; next, simulation studies show that the proposed feed-forward control method can improve the response rate as well as reduce the response lag. This research can be a reference for the application of the feed-forward control method on the hybrid power system of beam pumping unit.system.

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