Steering Angle Control of Rack Steering Vehicle using Antiwindup-PI-Control

The precision of the steering in a vehicle is one of the issues that need to be tackled for safety and energy efficiencies, especially in the motion at the cornering or turning. The issue is crucial especially for vehicles with a non-holonomic system such as rack steering vehicles, as it is more prone towards high collisions to the peer walls or off-road incidents due to the inertia factor. Therefore, this has taken the initiative to propose a steering precision control strategy using the proportional and integral (PI) control that considers the Rack Steering Vehicle (RSV) dynamics and its friction as well as aerodynamics disturbances. The control objective is emphasized on steering input precision in which steering feedback response is derived from the vehicle dynamics with disturbances. The RSV model and the antiwindup-PI control are model and simulated in order to verify the proposed control strategy for the RSV system. The results show that with small fine tunes on the antiwindup-PI controller, the steering input is controlled precisely with a very minor steady-state error if compare to the single PI controller. Regarding vehicle axial velocities, both horizontal (X-axis) and vertical (Y-axis) velocities are controllable without radical fluctuated as well as oscillation speed if compare to the RSV with PI controller

Impedance control approach in robot's leg dragging velocity variations

One of the challenging areas in developing bio-inspired legged robot is dynamic control, especially in environment interaction. Impedance control is widely used by researchers for dynamic interaction, but the majority only focus on adapting uneven terrain structure. This idea may not be suitable for pick-and-place task robot that has different weight due to its body weight and payload as well as locomotion on flat terrain. Thus, this paper presents leg velocity control through impedance control approach with the aim to increase the energy of the legged robot especially during leg dragging based on force on contact. The results show that proposed controller is applicable since it increases the energy and velocity of leg motion due to increase in force on contact while maintaining the shape of the leg motion

Modeling and Analysis of Omnidirectional Wheeled Vehicles Using Velocity-based Impedance Control

This paper presents the velocity-based impedance control that would account for the inertia forces acting on the omnidirectional wheeled vehicle duriing cornering motions. As favorable omni-vehicle, omnidirectional mecanum wheeled vehicle (OMWV) was selected as a platform in this study. Concerning the problem statements in the dynamic analyses, the control design has considered the difference in vehicle forces because the vehicle's interaction forces were indirectly controlled by the vehicle's velocities. The axial velocities control of the OMWV, vertical and horizontal axial motions on cornering periods were highlighted in this research. The simulation results show that with velocity inputs, the different forces on the OMWV axial motion of the vehicle could be reduced. Furthermore, the reduction in vehicle velocity influenced the overall kinetic energy of the system, which reduced the inertia effect

Steering Vehicle with Force-based Impedance Control for Inertia Reduction

This paper presents the inertia control on a steering rack vehicle using interaction control approach through forcebased impedance control. Overdriven factor in a vehicle motion especially on a cornering track, is one of the issues that need to be tackled for safety and energy efficiency. Hence, in the attempt to cope with the issue, this study proposes to implement a dynamic control technique that considers the interaction between the vehicle and its terrain by using indirectly shaping inertia forces. The proposed force-based impedance control is derived by considering the forces developed by the rack steering vehicle and shaping the vehicle velocities as its kinodynamic inputs. The implementation of the proposed dynamic control, emphasis is given to the vertical and horizontal axes of the vehicle body, during which inertia could happen as its velocity is at its lowest. This proposed dynamic control strategy is verified by simulating on the steering system model with road terrain and aerodynamic frictions as disturbances. The simulation results shows that the proposed system is able to reduce the inertia forces via shaping the velocity inputs to the vehicle, even though road terrain and aerodynamic frictions are present in the cornering tracks

Forkloader Position Control for A Mini Heavy Loaded Vehicle using Fuzzy Logic-Antiwindup Control

This paper presents a proposed integrated Takagi-Sugeno-Kang (TSK) type Fuzzy Logic control (TSK-FLC) with Antiwindup elements for a forkloader position control of a Mini Heavy Loaded Forklift Autonomous Guided Vehicle (MHeLFAGV). The study was carried out by modeling TSK-FLC as a close-loop control for the each axis of the fork-lift’s movement. The degree of membership is designed with reference to the system response, in which ultrasonic sensor with 1cm resolution is used. Moreover, the rule base is determined and optimized to deal with microcontroller processing speed. In order to cater for the windup phenomenon, a proportional and integrated antiwindup elements are integrated into the TSK-FLC model. This control strategy consumes less memory and is expected to increase the time response of the control system. The experiment and analysis is done on the actual forkloader unit of MHeLFAGV system. The experiment was done on the vertical axis motion since horizontal motion will have the same characteristic pattern of implementation and characteristic of tuning. The experiment shows that the proposed integrated TSK-FLC with antiwindup elements is able to speed up the time response of the system and eliminate the overshoot as well as oscillation on the forkloader movement. 

Enhancing precision on pneumatic actuator positioning using cascaded finite-time prescribed performance control

Cascading methods becoming widely used in practice especially on improving conventional control such as PID. Therefore, to enhancing the capability of cascaded PID control in handling highly nonlinear system, this research proposed a finite-time prescribed performance control with cascaded PID (FTPPC-CPID). The research is focused to cater the nonlinearities and uncertainties of pneumatic rod-piston positioning by considering both its displacement and velocity feedbacks. The pneumatic proportional valve with a doubleacting cylinder (PPVDC) model plant is employed as a targeted plant and comparison studies were done with the conventional cascade PID controller. The results show the proposed FTPPCCPID performing able reduce steady-state errors with fast response and a very minimum overshoot in transient of rod-piston positioning with different trajectory inputs and payload as extrinsic disturbance

Forkloader Position Control for A Mini Heavy Loaded Vehicle using Fuzzy Logic-Antiwindup Control

This paper presents a proposed integrated Takagi-Sugeno-Kang (TSK) type Fuzzy Logic control (TSK-FLC) with Antiwindup elements for a forkloader position control of a Mini Heavy Loaded Forklift Autonomous Guided Vehicle (MHeLFAGV). The study was carried out by modeling TSK-FLC as a close-loop control for the each axis of the fork-lift’s movement. The degree of membership is designed with reference to the system response, in which ultrasonic sensor with 1cm resolution is used. Moreover, the rule base is determined and optimized to deal with microcontroller processing speed. In order to cater for the windup phenomenon, a proportional and integrated antiwindup elements are integrated into the TSK-FLC model. This control strategy consumes less memory and is expected to increase the time response of the control system. The experiment and analysis is done on the actual forkloader unit of MHeLFAGV system. The experiment was done on the vertical axis motion since horizontal motion will have the same characteristic pattern of implementation and characteristic of tuning. The experiment shows that the proposed integrated TSK-FLC with antiwindup elements is able to speed up the time response of the system and eliminate the overshoot as well as oscillation on the forkloader movement

Improving pressure valve precision using finite-time prescribed performance with fractional-order proportional, integral and derivative control

The paper presents the improvement of precision control on pneumatic system pressure using Finite-time Prescribed Performance Control with the Fractional-Order Proportional, Integral, and Derivative (FOPID-FTPPC) control. The control strategy is proposed to overcome the nonlinearity produced by the pneumatic system in regulating the pressure on positioning operation. The study was conducted through several experiments with a 5/3-way pneumatic proportional valve that configured with pressure transducers as feedback responses. The study was done with two different types of common input trajectories: step and sinusoidal inputs. The proposed FOPIDFTPPC controller outperforms the FOPID controller by 26% in terms of minimizing the overshoot of the step input trajectory. On the other hand, the proposed controller exhibits significant performance with a sine wave input trajectory, and the advantage of its integration with FTCPPC frameworks allows it to achieve steady state performance even more quickly. The findings demonstrate that the proposed the proposed FOPID-FTPPC controller can regulate the pneumatic systems pressures while eliminating steady-state errors, fast response as well as reducing the overshoot

Robot Local Network Using TQS Protocol for Land-to-Underwater Communications, Journal of Telecommunications and Information Technology, 2019, nr 1

This paper presents a model and an analysis of the Tag QoS switching (TQS) protocol proposed for heterogeneous robots operating in different environments. Collaborative control is topic that is widely discussed in multirobot task allocation (MRTA) – an area which includes establishing network communication between each of the connected robots. Therefore, this research focuses on classifying, prioritizing and analyzing performance of the robot local network (RLN) model which comprises a point-to-point topology network between robot peers (nodes) in the air, on land, and under water. The proposed TQS protocol was inspired by multiprotocol label switching (MPLS), achieving a quality of service (QoS) where swapping and labeling operations involving the data packet header were applied. The OMNET++ discrete event simulator was used to analyze the percentage of losses, average access delay, and throughput of the transmitted data in different classes of service (CoS), in a line of transmission between underwater and land environments. The results show that inferior data transmission performance has the lowest priority with low bitrates and extremely high data packet loss rates when the network traffic was busy. On the other hand, simulation results for the highest CoS data forwarding show that its performance was not affected by different data transmission rates characterizing different mediums and environments