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Modeling and control of railway vehicle active suspension actuators
International Islamic University Malaysia
Kulliyyah of Engineering, International Islamic University Malaysia
Nowadays, researchers are concentrating in light weight vehicle with higher speed requirement due to the increasing of competitions in all sectors of transportation industries without reducing the passenger ride comfort. But maintaining the ride quality in high speed vehicle with existing passive suspension has reached its limits. So it suggests that to overcome this problem, active suspension system should be used. The previous studies over the last few decades suggest that active suspension technology can provide better solutions to overcome the passive suspension limitation with improved passenger's ride quality. The aim of this research is to concentrate on actuator technology in the active secondary suspension system of railway vehicle. This research investigated the possibilities to develop controller solution to control the actuators across the secondary suspension of a railway vehicle. After extensive literature review the electromechanical actuator is chosen across the secondary suspension of railway vehicle. To improve the performance of the actuator, a PI plus Phase advance compensator was designed before placing the actuator in the secondary suspension system. After introducing the actuator inside the suspension system, the performance of the actuator was reduced to a certain level. So to overcome this problem, retuning of the actuator controller was necessary. Additionally, to improve the performance of the total suspension system and actuator, a conventional PID and fuzzy-PID controllers were developed and implemented in the secondary suspension. These two controllers were designed to control the suspension and also actuator outputs. After simulation, an existing test rig is selected for the quarter car railway suspension system experiment. After that an electromechanical damper is designed and constructed in the laboratory. The finite element analysis (FEA) analysis of electromechanical damper's 2-D axisymmetric model has also accomplished before constructing the damper. Then, the others additional parts such as sensory systems, an arduino controller device and a relay module were installed to the test rig. Finally, the electro-dynamic shaker was introduced to complete the setup of the quarter car suspension system with proper controllers and power amplifiers. By using the shaker total three excitation inputs (sinusoidal, random and chirp) were created to test the performance of the active secondary suspension system. The overall experiment is carried out by both passive and active condition under the same (sinusoidal, random and chirp) excitation inputs. The results indicate that active suspension system provides better performance than passive suspension system in terms of vehicle body acceleration and displacement. So the ultimate outcome of this research is that after introducing active controller and electromechanical damper to the secondary suspension system, the ride quality and vehicle safety has improved over passive suspension system.
" A thesis submitted in fulfilment of the requirement for the degree of Master of Science in (Mechatronics Engineering)."--On t.p.
Thesis (MSMCT)--International Islamic University Malaysia, 2016.
Includes bibliographical references (leaves 145-150).