Ramazan Akkaya

Bio: Ramazan Akkaya is an academic researcher. The author has contributed to research in topics: Wheelchair. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Design and implementation of a test setup for electric mobility scooter for the disabled

Abstract: In this study, a test setup was designed for three- and/or four-wheeled electric mobility scooter models used by disabled or old people. This system is composed of a test platform that enables meas...

Study on relevance between electric wheelchair riding comfort and user exposure to whole-body vibration

Abstract: This paper describes user's mechanical vibration and shock while riding the electric wheelchair on the different road conditions. We conduct experiments for measurement of 9-Axis data by using the 9-Axis sensor implemented on the actual electric wheelchair. Then, we investigate the relevance between the comfort of wheelchair user and the vibration. The vibration characteristics of the human body and their effects are discussed.

The Effect of Road Slope on Parameters of Disabled Vehicle Driven by PMDC Motor

Abstract: In this study, the effect of road slope on the electrical and mechanical parameters of a disabled vehicle and regenerative braking was investigated on a 4 wheel disabled vehicle driven by a permanent magnet direct current (PMDC) motor. For this purpose, the test system, which was designed by the authors in order to test such vehicles in a laboratory environment, was developed in a way that allows the vehicle to be tested in external environments. This test system consists of a data acquisition card (DAC), related sensors, and an interface prepared in the C# program. Using the DAC, currents, voltages, speed, road slope, and temperatures were measured instantaneously during the test process and then transferred to the computer instantly. Using these data, the motor's speed, the motor's torque, the motor's shaft power, the yields of the motor and the driver, the vehicle's instantaneous speed, and the total covered distance were calculated during the experiment in real-time by the interface. At the same time, these data were graphed and saved. Tests were carried out on roads with a positive and negative slope. Finally, the data obtained from these tests were analyzed and the alterations in the electrical and mechanical parameters of the disabled vehicle depending on the road slope were clearly demonstrated by numerical data.

Two Functional Wheel Mechanism Capable of Step Ascending for Personal Mobility Aids

Abstract: Obstacles such as ramps, steps, and irregular floor surfaces are commonly encountered in homes, offices, and other public spaces. These obstacles frequently limit the daily activities of people who use mobility aids. For this purpose, this study solves a slope minimization problem for personal mobility aids. As a solution approach, a gradient-reduction scheme is proposed, which allows existing mobility aids to reduce the required horizontal forces and vibrations when ascending steps while maintaining their wheel sizes. Practically, an axle-transitional wheel mechanism realizing the gradient-reduction computation model is established, and its step-ascending wheel prototype is developed. Specifically, since the proposed wheel enables integration into existing personal mobility-assisting devices, two functional roles, such as rolling and step ascending, can be used. The developed step-climbing wheel can help the users of mobility aids mitigate the aforementioned limitations. The physical and mental burdens of caregivers and medical staff can also be reduced by making the users of the gradient-reduction scheme more self-sufficient. This study provides details on the axle-transitional wheel mechanism and its step-ascending wheel prototype. The findings are analyzed mathematically, and their functionality is verified through extensive experiments using a prototype.