This paper studies the causes of brake failure in commercial mini-buses in Kumasi, Ghana. A structured questionnaire was administered at (20) bus terminals, (65) automotive workshops and (25) government institutions. The researcher met the personnel in charge of these institutions and explained the objectives of the research. The questionnaire was left with the authorities overseeing these institutions and the response was collected at a later date. In all a total of (485) people were surveyed. The results and responses suggested that the main causes of brake failure in mini-buses are: Overheating of the brake assembly due to prolong application of the brakes, low brake fluid level as a result of defective rubber seals in the master cylinder and air trapped in the braking system resulting in spongy brakes and reducing braking efficiency. The survey results showed that brake failure in commercial minibuses is caused mainly by Overheating of the brake assembly due to prolong application of the brakes. The survey responses suggest that the braking system should be inspected and serviced periodically in order to minimize the rate of brake failure in mini-buses.
This work discusses performance analyses of a flywheel energy storage system rotor using ansys. Design of a rotor based on 3D modeling and simulation is presented, the flywheel theory is also studied. A basic static structure and modal analyzes were carried out to evaluate the performance of the model rotor under these condition and the results discussed. Rotor analysis is performed in which a rotor model designed in solid works is imported into the ansys 14.5 environment for the analysis to be performed. The rotor model undergoes various forms of vibrations and deformation analysis using ansys 14.5 software and the results examined and discussed. Increasing rotor rotational speed above its safe critical limits influences the behavior of the natural frequency due to higher gyroscopic and moments of inertia which will eventually results in the non-performance of the rotor thereby causing total deformation to the rotor model during its operational cycle.
In this research paper a rotor which serves as a rotating structure is driven by a 4KW alternating current motor through couplings which is suspended byan active magnetic bearingwith its position Sensors and Hall Effect Sensors connected in place which are finally connected to a main computer. A digital link which interface between the DSP and the general mathematics program is made to run on computer in which all the forces and the displacement signals are available in analog whichthen processed and finally display the results. Natural frequencies and mode shapes were used for predicting dynamic behaviors of rotor model, in determing this the free-free system were assumed without putting the bearings in operation and then subsequently the rotational speed was set, the first three natural frequencies of the system without rigid modes with its corresponding values was used as the process and stages observability and controllability of the rotor system during the experiment and the analysis process. Modal analysis was then performed for the free-free boundary conditions for the rotor system with bearing conditions when the rotor speed was equal to 20000rpm. The structure under investigation was established with a measured model input-output impulse response functions and the results studied and discussed.
This paper studies the relationship between the tyre pressures used by drivers and the vehicle manufacturers recommended tyre pressure. First of all, a survey of vehicles on Kwame Nkrumah University of Science and Technology (KNUST) campus was done to ascertain how tyre pressures of these vehicles deviate from the vehicle manufacturers recommended tyre pressures. Then the survey was extended to other four places namely, Kumasi Polytechnic campus, Asafo, Roman Hill and Kejetia bus depots. The survey showed that most of the vehicles tyre pressures deviate from the vehicle manufacturers recommended tyre pressure. Out of 660 vehicles surveyed in these five areas in the Kumasi Metropolis, 96.52% (637) had their tyre pressures deviated from the vehicle manufacturers recommended tyre pressures. That means only 3.48% (23) of these vehicles had their measured tyre pressures conforming to the vehicles manufacturers recommended tyre pressures. Most vehicles in the Kumasi Metropolis have their tyre pressures deviating from the vehicle manufacturers recommended tyre pressures. Strong education should be given to drivers on the need to use the correct tyre pressures.
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