http://41.74.91.244:8080/handle/123456789/71 2026-04-05T04:46:30Z 2026-04-05T04:46:30Z Okai R. http://41.74.91.244:8080/handle/123456789/606 2023-05-29T11:23:34Z 2009-01-01T00:00:00Z

Influence of vibration coupling between bandsaw frame and feed-carriage system on sawdust spillage and surface quality of workpiece during sawing [Einfluss der Schwingungskopplung zwischen der Bands�ge und dem Vorschubwagen auf den Schnittverlust und die Oberfl�chenqualit�t des Schnittholzes] Okai R. Productivity, surface quality, and recovery are three parameters that compete for attention during lumber production. The well known phenomenon of improved surface quality with decreasing workpiece feed rate has been reported by several researchers. This paper reports on experimental results from the relationship between workpiece feed rate or bite per tooth and the surface roughness of Japanese Sugi (Cryptomeria japonica) using a bandsaw machine whose feed-carriage is coupled to the bandsaw frame. The volume of sawdust produced during sawing was determined using an electronic balance. Equation was developed to determine the kerf-losses. It was observed that as the workpiece feed rate increased, or as the bite per tooth increased, the saw blade vibration decreased and the volume of sawdust also decreased contrary to expected results. Furthermore it was observed that with increasing workpiece feed rate the surface roughness decreased contrary to expected results. On the other hand, when the carriage feed rate increased the saw blade deviation also increased as expected. The research findings clearly suggest that when there is vibration coupling between the feed-carriage and the entire bandsaw frame, the amplitude of the saw blade vibration and the surface roughness decrease as the bite per tooth increases. Thus the bandsaw machine whose frame is coupled to the feed-carriage is a promising technique for increasing lumber recovery and improving upon surface quality. � 2009 Springer-Verlag. Okai, R., Department of Design and Technology Education, University of Education, Winneba Kumasi Campus, P.O. 1277, Kumasi, Ghana

2009-01-01T00:00:00Z Oduro S.D. Ansah P.O. Agyamang A. http://41.74.91.244:8080/handle/123456789/581 2023-05-29T11:05:22Z 2013-01-01T00:00:00Z

An experimental analysis of brake efficiency using four fluids in a disc brake system Oduro S.D.; Ansah P.O.; Agyamang A. The paper studies disc brake failure in Mini-buses using an experimental analysis to test the maximum braking force when different brake fluids such as clean, less dirty, dirty and soapy water solution were used in the braking system. The experimental results clearly showed that the soap solution appears to be the best fluid as far as low viscosity and stability of viscosity with increase in temperature are concerned. However, the soap solution is not compatible with other fluid which makes it difficult to be substitute as a clean brake fluid. The result of the Thepra Universal Brake Testing Equipment used for the braking efficiency test indicated that a pedal brake of 117 kN produce a brake force of 0.96 kN for clean brake fluid, 0.91 kN for the less dirty, 0.85 kN for dirty and 1.44 kN for soap solution. The value of 1.44 kN which was achieved when the soap solution was used indicated a positive braking force and the indicating that soap solution could be used to produce a high pedal force within a very short time (about 10-30 min) and can therefore be used only in case of emergency. The brake efficiency test indicated that under hot conditions the braking efficiency is reduced and the presence of air in the system renders the braking ineffective because higher pedal force was needed to be able to produce a significant braking force which is noted for causing brake failure. � Maxwell Scientific Organization, 2013. Oduro, S.D., Department of Design and Technology Education, University of Education Winneba, Kumasi Campus, P.O. Box 1277, Kumasi, Ghana; Ansah, P.O., Department of Mechanical Engineering, Kumasi Polytechnic, P.O. Box 854, Kumasi, Ghana; Agyamang, A., Department of Mechanical Engineering, Kwame Nkrumah University of Science and Technology, KNUST, Kumasi, Ghana

2013-01-01T00:00:00Z Oduro S.D. Alhassan T. Owusu-Ansah P. Andoh P.Y. http://41.74.91.244:8080/handle/123456789/580 2023-05-29T11:32:12Z 2013-01-01T00:00:00Z

A mathematical model for predicting the effects of tyre pressure on fuel consumption Oduro S.D.; Alhassan T.; Owusu-Ansah P.; Andoh P.Y. This study studies the relationship between tyre pressure and fuel consumption of vehicles using experimental methods and mathematical model to predict vehicle fuel consumption. The model obtained was F = 0.6272- 2.5941p+3.3428p2�0.018 where F is the fuel consumed and p is the tyre pressure of a vehicle, which can also be used to predict the amount of fuel consumed by other vehicles. The model was validated with its own data which showed a deviation of �5% which is within experimental error. Using the recommendedtyre pressures the model reduces the fuel consumption by 17.6% thus reducing cost of fuel. From theexperiment, it was observed that the relationship between the fuel consumption and the tyre pressures of various vehicles is in the form of F = B2p2 - B1p+B0� e, where B0, B1, B2 and 'e' depends on other factors of the vehicle such as the age of thevehicle and the conditions under which the measurements were taken. This equation can be used to predict fuel consumptions for vehicles when their tyre pressures are known. In all, it was seen from the research that any deviation in tyre pressure of vehicles resulted in an additional fuel consumed by vehicles. It is recommend that, there should be a massive public education or awareness about the need to keep recommended tyre pressure at all times because when tyre pressure falls below the recommended value, the decrease in the pressure invariably leads to an increase in fuel consumption. � Maxwell Scientific Organization, 2013. Oduro, S.D., Department of Design and Technology Education, University of Education Winneba, Kumasi Campus, P.O. Box 1277, Kumasi, Ghana; Alhassan, T., Department of Mechanical Engineering, Kumasi Polytechnic, P.O. Box 854, Kumasi, Ghana; Owusu-Ansah, P., Department of Mechanical Engineering, Kumasi Polytechnic, P.O. Box 854, Kumasi, Ghana; Andoh, P.Y., Department of Mechanical Engineering, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana

2013-01-01T00:00:00Z Amoah M. Cremer T. http://41.74.91.244:8080/handle/123456789/495 2023-06-16T12:03:35Z 2017-01-01T00:00:00Z

Net calorific values and mineral concentration of thirteen tree and shrub species in Ghana Amoah M.; Cremer T. Obtaining accurate and reliable information on biomass characteristics of tree species is important as it aids in selecting plant species that optimize fuel production for bioenergy. In this study, the net calorific value (NCV) and mineral concentration of 13 plant species selected from the Guinea savanna ecological zone of Ghana were investigated. Significant variation in NCV across the species components was found, with branch wood from most of the species exhibiting higher values compared to stem wood or the bark tissues. Accurate and reliable information on plant biomass could therefore be obtained through plant partitioning. High mobility of Zn and Pb after uptake was observed in the studied species. Apart from Cd whose concentrations in the species exceeded the recommended levels, no toxic levels were observed for the rest of the heavy metals. Thus, the major drawbacks in the use of the species as biomass resource are their higher concentrations of Cd and to some extent, higher ash contents. On account of the relatively high NCV, low ash content and low mineral concentrations, D. microcarpum, and C. febrifuga were found to be most suitable candidates for biomass production and subsequent bioenergy optimization in the Guinea savanna of Ghana. � 2017 Taylor & Francis. Amoah, M., College of Technology Education Kumasi, University of Education, Winneba, Ghana; Cremer, T., Department for Forest Utilization and Timber Markets, Eberswalde University for Sustainable Development, Eberswalde, Germany

2017-01-01T00:00:00Z