Vol. 19 No. 1 (2004)

Ignition delay is an important parameter in diesel engine operation. It is defined as the time (or crank angle degree) between the start of injection and the start of combustion. Ignition delay should be kept as short as possible, otherwise diesel knocking can occur if the delay is too long. Many works have shown that increasing fuel cetane number may shorten the ignition delay. In conjunction with the BPBT "“ PPKS Biodiesel Project to utilize methyl ester palm oil (sawit) (MES) as an alternative fuel, several compositions of MES-conventional diesel fuel blends were tested. Cetane number of…

Research and development of Robot Vision activity requirs a Moving platform with high mobility on translation as well as rotation movement. Omnidirectional vehicle reported here has optimum planar movement in the form translational movement on any direction as well as turning radius from zero to infinity, therefore it is suitable as a moving platform for research activities on 2 dimensional Robot Vision. Testing and measurement on the accuracy of vehicle straight trajectory on different direction have been carried out. Some error compensation algorithm has been applied and some good results…

This study is aimed to produce CAM software run under AutoCAD 2000 or latest version using Visual Basic for Application (VBA) program. Machining processes are carried out using endmill cutter at X-Y plane. Input of this software is 3-D drawings of the model. The output of this software are G-Code of cutting tool path. The software also provides fasilities to approach spline and ellips with connected lines but still considering geometric tolerances of line profile.

This paper discusses the stability of Wing-in-Surface-Effect (WiSE) craft. The aerodynamic parameters of new WiSE craft jointly designed by the Agency for the Assessment and Application of Technology, Indonesian Aerospace Ltd. and Institute of Technology Bandung are estimated using software Digital Datcom of the US Air Force. The aerodynamic parameters are used to predict the longitudinal stability characteristics of the WiSE craft. The surface effect on some aerodynamic parametes that influence the longitudinal stability of the WiSE craft will be discussed in this paper.

Cooling of clinker into grate cooler is one of important processes in cement manufacturing because it influences the quality of the clinker and also determines heat recovery of the combustion air which related well to the fuel consumption. Heat transfer mechanism of the clinker cooling comprises radiation, convection, and conduction. This paper presents a numerical method of clinker cooling process on a grate cooler in order to evaluate temperature distribution of both clinker and cooling air in vertical and horizontal directions along the grates. The result was validated with the measurement…