One of the heavy equipment that play role in development projects is the excavator. An excavator can perform construction work such as digging, splitting, loading and so on. Laboratory of Hydraulics and Pneumatics Mechanical Engineering Faculty of Engineering, University of Riau has produced a model excavator using pneumatic system, support on a controller box, equipped with buttons setting and motion rotary swing 120o. The research has modifications control system, remove the control box under the excavator and change to the remote system. The motion rotary swing system has changed from 120o to 360o. The purpose is all movements similar in general excavator. The result, excavator model using power 12V DC the control system and compressed air drive pneumatic system. The results of testing control system work to properly, the rotary motion of the swing system 360o and use electric voltage 7,5V will have speed 13,598 rpm, so swing motion from the excavator model similar in general.
Laboratorium Hidrolik dan Pneumatik, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Riau, Indonesia.
Design for Assembly (DFA) is one of method in the assembly systems to ease the assembly during simultaneous process from the beginning until become new products of the whole components. However, the obstacles in assembly process could be occurred in waste separation machine. Therefore, in order to obtain the optimization of assembly process, it is needed to conduct an analysis of component design before the production. DFA analysis will obtain the value of assembly efficiency. The efficiency value of prototype machine will achieve a way to separate the waste, both ferromagnetic and non-ferromagnetic materials. Furthermore, efficiency value theoretically on assembly of waste separation machine is 14.22% at 548.47seconds. The efficiency value of waste separation machine after assembly process in actual condition is 11.83% at 658.88seconds. The distinction efficiency value is caused by difficulties in assembly of the belt roller and sub assembly of base support on motor. As consequences, the time to get assembly will take more time on actual condition rather than theoretically.
Production Technology Laboratory, Department of Mechanical Engineering, Faculty of Engineering, Universitas Riau, Indonesia
PT. Riau Solusi Teknik, Riau, Indonesia
Department of Electrical Engineering, Faculty of Engineering, Universitas Riau, Indonesia
Red mud received from NALCO, Odisha, India has been subjected for sieve analysis and milled to 42 nanometers using high energy ball mill. Pure aluminium powder of 99.72% purity as matrix with red mud as reinforcement at 2%, 4%, and 6% weight fractions at micro as well as nano levels. Micro and nano structured red mud powders and pure aluminium are mixed in a V-blender, compacted at a pressure of 40 bar and samples are prepared by conventional sintering. The mechanical properties of Aluminium-Red mud micro and nano composites are evaluated with respect to hardness and compression strength. The experimental compression strength values are validated by Deform-2D software. An increase in hardness and compression strength is observed with increase in the amount of percentage weight fraction of Red mud. Wear characteristics are investigated using pin-on-disc wear testing machine and evaluated the prediction of optimal combination of pure aluminium and weight fraction of micro and nano structured red mud powder using Regression analysis. Highest wear resistance is observed for the test specimen with 42 nm size and 6% weight fraction of red mud powder at 600 RPM speed.
Department of ME, University College of Engineering, JNTUK, Vizianagaram -535003, India
Department of ME, National Institute of Technology, Warangal - 506004, India
Department of ME, S.R Engineering College, Warangal - 506371, India
Ducted propellers used in many vessels, especially fishing vessels, trawlers and submarine which provide the higher efficiency. In this article, the effects of the duct length and duct angle are investigated on the hydrodynamic performance. First, did the modeling of duct 19A. The Kaplan propeller performance with nozzle 19A by turbulence model of SST-K-ω analyzed and validated with experimental results that indicate acceptable accuracy. Finally, by changing the nozzle at a rate of 10% and 20% of the original length of the nozzle and also change the angle of the nozzle, analyzed the effects of the changes made. The Kaplan propeller with 19A nozzle is selected for case study. A Reynolds Average Navier-Stokes (RANS) turbulence model of the SST-K-ω employed for the present calculations. Numerical results are included pressure distribution, hydrodynamic characteristics and velocity behind the propeller at various geometry and physical conditions. Comparisons of the results are shown with acceptable agreement by the experimental data. It is concluded that the position of the propeller and increasing the duct angle inside the duct may be limited.
Department of Marine Engineering, Imam Khomeini University, Nowshahr, Iran
Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran