Ahmad Anas Yusof

Equilibrium, Kinetics, and Thermodynamics of Remazol Brilliant Blue R Dye Adsorption onto Activated Carbon Prepared from Pinang Frond

The adsorption of remazol brilliant blue R (RBBR) dye on pinang frond based activated carbon (PF-AC) was investigated in a batch process. The effects of initial dye concentration, contact time, solution temperature, and solution pH were evaluated. The adsorption equilibrium and kinetic were found to follow Freundlich isotherm models and pseudo-second-order kinetic model, respectively. The mechanism of the adsorption process was found from the intraparticle diffusion model. Result from adsorption thermodynamic show that interaction for RBBR dye was found to be feasible, nonspontaneous, and endothermic. The results indicated that the PF-AC is very effective for the RBBR adsorption from aqueous solution.

Tele-operation Construction Robot Control System with Virtual Reality

Abstract In this paper, a tele-operation construction robot control system with virtual reality is investigated. The system consists of a servo-controlled tele-operation construction robot, two joysticks for controlling the tele-operation construction robot, and 3-dimensional virtual environment. Computer graphics (CG) of the tele-operation construction robot and task objects in virtual scene are presented to the operator as a tool for assisting tele-operation. And the operator performs the remote operation of the construction robot by manipulating the graphic robot directly in virtual environment using the joysticks. The position and shape of the task objects in virtual world are updated in real-time on basis of image information obtained by a stereo camera fixed in the remote field. To improve the efficiency as well as security of tele-operation, and overcome the shortcomings (such as time-consuming judgement and mistaken selection of screen to be observed) of conventional three-screen visual display, the methods of auto point of view (APV) and semi-transparent object (STO) are introduced in this paper. Finally, A comparative study of a one-screen visual display combining APV and STO with the conventional three-screen visual display is carried out based on the results of evaluation experiments (task efficiency, risk indexes, questionnaire). These experiments confirmed that one-screen visual display combining APV and STO is superior in operability, safety, and reduction of stress.

Research Development of Energy Efficient Water Hydraulics Manipulator for Underwater Application

This paper presents research development of water hydraulicsmanipulator testrig for underwater application at Centre for AdvancedResearch on Energy, Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka. The test rig is designed in order to study the effectiveness of using water hydraulics system for underwater manipulation application. With objectives to promote sustainability and energy saving, the manipulator system is targeted for usage in an underwater scenario, possibly on small submarines or underwater remotely operated vehicles (ROVs).Underwater vehicles normally utilize the use of oil hydraulics for propulsion, manipulation and instrument control. The research on underwater manipulator that uses the surrounding sea water itself as the power and energy carrier for control is now possible with the current development in water hydraulics technology.

Underwater manipulator’s kinematic analysis for sustainable and energy efficient water hydraulics system

In promoting energy saving and sustainability, this paper presents research development of water hydraulics manipulator test rig for underwater application. Kinematic analysis of the manipulator has been studied in order to identify the workspace of the fabricated manipulator. The workspace is important as it will define the working area suitable to be developed on the test rig, in order to study the effectiveness of using water hydraulics system for underwater manipulation application. Underwater manipulator that has the ability to utilize the surrounding sea water itself as the power and energy carrier should have better advantages over sustainability and performance.

Promoting water hydraulics in Malaysia: A green educational approach

In promoting water hydraulics in Malaysia, this paper presents research development of water hydraulics educational training system for secondary and tertiary levels in Malaysia. Water hydraulics trainer with robotic attachment has been studied in order to promote the usefulness of such educational tools in promoting sustainability and green technology in the country. The trainer is being developed in order to allow constructive curriculum development and continuous marketing research for the effectiveness and usefulness of using water in hydraulic power trainer. The research on water-based hydraulic trainer is now possible with the current development in water hydraulics technology.

Modern practical application and research on teleoperated excavators control, feedback and perception issues in post disaster recovery operation

This paper discusses the modern practical application and research on teleoperated excavators and related issues regarding the use of such system in high risk and dangerous post disaster recovery operation. We describe the issues of teleoperated excavator system, with respect to control strategy, feedback displays, perception, latency, master-slave technology and sustainability. Practical application in Japan for post disaster recovery operation and various research developments in unmanned and teleoperated construction system are also presented. The recent development in various disasters in Malaysia should enlighten the public and the government on the future direction in the advanced technology for disaster risk reduction and post disaster management in the country.

Promoting Sustainability through Water Hydraulic Technology – The Effect of Water Hydraulic in Industrial Scissor Lift

Sustainability concern has brought the idea of exploring the possibility of using water as the hydraulic medium to transfer energy. The abundant resource of water, and its characteristic involving hygiene, safety and low maintenance cost provides a fascinating perspective of choosing water over hydraulic oil, due to concerns over oil disposal, contamination, costly maintenance and flammability. However, in contrast, its low boiling temperature, low viscosity, and simple molecular structure could pose danger to the operation of the hydraulic system. In order to identify these limitations, an experimental study is carried out to explore the effect of water hydraulic system. A test rig of scissor lift is fabricated and put into test by replacing the hydraulic oil with reverse osmosis water. It is found that the water hydraulic scissor lift managed to lift up to 400 kg of load, with workable water temperature of 41.4°C.

The development of tele-operated electro-hydraulic actuator (T-EHA) for mini excavator tele-operation

High risk and dangerous post disaster recovery operation requires the use of heavy vehicle tele-operation. This study deals with tele-operated electro-hydraulic actuator system or T-EHA for the operation of construction vehicle tele-operation that focuses on a robotic system to remotely control a mini excavator. The current development of the system, from design, simulation and control aspects of T-EHA is presented. A wireless PS2 controller with Arduino programming has been utilized as the remote controller for the system. The T-EHA system is later used to control a lever which is used to manipulate the movement of the mini excavators boom. Simulation on the position control of T-EHA is conducted at a designated signal interval, with system flow rate and pressure of 0.7lpm and 20 bar respectively. The overall movement correlates with the simulated input signal. Laboratory evaluation on T-EHA tele-operation have been conducted at a distance of 5 meters, accordingly.

Development of Water Hydraulic System

Common hydraulic system using hydraulic oil as their working medium but there is an application using water due to high accessibility and environmentally concern.Water hydraulic is an attractive technology to use water as the pressure medium in hydraulic system. In this paper, water hydraulic system is design and develops that capable to use water as pressure medium. Water is used to provide clean environment and safe for the mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. Some of water challenged as the pressure medium in hydraulic system were considered during build and design the system to minimize the bad effect of water in hydraulic system. Besides, the arrangement of hydraulic components on the test rig also considered to optimize the water hydraulic system performance. Water hydraulic system performance was analyzed by measured maximum pressure produced from water pump and system efficiency. Others, the effect of temperature increment in water hydraulic system also analyzed to optimize operation time.

Fluid structure interaction computational analysis of hydraulic intensifier

Fluid Structure Interaction (FSI) is relatively new branch of Computational Fluid Dynamics (CFD). Modelling of hydraulic accumulator to withstand high pressure is needed to be used using FSI method. This method utilize Arbitrary Langrarian Eulerian (ALE) in order to solve Navier Stokes Equation coupling with structure coupling of the accumulator.The usable of excessive material in designing the thickness of bore without knowing the optimum thickness for high pressure stored should be avoided. In this study, three dimensional (3D) models of the accumulator were designed and analyze using commercial CFD package ANSYS 14.0 coupling between ANSYS Fluent and ANSYS Static Structural in order to investigate effect of high pressure to the stress of the accumulator body. This study aims to find the optimum thickness to withstand the pressure in order to reduce the usage of highly cost material via FSI method. High pressure fluid will keep enclose inside the accumulator for different range of pressure value. It is ...