Mohd Anas Mohd Sabri

Car Body and Chassis Development of UKM CARevo for Perodua Eco-Challenge 2011

This paper presents the development of the UKM Perodua Eco-Challenge vehicle, CARevo in terms of aesthetic design, novel fabrication of car body and superior chassis design. The objective of the competition was to develop a fuel efficient car which was competent to travel the longest distance using 0.5 liter of RON95 fuel with some rules and regulation verified by the Perodua to be followed. The UKM CARevo was powered by a 660cc fuel injection engine with manual 5-speed transmission with the total of 3450 mm, 1500 mm and 1106 mm for its length, wide and height. Several design such as space frame chassis design, composite bodywork result from fiberglass with resin, aerodynamic design of car body and are the key features that is discussed in this paper.

Development of Semi-Active Panel Design for Sound Absorption

Various noise-absorbing materials and apparatus were developed not only for industry purposes but also for increased personal convenience through the absorption of unwanted sound. Absorbing products are typically passive mediums, whereas active-control absorption is expensive and complicated to install. Thus, in this study, a semi-active panel design for the sound absorber is developed to ensure operation at a required absorption level for a particular environment and to allow manual control. This study focused on producing an optimum design from several blueprints by using the simulation program, WinFlag. Simulation results are validated by using the impedance tube method. The samples used are perforated plates with open areas of 5%, 7.5%, 10%, 12.5%, and 15%. The second layer is a 35-mm thick coconut coir fiber as the main absorbing material. The third layer is air cavity. Simulation results indicate that the panel with perforation plates with 15% open areas gained the highest peak of sound absorption coefficient (0.851) at 5000 Hz. By using 30 mm thick air cavities, the highest peak is 0.963 at 3129 Hz. Experimental results indicate that the highest peak of sound absorption coefficient is 0.847 for the 15% open area of perforated plates, whereas the highest peak is 0.934 when 30 mm thick air cavities are used. The same pattern in the overall results denotes that the experiment result agrees with that of the simulation

The Study of Thermal Comfort and Noise Level in Battery Plate Factory

The successful of manufacturing factories in industry is highly dependent on a productivity of their employees especially operators. It was identified that comfort and noise level can reduce the productivity of their workers. This study is to determine the level of thermal and noise comfort in the battery plate factory. This study was conducted in three days and location of the study is at battery plate factory in Semenyih, Selangor, Malaysia. The scope of study is focused at plate manufacturing area where the employee estimated 40 persons. The thermal comfort level can be determined by calculating PMV and PPD. This study involved six factors of comfort which is air temperature, average radiant temperature, air velocity, relative humidity, metabolic rate and clothes insulation. Then the study of noise level was conducted by determining LAeq, T, Lmax and Lmin. To carry out this study, Babuc-A equipment were used. The analysis show the area of the manufacturing battery plate having a discomfort condition and PMV result is between 1.5 until 3. Air temperature on the other hand is between 27.4°C-37.8°C while relative humidity is between range 35.35% -92.1% and air velocity 0 m/s-1.28 m/s. Meanwhile the LAeq,T value in the factory is varied from 68 to 80 dB.

Material Characterization by Using Non-Contact Ultrasonic Method

Non-destructive characterization of material is given more attention due to its advantages in cost of research, procedure of experiment, accuracy of results and time taken to undergo experiment. As compare to other non-destructive characterization method, non-contact ultrasonic method does not need physical contact with specimen, surface specimen no need special preparation, analysis of any stage of formation of specimen and non-hazardous.This study is to carry out the experiment of material characterization by using non-contact ultrasonic method. First, the grid on the specimen is identifying by plot the chart grid in 5x5 mm size grid. Next, ‘surfer’software will generate a contour map, specimenimage and wire-frame image for each specimen by using the data taken. According to the specimenimage and wire-frame image, the shape, position of the defects of specimen and the change of density of defects can be identified. The area of defects of specimen is calculated by using the mean value calculation method. The accuracy of calculation area of defects is calculated by comparing the area of defects by experimental and theoretical. The result of this study shows the accuracy of this study depend of the ratio of size of defects which is the area of defects and grid size which is the area of data be taken.

Monitoring system of fuel injector using piezoelectric sensors

The performance of a fuel injector greatly influences the performance of a vehicle engine. An effective monitoring system is capable of detecting damage, instability, and even the life of fuel injector. In this study, a test rig on fuel injector using piezoelectric film sensor has been developed. Three parameters, namely, pulse width at 5, 10, and 15 ms; frequency at 17, 20, and 25 Hz; and pressure at 10, 50, and 70 bar were used for observation. These parameters were set at different combinations to obtain the different injection patterns of the fuel injector. Statistical methods were used to analyze the data, with the aid of the Matlab software. The injection pattern was described using a new I-kaz (Ƶ) statistical parameter, which is intended to provide a simple explanation of the corresponding correlations between the coefficient of I-kaz and the statistical parameters, such as root mean square, Skewness, and Kurtosis, to obtain effective information on the operation state of the fuel injector. The results showed that higher pulse width results in a higher I-kaz coefficient, which also increases with an increase in frequency and varies with pressure; however, the pattern depends on the pulse width. The I-kaz scatter graph against skewness showed a clear pattern among the statistical parameters. The corresponding correlation was useful for monitoring the fuel injector and can be used as a reference for future studies.

Free Vibration of Tire Road Contact

In this paper, a simulation procedure for tread patch to the road under consideration of contact effects is introduced. In particular, the treadband has been treated as an infinite tensioned beam resting on an elastic foundation. A contact model specially suited for the contact pairing rubber and rough road is developed. The main objective is here to predict the vibration generated from a system mentioned above by locating harmonic point forces representing the exitation of treadband at the contact patch. The simulations are carried out by means of the Finite Element Method in a structure vibration of tire. Exemplary simulation results are presented for 3D models of tire tread block and road. This model can be used as a tire design guide for selecting parameters which produce the minimum noise radiation.