Admittedly a disc brake plays an important role in the auto part industry since it concerns directly with safety. Therefore the wide range of disc brake has been designed in order to develop its heat ventilation. There are two physical kinds of brakes: front-vented disc brake and backvented disc brake. As a result such difference affects directly to the heat ventilation which is a vital factor of the brake’s capability. The project team recognizes its importance and tries to create the test to find out the temperature diffusion of the disc brake with the hope to evaluate the coefficient of the heat convection varied by the temperature changing in both kinds of brakes under the forced heat convection in the steady condition. However the steady heat conduction and radiation value will not be counted because it is insignificant. The JASO C406: 2000 Standard is adopted as a guideline in the test. The outcome coefficient of heat conduction will be used in the simulation via the Finite Element Method (FEM) in order to study the temperature diffusion and heat ventilation of both kinds of brakes at each temperature level. Consequently the experimental work reveals then the heat convection coefficients of both kinds are unidirectional. The heat convection coefficient of the front-vented disc brake is 4.40 % in average higher than that of the back-vented disc brake. From the simulation the front-vented disc brake can ventilate the heat better than the back-vented disc brake at 3.02 % in average. It can be summarized that the front-vented disc brake has more temperature difference than the backvented disc brake. Hence the front-vented disc brake likely gets more stress from the temperature than the back-vented disc brake and might be damaged during the operation more than the another type.

Nowadays the automotive industry in Thailand has been widely growing. Brake pad is one of the automotive products that play a vital role in automotive industry because it is the most critical seeurity part. Consequently testing products for quality are extremely requested. However the precise equipment and function tests which show the real effects are not available enough and cost a lot. Therefore they cannot response to the deman in the automotive industry development. In this study the frictional test jigs for friction measurement JIS K7125 [5] and the clutch facings for automobiles JIS D4311 [6]. A study of the frictional test emphasizes on the static friction (μs) and kinetic friction (μk) in different condition. There are 3 specimens of brake pad supposted by the industry company. These specimens were tested and the results from the pin-ondisk and those from the friction testing were compared. The results revealed the correspondence of the two-sided results but the pin-on-disk’s friction coefficient is more than the friction testing’s friction coefficient by 19.56%. Moreover the coefficient of friction varies according to the temperature Besides the static friction (μs) is likely more than kinetic friction (μk) and tends to differ considerably under high pressure condition.

A disc brake is one of important auto parts for motorbike cycle industry which effected directly to life safety. As the result this project aims to test the performance of the disc brake in order to study the physical disc brake that effects to braking distance and to be an alternative for testing the brake disc. The braking performance tester was designed and created in the single dynamometer which was not over 10 Hp and the 17of inertia .70 kg. m. Referring to testing state of JASO T204:2001 standard this tester focused on testing the 3 different types of disc brake i.e. normal type grooving type and perforated type. The tested temperature was at normal state of the brake disc temperature (60° C - 80° C) and at high state (more than 100° C). The braking force from 9.81 N to 34.33 N at master cylinder was tested. moments was not over 92 The result revealed that at normal temperature the braking performance of the three disc brakes (normal type grooving type and perforated type) was at 17.76 21.80 and 19.00 per 1 mrespectively. However the brake performance at high temperature was at 14.41 18.06 and 18.93 per 1 m. This meant that the most efficient disc brake at normal temperature was grooving type of disc brake which was 22.74% different from normal type of disc brake. Nevertheless; the perforated type of disc brake was the most performance disc brake at high temperature which was different from normal type of disc brake at 25.32% 2 of contact surface areas 2 of contact surface areas respectively2m/s2m/s

This thesis presents the design and construction of an experiments of the power flow in the power systems. For the operating system of the power flow in the power systems. Comprise with the real power Reactive power Voltage in the power system. To guide the planning and operation of power systems. The results of the experiment to calculate the pressure at various points in the Power loss of system. As well as finding solutions to problems. Occurring in the system such as under voltage or short circuit in the system. This is the basic of stability analysis of power system operation and planning

The aim of this project is to study the fuel consumption from the effect of tire pressure and tray volume. In order to tire pressure is consist of 2 conditions by: Road test and Roller test Bench. Their test is classified by 3 cases: standard tire pressure lower standard tire pressure and upper standard tire pressure. Furthermore the lower and upper standard tire pressure was compared with standard tire pressure. In case of seal and unseal of the tray volume was test with 2 postulates by Road test and water tunnel (model). The results of experiment with 3 cases of tire pressure found that the lower standard tire pressure (25/37 psi) given to the maximum fuel consumption when compare with standard tire pressure 4.6%. While the minimum fuel consumption is upper standard tire pressure (33/45 psi) or 1.29%. Furthermore the trend of those conditions was in the same direction. For the result of test in term of seal and unseal of the tray volume discovered to the fuel consumption in case of seal is lower than unseal of the tray volume 1.63%. And the result of test of the water tunnel has been the same direction with the Road test.