จำนวน Repository ( 2131 )
แบบจำลองระบบควบคุมสั่งจ่ายการจ่ายไฟฟ้าแบบอัตโนมัติ
This project report proposes a Model of Command System for Automatic d by the device can be controlled automatic transmission. Using the computer Power Control. Generator as a second pass through devices various. And to analyze what is happening in the transmission line. Design and Create Model of Command System for Automatic Power Control This purpose Create Model of Command System for Automatic Power Control. In order to understand the transmission line. And cause occurring in the transmission line. Can be cut the voltage or current out of range immediately beyond the setting. Experiments will be power supply to model And connected to the load for the parameters In order to show the value of the program window That over or under the setting or not. By experiment will be test the effectiveness of the program That has performance any. From experimentation model of Command System for Automatic Power Control able to control the power supply according to demand.
การวิเคราะห์พฤติกรรมของวัสดุผสมภายใต้สภาวะอุณหภูมิต่างๆของผ้าเบรก
Brake system is used the friction between disk and pads. In the driving conditions the brake behavior from the driver is difference. Based on this reason the damage on disk and pads are occurring. Nowadays the ratio of compound materials in pads is several and involved automotive industry has not available enough to experiment. Thus it is difficult to brake pads damaged analyzing in several driving conditions. In this problem the mechanical property tester is main tool for experimenting. And test procedure based on the Brake lining and disc brake pads compressibility JIS D 4413 [7]. The experiment emphasizes on the flexibility behavior and internal energy by volume with 3 types of brake lining and pads. For the experiment focused on conditions by normal apply brake repeat apply brake and suddenly apply brake. The results revealed the normal apply brake condition the maximum and minimum of flexibility behavior was appeared on brake lining and pads type A and type C with testing temperature at 2000C. By the repeat and suddenly apply brake conditions the brake lining and pads type C and type A with 300C is given to the maximum and minimum flexibility behavior. In case of internal energy by volume the maximum and minimum energy was appeared on pads type C and B at the 300C of testing temperature. For the testing temperature at 200 and 4000C the pads type A and type B were got the maximum and minimum energy respectively. On the other hand at the high flexibility behavior is given to high internal energy at the high temperature of the apply brake condition.
การศึกษาพฤติกรรมการถ่ายเทความร้อนของจานเบรกด้วยระเบียบวิธีไฟไนต์เอลิเมนต์
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.
การศึกษาพฤติกรรมค่าการนำความร้อนของผ้าเบรกรถยนต์
Nowadays one of the automotive engineering is conductivity of brake pads playing a role in friction coefficient which means safety of customer. Thus thermal properties have been improved using composited materials. This project aims to study the conductivity behavior of 3 different brake pads which are supported by the company Compact International (1994) Ltd. For experimental works temperature based on brake condition was simulated from 200 to 400°C and cooled down from 400 to 200°C at 1 5 and 8 MPa of pressure respectively. By standard JIS D4413 testing condition of pressure was referred. The non-linear of conductivity value are calculated from the temperature under steady state condition. As a result of testing there are several of parameters effecting on the non-linear conductivity value. The brake pad that is a mix of high-fiber occurs the fluctuation of thermal conductivity. At the same time lubricant in the brake pad cause the stability of conductivity value in different temperature range at the same pressure. On the other hand the brake pad mixed hi-copper inspires the narrow range of conductivity value in different pressures at the same temperature. Moreover the conductivity value as a mention is inversely proportion with the coefficient of kinetic friction.
การพัฒนานวัตกรรมรูปแบบลวดลายทอและสีผ้าไหมนาโพธิ์ บุรีรัมย์
Mudmee silk and silk weaving are the long carried cultural wisdom heritages inherited from ancestors. Buriram is another province where weaves Thai silk especially in Na Pho district. Na Pho Silk Weaving Center (Na Pho Handicraft Center) has been known for madmee silk and silk weaving in quality standardization and popular. It is retaining traditional patterns and colors. New patterns are created but not much and not very suitable to produce various products. There is an attempt to revamp image of silk fabric and mudmee silk to raise value and use of color in universal design. The development for silk fabric designing and coloring in Na Pho received support for standardization. The design patterns has been inspired by mudmee silk’s ancient patterns Na Pho district Buriram province. The highlight of ancient patterns including Lai Khom Lai Tad Lai Song Pool Lai Khor Lai Eid Tong Lai Kra Tae Nang Tan or Lai Nak Lai Kho Pai and Lai Kho Lo (Butterfly) are applied in the process of assigning weaves/colors the size of the space and color placement for various patterns and application but it is still retaining the original pattern. Single color is applied for such patterns and become visible through its different including navy blue blue and bluepurple. Study of variation results in color fastness to washing color fastness to light color fastness to water and color fastness to perspiration of silk fabric and mudmee silk showed after dyeing. Color fastness to washing exhibited very good wash fastness level of (4-5) Color fastness to light exhibited excellent light fastness level of (5) Color fastness to perspiration (acid and alkaline) exhibited very good level of (4-5) and Color fastness of water exhibited moderate level of (4) The assessment reviews regarding patterns textures colors and products from silk fabric and mudmee silk from 20 samples of Na Pho Silk Weaving Center (Na Pho Handicraft Center) Na Pho district Buriram Province revealed that Pattern of silk fabric and mudmee silk of Na Pho Buriram province still retained pattern and exhibited excellent value of (75 percent) and good value of (25 percent). Pattern was contemporary between traditional motifs and new design exhibited excellent value of (50 percent) good value of (40 percent) and moderate value of (10 percent). Pattern was not difficult and not too easy. It was suitable to weave for silk fabric and mudmee silk exhibited excellent value of (85 percent) and good value of (15 percent). Pattern layout still retained the method of the traditional motifs exhibited excellent value of (60 percent) good value of (30 percent) and moderate value of (10 percent). Placement and spacing of patterns were balanced and not too tight exhibited excellent value of (70 percent) good value of (25 percent) and moderate value of (5 percent). The suitable of pattern layout in vertical horizontal diagonal and stripes which involved in the manufacture of textile products exhibited excellent value of (75 percent) good value of (20 percent) and moderate value of (5 percent). Color placement was harmonized and suitable for manufacture of textile products exhibited excellent value of (60 percent) good of (35 percent) and moderate value of (5 percent). Pattern become visible through its difference when dark color is applied for silk fabric and mudmee silk with exhibited excellent value of (65 percent) and good value of (35 percent). The suitable of apply single color and color which is similar to for the fashion and textile product exhibited excellent value (50 percent) good value (35 percent) and moderate value (15 percent). The application of the new pattern from the silk fabric and mudmee silk products exhibited contemporary with excellent value of (85 percent) good value of (10 percent) and moderate value of (15 percent). Bags products from using silk fabric and mudee silk maintained the same identity with excellent value of (70 percent) and good value of (30 percent). Textiles products from silk fabric and mudee silk Na Pho Buriram province exhibited excellent value of (60 percent) good value of (35 percent) and moderate value of (5 percent)