Nowadays an automotive industry steadily has been growing and playing a major role on economy development for many years. The crash box is one of the most important parts for safety but it was found that the crash boxes manufactured domestically are not met international standard requirements. This is due to process and material limitation. This process for automotive safety test requires high budget and there is unclear approach for specific test. Therefore a study of crash boxes referred to energy absorption project was conducted as the alternative materials for product. Consequently this project was aimed to design and test crash boxes which made from the diversity of the alternative materials such as aluminum aluminum reinforced by foam resin reinforced by fiberglass resin reinforced by water hyacinth and resin reinforced by water hyacinth and husk. In addition it was also emphasized in studying energy absorption behavior and physical deformation of crash boxes after dynamic and static energy being applied. The experimental works were applied for these tests in partly referenced to US NCAP and ECE R29 standard for automobile collision test. Testing all types of crash boxes indicated that the aluminum reinforced by foam type was able to absorb energy at 189 MJ/m3. It is higher than resin reinforced by water hyacinth and husk at 1 MJ/m3 as 188 times. Furthermore the comparison of the energy absorption (per unit volume) between the aluminum reinforced by foam type and the steel type from the previous project equivalent 20 MJ/m3 found that it is 8.45 times of difference. While the front impact test was not successful because the size of crash boxes was not suitable for the energy volume. It was a cause for non-available calculation of energy absorption value.

A disc brake is one of important auto parts for automotive industry which effected directly to life safety. The wear of brake rotor war affected to the brake efficiency. Lf the wear of rotor was discovered while operating the risk of accident shall be reduced. Therefore a study of disc wear affected to brake distance was the one of alternative for the brake efficiency testing. From this reason the aim of project is to test brake efficiency from the wear of brake rotor with the experiment conditions from JASO C 406 [1]. By the test conditions are focused on 3 cases of the wear: rotor little roughness rotor and abundant roughness rotor. The conditions of experiment consist of 100 200 และ 3000C on the rotor surface operating pressure 2 4 and 6 MPa initial speed before brake applied 50 and 80 km/hr. Based on the result of experiment was revealed that the braking distance deceleration and the brake ability with deceleration per unit of area. The result of experiment shown that the ordinary rotor at 6 MPa 300 0C and 50 km/hr. is given to the shortest of braking distance 69.7 m. Although the average of deceleration and the brake ability is take up on little roughness rotor. In case of the longest braking distance was occurred on the abundant roughness rotor. However from this study is discovered to the high temperature and the high pressure is significant to the braking distance shortened.

Braking system is the main of safety for motor vehicle. It uses to slow down or stop of vehicle movement. Normally braking system can not to adjustable in the recently. The brake efficiency depends up on to 3 factors by the perfection of brake equipment friction coefficient of road surface and the brake proportional. The factor of the perfection of brake equipment and friction coefficient of road surface can not be control. But in case of the brake proportional can be set up to suitable. In the other hand if the brake ratio is unsuitable the driver may be risk to danger from the loss of vehicle control. From this reason the aim of project is to study of the brake proportional affected to vehicle control. By the test condition consist of 2 cases: braking performance testing and vehicle stability testing. In case of braking performance testing is consider to deceleration braking distance and time of braking. For the vehicle stability testing is determined with yaw angle pitch angle sideslip angle and wheel lock up condition. However the bolt of testing is the road test and using the FMCSA standard for the testing guideline. The result of the braking performance testing shown the maximum deceleration was appeared on brake proportional 80:20. But the braking distance and time of braking are least because of the non-continuously of deceleration from the driver. Therefore the braking distance and time of braking depend on the continuously of deceleration. In term of vehicle stability testing discovered to the each of brake proportional are risk to danger for the driver especially on the 100:0 because of the value of sideslip angle is more than the critical point and the rear axle is lock up.

Sidecars are one kind of vehicles which Thai peoples widely use and also be useful in daily life such as a commercial carrying and transport carrying. the purpose of this project is to increase more safety of carrying and utilization by reserching and developing the stability of sidecars. This approach is to use the 3rd phases set of width adjustable (confirm with legality) is composed first series of small phases second series of midium phases and third series of large phases in order to find each phases of the differences in the stability of sidecars. At the same time this experimentation occured the Pitch angle the Yaw Angel the Resistance in riding and brake and finally the speed of sidecar. Many conclusions are to get the most suitable stability of sidecars. Based on this methodology will be the most suitable stability of sidecars which can develop and design sidecars get more efficiency and capability of carrying later. The result of the stability sidecars testing in case of no carrying was found that increase of wheeltrack directly effects the Yaw Angel increased and conversely Sideslip angle reduced. In case of carrying with passengers was found that the increase of mass directly effected on the increasingly resistance of left hand and right hand. In case of commercial carrying that was similar to the testing carrying with five passengers due to the weight distribution got near to front wheels similarly was found that the increase of wheels base directly effected on the Sideslip angle increased and conversely the Pitch angle reduced. In case of commercial carrying which reduced the speed while cornering directly effected on the Sideslip angle reduced. For the bend testing by braking with the rear brakes and 1.1 m wheel track caused the Pitch angle the Yaw Angle and the Sideslip angle was less was found that was the most suitable stability of sidecars. And conversely for the bend testing by braking with the front brakes or braking with the front and rear brakes jointly caused the Pitch angle the Yaw Angle and the Sideslip angle was more was found that is not insecurity to keep the suitable stability of sidecars.

This research intends to study the English language learning strategies of students in the faculty of Liberal Arts Rajamangala University of Technology Phra Nakhon and to compare the learning strategies among gender three fields of study and English language achievement. The population group is 215 second-year Liberal Arts students in the second semester of the academic year 2016. The instrument was the Strategy Inventory for Language Learning (SILL) questionnaire. The obtained data were analyzed to find percentage mean and standard deviation. The study findings revealed that the overall use of English language learning strategies was at the medium level (=3.19). When considering each strategy the highly used learning strategy was compensation learning strategies (=3.46) and followed by affective learning strategies (=3.36) metacognitive strategies (=3.15) social strategies (=3.13) memory strategies (=3.03) and cognitive strategies (=3.01) respectively. The result also indicated that the learners’ fields of study and English language achievement significantly affected the overall learning strategies but gender did not show significant differences.