Applied Mechanics and Materials Vol. 372

Abstract: Entertainment establishments generally have a high volume of visitors and must pay special attention to enhance fire prevention and safety. In the past 30 years, many cases of serious fires have occurred in entertainment establishments in Taiwan, causing numerous casualties and significant property losses. Examples include the fire incidents at the Welcome Restaurant in Taichung City (64 people were dead) and at the Lunch in Restaurant and the Mythology World KTV in Taipei City (33 people were dead). Consequently, fire protection engineering research for entertainment establishments is extremely important. In this study, a specific bar-type entertainment establishment located in Taichung in 2011 was used as the research subject (9 people were dead).Field model-based fire dynamics simulator (FDS) software was used to reconstruct a numerical model for conducting a case study of the fire scene. Changes in the heat transfer, smoke flow, upper layer temperature, and CO concentration were investigated. This study also verified the fire field the evacuation of people. It is hoped that the results can provide a useful reference for fireproofing or prevention projects in similar entertainment establishments.

Abstract: This paper investigates the planning of the workshop logistics distribution system for an assembly line in an engineering machinery manufacturing company producing mainly concrete mixer trucks. The study covers mainly some methodologies in selecting appropriate logistics distribution mode, determining the distribution lot size and part-sets, and deciding the material packing method under some distribution batching rules. The simulation software QUEST is employed for carrying out some systematic simulation experiments and analysis, so as for finding an ideal logistics distribution scheme and improving the performance of the production logistics system.

Abstract: With regard to the disadvantages in maintenance support of fire control system , such as single function, poor versatility, low in test efficiency as well as poor reliability, a fault diagnostic test equipment is developed based on Fault Tree Analysis (FTA) and expert system. The fault tree is constructed with the failure of fire control system as top event. Then the qualitative analysis of fault tree is performed. The embedded equipment and industrial processing computer (IPC) are used in the design of hardware which is based on modular concept. The software of fault test equipment is modular and open-source and developed by LabWindows/CVI. In addition, if consists of multiple modules, such as system test, fault diagnosis, data management, self-test and others. Database platform of Oracle and expert system are combined in the storage of test and diagnosis result as well as the inference and troubleshooting of system fault. This work indicates that FTA is an effective mean in fire control system fault diagnostic equipment.

Abstract: The bonded particle model (BPM) of granite for pre-stressed machining is build by using the discrete element method (DEM). This model can not only descript the intergranular fracture behavior but also the transgranular fracture behavior of the granite. The processes of crack propagation under different pre-stressed machining conditions are studied by means of DEM simulation. Damages and cracks of surface/subsurface are also observed. The simulation results show that, while the magnitude of pre-stress is controlled in a certatin range, the number of radial cracks reduce as the increasing of pre-stress magnitude, contray to the transverse cracks. It could be seen that maching damage is decreased and surface quality is improved by applying the pre-stressed machining method, and the discrete element method is an effective way to simulate the machining process of granite.

Abstract: Road roughness is a broad term that incorporates everything from potholes and cracks to the random deviations that exist in a profile. To build a roughness index, road irregularities need to be measured first. Existing methods of gauging the roughness are based either on visual inspections or using one of a limited number of instrumented vehicles that can take physical measurements of the road irregularities. This paper presents used a quarter car model (passive suspension System in 206 Peugeot) in according road classification ISO 2631-1 is achieved road roughness interval in form of optimization method Gamma (4p) distribution as PSD function in different constant speed of car (34, 70 and 100 Km/h) by using Matlab Code. Finally, to have accurate results and to describe effect of vehicle velocity on irregularity surfaces incoming Automotive Suspension System, are compared road roughness in terms of travel length and PSD function in terms of Frequency Hz. Keyword: Road Roughness, PSD function, Vehicle Velocity, Gamma (4p) distribution.

Abstract: Travel by air with long hours will create discomfort feeling for aircraft passenger especially economy class aircraft passenger. Long hour air travel will create physiological stress on aircraft passenger. It may due to seat space limitation, noise, vibration, cabin humidity as well as seat comfort. Seat comfort is a subjective feeling that related to psychological aspect of aircraft passenger. The current aircraft passenger seat is equipped with a passive function where the passenger themselves needs to adjust the seat for comfort seating position. The aircraft passenger will not able to adjust the seat when the aircraft passenger is in the low activity condition. The active seat support system was developed to support the aircraft passenger actively. The first prototype of active seat support system is focus on neck section. The head position of the aircraft seat was embedded with the system to detect the head position of the passenger. During the development of the active seat support system, total design technique was used. Five conceptual designs were generated for selection. To determine the final design of active neck support system, the matrix evaluation method was used. The weight of the concept was obtained through weight analysis.

Abstract: The bending beam of railway vehicle is made of thin stainless steel, with large sizes and unsymmetrical section, and prone to defects during stretch-bending forming process, such as wrinkling, cross-section distortion and so on. A reasonable trajectory of gripper jaws could make for mitigating the mentioned defects. The Finite Element Method was employed to fit the trajectory as well as simulate the forming process. The FE model was built by using the commercial FE software Hypermesh and ABAQUS/CAE. The analysis was carried out based on dynamic explicit and displacement control method. On this basis, the actual stretch bending process was developed according to the fitted trajectory and simulated process. The actual production process indicates that the formed beam can meet the design requirements, and the method is feasible and economical, as well as can contribute to a better understanding of stretch bending process and die design.