วารสารวิชาการเทคโนโลยีอุตสาหกรรม (J. Ind. Tech.) อยู่ในฐานข้อมูล Thai-Journal Citation Index Centre (TCI) กลุ่ม 1 (2564 - 2567) และ Asean Citation Index (ACI) มีค่า JIF = 0.094 และ T-JIF (3 ปีย้อนหลัง): 0.165 | The Journal of Industrial Technology (J. Ind. Tech.) is indexed in Thai-Journal Citation Index Centre (TCI) Tier 1 (2021 - 2024) and Asean Citation Index (ACI) with impact factor, T-JIF: 0.094 and 3-years T-JIF: 0.165

บทความ

An Experimental Study of Performances and Emissions in a Small Fishery Boat s Engines Fuelled with Biodiesel B 5 and B 20

วิศวกรรมเครื่องกล

Energy and environmental crisis has leaded to many alternative eco-energy researches world widely. This research has surveyed small fishery boat populations which are incessantly affected by the fuel price. Researcher focused only on the 6-cylinder diesel engines which had higher fuel consumption. The result found that HINO engines were typically used. Consequently, the experiment was conducted on a 6-cylinder HINO diesel engine fuelled with biodiesel B 5 and B 20. The tested fuels in this research were certified by Department of Energy Business. The results show that biodiesel B 20 give lower torque, power and efficiency than that of biodiesel B 5 by 2.12%, 2.40% and 2.38% respectively. However, biodiesel B20 shows very apparent advantages in term of CO, HC, NOx and PM emissions. The reductions are 36.92%, 11.76%, 19.71% and 3.86% respectively. The result reveals that biodiesel B20 has a compatible potential to biodiesel B 5 and can be consider as one of the environmental friendly alternative fuel.

An Experimental Study of Performances in a Large Diesel Engine Fuelled with Diesel and LNG

วิศวกรรมเครื่องกล

According to the increase of energy demand and environmental crisis, natural gas has been studied and considered as one of the clean alternative fuels. However, knocking phenomena is unavoidable when large diesel engines operate with natural gas. This research aimed to investigate a large diesel engine fuelled with diesel – natural gas dual fuel system. Firstly, two natural gas vaporizers were tested to find the appropriate one. Then, a comparative experimental between diesel operation and dual-fuel operation was conducted. Output performance was considered and found that vaporizer with 3.8-metre internal length heat exchanger was more advantageous. Thus, this vaporizer was installed in the tested engine. The experiment was done over the speed range between 1,100 to 2,000 rpm. It was found that dual-fuel engine produced less torque and power than those of diesel engine around 2.10%, which was still acceptable in actual application. The result found that the amount of injected natural gas must be controlled as a function of engine speed to avoid engine knocking. Averagely, the natural gas was injected into the system around 71.32%. This leaded to the reduction of engine volumetric and thermal efficiencies around 2.73% and 3.5% respectively.

Assessment of Wind Energy Potential in Thailand Based on Using the Multiple-Weibull Distribution

วิศวกรรมเครื่องกล

Wind energy potential analysis is a design key to maximize wind turbine efficiency and annual energy output. Typically, the annual wind speed frequency is represented by a Single-Weibull distribution curve in spite of strong and calm wind patterns could occur through a year in many regions in the world, Thailand for instance. For this reason, wind energy potential should be analyzed by Multiple-Weibull distribution curves which are the representative of the meteorological seasons due to the monsoon’s effect. Therefore the objective of this study is to compare the accuracy of the Single-Weibull distribution and the Multiple-Weibull distribution in assessment of wind energy potential. The comparison was made between these two statistical distribution functions and the actual wind speed distribution (measured wind speed frequency) in order to determine the level of credibility of these two distribution functions. The wind speed data employed in this study was measured at Lamtakhong dam site in Nakhon Ratchasima province, Thailand. As the results, the error between the Single-Weibull distribution was 16.46% where the error between the Multiple-Weibull distribution was 14.82%, it was revealed that the smaller error, the higher reliability. Two of the most widely used wind turbines (Enercon E-30 and Windspot) were selected to verify the Multiple-Weibull concept. Approximately 40% increase in annual energy yield by using this method. So, the results confirmed that the Multiple-Weibull distribution is valid for the assessment of the annual energy production of wind turbines. Therefore, this will be a practical method for achieving the optimal design of stall-regulated wind turbine in the further work.

Friction Stir Welding of Dissimilar Joint of Aluminum Semi-Solid Metal Between SSM 356 and SSM 6061

วิศวกรรมเครื่องกล

The objective of this research is to investigate the effect of parameters on the microstructure and mechanical properties of friction stir welded butt joints of dissimilar aluminum alloy sheets between Semi-Solid Metal (SSM) 356 and 6061. The base metal of SSM 356 and 6061 was located on the advancing side and on the retreating side, respectively. The cylindrical pin was used as the welding tool geometry. Friction stir welded using different tool rotation speed (710, 1000 and 1400 rpm) and welding speed (80, 112 and 160 mm/min). The rotation speed and welding speed have a direct weld with the structure and mechanical properties of the weld. The results showed that metallurgy structure of stir zone resolution than base metal. Achieve distorted shape of the grain due to rotation speed for advancing side and retreating side. The maximum average hardness of 61.9 HV at tool rotation speed 1000 rpm, welding speed 112 mm/min. Hardness in the stir zone is higher than other areas, and will be reduced until the area thermo mechanical affected zone after that hardness is up to hardness of base metal and rotation speed 1400 rpm, welding speed 112 mm/min contributing to provide the maximum average tensile strength of 175.40 MPa

Optimization of Metal Inert Gas Pulse Brazing Process on Galvanized Steel Sheets Based on Taguchi Method

วิศวกรรมเครื่องกล

The purpose of this research was to identify the optimal conditions of the galvanized steel sheets based on the Metal inert gas pulse brazing process (MIGPBP). The study used the Taguchi method to experimentally design the L25 orthogonal array, including five main parameters: 1) wire feed speed, 2) arc voltage, 3) travel speed, 4) peak current, and 5) pulse frequency. Each of these parameters consisted of 5 levels, and thus the experiment runs 25 times with 3 replications (75 experiments in total) to find the characteristics of the MIGPBP that were considered important parameters and were exhibited significantly, including: 1) zinc coated balance of joint (ZB), 2) area for penetration of filler metal into the fit-up (ARP), and 3) tensile shear strength (TSS). The results demonstrated that the optimum conditions of the MIGPBP of galvanized steel sheets for the ARP and TSS were 4 meter/minute wire feed speed, 18 V arc voltages; 0.6 meter/minute travel speed, 450 ampere peak current and 35 Hz pulse frequency. For the ZB, the finding indicated the wire feed speed at 3.25 m/min, the arc voltages at 18 V, the travel speed at 0.9 m/min, the peak current at 425 A, and the pulse frequency at 35 Hz to be such optimal conditions which effected the quality of zinc coated balance of joint.

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