EPI International Journal of Engineering最新文献_第9页

Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model 基于不对称绳系模型的拖船在波浪中的升沉和俯仰运动

EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/epi-ije.022019.07

A. Fitriadhy, N. A. Mansor, N. A. Aldin

{"title":"Heave and Pitch Motions of a Towed Ship in Waves Incorporated with an Asymmetrical Bridle Towline Model","authors":"A. Fitriadhy, N. A. Mansor, N. A. Aldin","doi":"10.25042/epi-ije.022019.07","DOIUrl":"https://doi.org/10.25042/epi-ije.022019.07","url":null,"abstract":"Investigation of a ship towing system performance in waves incorporated with an asymmetrical towline configuration is necessarily to be studied to ensure a towing safety of navigation. To achieve the objective, this paper presents the ship towing motion performance in waves using Computational Fluid Dynamic (CFD) approach. Here, the heave and pitch motions of the towed ship so-called barge has been analysed, where several effects of the towing angle and towing speeds have been taken into account. In the calm water condition, the results revealed that the increase of tow angle was proportional with the sufficient reduction of the sway amplitude motion and inversely proportional to her yaw motion. The increase of the asymmetrical tow angle, however, has led to increase her sway motion amplitude in wave condition and conversely reduced the tow speed increased. In addition to the pitch motion characteristic, it subsequently increased by 12.1% as the tow angle raised from 25° to 35°; meanwhile the pitch motion of barge has by 10.2% as the tow speed increased from 0.655 m/s to 0.728 m/s. This CFD simulation is very useful as the preliminary prediction on the heave and pitch motion characteristics ensure a safety navigation of a towed ship in waves.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124818021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Experimental Study of the Use of Pumice Sand in the Rigid Pavement 浮石砂在刚性路面中的应用试验研究

EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.11

A. Gaus, I. Imran, C. Anwar, Liska Novianti

{"title":"Experimental Study of the Use of Pumice Sand in the Rigid Pavement","authors":"A. Gaus, I. Imran, C. Anwar, Liska Novianti","doi":"10.25042/EPI-IJE.022019.11","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.11","url":null,"abstract":"The Pumice sand is a bright colored butian type, containing foam made from glass-walled bubbles and usually referred to as silicate volcanic glass granules. This pumice sand can be used as a substitute for normal sand as fine aggregate in a mixture of concrete mix. Based on the characteristic test examination, it can be seen that in testing the characteristics of pumice sand to the specifications of normal sand in specific gravity testing and weight testing of quicksand obtained results that are smaller than the specifications of normal sand and absorption tests obtained results greater than specifications on normal sand. The results of the normal sand compressive strength at BN is 250.95 kg /cm2 while the results of the floating sand concrete compressive strength on BPA is 224, 965 kg /cm2. Based on the research it can be concluded that with the same quality of concrete, the quality of K-250 is different in comparison to the compressive strength of concrete in normal sand and pumice sand concrete shows almost the same results. Therefore, more in-depth research is needed regarding the use of pumice sand instead of normal sand in a mixture of concrete mix","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132160194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Temperature Control of Soft Drinks on Vehicle with Portable Storage Thermoelectric Cooler 便携式储藏式热电冷却器对车载软饮料温度控制的研究

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.07

Basri Basri, M. Mustofa, D. Patabang, Y. Rahman, W. H. Piarah

引用次数: 2

Vibration Analysis of Cracked Structures as a Roving Body Passes a Crack Using the Rayleigh-Ritz Method 用瑞利-里兹法分析粗纱体通过裂纹时裂纹结构的振动

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.04

S. Ilanko, Y. Mochida, Julian De Los Rois

引用次数: 2

Improved Performance of Silicon Rubber Insulation With Coal Fly Ash Micro Filler 粉煤灰微填料改善硅橡胶绝缘材料性能

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.13

T. Waris, Y. Murakami, N. Hozumi, T. Kawashima, S. Manjang, I. Kitta

引用次数: 2

Experimental Study on Thermal Performance of Loop Heat Pipe with Flat-Rectangular Evaporator Under Gravity Assisted Condition 重力辅助条件下平板矩形蒸发器环路热管热性能实验研究

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.06

Hien Phuoc Huynh, Htoo Zin Kyaw, K. Kariya, A. Miyara

{"title":"Experimental Study on Thermal Performance of Loop Heat Pipe with Flat-Rectangular Evaporator Under Gravity Assisted Condition","authors":"Hien Phuoc Huynh, Htoo Zin Kyaw, K. Kariya, A. Miyara","doi":"10.25042/EPI-IJE.082018.06","DOIUrl":"https://doi.org/10.25042/EPI-IJE.082018.06","url":null,"abstract":"In company with extreme developments of electronic devices, there are some unavoidable challenges to the conventional cooling methods such as high heat dissipation, limitation of cooling space, reliable operation as well as saving energy consumption. Therefore, the necessity of studying on new or how to improve the existing technologies is undoubted. Among various methodologies, the loop heat pipe (LHP) whose operation principle base on phase changing process, can be considered as one of the potential solutions of modern electronics cooling. This paper introduces the experimental investigation on the thermal performance of a flat-rectangular evaporator LHP with sintered stainless-steel wick when functioning under gravity assisted condition. Working fluid of this LHP was water. The present LHP could maintain stable operation in the range of heating power from 50 W to 520 W and keep the temperature on the heater’s top surface at 85oC, commonly recommended as the limitation temperature of electronics, when heating power reaches value 350 W (129.6 kW/m2). Besides, when turning the heater off, it took about 15 minutes for the LHP to cool the heating block from 102oC to 37oC. In addition, an assumption of the boiling heat transfer is introduced in this paper to explain the performance of evaporator at different heat flux conditions of the experiment. ","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133533045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Moment of Inertia of Attached Mass on Natural Frequencies of Cantilevered Symmetrically Laminated Plates 附加质量转动惯量对悬臂对称层合板固有频率的影响

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.05

K. Hosokawa

{"title":"Effect of Moment of Inertia of Attached Mass on Natural Frequencies of Cantilevered Symmetrically Laminated Plates","authors":"K. Hosokawa","doi":"10.25042/EPI-IJE.082018.05","DOIUrl":"https://doi.org/10.25042/EPI-IJE.082018.05","url":null,"abstract":"Since composite materials such as laminated composite plates have high specific strength and high structural efficiency, they have been usedin many structural applications. It is therefore very important to make clear the vibration characteristics of the laminated plates for the designand the structural analysis. Especially, the vibration characteristics of the laminated plates with attached mass are essential. However, wecannot find the theoretical or experimental approaches for the free vibration of laminated plates with attached mass. In the present study, theexperimental and numerical approaches are applied to the free vibration of cantilevered symmetrically laminated plates with attached mass.First, by applying the experimental modal analysis technique to the cantilevered symmetrically laminated plates with attached mass, thenatural frequencies and mode shapes of the plates are obtained. Next, the natural frequencies and mode shapes of the cantileveredsymmetrically laminated plates with attached mass are calculated by Finite Element Method (FEM). Finally, from the experimental andnumerical results, the effect of the moment of inertia of the attached mass to the natural frequencies and mode shapes of the cantileveredsymmetrically laminated plates are clarified.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123807395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

History of Mitigating Rolling Contact Fatigue and Corrugation of Railway Rails in Japan - Review 减轻日本铁路轨道滚动接触疲劳和波纹的历史回顾

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/epi-ije.082018.02

M. Ishida

{"title":"History of Mitigating Rolling Contact Fatigue and Corrugation of Railway Rails in Japan - Review","authors":"M. Ishida","doi":"10.25042/epi-ije.082018.02","DOIUrl":"https://doi.org/10.25042/epi-ije.082018.02","url":null,"abstract":"Rail is the one of the most important materials to support and guide railway vehicles safely and smoothly. Since rail suffers from variousinteracting forces and environmental atmosphere, wear and fatigue pose large problems with wheel and rail. Hence, wear and fatigue ofwheel and rail have been studied so far to keep running safety and some level of riding comfort of vehicle taking into account trackmaintenance cost in the world. In this review, the history of theory and practice of rail maintenance in Japanese railways is describedfocusing on rolling contact fatigue (RCF) corrugation of rails caused by dynamic rolling friction at wheel/rail interface. In particular, “squat”mainly callled in UK or “rail surface shelling” called in Japan which is one of typical fatigue phenomenon for steel wheel-on-rail system andrail corrugations caused by dynamic lateral friction and vertical loading at sharp curves and/or long wavelength of rail corrugation causedby longitudinal roll-slip or stick-slip excited by the resonance of unsprung mass of bogie vertical vibration supported by track stiffness. Inaddition, the practice of countermeasure for RCF defect of squat, preventive grinding, and countermeasure for top of low rail corrugation,top of low rail lubrication “Friction Moderating System” are described. Also, the possibility of preventing long wavelength of rail corrugationformed in tangential track in undersea tunnel (salty water) enviornment is described.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124800546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Maneuver Control System for Collision Avoidance Based On Experimental Study 基于实验研究的避碰机动控制系统

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.10

Kusnindar Priohutomo, A. Masroeri, Chandra Permana

引用次数: 1

Approximating Bending Stiffness for Structural Optimization of Double-skin Hollowed Car Body Panels 双蒙皮中空车身板结构优化的近似弯曲刚度

EPI International Journal of Engineering Pub Date : 2018-11-20 DOI: 10.25042/EPI-IJE.082018.03

Y. Ohta

引用次数: 0