The editorial board announced this article has been retracted on February 23, 2020. If you have any further question, please contact us at: mer@ccsenet.org
{"title":"Design a Space Frame Chassis for Light Weight Automobiles for Improved Safety and Reliability","authors":"Chala Jembere Bulgu","doi":"10.5539/mer.v9n2p36","DOIUrl":"https://doi.org/10.5539/mer.v9n2p36","url":null,"abstract":"The editorial board announced this article has been retracted on February 23, 2020. \u0000\u0000If you have any further question, please contact us at: mer@ccsenet.org","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"17 1","pages":"36"},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73155182","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}
Kyle A. Baker, Eryn A. Culton, Joshua A. Ten Eyck, Zachary Lewis, Timothy A. Sands
Modification of rigid body angular momentum permits controlled rotational maneuvers, and one common momentum-exchange actuator contains challenging mathematical singularities that occur when the actuator geometrically aligns perpendicularly to the commanded torque direction. Substantial research has arisen toward singularity avoidance, singularity escape (when avoidance fails), and singularity penetration which permits safe flight through regions of singularity. The latter two in particular, singularity escape and penetration require mathematical calculations of singular and near-singular quantities (very large numbers) using constituent numbers that are sometimes very small. This dichotomy leads to interesting peculiarities in some specific geometries. This short communication critically evaluates three often spoke postulates for defining singularity and the axioms that accompany the postulates. Researchers using disparate postulates arrive at contradictory conclusions about singularities, and we examine these peculiarities, leading to a few conclusions. Singular conditions must never be declared in the abstract without consideration for the commanded maneuver (e.g. the claim “the CMG system is singular”). Seeking the true angular momentum capability at near-planar skew angles, this research concludes that performance prediction is difficult installations at low skew angles should be avoided whenever permissible to enhance abilities of mathematical calculations. It will be shown that maximum momentum performance is easily predicted at very high and very low skew angles, and performance will be shown to be lowest at mid-values of skew angle. Meanwhile, maximum singularity-free performance remains elusive at even modestly low skew-angles.
{"title":"Contradictory Postulates of Singularity","authors":"Kyle A. Baker, Eryn A. Culton, Joshua A. Ten Eyck, Zachary Lewis, Timothy A. Sands","doi":"10.5539/mer.v9n2p28","DOIUrl":"https://doi.org/10.5539/mer.v9n2p28","url":null,"abstract":"Modification of rigid body angular momentum permits controlled rotational maneuvers, and one common momentum-exchange actuator contains challenging mathematical singularities that occur when the actuator geometrically aligns perpendicularly to the commanded torque direction. Substantial research has arisen toward singularity avoidance, singularity escape (when avoidance fails), and singularity penetration which permits safe flight through regions of singularity. The latter two in particular, singularity escape and penetration require mathematical calculations of singular and near-singular quantities (very large numbers) using constituent numbers that are sometimes very small. This dichotomy leads to interesting peculiarities in some specific geometries. This short communication critically evaluates three often spoke postulates for defining singularity and the axioms that accompany the postulates. Researchers using disparate postulates arrive at contradictory conclusions about singularities, and we examine these peculiarities, leading to a few conclusions. Singular conditions must never be declared in the abstract without consideration for the commanded maneuver (e.g. the claim “the CMG system is singular”). Seeking the true angular momentum capability at near-planar skew angles, this research concludes that performance prediction is difficult installations at low skew angles should be avoided whenever permissible to enhance abilities of mathematical calculations. It will be shown that maximum momentum performance is easily predicted at very high and very low skew angles, and performance will be shown to be lowest at mid-values of skew angle. Meanwhile, maximum singularity-free performance remains elusive at even modestly low skew-angles.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"55 1","pages":"28"},"PeriodicalIF":0.0,"publicationDate":"2020-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90836062","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}
This paper analyzes the origin, status, changes and characteristics of the automotive electromechanical maintenance skills competition in China, and presents the developing trend in the future.
分析了中国汽车机电维修技能竞赛的起源、现状、变化和特点，并提出了今后的发展趋势。
{"title":"The Change and Prospect of “Automobile Electromechanical Maintenance Skills Competition” under the Chinese Model","authors":"Jia Feng","doi":"10.30564/jmer.v2i2.1123","DOIUrl":"https://doi.org/10.30564/jmer.v2i2.1123","url":null,"abstract":"This paper analyzes the origin, status, changes and characteristics of the automotive electromechanical maintenance skills competition in China, and presents the developing trend in the future.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88626391","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}
Article history Received: 4 June 2019 Accepted: 12 August 2019 Published Online: 30 November 2019 The thermal balance state of high-speed and heavy-load gear transmission system has an important influence on the performance and failure of gear transmission and the design of gear lubrication system. Excessive surface temperature of gear teeth is the main cause of gluing failure of gear contact surface. To investigate the gear heat distribution in meshing process and discuss the effect of thermal conduction on heat distribution,a finite element model of spur gear is presented in the paper which can represent general involute spur gears. And a simulation approach is use to calculate gear heat distribution in meshing process. By comparing with theoretical calculation, the correctness of the simulation method is verified, and the heat distribution of spur gear under the condition of heat conduction is further analyzed. The difference between the calculation results with heat conduction and without heat conduction is compared. The research has certain reference significance for dry gear hobbing and the same type of thermal-structural coupling analysis.
{"title":"Numerical Simulation of Gear Heat Distribution in Meshing Process Based on Thermal-structural Coupling","authors":"Peixiang Xu","doi":"10.30564/jmer.v2i2.725","DOIUrl":"https://doi.org/10.30564/jmer.v2i2.725","url":null,"abstract":"Article history Received: 4 June 2019 Accepted: 12 August 2019 Published Online: 30 November 2019 The thermal balance state of high-speed and heavy-load gear transmission system has an important influence on the performance and failure of gear transmission and the design of gear lubrication system. Excessive surface temperature of gear teeth is the main cause of gluing failure of gear contact surface. To investigate the gear heat distribution in meshing process and discuss the effect of thermal conduction on heat distribution,a finite element model of spur gear is presented in the paper which can represent general involute spur gears. And a simulation approach is use to calculate gear heat distribution in meshing process. By comparing with theoretical calculation, the correctness of the simulation method is verified, and the heat distribution of spur gear under the condition of heat conduction is further analyzed. The difference between the calculation results with heat conduction and without heat conduction is compared. The research has certain reference significance for dry gear hobbing and the same type of thermal-structural coupling analysis.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90969599","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}
Article history Received: 31 October 2019 Accepted: 5 November 2019 Published Online: 30 November 2019 The rapid development of China’s automobile industry has brought ever-increasing impact on resources, energy and environment, the energy-saving and new energy vehicles come into being accordingly. This article firstly systematically introduces the technical route of energy-saving and new energy vehicles of China, focusing on the key bottleneck problems arising from the construction process of current assessment system of the technical route for energy-saving and new energy vehicles, establishes the energy-saving and new energy vehicle business model assessment index system afterward based on the comparative analysis on energy-saving and new energy vehicle business assessment model and the full life cycle theory, and finally makes prospects and forecasts on vital problems of system boundary, dynamic optimization, simulation system of full life cycle assessment of energy-saving and new energy vehicle.
{"title":"Research on Ecological Assessment and Dynamic Optimization of Energy-saving and New Energy Vehicle Business Model Based on Full Life Cycle Theory","authors":"Chao Peipei, Chen Yisong, Yang Yanping","doi":"10.30564/jmer.v2i2.1363","DOIUrl":"https://doi.org/10.30564/jmer.v2i2.1363","url":null,"abstract":"Article history Received: 31 October 2019 Accepted: 5 November 2019 Published Online: 30 November 2019 The rapid development of China’s automobile industry has brought ever-increasing impact on resources, energy and environment, the energy-saving and new energy vehicles come into being accordingly. This article firstly systematically introduces the technical route of energy-saving and new energy vehicles of China, focusing on the key bottleneck problems arising from the construction process of current assessment system of the technical route for energy-saving and new energy vehicles, establishes the energy-saving and new energy vehicle business model assessment index system afterward based on the comparative analysis on energy-saving and new energy vehicle business assessment model and the full life cycle theory, and finally makes prospects and forecasts on vital problems of system boundary, dynamic optimization, simulation system of full life cycle assessment of energy-saving and new energy vehicle.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"13 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72478517","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}
T. Yukawa, S. Kumagai, Taiyo Fujisawa, Yoshiaki Oshida, Youichi Takeda, K. Hanahara
This paper describes a development of a new structural type of continuously variable transmission (CVT). We here propose a CVT with linkages and irreversible mechanisms which does not positively depend upon frictional conduction force between conduction components. In the proposed CVT, four lever-crank units are connected in parallel mechanically with the cranks at an input shaft, and the output shaft is also connected mechanically via an irreversible mechanism installed at the fulcrum of the lever. In the experiment, we confirm that the continuous control of gear ratios in real time by realizing high-precision control for expansion and contraction of the links using electric linear actuators. As a merit of the developed linkage type of CVT, it reduces power consumption, compared to other conventional CVTs.
{"title":"Analysis of a Continuously Variable Transmission in which Four-Bar Linkages Are Arranged in Parallel","authors":"T. Yukawa, S. Kumagai, Taiyo Fujisawa, Yoshiaki Oshida, Youichi Takeda, K. Hanahara","doi":"10.5539/mer.v9n2p20","DOIUrl":"https://doi.org/10.5539/mer.v9n2p20","url":null,"abstract":"This paper describes a development of a new structural type of continuously variable transmission (CVT). We here propose a CVT with linkages and irreversible mechanisms which does not positively depend upon frictional conduction force between conduction components. In the proposed CVT, four lever-crank units are connected in parallel mechanically with the cranks at an input shaft, and the output shaft is also connected mechanically via an irreversible mechanism installed at the fulcrum of the lever. In the experiment, we confirm that the continuous control of gear ratios in real time by realizing high-precision control for expansion and contraction of the links using electric linear actuators. As a merit of the developed linkage type of CVT, it reduces power consumption, compared to other conventional CVTs.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"9 1","pages":"20"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77502677","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}
Eye movements are vitally important for living, survival and vision. A basic model of the eye, including ocular muscles, is considered that may be essential for better understanding the optical and sensory apparatus involved in vision, perception, and processing and control machinery of human movement. A state space model based on Newton-Euler formulation of the dynamics of the head and the eyeballs is presented that can be integrated with the dynamics of the skeletal system. The formulation allows integration of Lyapunov stability, hypothesized feedback mechanisms and inverse dynamics in more comprehensive neural processing models. Neural networks involved in saccades, gazes and dynamics of specific injuries, diseases and defects can be included in this formulation. The development allows a better understanding of the vision system as well as the neural and physiological elements involved in perception and physical and mental skills. It is also relevant to the design of artificial eyes.
{"title":"Toward Dynamics, Stability and Processing of The Vision System","authors":"H. Hemami, V. Utkin","doi":"10.5539/mer.v9n2p1","DOIUrl":"https://doi.org/10.5539/mer.v9n2p1","url":null,"abstract":"Eye movements are vitally important for living, survival and vision. A basic model of the eye, including ocular muscles, is considered that may be essential for better understanding the optical and sensory apparatus involved in vision, perception, and processing and control machinery of human movement.\u0000A state space model based on Newton-Euler formulation of the dynamics of the head and the eyeballs is presented that can be integrated with the dynamics of the skeletal system. The formulation allows integration of\u0000Lyapunov stability, hypothesized feedback mechanisms and inverse dynamics in more comprehensive neural processing models. Neural networks involved in saccades, gazes and dynamics of specific injuries, diseases and defects can be included in this formulation. The development allows a better understanding of the vision system as well as the neural and physiological elements involved in perception and physical and mental skills. It is also relevant to the design of artificial eyes.","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":"39 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2019-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80529572","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}
Pub Date : 2019-09-18DOI: 10.26480/jmerd.04.2019.284.287
A. Kuok, M. Sundang, C. Sipaut
{"title":"PROSPECT OF WATER-BASED SOLUBLE COATING COMPOUNDS FOR BIOCIDE-FREE, SELF-POLISHING ANTI-FOULING PAINTS","authors":"A. Kuok, M. Sundang, C. Sipaut","doi":"10.26480/jmerd.04.2019.284.287","DOIUrl":"https://doi.org/10.26480/jmerd.04.2019.284.287","url":null,"abstract":"","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44088971","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}
Pub Date : 2019-09-12DOI: 10.26480/jmerd.04.2019.281.283
Maher Abdul Ameer, Ziyad Muhamed Sheet Hamid, Mohammed Ali Karim Najmaldin, Riyad Jassim Tilefih, A. Al-Khateeb
{"title":"COMPARISON STUDY OF HAMMERING PHENOMENON FOR HYDRAULIC SYSTEMS USING VARIOUS MATHEMATICAL APPROACHES","authors":"Maher Abdul Ameer, Ziyad Muhamed Sheet Hamid, Mohammed Ali Karim Najmaldin, Riyad Jassim Tilefih, A. Al-Khateeb","doi":"10.26480/jmerd.04.2019.281.283","DOIUrl":"https://doi.org/10.26480/jmerd.04.2019.281.283","url":null,"abstract":"","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49490353","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}
Pub Date : 2019-09-12DOI: 10.26480/jmerd.04.2019.272.276
M. Kassim
{"title":"EXPERIMENTAL INVESTIGATION INTO THE INFLUENCE OF POROUS MEDIA ON THE MIXED CONVECTION HEAT TRANSFER INDUCED INSIDE SECTOR-SHAPED CHANNEL","authors":"M. Kassim","doi":"10.26480/jmerd.04.2019.272.276","DOIUrl":"https://doi.org/10.26480/jmerd.04.2019.272.276","url":null,"abstract":"","PeriodicalId":16153,"journal":{"name":"Journal of Mechanical Engineering Research and Developments","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44873133","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}
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