Global Journal of Researches in Engineering最新文献

Calculation of Time-Varying Mesh Stiffness of Internal Gears based on Precise Tooth Profile and Dynamic Analysis of Planetary Systems with Root Cracks 基于精确齿形的内齿轮时变啮合刚度计算和有齿根裂纹的行星系统动态分析

Global Journal of Researches in Engineering Pub Date : 2024-03-27 DOI: 10.34257/gjreavol24is1pg29

Dongjiang Cao, Fengwei Qin, Lisong Cao, Chang Hongjjie

{"title":"Calculation of Time-Varying Mesh Stiffness of Internal Gears based on Precise Tooth Profile and Dynamic Analysis of Planetary Systems with Root Cracks","authors":"Dongjiang Cao, Fengwei Qin, Lisong Cao, Chang Hongjjie","doi":"10.34257/gjreavol24is1pg29","DOIUrl":"https://doi.org/10.34257/gjreavol24is1pg29","url":null,"abstract":"The internal meshing spur gear pair is the research object, and the potential energy method is applied to calculate the time-varying meshing stiffness of the internal gear. The internal gear tooth profile is divided into two parts: involute and transition curves, and the gear tooth stiffness is calculated by numerical integration based on accurate tooth profile, which improves the calculation accuracy. Analyzed the influence of different crack size parameters on the stiffness of internal meshing gears. A coupled dynamic model of a planetary system with internal gear crack faults was established, and the influence of cracks on the dynamic response of the planetary system was studied using Zoom-FFT spectrum and cepstrum analysis methods. The simulation results show that as the crack parameter size increases, the mesh stiffness of the internal gear pair gradually weakens, and the periodic vibration impact of the planetary-internal gear pair is also more severe. Cepstrum analysis can easily capture weak fault characteristic frequency information in the system and discover their variation patterns. The research results can provide a theoretical basis for the state monitoring and fault diagnosis of gear systems with crack defects.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"69 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140376695","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

A Survey on Methods to Optimize Power Harvesting in Drones 无人机电能收集优化方法调查

Global Journal of Researches in Engineering Pub Date : 2024-03-27 DOI: 10.34257/gjreavol24is1pg21

Dr. Fath Elrahman Ismaeal Ahmed, Gihad Abdelaziz Abdelghani Ibrahim, Khalil.B. Ahmed. A, Hajir Saeed, Suhail Kamil

引用次数: 0

Hydrogen for Mobility: A Pathway to a Zero Carbon Transportation System 氢能交通：实现零碳交通系统的途径

Global Journal of Researches in Engineering Pub Date : 2024-03-27 DOI: 10.34257/gjreavol24is1pg1

Marc Abbott

{"title":"Hydrogen for Mobility: A Pathway to a Zero Carbon Transportation System","authors":"Marc Abbott","doi":"10.34257/gjreavol24is1pg1","DOIUrl":"https://doi.org/10.34257/gjreavol24is1pg1","url":null,"abstract":"Eliminating hydrocarbon transportation must be a fundamental goal for society if we are to negate Climate Change and its consequences. No source of CO2 emissions comes close to that of hydrocarbon fueled internal combustion engines and if we are to transition to a zero-carbon energy system, a viable alternative to hydrocarbon fuels must be found. Lithium-Ion powered vehicles or EV’s present society with a paradox, they emit zero emissions however the life cycle of Lithium-Ion batteries is a source of environmental concern through mining, deforestation of carbon sinks, the immense electrification requirements for battery production, recycling, and recharging.\u0000This communication proposes Hydrogen for Mobility as the future fuel for a pathway to a Zero Carbon Transportation System through utilizing both the existing internal combustion engine (ICE) and most existing transportation infrastructure, at the same time being cost effective, efficient and zero emitting. An overview of technologies will be discussed along with their Technology Readiness, benefits, and issues. This discussion expands on the concepts discussed in ‘Mobile Modular Hydrogen Power Generation – a Zero Carbon Energy System’. https://doi.org/10.5296/ijgs.v7i1.xxxx","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"97 36","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140377469","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

Optimizing Smart Factories: A Data-Driven Approach 优化智能工厂：数据驱动法

Global Journal of Researches in Engineering Pub Date : 2024-01-10 DOI: 10.34257/gjregvol23is3pg15

Janne Heilala, Antti Salminen, Wallace Moreira Bessa, Jussi Kantola

引用次数: 0

Systems Energodynamic Approach as an Instrument of Increasing Efficiency of Engineering Developments 系统能源动力法作为提高工程开发效率的工具

Global Journal of Researches in Engineering Pub Date : 2024-01-10 DOI: 10.34257/gjregvol23is3pg1

I. N. Dorokhov, Doc. V. Etkin

引用次数: 0

Developing Kruger Shalati: The Train on the Bridge 发展克鲁格-沙拉提桥上的火车

Global Journal of Researches in Engineering Pub Date : 2024-01-05 DOI: 10.34257/gjreevol23is4pg1

Gert Noordzy, Richard Whitfield, Li-Chun Lin, Tshepo Makhudu

引用次数: 0

Modeling of CO Oxidation by Diffusion of Oxygen Atoms in Ceria-Zirconia Particulates in a Three-Way Catalyst Particle Membrane Filter 三向催化剂微粒膜过滤器中氧化铈-氧化锆微粒中氧原子扩散的 CO 氧化模拟

Global Journal of Researches in Engineering Pub Date : 2023-11-27 DOI: 10.34257/gjrecvol23is1pg33

P. Koko, Katsunori Hanamura

引用次数: 0

In vestigation the Impact of Silicon Film Thickness on FDSOI and PDSOI MOSFET Characteristics 研究了硅膜厚度对FDSOI和PDSOI MOSFET特性的影响

Global Journal of Researches in Engineering Pub Date : 2023-08-12 DOI: 10.34257/gjrefvol23is2pg1

Towhid A. Chowdhury

引用次数: 0

Evaluating the Risk of Injury for Aircraft Attendants using Virtual Reality and Advanced Motion Tracking System Integrated with Ergonomics Analysis 基于虚拟现实和先进运动跟踪系统与人体工程学分析相结合的空乘人员受伤风险评估

Global Journal of Researches in Engineering Pub Date : 2023-06-29 DOI: 10.34257/gjregvol23is2pg1

Xiaoxu Ji, Ethan Swierski, Maria Arenas, R. O. Hettiarachchige, Xin Gao, Jizhou Tong

{"title":"Evaluating the Risk of Injury for Aircraft Attendants using Virtual Reality and Advanced Motion Tracking System Integrated with Ergonomics Analysis","authors":"Xiaoxu Ji, Ethan Swierski, Maria Arenas, R. O. Hettiarachchige, Xin Gao, Jizhou Tong","doi":"10.34257/gjregvol23is2pg1","DOIUrl":"https://doi.org/10.34257/gjregvol23is2pg1","url":null,"abstract":"Aircraft attendants are at a high risk of occupational injuries and illnesses, leading to substantial compensation costs and staff shortages in the aviation industry. To address this issue, this study introduces an innovative virtual reality technique and advanced motion tracking system integrated with ergonomics tools to effectively evaluate the risk of musculoskeletal disorders (MSDs) among aircraft attendants during their routine tasks. The study involved twenty-two participants who performed two common tasks: opening/closing the passenger door,and lifting luggage from the floor and placing it into the overhead compartment. The inappropriate postures were identified, which resulted in excessive strain on the participants’ lower back. By analyzing the impact of biomechanical variables, such as object weight, body height, and trunk motion, on the lower back, the study provides valuable insights that can inform the development of safety training programs and real-time monitoring approaches for injury prevention. Additionally, this innovative technology can be applied to other occupational fields.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131477149","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

From Gaussian Distribution to Weibull Distribution 从高斯分布到威布尔分布

Global Journal of Researches in Engineering Pub Date : 2023-04-27 DOI: 10.34257/gjreivol23is1pg1

Xu Jiajin, Gao Zhentong

{"title":"From Gaussian Distribution to Weibull Distribution","authors":"Xu Jiajin, Gao Zhentong","doi":"10.34257/gjreivol23is1pg1","DOIUrl":"https://doi.org/10.34257/gjreivol23is1pg1","url":null,"abstract":"The Gaussian distribution is one of the most widely used statistical distributions, but there are a lot of data that do not conform to Gaussian distribution. For example, structural fatigue life is mostly in accordance with the Weibull distribution rather than the Gaussian distribution, and the Weibull distribution is in a sense a more general full state distribution than the Gaussian distribution. However, the biggest obstacle affecting the application of the Weibull distribution is the complexity of the Weibull distribution, especially the estimation of its three parameters is relatively difficult. In order to avoid this difficulty, people used to solve this problem by taking the logarithm to make the data appear to be more consistent with the Gaussian distribution. But in fact, this approach is problematic, because from the physical point of view, the structure of the data has changed and the physical meaning has changed, so it is not appropriate to use logarithmic Gaussian distribution to fit the original data after logarithm. The author thinks that Z.T. Gao method can give the estimation of three parameters of Weibull distribution conveniently, which lays a solid mathematical foundation for Weibull distribution to directly fit the original data.","PeriodicalId":342934,"journal":{"name":"Global Journal of Researches in Engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133352120","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