International Journal of Mechanics最新文献

{"title":"Water from Air Production System based on Solar Energy in Egypt","authors":"H. Farghally, N. Ahmed, A. Nafeh, F. H. Fahmy, Amal A. Hassan, Emaad A. Sweelem","doi":"10.46300/9104.2020.14.28","DOIUrl":"https://doi.org/10.46300/9104.2020.14.28","url":null,"abstract":"Fresh water supplies are among the most limiting conditions in arid regions. Drinking water shortage is chronic, acute and widespread in North Africa, the Middle East and South Asia. The extraction of fresh water from the atmosphere has been adopted and developed as a new technology to provide water in remote areas. This paper concentrates on the extracting of potable water from air in remote areas using solar energy. A theoretical study for extracting water from atmospheric air is presented and performance of water production system based on standalone PV system was simulated and evaluated for two sites in Egypt; namely, Hurghada and Khargha Oasis. The unit extracts water by using solar thermal energy as the heating source for air and solar photovoltaic energy for supplying water production system driven fan. Perturb and observe (P&O) method for maximum power point tracking (MPPT) has been designed and simulated for the proposed PV system. A Mathematical and simulation models using MATLAB/ SIMULINK software have been developed for evaluating the performance of the proposed system. The effect of climate conditions; ambient temperature and solar radiation on the PV system output power based on P&O controller was also demonstrated. It was found that more amount of water from atmosphere can be extracted from densely humid and highly solar radiation regions.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41863474","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}

{"title":"Spatial Analysis and Temporal Trend of Registered Noise Complaints in the City of Milan, Italy","authors":"R. Benocci, S. S. Muchetti, D. Salvi, F. Angelini, G. Brambilla, G. Zambon","doi":"10.46300/9104.2020.14.23","DOIUrl":"https://doi.org/10.46300/9104.2020.14.23","url":null,"abstract":"Noise complaints, expressed by individuals or a group of people, are the outcome of a complex behaviour depending not only on the noise exposure and its evoked annoyance, but also on other factors such as socioeconomic ones. Noise annoyance has significant impacts on the quality of life and health of inhabitants, as well as social cohesion. Thus, noise complaints are a very important issue to tackle for national and local policy makers and for all stakeholders involved in planning and management of noise mitigation actions. Within the above framework, the present study describes the analysis of noise complaints submitted by citizens to the municipality of Milan, Italy, from years 2000 to 2015. These complaints have been organized in a database and analyzed considering: i) types of noise source (technical facilities, music, transport infrastructures, etc.); ii) business/leisure activities (retail and catering businesses, production, service sector, etc.) and iii) outcomes of the complaints inspection by local authorities. In addition, by means of a GIS software, the territorial distribution of noise complaints has been determined according to the noise source category and disturbing activity. This analysis includes also a geo-statistical representation by density maps. The results show that, even though road traffic is the dominant noise source in residential and urban areas, the perception of other noises, such as those from industrial facilities, civil construction and social activities (parties, fairs and open air markets, residential noise, etc.), is perceived as more annoying. The results show that since 2007 the number of noise complaints (about 100-150 complaints/year) remains almost constant across the years. However, the spreading of leisure activities, malls, exhibition centers and venues, as observed for the years 2014-2015, would most likely grow them even more. This outcome can assist the local authority in the management of the activities in order to reduce their harmful impact on the population.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49435374","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}

{"title":"Finite Element Models and Numerical Analysis of a Structural Glass Beam Reinforced with Embedded Carbon Fibre Rod","authors":"D. Foti, Michela Lerna, L. Carnimeo, Vacca Vitantonio","doi":"10.46300/9104.2020.14.22","DOIUrl":"https://doi.org/10.46300/9104.2020.14.22","url":null,"abstract":"Due to the its brittleness and unpredictable failure behaviour, the glass is considered a structurally unsafe material. The poor tensile strength and the occurrence of brittle failures prevent the possible use of structural glass elements (i.e. floors, beams and columns). The present study focuses on the numerical analysis of glass beams reinforced with composite material (Fiber Reinforced Polymer) and the numerical analysis of the behaviour of glass plates after being punched. In particular, the method of reinforcement analysed consists in embedding the Carbon FRP-rod in the interlayer of laminated structural glass beams with the aim to increase their failure strength, but also the post-failure strength and ductility. A numerical analysis on different specimens has been carried out to evaluate the effect of the reinforcement. The response of the reinforced and un-reinforced beams has been compared and the results have been discussed. The results provide an estimation of the expected performance in order to propose a reinforcement method for glass beams using FRP composites. This study includes the numerical analysis on laminated glass plates with wide holes at both ends, the latter made for technological reasons to connect the glass beam to the structure. The obtained results are compared with integer specimens.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44207576","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}

{"title":"Proposed Method for Two Axis Tracking of PV Modules Using Advanced Microcontroller","authors":"","doi":"10.46300/9104.2020.14.21","DOIUrl":"https://doi.org/10.46300/9104.2020.14.21","url":null,"abstract":"In this study, a stand-alone photovoltaic power system was designed and implemented to operate as an application of a digital control system. Sun-tracker is implemented for improved efficiency of the system by keeping the solar module perpendicular to the sun's incoming rays. An experimental system was implemented to demonstrate the effectiveness of the proposed system. Experimental results are given to verify the system's efficiency. A proposed method is employed to seek the maximum power point using two lighting sensors the data obtained from a two sensor is compared by microcontroller. Microcontroller is making PV module track the maximum sun light which leads to obtain a maximum power. The system is implemented using microcontroller and stepper motor and experimental work used to prove feasibility of the proposed method.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70491362","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}

{"title":"V-belts and Their Performance Resulting Fromtheir Inner Hybrid Structure","authors":"","doi":"10.46300/9104.2020.14.20","DOIUrl":"https://doi.org/10.46300/9104.2020.14.20","url":null,"abstract":"Paper provides a study and comparison ofnarrow and classical cross-sections of five V-belts withdifferent inner structure, material composition and shape.The performance is evaluated by non-contact monitoringof transversal vibration velocity together with belttemperature caused by friction and vibrations at variousoperational states when changing the loading, revolutionsof driver pulley and tensioning force. Moreover, thevibration regimes are observed. The study presentswhether concave sides, adhesion layer, higher compressioncore, transverse reinforcing fibers, notches, wrap ofprofile, naked belt sides cause the different performance.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45042631","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}

{"title":"On the Long-time Behavior of the Solution of a Non Linear Viscoelastic Plate Equation with infinite Memory and General Kernel","authors":"","doi":"10.46300/9104.2020.14.19","DOIUrl":"https://doi.org/10.46300/9104.2020.14.19","url":null,"abstract":"","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45305886","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}

{"title":"CFD Investigations of the Effect of Rotating Wheels, Ride Height and Wheelhouse Geometry on the Drag Coefficient of Electric Vehicle","authors":"","doi":"10.46300/9104.2020.14.17","DOIUrl":"https://doi.org/10.46300/9104.2020.14.17","url":null,"abstract":"The development of electric vehicles demands minimizing aerodynamic drag in order to provide maximum range. The wheels contribute significantly to overall drag coefficient value because of flow separation from rims and wheel arches. In this paper various design parameters are investigated and their influence on vehicle drag coefficient is presented. The investigation has been done with the help of computational fluid dynamics (CFD) tools and with implementation of full vehicle setup with rotating wheels. The obtained results demonstrate changes in drag coefficient with respect to the change of design parameters.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46059248","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}

{"title":"Optimization of the Electric Vehicle HVAC Duct System Based on Gradient Method","authors":"","doi":"10.46300/9104.2020.14.18","DOIUrl":"https://doi.org/10.46300/9104.2020.14.18","url":null,"abstract":"Our study describes the optimization of the part of heating, ventilation and air conditioning (HVAC) system of an electric car. The geometry of the air duct connected to the heater unit on one side and the dashboard on the other. From the point of view of aerodynamics, it is necessary to change the geometry of the air duct so as to minimize the loss of air pressure and ensure a more uniform flow from the exit holes to improve the efficiency of windshield heating. In order to optimize the initial geometry of the air duct, approach of using gradient methods was applied. According to the results of the study, detailed concept of optimizing the air duct of an electric car is presented. The optimized geometry was tested with the use of methods of computational aerodynamics. Calculations were made as part of the interior model of electric car with the output of temperature fields on the windshield. The results can be applied to the design of heating, ventilation and air conditioning systems of vehicles in a short time.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49658555","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}

{"title":"Performances and Shapes of Acceleration-deceleration Curve of Kinematical Linkages","authors":"Ioana Enescu","doi":"10.46300/9104.2020.14.16","DOIUrl":"https://doi.org/10.46300/9104.2020.14.16","url":null,"abstract":"The transient duty has a very important role within the kinematical linkages of the numerical control machine tools and industrial robots. The acceleration and deceleration of the movable element of the kinematical linkage participates directly to achieving the positioning accuracy and to the path error. This work presents the main shapes of the acceleration- deceleration curve of the kinematical linkage, as well as their performances. Shapes of the acceleration-deceleration curve are presented for positioning linkages as well as for contouring linkages. The extent of influence upon the contour error in case of the linear and exponential acceleration-deceleration of kinematical linkage is also presented. The works is also giving recommendations on the way of choosing the type of curve being used in case of various transient processes, by the machine tool builders, with a view to obtaining high dynamical performances. In general, the recommendations are considering the inertia of the mobile element and the imposed path error. By knowing the acceleration shape, the machine tool designer and builder can know, even from the design stage, the area of the transient duty where the acceleration is maximal. The maximum acceleration imposes the rate of the impulsion torque of the drive servomotor based on which the kinematical linkage is sized, in terms of its components.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43412421","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}

{"title":"On the Problem of Optimizing the Door Hinge of Electro Car by Generative Design Methods","authors":"","doi":"10.46300/9104.2020.14.15","DOIUrl":"https://doi.org/10.46300/9104.2020.14.15","url":null,"abstract":"Our research describes the optimization of car door hinges. The model we are considering is a pair of upper and lower hinges of car doors and cases of their loading. Optimization of this part of the vehicle consists in reducing the mass of the product, which is taken as the target function, while maintaining the mechanical characteristics within acceptable values. The characteristics of various types of manufacturing, such as milling, casting, and additive manufacturing, were also used as optimization criteria. During the research the authors have undertaken the task of using the most advanced approaches for calculation, optimization and analysis of their results, which are the use of special calculation systems, calculations that are performed on the GPU, what is the way much reduces the required optimization time, methods of generative design to achieve the required criteria and consideration of possible methods of manufacture of the workpiece in terms of additive manufacturing. The result of our research is the concept of optimizing vehicle door hinges and selecting the appropriate production method. As a test of the positive effect of the applied method, a repeated static calculation of the structure was made, based on the optimized geometry.","PeriodicalId":39203,"journal":{"name":"International Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41783572","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}