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Evaluation of thermal performance factor for solar air heaters with artificially roughened channels 人工粗糙通道太阳能空气加热器的热性能系数评价
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2021.137048
{"title":"Evaluation of thermal performance factor for solar air heaters with artificially roughened channels","authors":"","doi":"10.24425/ame.2021.137048","DOIUrl":"https://doi.org/10.24425/ame.2021.137048","url":null,"abstract":"Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s ) , friction factor ratio ( f / f s ) and thermal performance factor ( η ) . Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30 ◦ , 45 ◦ , 60 ◦ and 90 ◦ trapezoidal corrugated geometries while case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45 ◦ are the best configurations for case A and B, respectively. The 45 ◦ corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s , f / f s and η respectively.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1974 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135637097","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: 10
Stress and deformation states in single-coil inductors used for pipe calibration by means of electrodynamic method 用电动力学方法标定管道用单线圈电感的应力和变形状态
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2007.131562
J. Bednarczyk
{"title":"Stress and deformation states in single-coil inductors used for pipe calibration by means of electrodynamic method","authors":"J. Bednarczyk","doi":"10.24425/ame.2007.131562","DOIUrl":"https://doi.org/10.24425/ame.2007.131562","url":null,"abstract":"The article presents results of tests performed at the AGH-University of Science and Technology in Cracow on strength of single-coil inductors used as tools in electrodynamic machining of pipes. The character of volumetric Lorentz forces acting on coils of compressing and expanding inductors was discussed, and numerically determined distributions of stresses and displacements created in coils under the impact of these forces were presented. The problems presented are relevant when designing durable inductors intended for industrial applications.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"39 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135724056","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
Wheelchair mechanism for negotiating obstacles 轮椅机构，用于越过障碍
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132100
J. Bałchanowski, J. Szrek, S. Wudarczyk
{"title":"Wheelchair mechanism for negotiating obstacles","authors":"J. Bałchanowski, J. Szrek, S. Wudarczyk","doi":"10.24425/ame.2009.132100","DOIUrl":"https://doi.org/10.24425/ame.2009.132100","url":null,"abstract":"Moving with the wheelchair can be a serious problem, especially when the obstacle occurs on its way. An alternative solution would be to equip the wheelchair with appropriate mechanical device, thanks to that it becomes possible to overcome barriers such as kerbs or doorsteps. In this paper, the authors present an idea of mechanism overcoming barriers by the wheelchair. Type and geometrical synthesis have been presented. The mechanism is modelled in a multibody computer analysis system and sample simulation research results are reported.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"39 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135724058","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
An improvement of a hydraulic self-climbing formwork 液压自爬模板的改进
IF 0.7
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2019.131419
V. Nguyen, Kiem Anh Nguyen, V.-L. Nguyen
{"title":"An improvement of a hydraulic self-climbing formwork","authors":"V. Nguyen, Kiem Anh Nguyen, V.-L. Nguyen","doi":"10.24425/AME.2019.131419","DOIUrl":"https://doi.org/10.24425/AME.2019.131419","url":null,"abstract":"Nowadays, self-climbing formworks are commonly used in the construction of concrete buildings with a great height, such as high-rise buildings, silos, and bridge piers. A regular formwork can be improved to have more functions, e.g., the formwork itself can climb to the desired construction site. Climbing characteristics of the formwork as well as opening and closing characteristics of the formwork shell are essential criteria for evaluating the performance of a self-climbing formwork. The effective ones were mentioned in different studies, where most of them were published in patents of countries, e.g., the United States and China. Dissimilar from these studies, this paper presents several improvements for some certain groups to enhance the features of a hydraulic self-climbing formwork. Based on the analysis of the composition and the working principle of the actual climbing formwork types, a new opening and closing method of the formwork shells and a new rail clamping device are suggested. They are applied to design a self-climbing formwork with the shell’s working size of 4 m × 3 m. Their load capacity, as well as the flatness of the concrete surface after casting, are assessed. The proposed solutions can result in various advantages, e.g., the shorter initial alignment time, the increase of the quality concrete surface, and the maximal automation for construction operations.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68944898","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: 5
Modeling and control of a simplified high-speed vehicle moving in reduced-pressure conditions 减压条件下简化高速车辆的建模与控制
IF 0.7
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/AME.2019.129680
Natalia Strawa, P. Malczyk
{"title":"Modeling and control of a simplified high-speed vehicle moving in reduced-pressure conditions","authors":"Natalia Strawa, P. Malczyk","doi":"10.24425/AME.2019.129680","DOIUrl":"https://doi.org/10.24425/AME.2019.129680","url":null,"abstract":"In times of rapidly progressing globalization, the possibility of fast long-distance travel between high traffic cities has become an extremely important issue. Cur-rently, available transportation systems have numerous limitations, therefore, the idea of a high-speed transportation system moving in reduced-pressure conditions has emerged recently. This paper presents an approach to the modelling and simulation of the dynamic behaviour of a simplified high-speed vehicle that hovers over the track as a magnetically levitated system. The developed model is used for control system design. The purpose of passive and active suspension discussed in the text is to improve both the performance and stability of the vehicle as well as ride comfort of passengers travelling in a compartment. Comparative numerical studies are performed and the results of the simulations are reported in the paper with the intent to demonstrate the benefits of the approach employed here.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945188","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
Research of air movement in the labyrinth seal of rollers of conveyor belt 传送带托辊迷宫密封中空气运动的研究
IF 0.7
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2019.131356
G. S. Kononov, S. Artemov, S. S. Dubrovskyi, D. Kravtsova
{"title":"Research of air movement in the labyrinth seal of rollers of conveyor belt","authors":"G. S. Kononov, S. Artemov, S. S. Dubrovskyi, D. Kravtsova","doi":"10.24425/ame.2019.131356","DOIUrl":"https://doi.org/10.24425/ame.2019.131356","url":null,"abstract":"","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68945237","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
The influence of stabilization of load positioning in an offshore crane on taut-slack phenomenon in a rope 海上起重机载荷定位稳定化对绳索紧松现象的影响
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132102
A. Maczyński, S. Wojciech
{"title":"The influence of stabilization of load positioning in an offshore crane on taut-slack phenomenon in a rope","authors":"A. Maczyński, S. Wojciech","doi":"10.24425/ame.2009.132102","DOIUrl":"https://doi.org/10.24425/ame.2009.132102","url":null,"abstract":"The peculiarity of offshore cranes, i. e. cranes based on ships or drilling platforms, is not only a significant motion of their base, but also the taut-slack phenomenon. Under some circumstances a rope can temporarily go completely slack, while a moment later, the force in the rope can increase to nominal or even higher value. Periodic occurrence of such phenomena can be damaging to the supporting structure of the crane and its driver. In the paper, mathematical models of offshore cranes that allow for analysis of the taut-slack phenomenon are presented. Results of numerical calculations show that the method of load stabilization proposed by the authors in their earlier works can eliminate this problem.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"11 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544656","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
Application of a hydraulic–linkage mechanism to balance the excavating equipment in heavy machines 液压连杆机构在重型机械开挖设备平衡中的应用
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2008.131625
G. Tora
{"title":"Application of a hydraulic–linkage mechanism to balance the excavating equipment in heavy machines","authors":"G. Tora","doi":"10.24425/ame.2008.131625","DOIUrl":"https://doi.org/10.24425/ame.2008.131625","url":null,"abstract":"The author suggests that a mobile counterweight mechanism could be introduced to the excavator structure for coupling the hydraulic system with the excavating equipment. It is shown that the mobile counterweight mechanism reduces power demand, at the same time improving stability of the excavator.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"10 21","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544671","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
Experimental research of characteristic parameters hydrodynamic processes of axial piston pumps with constant pressure and variable flow 恒压变流量轴向柱塞泵特性参数流动力过程试验研究
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132092
R. Petrović, A. Banaszek
{"title":"Experimental research of characteristic parameters hydrodynamic processes of axial piston pumps with constant pressure and variable flow","authors":"R. Petrović, A. Banaszek","doi":"10.24425/ame.2009.132092","DOIUrl":"https://doi.org/10.24425/ame.2009.132092","url":null,"abstract":"Axial piston pumps with constant pressure and variable flow have extraordinary possibilities for controlling the flow by change of pressure. Owing to pressure feed-back, volumetric control of the pump provides a wide application of these pumps in complex hydraulic systems, particularly in aeronautics and space engineering. Mathematical modeling is the first phase in defining the conception of a design and it has been carried out at the beginning of the project. Next very important phase is the check-out of the characteristics at the physical model when the pump has been produced. Optimal solution to the hydropump design has been reached by thorough analysis of the parameters obtained at the physical model by means of the simulation results of the mathematical model. The paper presents the possibilities for selecting the most influential parameters, their correction for certain values, and eventually the simulation at the mathematical model which shows the change of hydropump performances. After all these analyses, appropriate changes are made in design documentation which will serve for prototype production. Finally, when all kinds of tests are done at the prototypes along with fine adjustment of design solution, the series production of hydropump will be organized.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"10 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544673","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
Numerical analysis of micro ring-engine fluid dynamics 微环发动机流体动力学数值分析
Archive of Mechanical Engineering Pub Date : 2023-11-06 DOI: 10.24425/ame.2009.132095
J. R. Piechna
{"title":"Numerical analysis of micro ring-engine fluid dynamics","authors":"J. R. Piechna","doi":"10.24425/ame.2009.132095","DOIUrl":"https://doi.org/10.24425/ame.2009.132095","url":null,"abstract":"This paper presents an idea and results of 2D and 3D numerical CFD simulations of the proposed ring-engine construction dedicated for air propulsion or generation of electric power. The engine is designed as the simplest construction realizing the idea of pulsating reaction chamber utilizing a constant volume combustion principle. An atypical fuel (hydrogen peroxide) is used in the analyzed construction. The proposed ring-engine has reaction chambers forming a part of a ring periodically filled by cooling air and hydrogen peroxide vapour. The H 2 O 2 is decomposed in exothermic reaction increasing pressure inside the chamber of constant volume. High pressure gas contents of the reaction chambers are periodically decompressed by jet nozzles generating torque. The paper contains the description of the ring-engine idea, the schematic engine geometry and a set of data visualizing pressure, velocity, temperature and species distribution inside the engine components being results of numerical simulations.","PeriodicalId":45083,"journal":{"name":"Archive of Mechanical Engineering","volume":"31 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135544872","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: 3
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