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Synthetic jet actuator with two opposite diaphragms 具有两个相对隔膜的合成射流致动器
Mechanics and Mechanical Engineering Pub Date : 2020-09-01 DOI: 10.2478/mme-2020-0004
E. Smyk, S. Wawrzyniak, K. Peszyński
{"title":"Synthetic jet actuator with two opposite diaphragms","authors":"E. Smyk, S. Wawrzyniak, K. Peszyński","doi":"10.2478/mme-2020-0004","DOIUrl":"https://doi.org/10.2478/mme-2020-0004","url":null,"abstract":"Abstract The synthetic jet actuators are one of the most investigated types of actuators used in heat transfer and active flow control. The energetic efficiency of actuators is a key parameter determining the possibility of device use. The actuators with two or more diaphragms have higher efficiency than the actuators with only one. The paper presents the investigations of the acoustic synthetic jet actuator with two opposite diaphragms. In the paper, synthetic jet velocity, Reynolds number and the energetic efficiency as a function of oscillating actuator frequency, for a different cavity, orifice configuration and one real input power P0 = 2 W were studied. The possibility of theoretical calculation of first and second resonance frequency were checked. The coupling ratio for actuators was calculated. The maximum energetic efficiency was η = 8.67% and Reynolds number Re = 8503. The possibility of using the same dependencies and rules during the design of actuators with two opposite diaphragms as in the case of actuators with one diaphragm was demonstrated. The results may be useful in the design of the actuators of the two membranes.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"24 1","pages":"17 - 25"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45205875","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
The effect of dynamics of the swash plate–slippers–piston assembly on friction torques in bearings in compressor of cooling aggregate 斜盘-滑块-活塞总成动力学对冷却集料压缩机轴承摩擦力矩的影响
Mechanics and Mechanical Engineering Pub Date : 2020-09-01 DOI: 10.2478/mme-2020-0006
M. Woźniak, T. Szydłowski, K. Siczek
{"title":"The effect of dynamics of the swash plate–slippers–piston assembly on friction torques in bearings in compressor of cooling aggregate","authors":"M. Woźniak, T. Szydłowski, K. Siczek","doi":"10.2478/mme-2020-0006","DOIUrl":"https://doi.org/10.2478/mme-2020-0006","url":null,"abstract":"Abstract The swash plate type compressor utilized in car air conditioning devices and cooling system was analyzed in this study. Proper dynamic behavior of the components in such a compressor affected the correct functioning of the whole system. The aim of the study was to identify the characteristics of the main motion components in the swash plate–slippers–piston assembly of the compressor and to estimate the friction torques in its bearings. Some models of this assembly are elaborated and presented in the paper. The main components of slipper complex motion were identified, such as reciprocal motion along the axis of piston, rotation around piston axis, and short-time rotation around its own axis. Friction torque in axial bearing was higher than in journal bearing and varied with the rotational angle. Friction torques in journal bearings varied with the rotational angle and had different courses for two bearings of the compressor.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"24 1","pages":"42 - 55"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41375089","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
Robotic machining in correlation with a 3D scanner 与3D扫描仪相关的机器人加工
Mechanics and Mechanical Engineering Pub Date : 2020-09-01 DOI: 10.2478/mme-2020-0003
K. Kurc, A. Burghardt, D. Szybicki, P. Gierlak, Wojciech Łabuński, M. Muszyńska, J. Giergiel
{"title":"Robotic machining in correlation with a 3D scanner","authors":"K. Kurc, A. Burghardt, D. Szybicki, P. Gierlak, Wojciech Łabuński, M. Muszyńska, J. Giergiel","doi":"10.2478/mme-2020-0003","DOIUrl":"https://doi.org/10.2478/mme-2020-0003","url":null,"abstract":"Abstract The article presents an original method of communication and data exchange in a robotic machining station consisting of two robots, a positioner and a 3D optic scanner. The task of one of the robots, equipped with a 3D optic scanner, was to receive point cloud of a detail (mould) attached to the positioner table. After detail digitalisation, the received point cloud was adjusted to (compared with) a model detail in the form of a CAD file in the Atos Professional software. In the software, casting material excesses were received in places selected on the detail. Values of the excesses and their coordinates were saved in the script and sent to the robot controller using TCP/IP protocol. The other of robots, equipped with the force control addition and the option of obtaining various processing tools, received sent excess and its coordinates. The other robot adjusted the processing parameters to random excesses, the value of which was received from measurements of the optic scanner of the first robot.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"24 1","pages":"36 - 41"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49065277","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
Design of Accurate Steering Gear Mechanism 精密舵机机构设计
Mechanics and Mechanical Engineering Pub Date : 2020-08-12 DOI: 10.2478/MME-2018-0009
V. Babu, P. G. Rao, K. S. Rao, B. Krishna
{"title":"Design of Accurate Steering Gear Mechanism","authors":"V. Babu, P. G. Rao, K. S. Rao, B. Krishna","doi":"10.2478/MME-2018-0009","DOIUrl":"https://doi.org/10.2478/MME-2018-0009","url":null,"abstract":"This article focuses on the synthesis of a steering mechanism that exactly meets the requirements of steering geometry. It starts from reviewing the four-bar linkage, then discusses the number of points that a common four-bar linkage could precisely trace at most. After pointing out the limits of a four-bar steering mechanism, this article investigates the turning geometry for steering wheels and proposes a steering mechanism using servo motors and ARDUINO board. The pitch curves, addendum curves, dedendum curves, tooth profiles and transition curves of the noncircular gears are formulated and designed. Finally, kinematic simulations are executed to demonstrate the target of design","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"93-104"},"PeriodicalIF":0.0,"publicationDate":"2020-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69233512","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
Comparative evaluation of diametral tensile strength of phosphate-bonded investment (ringless) material by using air-drying method, conventional hot air oven, microwave oven, and combination of microwave and conventional oven: An in vitro study. 使用风干法、传统热风炉、微波炉以及微波炉与传统炉相结合的方法对磷酸盐粘结投资（无环）材料的直径拉伸强度进行比较评估：体外研究。
Mechanics and Mechanical Engineering Pub Date : 2019-07-01 DOI: 10.4103/jips.jips_45_19
Akhil Rathi, Neelam Pande, Usha Radke, Saee Deshpande, Anuj Chandak
{"title":"Comparative evaluation of diametral tensile strength of phosphate-bonded investment (ringless) material by using air-drying method, conventional hot air oven, microwave oven, and combination of microwave and conventional oven: An <i>in vitro</i> study.","authors":"Akhil Rathi, Neelam Pande, Usha Radke, Saee Deshpande, Anuj Chandak","doi":"10.4103/jips.jips_45_19","DOIUrl":"10.4103/jips.jips_45_19","url":null,"abstract":"<p><strong>Aim: </strong>This study evaluated and compared the diametral tensile strength (DTS) of phosphate-bonded investment (PBI) material (ringless) used in removable cast partial denture fabrication.</p><p><strong>Settings and design: </strong>Comparative - <i>Invitro</i> study.</p><p><strong>Materials and methods: </strong>The PBI material, Wirovest used in this study was subjected to four different drying methods. A total of 80 specimens were prepared in a cylindrical form; 20 specimens were air dried for 2 h, 20 specimens were dried in a conventional oven at 230°C for 1 h, 20 specimens were dried in microwave oven at 600 W for 10 min, and remaining 20 specimens were dried first in microwave oven and then in conventional oven. The dried specimens were tested at 2-h interval for diametral compression at a crosshead speed of 0.5 cm/min.</p><p><strong>Statistical analysis used: </strong>Pairwise analysis.</p><p><strong>Results: </strong>The microwave drying technique and drying by combination method resulted in greater DTS, respectively.</p><p><strong>Conclusion: </strong>Within the limitation of this study, PBI specimens dried in microwave oven at 600W for 10 min increased the diametral strength and are also a time-saving procedure.</p>","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"22 1","pages":"248-254"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6685339/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91220368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of Genetic Algorithm Technique for Machining Parameters Optimization in Drilling of Stainless Steel 遗传算法技术在不锈钢钻孔加工参数优化中的应用
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0036
T. Kannan, B. Kumar, G. Kannan, M. Umar, Mohammad Chand Khan
{"title":"Application of Genetic Algorithm Technique for Machining Parameters Optimization in Drilling of Stainless Steel","authors":"T. Kannan, B. Kumar, G. Kannan, M. Umar, Mohammad Chand Khan","doi":"10.2478/mme-2019-0036","DOIUrl":"https://doi.org/10.2478/mme-2019-0036","url":null,"abstract":"Abstract This work is aimed at developing relations between the pertinent variables that affect drilling process of stainless steel using artificial neural network. The experiments were conducted on vertical CNC machining centre. The parameters used were spindle speed and feed rate. The effect of machining parameters on entry burr height, exit burr height and surface roughness was experimentally evaluated for different spindle speeds and feed rates. A model was established between the drilling parameters and experimentally obtained data using ANN. The predicted values and measured values are fairly close, which indicates that the developed model can be effectively used to predict the burr height and surface roughness in drilling of stainless steel. Genetic algorithm (GA) technique was used in this work to identify the optimized drilling parameters. Confirmation test was conducted with the optimized parameters and it was found that confirmation test results were similar to that of GA-predicted output values.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"271 - 276"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45877273","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
Resonance of Nanoscale Beam due to Various Sources in Modified Couple Stress Thermoelastic Diffusion with Phase Lags 具有相位滞后的修正耦合应力热弹性扩散中不同源纳米光束的共振
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0006
Rajneesh Kumar, S. Devi, Veena Sharma
{"title":"Resonance of Nanoscale Beam due to Various Sources in Modified Couple Stress Thermoelastic Diffusion with Phase Lags","authors":"Rajneesh Kumar, S. Devi, Veena Sharma","doi":"10.2478/mme-2019-0006","DOIUrl":"https://doi.org/10.2478/mme-2019-0006","url":null,"abstract":"Abstract This paper deals with the study of thermoelastic thin beam in a modified couple stress with three-phase-lag thermoelastic diffusion model subjected to thermal and chemical potential sources. The governing equations are derived by using the Euler-Bernoulli beam assumption and eigenvalue approach. The Laplace transform technique is employed to obtain the expressions for displacements, lateral deflection, temperature change, axial stress and chemical potential. A particular type of instantaneous and distributed sources is taken to show the utility of the approach. The general algorithm of the inverse Laplace transform is developed to compute the results numerically. The numerical results are depicted graphically to show the effects of phase lags, with and without energy dissipation on the resulting quantities. Some special cases are given.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"36 - 49"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43476529","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
Development of a cryogenic condenser and computation of its heat transfer efficiency based on liquefaction of nitrogen gas 基于氮气液化的低温冷凝器的研制及其传热效率计算
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0039
D. R. Chowdhury, N. Chakraborty, S. Sarkar
{"title":"Development of a cryogenic condenser and computation of its heat transfer efficiency based on liquefaction of nitrogen gas","authors":"D. R. Chowdhury, N. Chakraborty, S. Sarkar","doi":"10.2478/mme-2019-0039","DOIUrl":"https://doi.org/10.2478/mme-2019-0039","url":null,"abstract":"Abstract The typical cryogenic condenser described here transfers the refrigerating effect from its inner side to its outer side through the wall of the condenser. The separate close refrigeration cycle operates on Reverse Stirling Cycle using hydrogen or helium as working fluid. The nitrogen gas gets liquefied when it comes in contact with the cold outer surface of the condenser. We have successfully developed a cryogenic condenser using copper of electrolytic grade for a liquefaction duty of 10 liters of liquid nitrogen per hour. Condenser effectiveness is evaluated by assembling it in Cryogenerator model, ZIF-1002 and by noting the liquefaction rate. Both the results are satisfactory. Selection of material, fabrication, testing of the condenser developed for a Cryogenerator have been described in the paper to assess its suitability for a Cryogenerator based on Reverse Stirling cycle liquefier.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"291 - 296"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47060003","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
Load-carrying capacity of the GFRP and CFRP composite beams subjected to three-point bending test – numerical investigations GFRP和CFRP组合梁三点弯曲承载力的数值研究
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0037
D. Banat
{"title":"Load-carrying capacity of the GFRP and CFRP composite beams subjected to three-point bending test – numerical investigations","authors":"D. Banat","doi":"10.2478/mme-2019-0037","DOIUrl":"https://doi.org/10.2478/mme-2019-0037","url":null,"abstract":"Abstract The subject of this article is the finite element method (FEM) simulation of the multi-layered rectangular composite beam subjected to three-point bending test. The study is focused on the composite beams made of glass or carbon fibre-reinforced laminates (glass fibre-reinforced polymer [GFRP] and carbon fibre-reinforced polymer [CFRP]) for which different laminate stacking were addressed. Three beam geometries with various length-to-thickness ratios included short beam shear (SBS) test, provided the beam is short relative to its thickness, which maximised the induced shear stresses. Simulation included the application of Tsai–Hill, Hoffman, Tsai–Wu, Hashin and Puck failure criteria to perform the composite beam failure analysis wherein the matrix and fibre failure were considered separately. Numerical failure studies also aimed to verify the beam failure modes and the participation of stress tensor elements in material failure.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"277 - 286"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48968069","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: 6
Investigation of the effect of thermal stress on the interface damage of hybrid biocomposite materials 热应力对杂化生物复合材料界面损伤影响的研究
Mechanics and Mechanical Engineering Pub Date : 2019-06-01 DOI: 10.2478/mme-2019-0034
S. Sadat, A. Mokaddem, B. Doumi, M. Berber, A. Boutaous
{"title":"Investigation of the effect of thermal stress on the interface damage of hybrid biocomposite materials","authors":"S. Sadat, A. Mokaddem, B. Doumi, M. Berber, A. Boutaous","doi":"10.2478/mme-2019-0034","DOIUrl":"https://doi.org/10.2478/mme-2019-0034","url":null,"abstract":"Abstract In this paper, we have studied the effect of thermal stress on the damage of fiber-matrix interface of a hybrid biocomposite composed of two natural fibers, Hemp, Sisal, and Starch matrix. Our genetic modeling used the nonlinear acoustic technique based on Cox’s analytical model, Weibull’s probabilistic model, and Lebrun’s model describing the thermal stress by the two coefficients of expansion. The stress applied to our representative elementary volume is a uni-axial tensile stress. The numerical simulation shows that the Hemp- Sisal/Starch hybrid biocomposite is most resistant to thermal stresses as compared with Hemp/Starch biocomposite. It also shows that hybrid biocomposite materials have a high resistance to applied stresses (mechanical and thermal) compared to traditional materials and biocomposite materials. The results obtained in our study coincide perfectly with the results of Antoine et al., which showed through experimental tests that natural fibers perfectly improve the mechanical properties of biocomposite materials.","PeriodicalId":53557,"journal":{"name":"Mechanics and Mechanical Engineering","volume":"23 1","pages":"253 - 258"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49422829","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
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