现代机械工程(英文)最新文献_第8页

Positioning the Angle of Attack Sensor on an Unmanned Aerial Vehicle Wing 无人机机翼迎角传感器的定位

现代机械工程(英文) Pub Date : 2016-07-21 DOI: 10.15377/2409-9848.2016.03.01.4

A. H. Birjandi, Valentin Guerry, E. Bibeau, H. Bolandhemmat, K. Xu

引用次数: 0

Performance Study of Refrigeration Units That Use the Refrigerant R-404A by Using Computer Simulation 采用R-404A制冷剂制冷机组性能的计算机模拟研究

现代机械工程(英文) Pub Date : 2016-05-05 DOI: 10.4236/MME.2016.62008

A. Alshqirate

{"title":"Performance Study of Refrigeration Units That Use the Refrigerant R-404A by Using Computer Simulation","authors":"A. Alshqirate","doi":"10.4236/MME.2016.62008","DOIUrl":"https://doi.org/10.4236/MME.2016.62008","url":null,"abstract":"The performance parameters of vapor compression refrigeration units that used the refrigerant R-404A were studied by developing a computer simulation algorithm. The various performance parameters investigated per one kilowatt of refrigeration capacity, such as the mass flow rate, the compressor power consumption, the condenser heat rejection rate, the compressor exit temperature and the coefficient of performance. Two refrigeration cycles were tested under various evaporating and condensing temperatures: the standard cycle and the ideal cycle with superheating and sub-cooling. The results of the present work reveal that the compressor power variation over the evaporating temperature range from –10℃ to 15℃at Tc = 40℃ is decreased by 38.8% for standard cycle and by 43.8% for ideal cycle. The compressor power variation over the condensing temperature range from 30℃ to 50℃ at Te = 10℃ is increased by 122% for standard cycle and by 54.5% for ideal cycle. On the other hand, the COP for the ideal cycle with 5℃ superheating and sub-cooling is approximately 25% higher than that of the standard cycle at Te = 10℃ and Tc = 40℃ for the refrigerant R-404A.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"06 1","pages":"67-75"},"PeriodicalIF":0.0,"publicationDate":"2016-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497619","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

Application of the Morphological Analysis for the Synthesis Arrangements of Industrial Robots with Parallel Structure Mechanisms 形态分析在工业机器人并联机构综合布置中的应用

现代机械工程(英文) Pub Date : 2016-05-05 DOI: 10.4236/MME.2016.62007

I. F. Alrefo

引用次数: 0

Cooling of Granules in Vibrating, Suspended Bed: Engineering Simulation 振动悬浮床中颗粒的冷却:工程仿真

现代机械工程(英文) Pub Date : 2016-05-05 DOI: 10.4236/MME.2016.62009

V. Katz, S. Katz

{"title":"Cooling of Granules in Vibrating, Suspended Bed: Engineering Simulation","authors":"V. Katz, S. Katz","doi":"10.4236/MME.2016.62009","DOIUrl":"https://doi.org/10.4236/MME.2016.62009","url":null,"abstract":"Here we suggest an algorithm for calculation of the process parameters and design of a vertical cooler with inclined, gas-permeable blades and with a vibrating, suspended layer of granules on them (Vibrating Fluidized Bed—VFB). The algorithm is based on the use of the equations of heat and material balance, taking into account the influx of moisture into the layer with cold air and dust—as a carryover. Mode entrainment of dust particles and moisture from the VFB is described by using empirical formulas and Π-theorem. To calculate the cooling time of granules a model of the dynamics of a variable mass VFB was built, which linked the geometrical and physical process parameters to a single dependency. An example showed that mass flow of granules of 248 kg/h and a volume flow of air of 646 m3/h with temperature of 30℃ to cool the zeolite granules from 110℃ to 42℃ for 49 s required a vertical apparatus of rectangular shape with four chambers and with volume of 0.2 m3. A comparative analysis of technological parameters of the projected cooler with the parameters of typical industrial apparatuses showed that for all indicators: the cooling time of granules, the flow rate of gas (air) and the heat flow, a 4-chambered, vertical apparatus of rectangular shape with VFB was the most effective.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"06 1","pages":"76-90"},"PeriodicalIF":0.0,"publicationDate":"2016-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497172","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

Determining the Effect of Cutting Fluids on Surface Roughness in Turning AISI 1330 Alloy Steel Using Taguchi Method 用田口法测定切削液对AISI 1330合金钢车削表面粗糙度的影响

现代机械工程(英文) Pub Date : 2016-05-05 DOI: 10.4236/MME.2016.52006

Onyema J Onuoha, James Oseni Abu, S. A. Lawal, E. Mudiare, M. Adeyemi

{"title":"Determining the Effect of Cutting Fluids on Surface Roughness in Turning AISI 1330 Alloy Steel Using Taguchi Method","authors":"Onyema J Onuoha, James Oseni Abu, S. A. Lawal, E. Mudiare, M. Adeyemi","doi":"10.4236/MME.2016.52006","DOIUrl":"https://doi.org/10.4236/MME.2016.52006","url":null,"abstract":"Taguchi method has been employed to investigate the effects of cutting fluids on surface roughness in turning AISI 1330 alloy steel, using manually operated lathe machine. Experiments have been conducted using L27 (34) orthogonal array and each experiment was repeated three times and each test used a new cutting tool, High Speed Steel (HSS), to ensure accurate readings of the surface roughness. The statistical methods of Signal-to-Noise (S/N) ratio and the Analysis of Variance (ANOVA) were applied to investigate effects of cutting speed, feed rate and depth of cut on surface roughness under different cutting fluids. Minitab 14 software was used to analyze the effect of variables on the surface roughness. Results obtained indicated that optimal variables for the minimum surface roughness were cutting speed of 35 m/min (level 2), feed of 0.124 mm/rev (level 1), depth of cut of 0.3 mm (level 1) and a cutting fluid with a viscosity of 2.898 mm2/s (level 3). Hence, the optimal parameters to obtain better surface roughness of the workpiece material were obtained when groundnut oil based cutting fluid was used. Analysis of variance shows that feed rate has the most significant effect on surface roughness.","PeriodicalId":69007,"journal":{"name":"现代机械工程(英文)","volume":"05 1","pages":"51-59"},"PeriodicalIF":0.0,"publicationDate":"2016-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70497500","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: 19

Approaches for Detailed Modelling of Ultra-Precision Positioning Systems 超精密定位系统的详细建模方法

现代机械工程(英文) Pub Date : 2016-02-04 DOI: 10.4236/MME.2016.61005

D. Dahlmann, N. Sassi, B. Denkena

引用次数: 2

Development of a Flexible Multibody Model to Simulate Nonlinear Effects in Printing Process 模拟印刷过程非线性效应的柔性多体模型的建立

现代机械工程(英文) Pub Date : 2016-02-04 DOI: 10.4236/MME.2016.61002

M. Eckl, T. Lepper, B. Denkena

引用次数: 0

Response Surface Methodology Approach for Transmission Optimization of V-Belt Drive v带传动优化的响应面法

现代机械工程(英文) Pub Date : 2016-02-04 DOI: 10.4236/MME.2016.61004

Nurudeen A. Raji, A. Erameh, A. .. Yussouff, Rasheed O. Durojaye