Mechanics & Industry最新文献_第9页

Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México 青海6种气候条件下地热地空换热器的热势

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-02-01 DOI: 10.1051/meca/2020016

M. Rodríguez-Vázquez, J. Xamán, Y. Chávez, I. Hernández-Pérez, E. Simá

{"title":"Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México","authors":"M. Rodríguez-Vázquez, J. Xamán, Y. Chávez, I. Hernández-Pérez, E. Simá","doi":"10.1051/meca/2020016","DOIUrl":"https://doi.org/10.1051/meca/2020016","url":null,"abstract":"In this paper, the thermal and ventilation potential of a geothermal Earth-to-Air Heat exchanger (EAHE) is studied for six weather in Mexico. The cities for the study and their climate were Villahermosa (hot-humid), Merida (hot-sub humid), Monterrey (dry), Juarez City (very dry), Zacualtipan-Hidalgo (warm-humid) and Mexico City (warm-sub-humid). The thermal behavior of the EAHE was modeled numerically for the corresponding warmest and coldest days of the year for each city and three values of Reynolds number. The 24 hrs simulations were carried out with an in-house code using data every 10 minutes. To get the results, 5,184 computational runs were necessary. The results showed that the EAHE has poor ventilation potential for climates with high levels of humidity such as Villahermosa, while for cities with low levels of humidity such as Chihuahua, the ventilation potential increases significantly, the rest of the cities fall in between. As for its application in Mexico, the results show that the EAHE is highly recommended for dry climates such as at the north of the country and not recommended for humid climates such as at the south and south-east of the country.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":"30 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85665080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Experimental investigation into characterization and machining of Al + SiCp nano-composites using coated carbide tool 涂层硬质合金刀具制备Al + SiCp纳米复合材料的实验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-02-01 DOI: 10.1051/meca/2020015

P. Swain, K. D. Mohapatra, R. Das, A. Sahoo, A. Panda

{"title":"Experimental investigation into characterization and machining of Al + SiCp nano-composites using coated carbide tool","authors":"P. Swain, K. D. Mohapatra, R. Das, A. Sahoo, A. Panda","doi":"10.1051/meca/2020015","DOIUrl":"https://doi.org/10.1051/meca/2020015","url":null,"abstract":"The current research paper discusses the characterization and machining (turning) operation of aluminium (Al) and silicon carbide nano particle (SiCp) nano composite. The paper reveals proper distribution of silicon carbide nano particles (25nm) with aluminium metal matrix. Initially, tensile test has been carried on metal matrix nano composite to study its different properties. It was noticed that the properties of Al-SiCp increases by increasing the weight percentage of SiCp. Viker hardness test has also been conducted to find out the hardness of metal matrix nano composites. Different techniques i.e. Optical microscopy EDX-Analysis were utilized to find out various ingredients of the nano-composite material. The experimental study was carried out using Taguchi L16 orthogonal array by taking three different factors at four different levels each. The response parameters i.e. flank wear of coated carbide insert and surface roughness of Al-SiCp has been optimized by using Principal Component Analysis (PCA). Various graphs like main effect plot and normal probability plot have been plotted and studied properly. Different optical images of coated insert carbide tools (Insert CNMG 12040822TN 6010) at different runs were conducted to visualize the effects of process and response parameters. From the ANOVA table, it was found that cutting speed as well as depth of cut are found to the most vital parameters in influencing the responses for VBc and depth of cut and feed are found to the most significant parameters in influencing the responses for Ra.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":"63 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90927551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

A multiobjective optimization of journal bearing with double parabolic profiles and groove textures under steady operating conditions 稳定工况下双抛物型和沟槽结构滑动轴承的多目标优化

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-02-01 DOI: 10.1051/meca/2020017

Chongpei Liu, Ning Zhong, Xi-qun Lu, Bin Zhao

{"title":"A multiobjective optimization of journal bearing with double parabolic profiles and groove textures under steady operating conditions","authors":"Chongpei Liu, Ning Zhong, Xi-qun Lu, Bin Zhao","doi":"10.1051/meca/2020017","DOIUrl":"https://doi.org/10.1051/meca/2020017","url":null,"abstract":"The double parabolic profiles can help journal bearing to reduce bushing edge wear, but it also reduces load carrying capacity and increases friction loss. To overcome these drawbacks, in this study, a multiobjective optimization of journal bearing with double parabolic profiles and groove textures is researched under steady operating conditions using Taguchi and grey relational analysis methods. Firstly, a lubrication model with journal misalignment, elastic deformation, asperity contact, thermal effect is established and formation cause of drawbacks is illustrated. Then, an orthogonal test with considering six factors, i.e., groove number, groove depth, groove length, axial width of double parabolic profiles, radial height of double parabolic profiles and groove location is conducted, meanwhile the effects and significances of each factor on response variables are revealed. Finally, an optimal parameters combination of six factors is determined by grey relational analysis, which gives maximum load carrying capacity and minimum friction loss. Overall, this study may give guidance on journal bearing design to enhance its tribological performance.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":"44 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78664727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Planar tool radius compensation for CNC systems based on NURBS interpolation 基于NURBS插补的数控系统平面刀具半径补偿

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2019044

Jiangang Li, Qian Wang, Ganggang Zhong

{"title":"Planar tool radius compensation for CNC systems based on NURBS interpolation","authors":"Jiangang Li, Qian Wang, Ganggang Zhong","doi":"10.1051/meca/2019044","DOIUrl":"https://doi.org/10.1051/meca/2019044","url":null,"abstract":"This paper introduces the realization of a tool radius compensation algorithm for NURBS trajectory. First, a single-segment NURBS trajectory tool radius compensation algorithm is developed. Different from the straight line and arc trajectory, the self-intersection phenomenon is prone to happen when calculating a single NURBS tool center trajectory, and the self-intersection will cause the overcut of workpiece. To avoid this situation, the algorithm introduced in this paper can detect whether the NURBS tool center track has caused overcut, and deal with the self-processing. Second, the tool radius compensation algorithm with multi-segment NURBS trajectory is implemented. The focus of this part is the tool radius compensation of the trajectory transfer, and the trajectory transfer is divided into two types: the extension type and the shortened type. For the shortened type transfer, cross-processing is needed to avoid the overcut of workpiece at the transfer. When calculating the tool radius compensation of the shortened type, we not only need to find the intersection of the tool center trajectory of two adjacent NURBS curves, but also need to select the intersection we need when a number of intersections exist. For the extension type transfer, in order to ensure the continuity of the tool center trajectory, we need to extend the tool center trajectory or add arc-segment at the transfer. The proposed algorithm can automatically decide where to extend the tool center trajectory or add arc-segment to achieve the best efficiency. Finally, the algorithm can output the calculated NURBS tool center trajectory in the form of linear segment interpolation G code or NURBS interpolation G code according to the processing needs. Simulations on VERICUT and experiments on three-axis CNC machine tool shows the effectiveness and validation of the tool path compensation algorithm.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90315223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental comparison of the seizure loads of gray iron journal bearing and aluminum alloy journal bearing under aligned and misaligned conditions 灰口铸铁轴颈轴承与铝合金轴颈轴承对中与不对中载荷的实验比较

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020038

Xiuli Zhang, Z. Yin, Qin Dong, Jun Cao

引用次数: 1

Resonance track‐and‐dwell testing for crack length measurement on 304L stainless steel 304L不锈钢裂纹长度测量的共振轨迹和驻留测试

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020089

C. Gautrelet, L. Khalij, M. Machado

引用次数: 3

The influence of the shaft angle value on the normal stress and displacement repartition by bevel gear pairs − a TCA investigation 轴角值对锥齿轮副法向应力和位移重分配的影响- TCA研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/MECA/2020098

Sándor Bodzás

引用次数: 0

Design and anylysis of gamma type Stirling engine 伽玛型斯特林发动机的设计与分析

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020062

D. J. Vahid, Hojjat Danandeh Oskouei

引用次数: 1

Detection method of combustion oscillation characteristics under strong noise background 强噪声背景下燃烧振荡特性的检测方法

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020085

Yunkun Wei, Tianhong Zhang, Zhonglin Lin, Qiling Xie, Yan Zhang

{"title":"Detection method of combustion oscillation characteristics under strong noise background","authors":"Yunkun Wei, Tianhong Zhang, Zhonglin Lin, Qiling Xie, Yan Zhang","doi":"10.1051/meca/2020085","DOIUrl":"https://doi.org/10.1051/meca/2020085","url":null,"abstract":"After the lean fuel premixed combustion technology is applied to aero engines, severe combustion oscillations will be cased and led to hidden safety hazards such as engine vibration, further energy waste and other problems. Therefore, it is increasingly important to actively control combustion oscillations. In this paper, a multispectral radiation thermometry (MRT) is used to analyze the hydroxyl group, which is a measurable research object in the combustion chamber of an aero engine, and to fit the functional relationship between the radiation intensity ratio and the temperature in different bands. The theoretical value of the error is <2%. At the same time, in order to solve the problem of weak detection signal and excessive interference signal, an improved frequency domain filtering method based on fast Fourier transform is designed. Besides, the FPGA platform is used to ensure the real-time performance of the temperature measurement system, and simulations and experiments are performed. An oscillating signal with an oscillation frequency of 315 Hz is obtained on the established test platform, and the error is only 1.42%.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":"85 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85613360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A mixed PGD-a priori time basis strategy for the simulation of cyclic transient thermal behavior 循环瞬态热行为模拟的混合pgd -先验时基策略

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020082

A. A. Takash, M. Beringhier, M. Hammoud, J. Grandidier

引用次数: 0