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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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

An investigation on dynamic characteristics of herringbone planetary gear system with torsional flexibility between the left and right teeth of the sun gear 太阳齿轮左右齿间具有扭转柔度的人字行星齿轮系统动力学特性研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020074

X. Xu, Hongwei Ge, Jijun Deng, Jibo Wang, Renxiang Chen

{"title":"An investigation on dynamic characteristics of herringbone planetary gear system with torsional flexibility between the left and right teeth of the sun gear","authors":"X. Xu, Hongwei Ge, Jijun Deng, Jibo Wang, Renxiang Chen","doi":"10.1051/meca/2020074","DOIUrl":"https://doi.org/10.1051/meca/2020074","url":null,"abstract":"Herringbone planetary gear system (HPGS) has high power density and complex structure. The torsional flexibility of the left and right teeth of the sun gear is closely related to the dynamic characteristics of the HPGS. In this research, considering the coordination conditions of both sides torsional stiffness and axial slide of the sun gear, a new dynamic model of the HPGS considering the meshing phase difference between left and right teeth of the sun gear is developed based on the lumped-parameter method, and the influence mechanism of torsional stiffness and axial sliding is studied. Moreover, the dynamic parameters and dynamic characteristics of the HPGS are analyzed in the case of varying torsoinal stiffness and axial slide. The results show that the torsional stiffness of left and right teeth and the axial slide of sun gear have significant impacts on the dynamic parameters and dynamic mesh force response. With the increase of the torsional flexibility (the decrease the torsional stiffness), the sun gear and planet gear meshing stiffness and the maximum tooth surface load are both increased on the left side (input side) and decreased on the right side, but the main peak values and peak frequencies of dynamic response on both sides of the s-p meshing pairs decrease significantly. In addition, when the sun gear slides toward the output side axially, meshing stiffness and dynamic mesh force response main peak values decreased on the left side (input side) and increased on the right side, but the main resonance peaks frequencies keep the same.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72971279","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

Thermo-viscoplastic numerical modeling of metal forging process by Pseudo Inverse Approach 金属锻造过程的伪逆热粘塑性数值模拟

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020002

A. Thomas, B. Abbès, Yu Ming Li, F. Abbès, J. Duval

引用次数: 0

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

Effective factors on thermal conductivity of stochastic structures open cell metal foams 随机结构开孔金属泡沫导热系数的影响因素

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020028

M. Saljooghi, A. Raisi, Amir Farahbakhsh

{"title":"Effective factors on thermal conductivity of stochastic structures open cell metal foams","authors":"M. Saljooghi, A. Raisi, Amir Farahbakhsh","doi":"10.1051/meca/2020028","DOIUrl":"https://doi.org/10.1051/meca/2020028","url":null,"abstract":"Effective thermal conductivity (ETC) is a considerable thermo-physical property in design, manufacturing, and usage of multifunctional equipment that benefit cellular structures such as open-cell metal foams. An accurate understanding of key parameters effecting on ETC is classified by: Analytical, Numerical and Experimental approaches. In this study, a comprehensive investigation based on mentioned approaches is presented and a comparison between various factors affecting ETC including porosity, pore size, temperature, pressure and shape factor is made. Porosity and pore size, as main morphological features of open-cell metal foams, indicate structural characterization of them. Increase of porosity and pore size resulted decrease of ETC. The temperature effects on ETC in case of temperatures lower than 250 °C is ignorable although for temperature higher than 500 °C with change of heat transfer mechanism temperature plays a primary role in determining ETC. Few studies have been made on pressure parameter that illustrated its effect on ETC is insignificant. Multiple manufacturing methods produce different topological structures so; the influence of shape factor on ETC requires more efforts to reach a better understanding. Finally, applicable techniques for measuring ETC are briefly discussed.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84421100","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: 3

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":null,"pages":null},"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

Computer-aided design and loaded tooth contact analyses of bevel gear pair having straight teeth by different loaded torques 不同加载转矩下直齿锥齿轮副的计算机辅助设计及加载齿接触分析

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2019076

Sándor Bodzás

引用次数: 3

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