Mechanics & Industry最新文献_第10页

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

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

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":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":"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

An inverse analysis to identify the Johnson-Cook constitutive model parameters for cold wire drawing process 冷拔过程Johnson-Cook本构模型参数的反演分析

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020070

A. Aghdami, B. Davoodi

{"title":"An inverse analysis to identify the Johnson-Cook constitutive model parameters for cold wire drawing process","authors":"A. Aghdami, B. Davoodi","doi":"10.1051/meca/2020070","DOIUrl":"https://doi.org/10.1051/meca/2020070","url":null,"abstract":"Johnson-Cook constitutive equation was utilized to model the 10100 copper and AA 1100 aluminum wires at the cold wire drawing process. Initial Johnson cook parameters were determined through quasi-static tensile tests at different strain rates. Analytical and finite element with VUHARD subroutine solutions were implemented to calculate the drawing forces using the Johnson cook parameters. Wire drawing experiments were carried out at different drawing conditions with two areal reductions and four drawing speeds with the strain rate ranged from 37 s−1 to 115 s−1 and wire drawing forces were measured using a load cell connected to the drawing die. Results showed that the Johnson cook model with parameters determined from a quasi-static condition was not able to predict the material behavior at the wire drawing process with a moderate strain rate. In order to modify the initial JC parameters an inverse analysis approach was adopted. An objective function was defined based on analytical and experimental drawing forces differences with respect to JC parameters. Using the Newton–Raphson method, new JC parameters were identified by minimizing the objective function. Updated Johnson cook parameters showed much more correlation with experimental results.","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":"76838617","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

Kinematic design of a hybrid planar-tripod mechanism for bone reduction surgery 骨复位手术中平面-三脚架混合机构的运动学设计

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020030

T. Essomba, Sinh Nguyen Phu

{"title":"Kinematic design of a hybrid planar-tripod mechanism for bone reduction surgery","authors":"T. Essomba, Sinh Nguyen Phu","doi":"10.1051/meca/2020030","DOIUrl":"https://doi.org/10.1051/meca/2020030","url":null,"abstract":"In the most severe cases of longitudinal bone fractures such as femur, tibias, humerus etc., the bone can be completely separated into two fragments. In order to guarantee the re-ossification of the bone, it is required to reposition the bone fragments together. This process requires a delicate surgery called “bone reduction surgery”. The most advanced technique relies on the use of a robotic manipulator to reposition the bone fragments with higher precision and stability than manual surgeries. The present work introduces the kinematic design of a new hybrid mechanical architecture to perform this task. It is composed of a 3-PRP planar mechanism attached with a 3-RPS tripod mechanism. The kinematic analysis of this mechanism is provided while taking account the tripod parasitic motion. Kinematic simulations using Matlab and Adams are performed to validate the kinematic and velocity models and the parasitic motion compensation provided by the planar mechanism. The workspace of this hybrid mechanism is then compared to the standard hexapod mechanism that is widely used in bone reduction surgery. It reveals that the proposed mechanism can generate a larger workspace with the same linkage dimensions.","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":"77972270","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

Rotational speed control of magnetic coupling with variable damping method 变阻尼磁联轴器转速控制方法

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020027

Z. Jian, L. Kun

引用次数: 0

Effects of process parameters on tensile strength of friction stir welded Al-Cu double-layer sheets 工艺参数对铝铜双层搅拌摩擦焊板抗拉强度的影响

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020059

M. Tabrizi, A. Mostahsan, M. Sedighi

{"title":"Effects of process parameters on tensile strength of friction stir welded Al-Cu double-layer sheets","authors":"M. Tabrizi, A. Mostahsan, M. Sedighi","doi":"10.1051/meca/2020059","DOIUrl":"https://doi.org/10.1051/meca/2020059","url":null,"abstract":"In this paper, friction stir welding (FSW) process was used to join double-layer sheets of pure copper and 1050 aluminum alloy produced by explosive welding (EXW). The double-layer sheets were arranged side by side to perform friction stir butt-welding. In this regard, rotary FSW tools with different geometries were used at rotational speeds of 800 and 1250 rpm and linear speeds of 8, 12, and 20 mm min‑1, in one and two number of passes. According to the results, the sample welded by a conical tool with a rotational speed of 800 rpm and a linear speed of 12 mm min‑1 in one pass offered the highest tensile strength, which was approximately equivalent to the 84% of the strength of the raw double-layer sheet. In addition, applying the second FSW pass and using a threaded tool from the aluminum side had negative effects on the tensile strength. The microstructural evaluation showed the presence of more intermetallic phases including Al4Cu9, AlCu, and Al2Cu in the sample welded by the threaded tool from the aluminum side in two number of passes, which was the responsible of the lower tensile strength and the higher microhardness.","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":"73193120","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: 2

An investigation of cutting parameters effect on sound level, surface roughness, and power consumption during machining of hardened AISI 4140 研究了淬火aisi4140加工过程中切削参数对声级、表面粗糙度和能耗的影响

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020068

Abidin Şahinoğlu, Efehan Ulas

{"title":"An investigation of cutting parameters effect on sound level, surface roughness, and power consumption during machining of hardened AISI 4140","authors":"Abidin Şahinoğlu, Efehan Ulas","doi":"10.1051/meca/2020068","DOIUrl":"https://doi.org/10.1051/meca/2020068","url":null,"abstract":"In recent years, the necessity for energy in the manufacturing industry has become an important problem because fossil fuel reserves are decreasing in order to produce energy. Therefore, the efficient use of energy has become an important research topic. In this study, energy efficiency is investigated in detail for sustainable life and manufacturing. AISI 4140 material with high hardness of 50 HRC hardness has been applied cryogenic process to improve mechanical and machinability properties. In this experiment study, the effects of feed rate (0.04, 0.08, 0.12 mm/rev), cutting speed (140, 160, 180 m/min), depth of cut (0.05, 0.10, 0.15 mm) and tool radius (0.4, 0.8) on energy consumption, surface roughness and sound intensity were investigated. Then, a new mathematical model with high accuracy was developed. Total power consumption was calculated by considering the instantaneous current value and machining time. As a result, it is found that good surface quality obtained when the feed rate is low, and the tool radius is high and the machining time is shortened, the energy consumption is reduced due to the increase in cutting speed, depth of cut and feed rate. Also, it is found that the tool radius has a limited effect on energy consumption, but low feed value increases energy consumption.","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":"73691785","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: 11

Investigation on hard turning temperature under a novel pulsating MQL environment: An experimental and modelling approach 新型脉动MQL环境下硬车削温度的实验与建模方法研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2020-01-01 DOI: 10.1051/meca/2020078

S. Roy, Ramanuj Kumar, A. Sahoo, A. Pandey, A. Panda

{"title":"Investigation on hard turning temperature under a novel pulsating MQL environment: An experimental and modelling approach","authors":"S. Roy, Ramanuj Kumar, A. Sahoo, A. Pandey, A. Panda","doi":"10.1051/meca/2020078","DOIUrl":"https://doi.org/10.1051/meca/2020078","url":null,"abstract":"Generation of total heat in hard turning largely influenced the cutting tool wear, tool life and finishing quality of work-surface. Thus, the measurement of this heat in terms of temperature becomes a necessity for achieving favourable machining performances. Therefore, this work presents a novel study on temperature measurement in three different zones during hard turning operation of 4340 grade steel under pulsating MQL environment. Temperatures are measured at three different locations namely chip-tool interface, flank face, and machined work surface (near to tool-work contact) and the location wise temperature is termed as chip tool interface temperature (T), flank face temperature (Tf) and machined work surface temperature (Tw) correspondingly. The temperature T and Tf are measured with help of K-type thermocouple while Tw is measured by Fluke make infra-red thermal camera. Pulsating MQL significantly reduced the temperature as the maximum temperature is noticed 110 °C which corresponds to chip-tool interface temperature (T) at highest speed (200 m/min) condition. In each test, the order of temperature follow the trend as: T > Tf > Tw. Considering average of all 16 temperatures, T is 14.42% greater than Tf and 39.36% larger than Tw while Tf is 21.79% greater than Tw. Experimental results concludes that the cutting speed is the most influencing factor followed by depth of cut for both T and Tf, whereas depth of cut is the most influencing factor for Tw. Further, these temperatures are predicted using linear regression, and absolute mean error (MAE) for responses T, Tf, and Tw is noticed as 1.848%, 0.542%, and 3.766% individually. Additionally, the optimum setting of input terms are estimated using WPCA (weighted principal component analysis) and found to be dc1 (0.1 mm) − fr2 (0.08 mm/rev) − vc2 (100 m/min) − Pt2 (2 s).","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":"72438692","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: 8