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Bulletin of the Polytechnic Institute of Iași. Machine constructions Section最新文献

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High-Pressure Pumps Evolution and Wear Analysis Methods 高压泵的演变和磨损分析方法
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0019
R. Iordache, C. Bujoreanu
{"title":"High-Pressure Pumps Evolution and Wear Analysis Methods","authors":"R. Iordache, C. Bujoreanu","doi":"10.2478/bipcm-2022-0019","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0019","url":null,"abstract":"Abstract The wear analysis is a basic step for assessment of the functioning of mechanical systems and helps to the products improvement. The service life of the assemblies is approximate depending on the level of wear of their components. Starting from the product prototype phase, all components are tested and very carefully analyzed. This kind of analysis depends on the fault type and also the analysis devices are chosen in view of this. The Scanning Electron Microscope is one of the most used equipment which provides images with very good resolution at nanometers sizes. The classic microscopes are very often used for surface analysis or measurements. Hardness tester and adhesion measurements devices help to evaluate the material hardness and coatings adhesion. The improvement of the wear analysis methods is necessary due to continuing evolution of the materials and production processes. This paper presents the most common wear types from the injection high-pressure pumps and their analysis methods.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124787909","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
Modeling and Analysis of Thermal Behaviour for Brake Discs 制动盘热性能建模与分析
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0012
Cosmin Preda, R. Bleotu
{"title":"Modeling and Analysis of Thermal Behaviour for Brake Discs","authors":"Cosmin Preda, R. Bleotu","doi":"10.2478/bipcm-2022-0012","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0012","url":null,"abstract":"Abstract Focusing strictly to the braking assembly system, it is an important key factor for safety, does not matter if it can be found on cars, motorcycles, planes or bicycles. The principal aspect is to transform the energies that act on the system, which are kinetic and potential, then leads to a speed decrease of the vehicle until it stops. The purpose of this paper is to analyze five possible variants of the geometry of the brake disc, each geometry being different from the other. Because for a more efficient release of heat, the five chosen geometries of the discs have on their surface vanes, holes, in order to remove heat from their surface. For the actual making of the discs, the chosen models were made and designed in the CATIA V5 design program. The next step in this work was to perform analyzes and simulations for the selected disks. At the same time, the material chosen for them was considered. The 3D models were imported into the ANSYS analysis program, where individual analyzes were performed for each brake disc, and a comparison was made between the values of each one.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748139","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
Use of the Alternating Directions Method in Cylindrical Coordinates, Applied to the Two-Dimension Unsteady Conduction Heat Transfer 圆柱坐标系下交替方向法在二维非稳态传热中的应用
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0017
G. Tcaciuc, A G Lupu, B. Horbaniuc
{"title":"Use of the Alternating Directions Method in Cylindrical Coordinates, Applied to the Two-Dimension Unsteady Conduction Heat Transfer","authors":"G. Tcaciuc, A G Lupu, B. Horbaniuc","doi":"10.2478/bipcm-2022-0017","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0017","url":null,"abstract":"Abstract Finding analytical solutions for the unsteady conduction heat transfer equation is generally very difficult due to the intrinsic complexity of the problem. In most cases, the equation has no analytical solutions. A numerical approach that surmounts these difficulties consists of the finite difference technique. The alternate directions finite-difference technique especially suits to the two-dimension heat conduction. The paper considers a hollow cylinder consisting of a conduction heat transfer medium, and the two-direction unsteady heat propagation within this medium is studied by means of the alternate directions method. The approach simulates the heat conduction process during a charge-discharge cycle of a single borehole heat storage.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125438309","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
Study Upon Cylindrical Roller Bearing Profile Optimisation Using FEA 基于有限元分析的圆柱滚子轴承型线优化研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0018
I. Mehmet, D. Chitariu, C. Dumitraș
{"title":"Study Upon Cylindrical Roller Bearing Profile Optimisation Using FEA","authors":"I. Mehmet, D. Chitariu, C. Dumitraș","doi":"10.2478/bipcm-2022-0018","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0018","url":null,"abstract":"Abstract The bearings represent an important element in the mechanical structures, ensuring the proper functioning of the moving / dynamic elements. An important feature of the bearing is its durability, which is necessary for long-term use. This characteristic is influenced by the contact between the rolling element / ring and the rolling elements / balls or rollers. This paper proposes a comparative study of the influences of different types of cylindrical roller profiles proposed in the literature and by the author on the durability characteristic. There are 3 types of profiles, standard, Fujiwara and a profile calculated by the author based on the solid of equal strength.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129224637","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
Design and Execution of Demolition Works By Blasting of Industrial Constructions – Technical and Safety Aspects 工业建筑爆破拆除工程的设计和施工。技术和安全方面
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0020
R. László, Ciprian Jitea, Bogdan Garaliu, Aurelian Nicola, Levente Miklos
{"title":"Design and Execution of Demolition Works By Blasting of Industrial Constructions – Technical and Safety Aspects","authors":"R. László, Ciprian Jitea, Bogdan Garaliu, Aurelian Nicola, Levente Miklos","doi":"10.2478/bipcm-2022-0020","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0020","url":null,"abstract":"Abstract The paper describes the practical way and security conditions of realizing the demolition of an industrial chimney located in an oil refinery platform, having in the immediate vicinity sensitive equipment and constructions. The chimney has a height of 150 m and consists of the outer tubular structure of reinforced concrete and an inner chimney made of refractory brick masonry. In order to establish the possible secondary effects generated by the blasting works, a risk assessment was made with reference to seismic wave, air shock wave, noise, dust and the level of shock generated by the impact of chimney construction with the soil. The demolition work was carried out successfully and due to protection and safety measures no unwanted events were recorded, and the measured values of the seismic wave generated by the impact with the ground of the chimney were non-dangerous, being below the values estimated in the risk assessment.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446876","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
Considerations on Classification of the Main Components of the Vehicles By their Vibroacoustic Fingerprint 利用振动声指纹对车辆主要部件进行分类的思考
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0016
Nicolae-Adrian Niţu, C. Bujoreanu
{"title":"Considerations on Classification of the Main Components of the Vehicles By their Vibroacoustic Fingerprint","authors":"Nicolae-Adrian Niţu, C. Bujoreanu","doi":"10.2478/bipcm-2022-0016","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0016","url":null,"abstract":"Abstract The modern car industry is evolving under new premises, such as new propulsion technology, which imply offering to the customer the completed new solutions (charging station, service contract and remote diagnosis). Proven diagnostic technology is reaching its limits because is generally based on detecting the electrical faults and the mechanical, hydraulic and pneumatic failures have a slight degree of detection by this method. An alternative method of diagnosis could be the study of actual noise and vibration parameters of the main components of the vehicle subject to major faults and compare them to that specific to good status of operation. This paper deals with the classification of the main components of the vehicles by their vibroacoustic fingerprint. Those components of the vehicle grouped by vehicle category and their common patterns of vibroacoustic fingerprints must be permanently overseen and compare with those assigned to the status of good health for diagnosis.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129781150","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
Design Solutions for Large Size Ball Valves 大通径球阀的设计解决方案
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0014
Laurențiu-Ioan Ivancu, D. Popescu
{"title":"Design Solutions for Large Size Ball Valves","authors":"Laurențiu-Ioan Ivancu, D. Popescu","doi":"10.2478/bipcm-2022-0014","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0014","url":null,"abstract":"Abstract Development of sustainable cities requires safe and efficient pipeline networks for the transportation of fluids. Ball valves are usually used to start/stop the flow of liquids or gases in pipelines, because they generate low hydraulic losses when the valve is in fully open position and no leakage in fully closed position. They are highly recommended, when quick operation is needed in emergency situations. European Union and United States of America have implemented stringent laws to regulate the standards of small and medium size pipeline components. Design parameters may require large size valves that are not in the focus of the present standards and in this case, individual solutions are needed. In this work, a methodology to design ball valves that are not in the standardized series is step by step presented. The case study of a Trunnion ball valve with a 900 mm bore diameter is discussed. The standard API 6D/ ISO 14313 recommends design methods for valves with face-to-face dimension between flanges for diameters up to DN900, therefore the proposed methodology is original.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129899374","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
Study on the Implementation of Maintenance Policies in Industrial Engineering 工业工程中维修政策实施的研究
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0011
I. Crăciun, I. Mehmet, C. Dumitraș
{"title":"Study on the Implementation of Maintenance Policies in Industrial Engineering","authors":"I. Crăciun, I. Mehmet, C. Dumitraș","doi":"10.2478/bipcm-2022-0011","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0011","url":null,"abstract":"Abstract Maintenance is presented as the totality of some activities that have as objective the maintenance or restoration of an equipment in normal operating parameters. From an economic point of view, for all production costs, it is recommended to plan these costs, taking into account the costs necessary for equipment maintenance activities. The maintenance strategies that the company performs must follow certain standards, taking into account the maintenance policy that guides them and the chosen maintenance methods. Depending on the type of maintenance used in the factories, they can have a positive or negative impact on the company’s economy, caused by certain factors.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125845018","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
Vehicles Loads Influence on Box Girder Bridges 车辆荷载对箱梁桥的影响
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0013
A. Velniciuc, C. Bujoreanu
{"title":"Vehicles Loads Influence on Box Girder Bridges","authors":"A. Velniciuc, C. Bujoreanu","doi":"10.2478/bipcm-2022-0013","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0013","url":null,"abstract":"Abstract Box girders bridges are widely used in modern highway systems because of their efficiency and attractive appearance. Vehicles loads represent one of the mainly factors that influence the structure reliability of the box girders bridges. Calculation of bridge resistance with different stress due to vehicles loads as close as possible to the real ones constitute the premise of a correct design of the structure. The goal of this study is to realize a description regarding the behavior of box girders bridges analyzed under different vehicles loads conditions. Nowadays the finite element methods (FEM) are highly used because of their capacity to simulate and evaluate the structure efficiency of bridges. By highlighting where the maximum stress values appear we will help the constructor to avoid dangerous sections. Based on this study, we will outline future research directions, aiming to identify and improve the mechanical and strength characteristics of box girders bridges.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126390989","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
A Review on Treating Tribological Problems with Fractals 用分形处理摩擦学问题综述
Bulletin of the Polytechnic Institute of Iași. Machine constructions Section Pub Date : 2022-06-01 DOI: 10.2478/bipcm-2022-0015
A. Lăpuşteanu, V. Paleu
{"title":"A Review on Treating Tribological Problems with Fractals","authors":"A. Lăpuşteanu, V. Paleu","doi":"10.2478/bipcm-2022-0015","DOIUrl":"https://doi.org/10.2478/bipcm-2022-0015","url":null,"abstract":"Abstract Fractals and chaos theory provide means of modeling dynamic changes in micro and nano topography on friction surfaces caused by various tribological mechanisms and processes. Friction and wear phenomena in tribological systems can be interpreted on a macroscopic scale. With the development of miniaturized scale and nanoscale systems, it has been launched the hypothesis that macro-level systems cannot reflect the microscale and nanoscale phenomena. A conclusive case is given by the calculation of frictional torque in microscale orientation, in this situation being found that models created by bearing producers cannot validate experimental results. By applying the “box-counting” method, it is possible to estimate the fractal dimension both directly and indirectly by comparing the area-perimeter-scale relations. Based on scaling equations, a system was created for this operation. The conclusion is that all existing theories in tribology should be adapted to take into account fractal size and fractal roughness.","PeriodicalId":244525,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Machine constructions Section","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127094453","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
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