This article presents the use of a specially designed flat strip drawing tester in order to assess the change in surface topography of DC04 steel sheets. The flat strip drawing test simulates friction conditions in the sheet metal-blankholder interface during deep drawing processes. Experimental tests were carried out at various nominal pressures and in dry friction and lubricated conditions. Two widely available gear and engine oils were used in the study. It was found that, in the range of pressures investigated between 3 and 12 MPa, 80W-90 gear oil provided a greater reduction in the value of the coefficient of friction (COF) than 5W-30 engine oil. Gear oil reduced the COF by an average of about 13.4 [%]. The lubrication efficiency depends on the pressure values; the greater the pressure, the lower the lubrication efficiency. A lowering of the value of the main amplitude surface roughness parameters Sa and Sq was generally observed. SEM analysis showed that even under lubrication conditions there was intense flattening of the roughness asperities of the sheet metal.
{"title":"Analysis of the Friction Mechanisms of DC04 Steel Sheets in the Flat Strip Drawing Test","authors":"Marek Szewczyk, K. Szwajka","doi":"10.7862/rm.2022.4","DOIUrl":"https://doi.org/10.7862/rm.2022.4","url":null,"abstract":"This article presents the use of a specially designed flat strip drawing tester in order to assess the change in surface topography of DC04 steel sheets. The flat strip drawing test simulates friction conditions in the sheet metal-blankholder interface during deep drawing processes. Experimental tests were carried out at various nominal pressures and in dry friction and lubricated conditions. Two widely available gear and engine oils were used in the study. It was found that, in the range of pressures investigated between 3 and 12 MPa, 80W-90 gear oil provided a greater reduction in the value of the coefficient of friction (COF) than 5W-30 engine oil. Gear oil reduced the COF by an average of about 13.4 [%]. The lubrication efficiency depends on the pressure values; the greater the pressure, the lower the lubrication efficiency. A lowering of the value of the main amplitude surface roughness parameters Sa and Sq was generally observed. SEM analysis showed that even under lubrication conditions there was intense flattening of the roughness asperities of the sheet metal.","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123071593","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}
{"title":"SELECTED PROPERTIES OF BIOCOMPOSITES ON THE BASIS OF PHBV WITH CELLULOSE FILLERS","authors":"W. Frącz, G. Janowski","doi":"10.7862/rm.2018.38","DOIUrl":"https://doi.org/10.7862/rm.2018.38","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121077238","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}
M. Kuzinovski, M. Tomov, P. Cichosz, P. Karolczak, M. Kowalski, Marek Kołodziej, H. Skowronek, K. Waszczuk
{"title":"Analiza rozkładu sił działających na ostrze fazownika sprężystego","authors":"M. Kuzinovski, M. Tomov, P. Cichosz, P. Karolczak, M. Kowalski, Marek Kołodziej, H. Skowronek, K. Waszczuk","doi":"10.7862/RM.2017.31","DOIUrl":"https://doi.org/10.7862/RM.2017.31","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127159766","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}
{"title":"Modelowanie numeryczne odazotowania spalin metodą SCR","authors":"T. Chmielniak, Paweł Pilarz","doi":"10.7862/RM.2014.17","DOIUrl":"https://doi.org/10.7862/RM.2014.17","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127380494","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}
{"title":"Problemy implementacji systemu sterowania lotem na platformę systemu operacyjnego czasu rzeczywistego VxWorks","authors":"S. Samolej, T. Rogalski, D. Nowak","doi":"10.7862/RM.2013.46","DOIUrl":"https://doi.org/10.7862/RM.2013.46","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125124717","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}
P. Gil, R. Gałek, K. Kiedrzyński, Adrian Kmieciński
This article presents a passive air conditioning sy stem using the lower source of the ground heat pump. Passive air conditioning uses the natural cold accumulated in the ground especially in the summer season. A hydraulic diagra m and the principle of passive air conditioning were presented in the text . The purpose of the measurement was to determine the cooling power, the characteris tic temperatures and the soil temperature distribution at the depth of 2 meters at t he ground excavated site of the spiral ground heat exchanger. Annual temperature distribut ions in the ground which directly affect annular cooling power were presented. Advantages and disadvantages of passive air conditioning have also been presente d.
{"title":"Operational research of ground heat pump and passive air conditioning","authors":"P. Gil, R. Gałek, K. Kiedrzyński, Adrian Kmieciński","doi":"10.7862/RM.2018.12","DOIUrl":"https://doi.org/10.7862/RM.2018.12","url":null,"abstract":"This article presents a passive air conditioning sy stem using the lower source of the ground heat pump. Passive air conditioning uses the natural cold accumulated in the ground especially in the summer season. A hydraulic diagra m and the principle of passive air conditioning were presented in the text . The purpose of the measurement was to determine the cooling power, the characteris tic temperatures and the soil temperature distribution at the depth of 2 meters at t he ground excavated site of the spiral ground heat exchanger. Annual temperature distribut ions in the ground which directly affect annular cooling power were presented. Advantages and disadvantages of passive air conditioning have also been presente d.","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125178970","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}
In this paper a singularity robust trajectory gener ator for robotic manipulators is presented. The generator contains the procedure of sol ving the inverse kinematics problem. This issue is defined as an optimization probl em, where a genetic algorithm is used for optimizing the fitness function. In order to avoid singularity problem, the generator is based on the direct kinematics problem . The trajectory generator allows to obtain generalized coordinates, velocities and a ccelerations. Simulation results show that the procedure generates a trajectory of m anipulator even in kinematics singularities.
{"title":"SINGULARITY ROBUST TRAJECTORY GENERATOR FOR ROBOTIC MANIPULATOR BASED ON GENETIC ALGORITHM WITH DYNAMIC ENCODING OF SOLUTIONS","authors":"P. Gierlak","doi":"10.7862/RM.2018.40","DOIUrl":"https://doi.org/10.7862/RM.2018.40","url":null,"abstract":"In this paper a singularity robust trajectory gener ator for robotic manipulators is presented. The generator contains the procedure of sol ving the inverse kinematics problem. This issue is defined as an optimization probl em, where a genetic algorithm is used for optimizing the fitness function. In order to avoid singularity problem, the generator is based on the direct kinematics problem . The trajectory generator allows to obtain generalized coordinates, velocities and a ccelerations. Simulation results show that the procedure generates a trajectory of m anipulator even in kinematics singularities.","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125930972","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}
{"title":"Badania porównawcze wybranych właściwości ostrzy skrawających z kutych, walcowanych i spiekanych stali szybkotnących","authors":"M. Kupczyk, Jędrzej Komolka, M. Jenek","doi":"10.7862/RM.2017.30","DOIUrl":"https://doi.org/10.7862/RM.2017.30","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125955361","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}
{"title":"Analiza wydajności chłodniczej kaskadowego obiegu skraplania etylenu i stanu izolacji zbiorników ładunkowych podczas transportu ładunku na gazowcu LPG o pojemności 22500 m3","authors":"D. Nanowski","doi":"10.7862/RM.2014.25","DOIUrl":"https://doi.org/10.7862/RM.2014.25","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125444312","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}
{"title":"Koncepcja stanowiska do pomiarów współczynników wymiany masy/ciepła w mini-wymiennikach","authors":"S. Grosicki, R. Smusz, Joanna Wilk","doi":"10.7862/RM.2014.38","DOIUrl":"https://doi.org/10.7862/RM.2014.38","url":null,"abstract":"","PeriodicalId":288754,"journal":{"name":"Scientific Letters of Rzeszow University of Technology - Mechanics","volume":"156 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128750207","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}
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