Keywords: This article presents a control algorithm that solves the problem of motion synchronization for a system of three electro-hydraulic drives. The designed control system takes into account not only position errors for individual drive axes, but also synchronization errors with neighboring axes. The synchronization function for the control system, which takes into account the positioning errors of individual drive axes was specified. Experimental results on a 3-cylinder system were presented to verify the effectiveness of the proposed approach.
{"title":"MOTION SYNCHRONIZATION FOR ELECTRO-HYDRAULIC SERVO-DRIVES","authors":"P. Woś, R. Dindorf","doi":"10.21495/71-0-407","DOIUrl":"https://doi.org/10.21495/71-0-407","url":null,"abstract":"Keywords: This article presents a control algorithm that solves the problem of motion synchronization for a system of three electro-hydraulic drives. The designed control system takes into account not only position errors for individual drive axes, but also synchronization errors with neighboring axes. The synchronization function for the control system, which takes into account the positioning errors of individual drive axes was specified. Experimental results on a 3-cylinder system were presented to verify the effectiveness of the proposed approach.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127990287","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":"BEHAVIOUR OF EXTENDED BACKLASH BASED DRY FRICTION MODEL IN SIMULINK IN COMPARISON WITH DAHL AND LUGRE MODELS","authors":"P. Šnábl, L. Pešek, L. Pust","doi":"10.21495/71-0-359","DOIUrl":"https://doi.org/10.21495/71-0-359","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115489309","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":"INFLUENCE OF PARTICLE CONCENTRATION OF AL2O3 NANOFLUID ON THERMAL PERFORMANCE OF THE TWO PHASE NATURAL CIRCULATION LOOP","authors":"S. Sudheer, K.Kiran Kumar, K. Balasubramanian","doi":"10.21495/71-0-347","DOIUrl":"https://doi.org/10.21495/71-0-347","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127079184","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}
The work concerns the analysis of a material solution on an aramid laminate reinforced with additional composite layers loaded with ballistic impact from the 7.62 mm M43 Full Metal Jacket (FMJ). The aim of the study is to identify alternative material systems to the reference 4 mm thick Armox A500T armored steel solution. The research was carried out using the finite element method with the application of the ABAQUS program. The optimal solutions for individual material systems were generated based on numerical analyses, thereby classifying them according to the mass-efficiency criterion. The numerical results obtained were validated in a ballistic experiment on samples made according to the methodology adopted for modeling. The range of absorbed energy and residual energy was determined for material systems based on the assumptions of the Recht-Ipson model.
这项工作涉及分析芳纶层压板上的材料溶液，该层压板带有附加的复合材料层，这些复合材料层受到7.62 mm M43全金属护套(FMJ)的弹道冲击。该研究的目的是确定替代4毫米厚Armox A500T装甲钢解决方案的材料系统。采用有限元方法，应用ABAQUS程序进行研究。在数值分析的基础上，生成了各个材料系统的最优解，从而根据质量效率准则对其进行分类。根据所采用的建模方法对样品进行了弹道试验，验证了数值计算结果。根据Recht-Ipson模型的假设，确定了材料体系的吸收能和剩余能的范围。
{"title":"NUMERICAL ANALYSIS OF ENERGY ABSORPTION BY SANDWICH PANELS ON THE ARAMID FIBER BACKING","authors":"M. Bocian, K. Jamroziak, D. Pyka, E. Babej","doi":"10.21495/71-0-53","DOIUrl":"https://doi.org/10.21495/71-0-53","url":null,"abstract":"The work concerns the analysis of a material solution on an aramid laminate reinforced with additional composite layers loaded with ballistic impact from the 7.62 mm M43 Full Metal Jacket (FMJ). The aim of the study is to identify alternative material systems to the reference 4 mm thick Armox A500T armored steel solution. The research was carried out using the finite element method with the application of the ABAQUS program. The optimal solutions for individual material systems were generated based on numerical analyses, thereby classifying them according to the mass-efficiency criterion. The numerical results obtained were validated in a ballistic experiment on samples made according to the methodology adopted for modeling. The range of absorbed energy and residual energy was determined for material systems based on the assumptions of the Recht-Ipson model.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125868837","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}
R. Kolman, J. Kopačka, A. Tkachuk, D. Gabriel, J. González
In this contribution, a stabilization technique for finite element modelling of contact-impact problems based on the bipenalty method and the explicit predictor-corrector time integration is presented. The penalty method is a standard method for enforced contact constrains in dynamic problems. This method is easily implemented but the solution depends on numerical value of the stiffness penalty parameter and also the stability limit for explicit time integration is effected by a choice of this parameter. The bipenalty method is based on penalized not only stiffness term but also mass term concurrently. By this technique with a special ratio of mass and stiffness penalty parameters, the stability limit of contact-free problem is preserved. In this contribution, we also present a modification of the explicit time scheme based on predictor-corrector form. By meaning of this approach, spurious contact oscillations are eliminated and the results do not depend on numerical parameters.
{"title":"BI-PENALTY STABILIZED EXPLICIT FINITE ELEMENT ALGORITHM FOR ONE-DIMENSIONAL CONTACT-IMPACT PROBLEMS","authors":"R. Kolman, J. Kopačka, A. Tkachuk, D. Gabriel, J. González","doi":"10.21495/71-0-185","DOIUrl":"https://doi.org/10.21495/71-0-185","url":null,"abstract":"In this contribution, a stabilization technique for finite element modelling of contact-impact problems based on the bipenalty method and the explicit predictor-corrector time integration is presented. The penalty method is a standard method for enforced contact constrains in dynamic problems. This method is easily implemented but the solution depends on numerical value of the stiffness penalty parameter and also the stability limit for explicit time integration is effected by a choice of this parameter. The bipenalty method is based on penalized not only stiffness term but also mass term concurrently. By this technique with a special ratio of mass and stiffness penalty parameters, the stability limit of contact-free problem is preserved. In this contribution, we also present a modification of the explicit time scheme based on predictor-corrector form. By meaning of this approach, spurious contact oscillations are eliminated and the results do not depend on numerical parameters.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127492420","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":"LOCAL STABILIZATION OF THE QUASIPERIODIC RESPONSE OF THE GENERALIZED VAN DER POL OSCILLATOR","authors":"C. Fischer, J. Náprstek","doi":"10.21495/71-0-105","DOIUrl":"https://doi.org/10.21495/71-0-105","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124481253","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, an implementation of Split Hopkinson Pressure Bar (SHPB) and its modification Open Hopkinson Pressure Bar (OHPB) for testing of cellular structures is presented. Dynamic testing of materials with low mechanical impedance is very demanding in terms of achieving the requested experimental device performance. Key elements of the Hopkinson bar instrumentation that were successfully employed in dynamic testing of cellular materials are presented in this paper. Detailed overview of the strain-gauges instrumentation including our best practices for installation and noise reduction is provided. Information about the instrumentation of Hopkinson bar with high-speed cameras are also given. To demonstrate the performance of the proposed instrumentation some examples of a typical results are summarized in the text.
{"title":"OPTIMIZATION OF HOPKINSON BAR INSTRUMENTATION FOR TESTING OF CELLULAR AND LOW IMPEDANCE MATERIALS","authors":"J. Falta, T. Fíla, M. Adorna, P. Zlámal","doi":"10.21495/71-0-97","DOIUrl":"https://doi.org/10.21495/71-0-97","url":null,"abstract":"In this paper, an implementation of Split Hopkinson Pressure Bar (SHPB) and its modification Open Hopkinson Pressure Bar (OHPB) for testing of cellular structures is presented. Dynamic testing of materials with low mechanical impedance is very demanding in terms of achieving the requested experimental device performance. Key elements of the Hopkinson bar instrumentation that were successfully employed in dynamic testing of cellular materials are presented in this paper. Detailed overview of the strain-gauges instrumentation including our best practices for installation and noise reduction is provided. Information about the instrumentation of Hopkinson bar with high-speed cameras are also given. To demonstrate the performance of the proposed instrumentation some examples of a typical results are summarized in the text.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122004774","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":"TEMPORAL-SPATIAL DISPERSION ANALYSIS OF FINITE ELEMENT METHOD IN IMPLICIT TIME INTEGRATION","authors":"A. Kruisová, R. Kolman, M. Mracko, M. Okrouhlík","doi":"10.21495/71-0-215","DOIUrl":"https://doi.org/10.21495/71-0-215","url":null,"abstract":"","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126453136","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}
The article presents the results of research on vibroacoustic disturbances registered on UAV (Unmanned Aerial Vehicle) occurring in real conditions of shock wave measurement by an acoustic locator mounted on the aircraft wing. The attention was focused on determining the parameters of disturbances affecting the process of detecting and determining the coordinates of artillery projectiles flying at supersonic speeds. The main emphasis was placed on characterizing, investigating and analyzing disturbances in the form of acoustic noise and vibration of the UAV structure.
{"title":"RESEARCH OF VIBROACOUSTIC INTERFERENCE OCCURRING ON UAV","authors":"S. Grzywiński, S. Żygadło","doi":"10.21495/71-0-137","DOIUrl":"https://doi.org/10.21495/71-0-137","url":null,"abstract":"The article presents the results of research on vibroacoustic disturbances registered on UAV (Unmanned Aerial Vehicle) occurring in real conditions of shock wave measurement by an acoustic locator mounted on the aircraft wing. The attention was focused on determining the parameters of disturbances affecting the process of detecting and determining the coordinates of artillery projectiles flying at supersonic speeds. The main emphasis was placed on characterizing, investigating and analyzing disturbances in the form of acoustic noise and vibration of the UAV structure.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131747760","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}
K. Šimečková, K. Frydrýšek, V. Machalla, J. Demel, L. Pleva, V. Bajtek
: This article focuses on a fixative implant, namely a headless (Herbert) screw, designed for minimally invasive osteosynthesis of the 5 th metatarsus. An original experiment is conducted in which the axial compression forces applied to the headless screw are measured and evaluated during osteosynthesis of the bone fragment in the laboratory. The information gathered fills in gaps in the knowledge of the measured quantities. The results of the experiment that have been made on porcine bones are compared with calculations using an analytical solution of a statically indeterminate task in compression.
{"title":"OSTEOSYNTHESIS OF THE FRACTURED FIFTH METATARSUS WITH HEADLESS SCREW","authors":"K. Šimečková, K. Frydrýšek, V. Machalla, J. Demel, L. Pleva, V. Bajtek","doi":"10.21495/71-0-355","DOIUrl":"https://doi.org/10.21495/71-0-355","url":null,"abstract":": This article focuses on a fixative implant, namely a headless (Herbert) screw, designed for minimally invasive osteosynthesis of the 5 th metatarsus. An original experiment is conducted in which the axial compression forces applied to the headless screw are measured and evaluated during osteosynthesis of the bone fragment in the laboratory. The information gathered fills in gaps in the knowledge of the measured quantities. The results of the experiment that have been made on porcine bones are compared with calculations using an analytical solution of a statically indeterminate task in compression.","PeriodicalId":197313,"journal":{"name":"Engineering Mechanics 2019","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130479046","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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