Pub Date : 2024-04-01DOI: 10.12913/22998624/184339
R. Dębkowski, M. Gołąbczak
Stationary multi-point diamond dressers are an economical alternative to single-point dressers. However, when using them, it is necessary to keep in mind the different way of shaping the surface topography of the wheel being dressed. During one dressing pass, the grinding wheel is affected by several diamonds fixed at specific distances on the dresser surface. The simulation studies presented in the paper showed that, depending on the dressing feed and the distance and active width of the diamonds, the overlap of their motion paths is not the same over the entire grinding wheel surface, as is the case when single-point dressers are used - the grinding wheel surface consists of areas shaped with different overlap ratios. Taking into account the results of simulation studies, formulas were proposed for calculating two new indicators to supervise the dressing process with stationary multi-point dressers. Experimental dressing tests using new indicators and the evaluation of the vitrified grinding wheel topography confirmed the usefulness of using the new indicators and the inhomogeneity of the grinding wheel surface topog - raphy, resulting from the different overlapping of the motion paths of individual dresser diamonds.
{"title":"Shaping the Topography of the Active Surface of a Ceramic Grinding Wheel with a Stationary Multi-Point Diamond Dresser","authors":"R. Dębkowski, M. Gołąbczak","doi":"10.12913/22998624/184339","DOIUrl":"https://doi.org/10.12913/22998624/184339","url":null,"abstract":"Stationary multi-point diamond dressers are an economical alternative to single-point dressers. However, when using them, it is necessary to keep in mind the different way of shaping the surface topography of the wheel being dressed. During one dressing pass, the grinding wheel is affected by several diamonds fixed at specific distances on the dresser surface. The simulation studies presented in the paper showed that, depending on the dressing feed and the distance and active width of the diamonds, the overlap of their motion paths is not the same over the entire grinding wheel surface, as is the case when single-point dressers are used - the grinding wheel surface consists of areas shaped with different overlap ratios. Taking into account the results of simulation studies, formulas were proposed for calculating two new indicators to supervise the dressing process with stationary multi-point dressers. Experimental dressing tests using new indicators and the evaluation of the vitrified grinding wheel topography confirmed the usefulness of using the new indicators and the inhomogeneity of the grinding wheel surface topog - raphy, resulting from the different overlapping of the motion paths of individual dresser diamonds.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"9 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140352852","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/184340
Satyanarayana Addala, I.E.S. Naidu
This paper proposes the modeling and economic analysis of proton exchange membrane type fuel cells. Fuel cells (FC) are electrochemical devices that convert chemical energy into electrical energy. FC offers clean and effective energy production and it undergoes rigorous growth by numerous manufacturers with different applications. FC is a promising new technology for the generation of electrical energy. This technology contains hydrogen and oxygen to produce electrical energy through the electrochemical process. A mathematical model of an FC is developed which shows the cathode and anode, output voltage, and economic analysis of the fuel cells. The simulation results of the fuel cell for a suitable converter controller are proposed in Matlab 2021b software.
{"title":"Modeling and Analysis of Fuel Cell Power Generation System Using Proportional Integral Speed Controller","authors":"Satyanarayana Addala, I.E.S. Naidu","doi":"10.12913/22998624/184340","DOIUrl":"https://doi.org/10.12913/22998624/184340","url":null,"abstract":"This paper proposes the modeling and economic analysis of proton exchange membrane type fuel cells. Fuel cells (FC) are electrochemical devices that convert chemical energy into electrical energy. FC offers clean and effective energy production and it undergoes rigorous growth by numerous manufacturers with different applications. FC is a promising new technology for the generation of electrical energy. This technology contains hydrogen and oxygen to produce electrical energy through the electrochemical process. A mathematical model of an FC is developed which shows the cathode and anode, output voltage, and economic analysis of the fuel cells. The simulation results of the fuel cell for a suitable converter controller are proposed in Matlab 2021b software.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"1 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140354310","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/185164
J. Kowalczyk, M. Madej, Katarzyna Piotrowska, K. Radoń-Kobus
This paper investigates the effect of the type of movement on the tribological properties of an AlTiN coating ap - plied to a disc made of HS6-5-2C steel. Tribological tests were carried out with a tribometer operating on a ball-disc friction apparatus moving in to-and-from as well as in rotary motion. The tests were carried out under technically dry friction conditions, subject to the application of a cutting fluid used during machining in grinding, turning, mill - ing, drilling and cutting processes. A scanning microscope was used to observe the morphology of the surface, the morphology of the AlTiN coating, and to determine its chemical composition and assess wear mechanisms. The topography of the surface was analysed before and after carrying out the friction and wear tests using a confocal microscope with interferometric mode. The results of the provided tests indicate that the cutting fluid used in the tests reduced the coefficient of friction in both rotary and the sliding – reciprocating motion about 75% and 65% respectively. It has also contributed to a reduction in linear wear in the sliding – reciprocating motion about 22%. In case of rotary motion, higher values of linear wear about 40% were recorded, due to wear of the counterspecimen.
{"title":"The Impact of a Movement Type on Tribological Properties of AlTiN Coating Deposited on HS6-5-2C Steel","authors":"J. Kowalczyk, M. Madej, Katarzyna Piotrowska, K. Radoń-Kobus","doi":"10.12913/22998624/185164","DOIUrl":"https://doi.org/10.12913/22998624/185164","url":null,"abstract":"This paper investigates the effect of the type of movement on the tribological properties of an AlTiN coating ap - plied to a disc made of HS6-5-2C steel. Tribological tests were carried out with a tribometer operating on a ball-disc friction apparatus moving in to-and-from as well as in rotary motion. The tests were carried out under technically dry friction conditions, subject to the application of a cutting fluid used during machining in grinding, turning, mill - ing, drilling and cutting processes. A scanning microscope was used to observe the morphology of the surface, the morphology of the AlTiN coating, and to determine its chemical composition and assess wear mechanisms. The topography of the surface was analysed before and after carrying out the friction and wear tests using a confocal microscope with interferometric mode. The results of the provided tests indicate that the cutting fluid used in the tests reduced the coefficient of friction in both rotary and the sliding – reciprocating motion about 75% and 65% respectively. It has also contributed to a reduction in linear wear in the sliding – reciprocating motion about 22%. In case of rotary motion, higher values of linear wear about 40% were recorded, due to wear of the counterspecimen.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"60 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140356520","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/185409
Nawar Fahem, Ali Haleem, Samir Awad
{"title":"Modification of Microstructure and Surface Properties of Ti-6Al-4V Alloy by MoSi2 Particles Using Micro-Arc Oxidation Process","authors":"Nawar Fahem, Ali Haleem, Samir Awad","doi":"10.12913/22998624/185409","DOIUrl":"https://doi.org/10.12913/22998624/185409","url":null,"abstract":"","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"11 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140353141","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/183569
Artur Babiarz, R. Bieda, Tomasz Grzejszczak, Krzysztof Jaskot, Andrzej Kozyra, Piotr Sciegienka
Controlling a remotely operated underwater vehicle (ROV) is an extremely challenging task that requires precise maneuvering and navigation in complex as well as often unpredictable environments. The operator faces numer - ous difficulties, including limited visibility and communication constraints, in addition to the need to interpret data from various sensors. This paper describes a method for calibration of a wearable system equipped with inertial measurement unit (IMU) sensors that control the underwater manipulators. To implement a solution that allows the robot to be controlled by the operator’s hand movements, it is necessary to measure the movement of the arm. This task is carried out using the IMU sensors, which are mounted in appropriate places on the ROV operator’s suit to allow mapping the movement of his/her upper limbs. These movements are transferred to the manipulator’s arms on the ROV, making it possible to interact with the environment by – manipulating objects under-water.
{"title":"Underwater Human Arm Manipulator – System Calibration","authors":"Artur Babiarz, R. Bieda, Tomasz Grzejszczak, Krzysztof Jaskot, Andrzej Kozyra, Piotr Sciegienka","doi":"10.12913/22998624/183569","DOIUrl":"https://doi.org/10.12913/22998624/183569","url":null,"abstract":"Controlling a remotely operated underwater vehicle (ROV) is an extremely challenging task that requires precise maneuvering and navigation in complex as well as often unpredictable environments. The operator faces numer - ous difficulties, including limited visibility and communication constraints, in addition to the need to interpret data from various sensors. This paper describes a method for calibration of a wearable system equipped with inertial measurement unit (IMU) sensors that control the underwater manipulators. To implement a solution that allows the robot to be controlled by the operator’s hand movements, it is necessary to measure the movement of the arm. This task is carried out using the IMU sensors, which are mounted in appropriate places on the ROV operator’s suit to allow mapping the movement of his/her upper limbs. These movements are transferred to the manipulator’s arms on the ROV, making it possible to interact with the environment by – manipulating objects under-water.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"193 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140768688","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/183793
D. Stepanenko, Jacek Rudnicki, Zbigniew Kneba
In the presented research, the authors dealt with the specific properties of the combustion process of dimethyl ether (DME) in a combustion car (Volkswagen Golf IV) engine AJM 1.9 TDI PDE made by Volkswagen factory. Dimeth-yl ether is an alternative fuel produced most often from natural gas, which can be used in compression ignition engines as a single fuel or co-burned with diesel oil. This work describes the impacts of using exhaust gas recirculation (EGR) system and various diesel to DME substitution ratios from 0% to approximately 25% (on an energy basis), on the combustion process in a dual-fuel diesel engine. The engine has been modified so that DME fuel is introduced into the intake manifold just before the intake valves. The diesel fuel supply system, operation algorithms of the engine electronic control unit and other engine elements were left unchanged as it was built by the manufacturer.
{"title":"Impacts of Using Exhaust Gas Recirculation and Various Amount of Dimethyl Ether Premixed Ratios on Combustion and Emissions on a Dual-Fuel Compression Ignition Engine","authors":"D. Stepanenko, Jacek Rudnicki, Zbigniew Kneba","doi":"10.12913/22998624/183793","DOIUrl":"https://doi.org/10.12913/22998624/183793","url":null,"abstract":"In the presented research, the authors dealt with the specific properties of the combustion process of dimethyl ether (DME) in a combustion car (Volkswagen Golf IV) engine AJM 1.9 TDI PDE made by Volkswagen factory. Dimeth-yl ether is an alternative fuel produced most often from natural gas, which can be used in compression ignition engines as a single fuel or co-burned with diesel oil. This work describes the impacts of using exhaust gas recirculation (EGR) system and various diesel to DME substitution ratios from 0% to approximately 25% (on an energy basis), on the combustion process in a dual-fuel diesel engine. The engine has been modified so that DME fuel is introduced into the intake manifold just before the intake valves. The diesel fuel supply system, operation algorithms of the engine electronic control unit and other engine elements were left unchanged as it was built by the manufacturer.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"8 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140353012","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/185270
Turki Alotibi, Waleed Shirbeeny, Ahmed Alshahrie, Mohammed Aida, Jawid Iqbal
Due to its strong affinity for chlorine gas, Cd can potentially form CdCl 2 . Cd-doped CuO thin films are sensitive to chlorine gas, as careful inclusion of Cd in the CuO crystal structure modifies the energy gap depending on the dop - ant concentration. We employed spray pyrolysis to deposit Cd-doped CuO on fluorine tin oxide (FTO) while heat - ing the substrate to 500 °C. The X-ray diffraction (XRD) analysis revealed that Cd was interstitially incorporated in the CuO lattice structure, as verified by scanning electron microscopy (SEM) imaging. The photoluminescence study demonstrated that increasing the Cd concentration in CuO resulted in higher emission intensity, providing valuable insights into Cu 2+ and O 2-energy levels. Exposing a Cd-doped CuO thin film to chlorine gas modifies the bandgap, depending on the Cd concentration. The fluctuation in the bandgap energy of copper oxide doped with cadmium indicates the chlorine gas concentration nearby. Time-resolved measurements for the I-V characteristics of the thin film revealed considerable current variation during the exposure to chlorine gas.
由于镉对氯气有很强的亲和力，因此有可能形成 CdCl 2。掺杂镉的氧化铜薄膜对氯气很敏感，因为掺杂镉的氧化铜晶体结构会根据掺杂浓度改变能隙。我们采用喷雾热解方法在氟锡氧化物（FTO）上沉积掺杂镉的氧化铜，同时将基底加热到 500 °C。X 射线衍射（XRD）分析表明，镉被间隙掺入到氧化铜晶格结构中，扫描电子显微镜（SEM）成像也验证了这一点。光致发光研究表明，CuO 中 Cd 浓度的增加会导致更高的发射强度，这为了解 Cu 2+ 和 O 2 的能级提供了宝贵的信息。将掺镉的氧化铜薄膜暴露在氯气中会改变其带隙，这取决于镉的浓度。掺杂镉的氧化铜带隙能的波动表明附近的氯气浓度。对薄膜的 I-V 特性进行的时间分辨测量显示，在暴露于氯气的过程中，电流变化相当大。
{"title":"Time-Resolved Sensitivity of a Cadmium-Doped Copper Oxide Thin Film as a Chlorine Gas Detector","authors":"Turki Alotibi, Waleed Shirbeeny, Ahmed Alshahrie, Mohammed Aida, Jawid Iqbal","doi":"10.12913/22998624/185270","DOIUrl":"https://doi.org/10.12913/22998624/185270","url":null,"abstract":"Due to its strong affinity for chlorine gas, Cd can potentially form CdCl 2 . Cd-doped CuO thin films are sensitive to chlorine gas, as careful inclusion of Cd in the CuO crystal structure modifies the energy gap depending on the dop - ant concentration. We employed spray pyrolysis to deposit Cd-doped CuO on fluorine tin oxide (FTO) while heat - ing the substrate to 500 °C. The X-ray diffraction (XRD) analysis revealed that Cd was interstitially incorporated in the CuO lattice structure, as verified by scanning electron microscopy (SEM) imaging. The photoluminescence study demonstrated that increasing the Cd concentration in CuO resulted in higher emission intensity, providing valuable insights into Cu 2+ and O 2-energy levels. Exposing a Cd-doped CuO thin film to chlorine gas modifies the bandgap, depending on the Cd concentration. The fluctuation in the bandgap energy of copper oxide doped with cadmium indicates the chlorine gas concentration nearby. Time-resolved measurements for the I-V characteristics of the thin film revealed considerable current variation during the exposure to chlorine gas.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"4 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140353583","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/184195
D. Michałowska-Maziejuk, D. Klimecka-Tatar, M. Ingaldi, B. Kaczmarska, Agnieszka Czajkowska
The article presents an analysis of the results obtained from the testing of simply supported reinforced concrete beams subjected to four-point bending. The beams, with two levels of steel reinforcement ( ρ s1 = 1.26%, ρ s 2 = 0.71%), and dimensions of 0.12×0.30×3.30 m, were subjected to loading involving a sudden increase in force with multiple unloading cycles to zero. The study included comparative analysis of deflection results obtained from experimental tests (calculated based on the curvature of the element and readings from measurement devices) with deflection values obtained through calculations based on two selected standards. Real values of ultimate bending moments were also compared with theoretical values. Additionally, compressive strength tests were conducted on eight cubic concrete specimens with a side length of b = 150 mm, obtained for each concrete batch. They con - stitute accompanying studies. Using standard procedures, strength and statistical parameters were estimated and evaluated, taking into account the assessment of the quality of the concrete production used to make the reinforced concrete beams. Ensuring compliance with the process of producing full-sized reinforced concrete beams with existing standard procedures, as well as attention to the quality of concrete production, contributed to achieving satisfactory results in the experimental tests. Knowledge about the impact of loading on mechanical properties enables effective management of factors shaping quality to obtain a construction material with optimal parameters.
文章对承受四点弯曲的简支钢筋混凝土梁的测试结果进行了分析。这些梁有两层钢筋（ρ s1 = 1.26%，ρ s 2 = 0.71%），尺寸为 0.12×0.30×3.30 米，在加载过程中涉及到力的突然增加和多次卸载到零的循环。研究包括对实验测试得出的挠度结果（根据构件曲率和测量设备读数计算得出）和根据两个选定标准计算得出的挠度值进行比较分析。极限弯矩的实际值也与理论值进行了比较。此外，还对每批混凝土中边长为 b = 150 毫米的八个立方体混凝土试件进行了抗压强度测试。这些试验是配套研究。采用标准程序对强度和统计参数进行了估算和评估，同时考虑到了对用于制作钢筋混凝土梁的混凝土生产质量的评估。确保全尺寸钢筋混凝土梁的生产过程符合现有标准程序，并关注混凝土的生产质量，有助于在实验测试中取得令人满意的结果。通过了解荷载对力学性能的影响，可以对影响质量的因素进行有效管理，从而获得具有最佳参数的建筑材料。
{"title":"Management of the Special Processes – An Experimental Study of Bent Reinforced Concrete Beams","authors":"D. Michałowska-Maziejuk, D. Klimecka-Tatar, M. Ingaldi, B. Kaczmarska, Agnieszka Czajkowska","doi":"10.12913/22998624/184195","DOIUrl":"https://doi.org/10.12913/22998624/184195","url":null,"abstract":"The article presents an analysis of the results obtained from the testing of simply supported reinforced concrete beams subjected to four-point bending. The beams, with two levels of steel reinforcement ( ρ s1 = 1.26%, ρ s 2 = 0.71%), and dimensions of 0.12×0.30×3.30 m, were subjected to loading involving a sudden increase in force with multiple unloading cycles to zero. The study included comparative analysis of deflection results obtained from experimental tests (calculated based on the curvature of the element and readings from measurement devices) with deflection values obtained through calculations based on two selected standards. Real values of ultimate bending moments were also compared with theoretical values. Additionally, compressive strength tests were conducted on eight cubic concrete specimens with a side length of b = 150 mm, obtained for each concrete batch. They con - stitute accompanying studies. Using standard procedures, strength and statistical parameters were estimated and evaluated, taking into account the assessment of the quality of the concrete production used to make the reinforced concrete beams. Ensuring compliance with the process of producing full-sized reinforced concrete beams with existing standard procedures, as well as attention to the quality of concrete production, contributed to achieving satisfactory results in the experimental tests. Knowledge about the impact of loading on mechanical properties enables effective management of factors shaping quality to obtain a construction material with optimal parameters.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"89 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140355462","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 paper is focused on providing strength and stiffness for circuit cards exposed to vibration at critical frequen - cies. Since the dry friction damping is more effective than viscous damping and in case when application of vis - cous dampers is restricted by electronic package design the dry friction damper is proposed to be embedded to de-sign of enclosure case in order to reduce oscillation amplitudes of circuit cards at critical frequencies. Dry friction damper produces dissipative forces – non-elastic resistance forces due to friction in kinematic pairs undergoing oscillations. The mathematical model has been developed for estimation of maximal dynamic stress and deflec - tion in critical cross-section of circuit card with embedded dry friction damper at critical frequencies. Developed mathematical model specifies minimal limit value for stiffness of dry friction damper, which is used in engineering calculations to determine its geometric parameters. Design of dry friction damper is introduced by semi-elliptical beam with rectangular profile. The effectiveness of dry friction damper to reduce dynamic stress and deflection in circuit cards has been analytically proved and experimentally testified.
{"title":"Design of Dry Friction Damper to Reduce Vibration Impacts to Circuit Cards at Critical Frequencies","authors":"Ihor Kovtun, Andrii Goroshko, Svitlana Petrashchuk","doi":"10.12913/22998624/184026","DOIUrl":"https://doi.org/10.12913/22998624/184026","url":null,"abstract":"The paper is focused on providing strength and stiffness for circuit cards exposed to vibration at critical frequen - cies. Since the dry friction damping is more effective than viscous damping and in case when application of vis - cous dampers is restricted by electronic package design the dry friction damper is proposed to be embedded to de-sign of enclosure case in order to reduce oscillation amplitudes of circuit cards at critical frequencies. Dry friction damper produces dissipative forces – non-elastic resistance forces due to friction in kinematic pairs undergoing oscillations. The mathematical model has been developed for estimation of maximal dynamic stress and deflec - tion in critical cross-section of circuit card with embedded dry friction damper at critical frequencies. Developed mathematical model specifies minimal limit value for stiffness of dry friction damper, which is used in engineering calculations to determine its geometric parameters. Design of dry friction damper is introduced by semi-elliptical beam with rectangular profile. The effectiveness of dry friction damper to reduce dynamic stress and deflection in circuit cards has been analytically proved and experimentally testified.","PeriodicalId":517116,"journal":{"name":"Advances in Science and Technology Research Journal","volume":"10 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140352882","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}
Pub Date : 2024-04-01DOI: 10.12913/22998624/184341
A. Skoczylas, K. Zaleski
Both dispersed and concentrated shot peening can be an effective method for the finishing of machine components. This work investigates the effect of two different shot peening (SP) processes conducted with the same technologi - cal parameters on selected properties of the surface layer of gray cast iron EN-GJL 250. Specifically, regular shot peening (RSP) and semi-random shot peening (SRSP) were investigated in the study. The results demonstrated that the surface quality of EN-GJL 250 samples was higher after RSP than after SRSP. The analyzed surface roughness parameters were lower after RSP than after SRSP, with the exception of the Rvk parameter. As a result of RSP, the analyzed roughness parameters increased from 5% to 62% in relation to their values after pre-treatment. The lowest values of the surface roughness parameters were obtained after RSP conduced with the impact energy E = 100 mJ, the distance between the dimples x = 0.3 mm, and the diameter of the shot peening element d = 14.3 mm. Assess - ment of the 3D surface topography showed significant differences in the formation of machining traces depending on the employed surface treatment. In RSP, the traces were arranged in a uniform manner, with the assumed step, whereas in SRSP the shot peening traces had no set pattern of orientation. The application of RSP and SRSP caused an increase in surface microhardness. The maximum surface microhardness was 75 HV0.5 for RSP and 98 HV0.5 for SRSP. Residual stresses were higher after SRSP than after RSP. Compressive residual stresses were induced in both types of shot peening process.
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