{"title":"Simulation of Vibration Propagated by Rolling Element Bearings in Mechanical Gearbox","authors":"Cao Vu Tran, J. Furch, X. Cu","doi":"10.47459/cndcgs.2020.1","DOIUrl":"https://doi.org/10.47459/cndcgs.2020.1","url":null,"abstract":"Rolling element bearings are fundamental component parts to be used in rotational mechanical system. During the operation, vibration signals are generated and these signals are related to the technical condition of rotating machinery. The aim of this paper is simulated the vibration signal that propagated by rolling element bearings in mechanical gearbox. The gearbox dynamic model that combined gearbox components, such as, shafts, involute gears, rolling element bearings is developed. The localized fault is created on the inner race of bearing. The model is simulated using multi-body dynamics solution, after that results are analyzed in waveform and spectral in order to assess the behavior of gearbox.","PeriodicalId":304895,"journal":{"name":"Challenges to national defence in contemporary geopolitical situation","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127805199","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":"Construction Features and Analisis of Warfar Information Model with Markov Switchings under Levy Approximation Conditions","authors":"Igor Igor Samoilenko, A. Nikitin","doi":"10.47459/cndcgs.2020.27","DOIUrl":"https://doi.org/10.47459/cndcgs.2020.27","url":null,"abstract":"We construct and study a continuous model that describes the conflict interaction of two complex systems with non-trivial internal structures. External conflict interaction is modeled by the additional influence of chance. The dynamics of internal conflict are similar to the Lotka-Volterra model, namely the model of information warfare. We interpret the new model of information warfare as the influence of rare events that rapidly change certain ideas of a large number of people. As a result, the number of supporters of different ideas make stochastic jumps that we can see using the Levy approximation scheme. We suggest that such a model could be more natural, as important news now has a quick and wonderful impact on audiences through television and the Internet.","PeriodicalId":304895,"journal":{"name":"Challenges to national defence in contemporary geopolitical situation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130593030","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":"Capacities of the Army of the Czech Republic in Rescue and Liquidation Work in The Regions of the Czech Republic","authors":"Irena Tušer, Jiří Jánský","doi":"10.47459/cndcgs.2020.20","DOIUrl":"https://doi.org/10.47459/cndcgs.2020.20","url":null,"abstract":"The military forces and means are used to fulfill humanitarian tasks of civil protection and to fulfill the tasks [of the Police of the Czech Republic in serious situations endangering lives, health, property, or the environment. If the responsible administrative authorities, territorial self-governing bodies, fire protection authorities, or military rescue units are unable to provide rescue work or liquidate the consequences of a disaster on their own, the military is called. In addition to conventional defense tasks, it is therefore necessary to ensure the overall preparation of all components of the army for the performance of other tasks in cooperation with civilian authorities in their own territory. The paper focuses on the issues of civil-military cooperation, active advances and current capabilities of the Army of the Czech Republic in providing cooperation in rescue and liquidation work in the regions of the Czech Republic. The analysis of this issue identified the key aspects and for the subsequent determination of the evaluation criteria, the multi-criteria method was applied. The authors suggest certain procedures for updating the current situation that could be applicable in practice.","PeriodicalId":304895,"journal":{"name":"Challenges to national defence in contemporary geopolitical situation","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117009994","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}
A. Kravcov, P. Svoboda, J. Stoller, Z. Pokorný, J. Małachowski, Paweł Płatek, P. Baranowski, L. Kruszka, Aidas Vasilis-Vasiliauskas
{"title":"Development of Innovative Solutions for Intelligent Inspection of Products of Additive Manufacturing for Navy Supply","authors":"A. Kravcov, P. Svoboda, J. Stoller, Z. Pokorný, J. Małachowski, Paweł Płatek, P. Baranowski, L. Kruszka, Aidas Vasilis-Vasiliauskas","doi":"10.47459/cndcgs.2020.39","DOIUrl":"https://doi.org/10.47459/cndcgs.2020.39","url":null,"abstract":"Using of 3D printed spare parts for Navy supply supported by mentioned inspection meets the requirement for enhancing the logistic performance by provide to military end-users possibilities to produce spare parts using additive manufacturing solutions, particularly in the context of overseas operations, that can be easily presented with several examples. But with application of additive manufacturing in naval operations to product different objects in a variety of materials in an open water environment, we need to start with development of innovative solutions for intelligent inspection of products of selective laser melting from metallic powders is a topic of great importance in nowadays if we talk about real strategies in logistic support including overseas naval outposts support equipment and the reverse engineering of obsolescent parts such as many of those that could be found on the perspective sea platforms with particular focus on maritime littoral and high sea areas—demonstrate advantages of additive manufacturing.","PeriodicalId":304895,"journal":{"name":"Challenges to national defence in contemporary geopolitical situation","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117198893","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":"Helicopter Turboshaft Engine Emission Estimation Based on Standard Flight Profile","authors":"J. Toth, László Kavas, Benjámin Rózsa","doi":"10.47459/cndcgs.2020.12","DOIUrl":"https://doi.org/10.47459/cndcgs.2020.12","url":null,"abstract":"Over the past decades, environmental protection, including regulation of air pollution, has become an important economic and political issue. Although aviation accounts for only 2% of atmospheric pollution, regulation at national, international and global level is still very important. The high-level aim of our current research is to determine the emissions of aircraft engines in the defense sector and to explore ways to reduce them by using alternative fuels, focusing military aviation. This article presents the methodology for developing a standard flight profile, which is the basis for calculating the operational emissions of military helicopters.","PeriodicalId":304895,"journal":{"name":"Challenges to national defence in contemporary geopolitical situation","volume":"13 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126757476","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}