Overview of modern contributions in vehicle noise and vibration refinement with special emphasis on diagnostics

U ovom radu prikazana su određena razmatranja vezana za karakteristike buke i vibracija savremenih motornih vozila. Pored naučnog, problematika se razmatra i sa praktičnog aspekta u cilju struktuiranja potrebnih znanja, neophodnih za pravilnu dijagnostiku problema. Takođe se razmatraju napredne analize signala buke i vibracija. Ova sinergija naučnog i praktičnog pristupa predstavlja osnovu za dalja napredna istraživanja.This paper presents certain considerations related to noise, vibration and harshness issues on modern motor vehicles. The first, practical aspect was used toward structuring of the acquired knowledge and relationships, required for proper problem diagnosis. On the other hand, advanced signal analyses are considered. The influence on human body is processed and certain noise and vibration analyzers are presented. This synergy of scientific and applicative approach represents a basis for further research related to this important automotive branch

Modern design and control of automatic transmission and the prospects of development

Rad predstavlja pregled savremenih tehničkih rešenja automatske transmisije u automobilskoj industriji sa pogledom na njihov uticaj na održivi razvoj. Cilj prvog dela rada je strukturalni prikaz specifičnih konstrukcija i sistema upravljanja koji su danas u upotrebi kod automatske transmisije, sa naglaskom na implementaciju mehatronike. Drugi deo je zasnovan na perspektivi razvoja, integrisanjem nekoliko grana 'soft computing'-a, kao što su fazi logika i veštačka neuronska mreža sa ciljem stvaranja optimalnog kontrolnog algoritma za dobijanje doprinosa u smanjenju potrošnje goriva, izduvne emisije, povećanje komfora i performansi vozila.The paper provides an overview of modern technical solutions of automatic transmissions in automotive industry with their influence on sustainable development. The objective of the first section is a structural view of specific constructions and control systems of presently used automatic transmissions, with emphasis on mechatronics implementation. The second section is based on perspectives of development, by integrating some branches of soft computing, such as fuzzy logic and artificial neural networks in order to create an optimal control algorithm for obtaining a contribution to fuel economy, exhaust emission, comfort and vehicle performance

Modern design and control of automatic transmission and the prospects of development

Rad predstavlja pregled savremenih tehničkih rešenja automatske transmisije u automobilskoj industriji sa pogledom na njihov uticaj na održivi razvoj. Cilj prvog dela rada je strukturalni prikaz specifičnih konstrukcija i sistema upravljanja koji su danas u upotrebi kod automatske transmisije, sa naglaskom na implementaciju mehatronike. Drugi deo je zasnovan na perspektivi razvoja, integrisanjem nekoliko grana 'soft computing'-a, kao što su fazi logika i veštačka neuronska mreža sa ciljem stvaranja optimalnog kontrolnog algoritma za dobijanje doprinosa u smanjenju potrošnje goriva, izduvne emisije, povećanje komfora i performansi vozila.The paper provides an overview of modern technical solutions of automatic transmissions in automotive industry with their influence on sustainable development. The objective of the first section is a structural view of specific constructions and control systems of presently used automatic transmissions, with emphasis on mechatronics implementation. The second section is based on perspectives of development, by integrating some branches of soft computing, such as fuzzy logic and artificial neural networks in order to create an optimal control algorithm for obtaining a contribution to fuel economy, exhaust emission, comfort and vehicle performance

EO-based mouthwashes: Is there something that should be known?

The possibility to utilize the antibacterial and antibiofilm potential of essential oils (EOs) in dentistry is recognized and best seen in the design of EO-based mouthwashes. The up-to-date results, obtained with the most commonly used formulation being consisted of thymol, eucalyptol, menthol, and methyl salicylate (Listerine), proved its efficacy against plaque and gingival inflammation. However, novel alcohol-free products remain to be further investigated. Commercially available mouthwash containing curcumin, clove oil, mentha oil, eucalyptol, thymol and tea tree oil, and the mouthwash based on ginger EO (a-zingiberene, b-bisabolene, b-sesquiphellandrene, curcumene), reduced plaque index and improved periodontal status of the patients. The plaque index was also reduced and overall healing was improved after the surgical removal of the third molar by mouthwash containing John wort oil. In addition, Cinnamomum zeylanicum EO-based mouthwash and mouthwash containing peppermint oil were efficient against stomatitis and xerostomia, respectively. In addition to beneficial effects achieved in the mouth, i.e. at the appropriate site of application, novel investigations pointed-out that EO-based mouthwashes could be recognized as efficient in the reduction of bacterial and viral aerosols. This has been shown for Listerine, and for several mouthwashes containing following active substances of plants' EO origin: a-farnesene, b-farnesene, farnesol, nerolidol, a-bulnesene, eremanthin, b-sesquiphellandrene, spiroether, cinnamylacetate, cinnamaldehyde, eugenol, menthol, and carvacrol. This finding could be of special interest, in order to be included in further clinical studies related to COVID -19 pandemic

EO-based mouthwashes: Is there something that should be known?

The possibility to utilize the antibacterial and antibiofilm potential of essential oils (EOs) in dentistry is recognized and best seen in the design of EO-based mouthwashes. The up-to-date results, obtained with the most commonly used formulation being consisted of thymol, eucalyptol, menthol, and methyl salicylate (Listerine), proved its efficacy against plaque and gingival inflammation. However, novel alcohol-free products remain to be further investigated. Commercially available mouthwash containing curcumin, clove oil, mentha oil, eucalyptol, thymol and tea tree oil, and the mouthwash based on ginger EO (a-zingiberene, b-bisabolene, b-sesquiphellandrene, curcumene), reduced plaque index and improved periodontal status of the patients. The plaque index was also reduced and overall healing was improved after the surgical removal of the third molar by mouthwash containing John wort oil. In addition, Cinnamomum zeylanicum EO-based mouthwash and mouthwash containing peppermint oil were efficient against stomatitis and xerostomia, respectively. In addition to beneficial effects achieved in the mouth, i.e. at the appropriate site of application, novel investigations pointed-out that EO-based mouthwashes could be recognized as efficient in the reduction of bacterial and viral aerosols. This has been shown for Listerine, and for several mouthwashes containing following active substances of plants' EO origin: a-farnesene, b-farnesene, farnesol, nerolidol, a-bulnesene, eremanthin, b-sesquiphellandrene, spiroether, cinnamylacetate, cinnamaldehyde, eugenol, menthol, and carvacrol. This finding could be of special interest, in order to be included in further clinical studies related to COVID -19 pandemic

Lectures in Rotodynamic Pumps-From Design and Simulations to Testing

Teaching in hydraulic machines at the University of Belgrade, Faculty of Mechanical Engineering, Chair for Hydraulic Machinery and Energy Systems has a long tradition starting back in the nineteenth century. Numerous experimental test rigs are designed and novel measurement techniques are applied. Students have an ability to design, perform computational fluid dynamics (CFD), manufacture, and test pump units with the supervision of lecturers. This practical work, with concept "do it yourself", attracts students to develop their abilities in 3D geometry modeling, computational fluid dynamics, computer-aided manufacturing (CAM), and application of novel acquisition and data processing softwares. Parallel to this, they develop a piping system, which will be coupled with the assembled centrifugal pump and run the first test. Afterward, they are stimulated to connect the acquisition system with LabView software. They are supported to develop their own application for pump and hydraulic components testing and to perform the tests. The final stage is to integrate this installation in Go-Lab Sharing platform repository or at the Hydraulic machinery and Energy Systems Department website. The purpose of this educational approach is to have well educated students, not only with good theoretical background, but also with practical skills and engineering way of thinking. They have to be able to develop the operational pump hydraulic system, and not only a component

Virtual Instrumentation Used in Engineering Education Set-Up of Hydraulic Pump and System

Numerous students attend courses in hydraulic turbo pumps at the Faculty of Mechanical Engineering University of Belgrade, as well as from other faculties. They have oral lectures and exercises with numerical tasks, but also laboratory exercises. This easily driven upgraded installation is very convenient for laboratory exercises for various groups of students. In this paper is demonstrated upgrade of the present installation with transducers instead of U-tube analogue manometers, acquisition system and LabVIEW application for hydraulic pump diagnostics and flow meter calibration. Pressure transducers are also previously calibrated. This installation has three regulating valves and two for tanks emptying. In this way students could form two simple and one complex pipeline. Serious and parallel combinations of pipe lines could be demonstrated, as well as pump by-pass regulation. Hydraulic pipe curve could be formed for one position of the valve on the pump pressure side and various pump frequencies. This could be repeated for other valve positions. In addition pump head characteristic for one rotation number is formed by changing the valve position. Good overlapping with manufacturer's curve is demonstrated. Cavitation and turbulent swirling flow phenomena could be also visualized and demonstrated on this installation with transparent pump housing, as well as partly suction and pressure pipes

Lectures in Rotodynamic Pumps - from Design and Simulations to Testing

Teaching in hydraulic machines at the University of Belgrade, Faculty of Mechanical Engineering, Chair for Hydraulic Machinery and Energy Systems has a long tradition starting back in the nineteenth century. Numerous experimental test rigs are designed and novel measurement techniques are applied. Students have an ability to design, perform computational fluid dynamics (CFD), manufacture, and test pump units with the supervision of lecturers. This practical work, with concept "do it yourself", attracts students to develop their abilities in 3D geometry modeling, computational fluid dynamics, computer-aided manufacturing (CAM), and application of novel acquisition and data processing softwares. Parallel to this, they develop a piping system, which will be coupled with the assembled centrifugal pump and run the first test. Afterward, they are stimulated to connect the acquisition system with LabView software. They are supported to develop their own application for pump and hydraulic components testing and to perform the tests. The final stage is to integrate this installation in Go-Lab Sharing platform repository or at the Hydraulic machinery and Energy Systems Department website. The purpose of this educational approach is to have well educated students, not only with good theoretical background, but also with practical skills and engineering way of thinking. They have to be able to develop the operational pump hydraulic system, and not only a component

Poster: Remote Engineering Education Set-Up of Hydraulic Pump and System

Educational setup for demonstration of a pump operation and determination of full performance curves is presented. The upgrade of the setup has been done in order to implement electronic measurements, data acquisition, computer control, and for preparation of all necessary hardware elements for remote operation via Internet. Used equipment, rationale behind, characteristics and possibilities of the current status of the setup is discussed in detail