Wyniki wyszukiwania - BazTech

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Theoretical research response time of the mechanism for compression ratio changing of the conrod-free engine

Kolesnikova Tatiana, Mischenko Nikolay, Sakno Olha, Suprun Volodymyr, Filipova Galynaa, Nikitchenko Igor, Gorpyniuk Andrii, Nazarenko Mykola

Zeszyty Naukowe. Transport / Politechnika Śląska

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2019

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z. 104

69--83

EN

The mathematical model for calculating the response time of the compression ratio of the mechanism for compression ratio changing (MCRC) is presented in this article. This revealed the influence of various engine factors with the connecting rod and crank mechanism (CRCM) on the operation of the MCRC (for example, the rate of the compression ratio change). The results of the study of the operation of the MCRC indicate a strong influence of the values  (relative area of flow passage of channels) and р (pressure) on the response time τ in the field of their small values. This indicates that with insignificant changes of the area of flow passage of channel of the hydraulic lock and the minute oil pressure in the cavities, a significant response rate of the MCRC is ensured. The results demonstrate the possibility of speedy compression ratio change in the engine with the MCRC. Calculation studies showed that the mechanism full operation occurs quickly (0.02 s per unit εx), which indicates the expediency of using such a high-pressure pump in a four-stroke gasoline engine with CRCM. The mechanism movable body complete movement (S = 4 mm) at the oil temperature in the hydraulic system of 45°C and pressure on the body of p = 60 bar are stated to occur for 0.2 s.

2

Technology for complex parts machining in multiproduct manufacturing

Ivanov Vitalii, Dehtiarov Ivan, Pavlenko Ivan, Kosov Illia, Kosov Mykyta

Management and Production Engineering Review

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2019

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Vol. 10, No. 2

25–-36

EN

At present, the speed of production and its complexity increases with each passing year due to the shorter product life cycle and competition in the global market. This trend is also observed in the machine-building industry, therefore, in order to ensure the competitiveness of enterprises and reduce the cost of production, it is necessary to intensify production. This is especially true in the machining of complex parts that require a great number of setups, and technological equipment. The problem-oriented analysis of complex parts was carried out, the parts classification was structured and developed according to the design and technological features. This made it possible to offer advanced manufacturing processes for complex parts like levers, forks, and connecting rods. The flexible fixtures for specified complex parts were developed. The effectiveness of the proposed manufacturing processes, as compared with the typical ones, provides significant improvement in the production.

3

Rozwiązanie procesowe do obróbki wszystkich rodzajów korbowodów

Świat Obrabiarek i Narzędzi

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2018

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R. 13, nr 9-10

10

PL

Korbowody to silnie obciążone części silnika. Aby uwzględnić redukcję zatrudnienia i redukcję emisji CO2, korbowody stają się coraz lżejsze. Osiąga się to z jednej strony dzięki zastosowaniu wytrzymałych i innowacyjnych materiałów, a z drugiej strony dzięki nowoczesnym procesom produkcyjnym. Zmienia to również kształt prętów łączących i zwiększa się różnorodność kształtów. MAPAL oferuje pełny proces obróbki różnych typów prętów łączących - zarówno na linii produkcyjnej lub centrum obróbkowym, jak i na mokro lub obróbce MQL.

4

Design of dual flywheels with connecting rods for gamma-type Stirling engine

Lekchaum S., Locharoenrat K.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

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Vol. 66, nr 6

919--924

EN

A gamma-type Stirling engine, based on a dual flywheels’ concept, was designed and fabricated. Optimized design of the engine, with connecting rods, was introduced to achieve a steady state of the Stirling engine cycle. Performances of the engine were therefore presented in terms of piston motion, inertia force, angular speed, pressure-volume diagram and temperature difference. It was found that optimum length of 45 mm from the connecting rod was able to reach the maximum output mechanical speed of 738 rpm at the maximum inertia force of 0.5 N. The engine offered thermal efficiency of 46.15% and total output power of 1.21 W under the temperature difference of 267 K. In the future, this design is expected to prove useful for applications in portable generators.

5

The influence of load distribution in kinematic constraints of connecting rod on the results of the stress simulation

Magryta P., Pietrykowski K., Biały M., Szlachetka M.

Combustion Engines

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2017

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R. 56, nr 3

84--87

EN

The article presents the results of simulations research carried out, using Finite Element Method. The simulations were made in the Abaqus software. Calculations were made on the connecting rod of opposed piston engine. The connecting rod was subjected to a compression tests. Different versions of the boundary conditions in the form of load forces and pressure distribution acting on the small end of the connecting rod were presented. Depending on the load distribution acting on the connecting rod small end, different distributions of stresses in the connecting rod geometry were obtained. All studies were performed for the same geometry, the same mesh grid, and for the same value of compressive force (research could be considered as comparable). Changing the size and distribution of stresses in the connecting rod, evidence the impact of the adopted boundary conditions of the load distribution on the calculation results. It is important for the use of modern simulation tools in the design process of new mechanical parts.

6

Optimizing the geometry of the connecting rod in opposite pistons engine

Magryta P., Pietrykowski K., Majczak A.

Combustion Engines

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2017

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R. 56, nr 1

191--196

EN

The article presents the results of simulations research carried out, using Finite Element Method. The simulations were made in the Abaqus software. Studies were related to the reduction and improving of stress distribution in the connecting rod of opposite pistons combustion engine. The connecting rod has been developed in a 3D environment in the Catia software, then imported into the simulation tool, in which stress tests were performed. The connecting rod was subjected to a compression and stretching tests. Boundary conditions of forces used in simulation tests have been developed on the basis of the dynamic model created in the MSC Adams software. The study included nine iterations of geometric changes of connecting rod. Shape as well as properties such as parametric dimensions (rod length) were changed. The changes were dictated by the reduction of the maximum values of the stresses and the size of the fields with large stress values. As a result of the simulations, the improvement of the connecting rod strength was obtained by its geometrical change (which was obtained by reducing the stress fields).

7

Dynamic Analysis of Slider-Crank Mechanism: Finite Element and Multibody Approaches

Hać M., Łazęcki J.

Machine Dynamics Research

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2016

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Vol. 40, No. 4

113--120

EN

A dynamic analysis of a slider-crank mechanism is presented in this paper. Two modelsare taken for consideration: stick model built of beam-type planar finite elements, and solid model. The first model is solved by the Authors’ original programs written in Matlab programming language. The second model is analysed in the Adams/Ansys environment. The mechanism is driven by a variant torque applied to the crank, and vibrational transient response is analysed. The midpoint deflection of connecting rod is compared for both models.

8

Analiza konstrukcji dwukorbowodowych silników spalinowych

Borowski P.

Logistyka

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2015

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nr 3

534--540, CD 1

PL

Układy tłokowo-korbowe to podstawowe i jednocześnie najbardziej odpowiedzialne układy w silnikach spalinowych. Tłoki silników spalinowych ze względu na duże ciśnienie, temperaturę, przyspieszenia oraz prędkości są elementami najbardziej obciążonym cieplnie i mechanicznie. Kolejnymi elementami o dużych obciążeniach są korbowody oraz wały korbowe. Celem artykułu jest wskazanie możliwości poprawy rozkładu sił w układach korbowo-tłokowych. W artykule omówiono niekonwencjonalne układy wykorzystujące dwa korbowody przypadające na jeden cylinder. Porównano siły nacisku na poszczególne elementy. Wykazano zmniejszenie nacisku na korbowody oraz sworznie tłokowe. Udowodniono wyeliminowanie sił nacisku tłoka na ściankę cylindra w układzie z dwoma wałami korbowymi.

EN

Piston-crank systems are basic and the most responsible systems in Internal Combustion Engines. Engines pistons due to high pressure, temperature, acceleration and speed are the most thermally and mechanically loaded parts. Connecting rods and crankshafts are the next most loaded parts. The identification of improvement of forces distribution in crank-piston system is the aim of the paper. The unconventional systems using two rods per one cylinder are discussed in the article. The pressure forces on the elements are compared. The reduction of forces on the connecting rods and piston pins is shown. The elimination of piston reaction on cylinder in system with two crankshafts has been proven.

9

Analiza wytrzymałościowa wybranych elementów układu tłokowo-korbowego jednocylindrowego silnika o zs, Cz. II

Caban J., Droździel P., Winiarski G.

TTS Technika Transportu Szynowego

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2012

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R. 19, nr 9

113--119, CD

PL

W artykule zaprezentowano analizę wytrzymałościową wybranych elementów układu tłokowo korbowego jednocylindrowego silnika o zapłonie samoczynnym. Analizie poddane zostały: tłok, korbowód, wał korbowy oraz sworzeń tłokowy. Wykonano modele geometryczne części silnika, które poddano obliczeniom numerycznym wykonanym w programie ABAQUS. Zaprezentowana analiza obejmuje obliczenia dotyczące rozkładu naprężeń i przemieszczeń w modelach części, rozkładu temperatury, a także uwzględnia zachowanie się części pod wpływem działania sił bezwładności. W tej części artykułu przedstawiono analizę korbowodu oraz wału korbowego przedmiotowego silnika.

EN

The paper presents the strength analysis of selected elements of the piston-crank single-cylinder diesel engine. The piston, the connecting rod, the crankshaft and the piston pin were analyzed. The geometrical models of the engine that were made, were subjected to numerical calculations in the ABAQUS program. The presented analysis includes calculations of the distribution of stresses and displacements in the models of parts, the temperature distribution and it also includes the behavior of the parts under the influence of inertia. This section concentrates on the analysis of the connecting rod and the crankshaft of the single-cylinder diesel engine.