Wyniki wyszukiwania - BazTech

1

Studies on the dynamics the valve train with machined valve springs

Siczek K, Siczek K.

Combustion Engines

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2017

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R. 56, nr 1

100--109

EN

An analysis of the literature for currently used solutions of valve trains in internal combustion engines and analytical studies on the dynamics the valve train of the internal combustion engine provided with machined valve springs were carried out. The aim of the study was to compare the dynamic parameters of the two valve trains for the established internal combustion engine: the first one equipped with machined springs and the second one with coil springs. The numerical models for investigated valve trains, using the Finite Element Method and additional mathematical relationships were developed and presented in the article. The article describes the results of the researches and formulated conclusions.

2

Development of a simplified method for measuring engine motoring friction and its application to valve train friction measurement

Nakashima K., Kato T., Goto K., Murakami Y.

Journal of KONES

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2016

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Vol. 23, No. 2

261--267

EN

We developed a simpler and less expensive method for measuring friction. Our equipment floats the double-end shaft motor by supporting both sides of the motor shaft with bearings, allowing the stator within the motor case to swing on the rotor with the shaft. Two arms were installed in the motor case; one is attached to a load meter; the other to a balance weight. The motor shaft is connected to the engine shaft, and when the engine is operated by the motor, torque is exerted on the stator with the motor case in the direction opposite to the motor shaft rotation, with engine friction acting as the reaction force. Torque is calculated by multiplying the arm length by the load as measured by the load meter in the arm. As an application of our new motoring friction test method, we measured valve train friction. The cylinder head of a single cylinder gasoline engine was clamped on a test bed, and its camshaft was connected to our friction measuring equipment. Utilizing various follower configurations of the rocker arms, we investigated the friction loss between the rocker arms and the cam. We thus clarified the effect of the valve-opening period and the valve lift on friction loss under various camshaft rotation speeds, and understood the lubricating conditions between the rocker arms and the cam.

3

Researches on the sound level induced by operation of valve train components

Siczek K.

Combustion Engines

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2015

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R. 54, nr 3

197--204

EN

The surface vibrations generated during operation of valvetrain components in combustion engine are transmitted as sound waves to the vehicle occupants. They can be measured using various techniques, and in particular the matrix sonometers. The most often it is measured the total sound level generated in the engine. Obtaining the data on the sound level generated by a single element of the valve train requires the use of a specific methodology, for example, experimental studies on the engine model. The paper contain s a review of measurement techniques of the sound level in combustion engine and the different models used for studies on the sound level of engine valves. Model of the research stand was developed using FEM and presented in the article. The obtained sound levels resulting from the modeled signal introduced in selected locations of the engine valve train model have been presented in the article. There was a non-linear increase in the sound level with an increase in frequency of extortion.

PL

Drgania powierzchniowe generowane podczas pracy elementów rozrządu silnika spalinowego są przekazywane jako fale akustyczne do użytkowników pojazdu. Mogą być mierzone przy użyciu różnych technik, w szczególności matrycy sonometrów. Najczęściej jest mierzony ogólny poziom hałasu generowany w silniku. Uzyskanie danych dotyczących poziomu hałasu generowanego przez pojedynczy element rozrządu wymaga użycia specjalnej metodologii, na przykład, badań eksperymentalnych na modelu silnika. W pracy dokonano przeglądu technik pomiaru hałasu silnika spalinowego i różnych modeli silników wykorzystywanych do badań hałasu zaworów. Model wybranego stanowiska badawczego został opracowany przy wykorzystaniu MES i przedstawiony w artykule. Uzyskane poziomy hałasu wynikające z modelowanego sygnału wprowadzonego w wybranych miejscach modelu rozrządu silnika zostały przedstawione w artykule. Zaobserwowano nieliniowy wzrost poziomu hałasu ze wzrostem częstotliwości wymuszenia.

4

Computational Simulation Analysis for Dynamics of Multibody System Coupled with Flexible Deformation of Valve Train

Sun L., Shu G.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 9b

166-171

EN

Rigid and flexible multibody dynamics simulation analysis for the valve train of gasoline engine is conducted on the basis of the different constraints conditions, which among components have been varied in accordance with the kinematic and dynamic characteristics of the system to gradually approximate actual working conditions. Based on Lagrangian equation，absolute Cartesian coordinate and the floating frame of reference formulation for multibody dynamics, the computational dynamic simulation method used in professional simulation approach within computer program of UGNX is employed hereby to compute the displacement curve, velocity curve and acceleration curve of intake valve and exhaust valve, which elaborate the feature of valve motion, dynamic properties of the parts and whole system. Simulation results illustrate that computational dynamics of multibody system is an effective approach to analyze the dynamical characteristic of complex mechanical system in the flexible multibody model on the way of being high fidelity of the real constraints and load conditions of complex mechanical system with the consideration of all nonlinear factors arising from contact and impact constraint, flexible deformation of components and valve spring with designed parameters.

PL

Analiza i symulacja dynamiki szeregu zaworów w silniku benzynowym zawiera zwykle szereg ograniczeń. Przedstawiono nową metodę analizy bazującą na równaniach Lagrange’a i płynnej zmianie odniesień. Metodę zaimplementowano w oprogramowaniu UGNX.

5

One-cylinder marine research diesel engine

Lus T.

Journal of KONES

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2006

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Vol. 13, No. 4

319-324

PL

W referacie został przedstawiony wstępny projekt stanowiska silnika l-cylindrowego budowanego na bazie silnika WOLA 150 D M. Przedstawiono propozycję przebudowy układu napędu rozrządu zaworowego oraz wtrysku paliwa. Akademia Marynarki Wojennej w Gdyni od lat prowadzi prace naukowo-badawcze z zakresu eksploatacji okrętowych tłokowych silników spalinowych. Dotyczą one procesów zachodzących w cylindrach silnika jak i procesów im towarzyszących. Główne tematy badawcze aktualnie prowadzone w Instytucie Konstrukcji i Eksploatacji Okrętów z obszaru silników tłokowych dotyczą: badania przebiegu ciśnienia spalania w cylindrze wraz z wielosymptomową analizą tego parametru do wykorzystania w diagnostyce oraz badania wpływu różnych czynników na toksyczność spalin. Koncepcja układu rozrządu zaworowego z napędem hydraulicznym zaworów, Koncepcja układu wtrysku paliwa, jak również weryfikacja stanowiska wraz z próbami są prezentowane w artykule.

EN

Initial project of one-cylinder high-speed marine diesel engine is presented in this paper. Basic platform for this engine rebuilding was Polish manufactured WOLA DM 150 six cylinders marine diesel engine. Main concern is focused on changes in valve train mechanism and fuel injection system. Naval University in Gdynia for many years carries scientific-investigative works from the range of the operation of shipping piston-combustion engines. They there refer processes reaching in cylinders of the engine as and processes accompanying to them. Main investigative themes at present performed in the Institute of Design and Operation of Battleships of the area of piston engines refer: research of the course of the pressure of the combustion in the cylinder with multi symptom analysis of this parameter for the implementation in the diagnostics and research of the influence of different factors on the toxicity of combustion gases. The idea system of the timing gear distribution with the hydraulic drive of valves, the idea of the fuel injection system , as well as the verification stand along with entrance tests are presented in the paper.