Modeling and Measurement Techniques for Valve Spring Dynamics in High Revving Internal Combustion Engines

Schamel, Andreas; Hammacher, Joachim; Utsch, Dietrich

doi:10.4271/930615

Cited by 23 publications

(12 citation statements)

References 6 publications

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“…Specific component modeling (Takagishi et al 2004;Schamel et al 1993) The following paper addresses camshaft design and durability (Druschitz and Thelen 2002).…”

Section: Recommendations For Further Readingmentioning

confidence: 99%

Vehicular Engine Design

Hoag

Dondlinger²

2016

Powertrain

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“…Specific component modeling (Takagishi et al 2004;Schamel et al 1993) The following paper addresses camshaft design and durability (Druschitz and Thelen 2002).…”

Section: Recommendations For Further Readingmentioning

confidence: 99%

Vehicular Engine Design

Hoag

Dondlinger²

2016

Powertrain

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“…The model showed good agreement with measured accelerations for a direct overhead cam (DOHC) engine with direct acting bucket tappets. Schamel et al [6] expanded on this model of the spring to Kim and David [1] created a model in which the dynamics of the valve spring were calculated using linear vibration theory before numerical integration. Using this approach, a fast ef cient simulation was achieved that included the spring surge phenomenon.…”

Section: Previous Workmentioning

confidence: 99%

Development of a multi-body simulation model of a Winston Cup valvetrain to study valve bounce

McLaughlin¹,

Haque

2002

Proceedings of the Institution of Mechanical Engineers, Part K:

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Valvetrain dynamics is an important factor in the development of engines that operate at high rotational speeds. Valve bounce, which occurs at different speeds in the operating range of the engine, can severely limit the ability of the engine to develop peak power owing to the inability of the valves to seal appropriately. The objective of the work reported in this paper is to develop a model of a Winston Cup (WC) engine valvetrain that can predict the dynamics of the valvetrain at high speed. This model can then be used to develop a more complete understanding of the valvetrain motion and to aid effective design of valvetrains. The model is developed in the ADAMS environment. It contains a exible pushrod, a exible rocker arm and lift-off among all components, the mass of the valve springs, and a uctuating rocker arm ratio. Also included in the model is damping in the valve spring and friction at the rocker arm pivot. Finite element analyses (FEAs) were conducted in order to obtain accurate data for pushrod and rocker arm stiffnesses, and to obtain the frequency response characteristics of the valve springs. The model data represent an actual engine used in WC racing. The model is run at different speeds to determine its dynamic characteristics and to verify its response with models developed previously by other researchers. Valve bounce predictions from the simulation model are compared with measured data from a Spintron test of an identical valvetrain con guration. The results indicate that the model accurately predicts the speeds of maximum valve bounce.

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“…In general, three methods are used in the analysis of valve spring surge: the discrete model, the distributed parameter model, and the finite element model. Seidlitz (1989) and Schamel et al (1993) proposed a discrete model to predict spring surge characteristics and coil clash phenomena. The valve spring was described as a series of mass-stiffness-damper elements, and the coil clash was determined by examining the free space between the adjacent coils.…”

Section: Introductionmentioning

confidence: 99%

Estimation of valve spring surge amplitude using the variable natural frequency and the damping ratio

Liu

Kim

2011

Int.J Automot. Technol.

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Internal vibration of the valve spring is a critical factor in determining the dynamic characteristics of highspeed valve train systems. Because precise prediction of the spring surge amplitude is a difficult problem, especially for nonlinear variable-pitch springs, the development stage requires a process of trial and error. In the present study, a new method that considers the variable natural frequency and variable damping ratio is proposed to predict the spring surge amplitude. First, the change in the natural frequency and damping ratio caused by compression is predicted from the initially given pitch curve at the free height. Second, the spring surge amplitude is estimated by solving the wave equation with nonlinear variable coefficients. The surge amplitudes of typical valve springs are also measured using a motoring test rig and are compared with theoretical results predicted by the spring drawing and cam profile data. NOMENCLATURE d : spring wire diameter [mm] R : spring mean coil radius [mm] c : speed of wave propagation [m/s] k : spring stiffness [N/mm] m : mass of active coils [kg] t : time [s] x : distance along spring axis [mm] L : spring length [mm] φ : camshaft rotation angle [deg] n : order of spring natural frequency G n (φ) : dynamic component of spring internal vibration, function of camshaft angle [mm] ω n (φ) : natural frequency, function of camshaft angle [Hz] ζ (φ) : damping ratio, function of camshaft angle N α : number of active coils E : Young's modulus of spring material [Pa] G : shear modulus of spring material [Pa] ρ : density of spring material [kg/m 3 ] υ : Poisson's ratio γ : shear coefficient of wire cross section

show abstract

Modeling and Measurement Techniques for Valve Spring Dynamics in High Revving Internal Combustion Engines

Cited by 23 publications

References 6 publications

Vehicular Engine Design

Vehicular Engine Design

Development of a multi-body simulation model of a Winston Cup valvetrain to study valve bounce

Estimation of valve spring surge amplitude using the variable natural frequency and the damping ratio

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