Development of a Lumped-Parameter Model for the Dynamic Analysis of Valve Train Systems

Frendo, Francesco; Vitale, E.; Carmignani, Luca; Gagliardi, David; Matteucci, Luigi

doi:10.4271/2004-32-0051

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…To study the influence of the spring on the dynamic behavior of the whole valvetrain, Frendo [18] proposed a multimass spring model in which the mass points are connected by two series of elastic and damping elements, one for the elasto-dynamic characteristics and the other for the possibility of the spring coils to reach contact with each other.…”

Section: Hence Compression Springs With Multiple Starts Providementioning

confidence: 99%

The effect of machined valve springs application on dynamic properties of electro-hydraulically driven valve train

Szydłowski

Siczek

2022

Combustion Engines

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Nowadays, the constant striving to reduce the emission and increase the overall efficiency over a wide range of speeds and loads of the internal combustion engine (CE) is observed. The different methods for improving the charge exchange in the engine, particularly ones based on the variable valve timing are sought. This variability can be achieved, among others by using the electrohydraulic valve drive. The goal of the present study is to compare the dynamic parameters of the engine valvetrain utilizing the unilateral electrohydraulic valve drive and various types of valve springs. The model of such a drive being developed by authors and experimentally verified was used for the analysis. Using the Finite Element Method, the models of springs made through the machining from single sleeves were developed. The effect of various geometrical parameters of the modernized springs on their stiffness and on the resulted valvetrain dynamics was examined.

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Section: Hence Compression Springs With Multiple Starts Providementioning

confidence: 99%

The effect of machined valve springs application on dynamic properties of electro-hydraulically driven valve train

Szydłowski

Siczek

2022

Combustion Engines

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“…A rigid multibody dynamic model of the valve trains or cam mechanisms that considers each component as a rigid [ 5 , 6 , 7 , 8 , 9 ], and many researchers have used this model to optimize the cam profile [ 10 , 11 ]. A multiple degree-of-freedom (DOF) model has been established by dividing the valve spring into multimass elements [ 12 , 13 ]. The distributed parameter model of the valve spring has better accuracy than the lumped parameter model but continues to neglect the elastic deformation of slender components.…”

Section: Introductionmentioning

confidence: 99%

“…Jump and bounce phenomena [ 7 , 12 , 14 , 15 , 24 ] may occur in the valve train system with the increase in cam speed. Impact forces in the presence of these phenomena cause non-negligible deformation and weaken the dynamic performance of the valve train system.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Dynamic Characteristics for a Valve Train System

Yin

2021

Sensors

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The valve train is one of the main sources of engine vibration, and its dynamic performance is crucial for output power and fuel consumption. The flexibilities of slender bars and beams should be emphasised in the design of valve trains to develop high-power and high-speed engines with industrial applications. A flexible dynamic model of a valve train system is proposed. In the proposed model, the components, except the cam and gear bodies, are modelled as flexible bodies with multidirectional deformations. The gyroscopic effects of the camshaft, cams and gear discs are also considered to predict dynamic responses at high speeds accurately. Gear meshing, the friction of the cam–tappet pair, the centrifugal force of the cams and valve clearance are also considered. Experiments on housing vibration and pushrod stress are conducted to validate the proposed model. Results show that the proposed model can predict the dynamic stress of the flexible components well and predict the trend shown by the housing vibration. The proposed model shows that excessive cam rotation speed and valve clearance will cause intense bounce and jump phenomena. The proposed model can be an important reference for designing engine work speed, adjusting valve clearance and improving component durability.

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“…Several researchers have developed dynamic valve-train models that mostly include the study of elastic vibration mechanisms in valve trains. The model introduced by Frendo et al [2] divided the pushrod and rocker arm into two lumped masses connected with elements, accounting for stiffness and damping. In this way, the elasticity of the pushrod and rocker arm can be included in the solution email: guojie@hrbeu.edu.cn of the valve-train dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Kushwaha et al [6] introduced a multimass model to analyse the valve spring characteristics, including the spring surge effect under dynamic conditions. Frendo et al [2] also developed a multimass spring model in which the mass nodes were connected by two series of elastic and damping elements, one for the elastodynamic characteristics and the other for the possibility of the spring coils coming into contact with each other. Based on the assumption that the possibility of the spring coils coming into contact with each other is very small in regular operation, there is no significant source of non-linearity in the valve spring, and the valve spring is usually described using linear models [7].…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a rigid–flexible coupled dynamic valve-train model

Guo

Zhang

Zou

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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A rigid–flexible coupled dynamics model has been developed to analyse the dynamic behaviour of a pushrod valve-train system of an internal combustion engine. The elastic vibration mechanism of each flexible component is described in a floating reference frame. The mechanical impacts in a valve-train system at the opening and closing events of the valve are affected by the contact stiffness and damping of contact components. The contact force model for the cam–tappet interface was developed based on the elasto-hydrodynamic lubrication theory of finite line conjunction. The finite-difference method is used to solve the rigid–flexible coupled dynamic equations. The algorithm of finite difference and the boundary conditions have been carefully selected to solve the fourth-order Bernoulli–Euler beam equation. Experiments were conducted on a motor-driven valve-train system from a four-cylinder diesel engine. The measured valve displacement, acceleration, and contact forces showed excellent consistency with the predicted results. The rigid–flexible coupled dynamics model has shown improved accuracy compared to the lumped rigid mass system in analysing the dynamic performance of the valve-train system.

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Development of a Lumped-Parameter Model for the Dynamic Analysis of Valve Train Systems

Cited by 8 publications

References 5 publications

The effect of machined valve springs application on dynamic properties of electro-hydraulically driven valve train

The effect of machined valve springs application on dynamic properties of electro-hydraulically driven valve train

Theoretical and Experimental Analysis of Dynamic Characteristics for a Valve Train System

Development and validation of a rigid–flexible coupled dynamic valve-train model

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