Multi-body Dynamics Simulation Study on a Valve Train System

Li, Feng; Zhuang, Jihui; Cheng, Xiaoming; Wang, Qianwen; Chen, Changping; Zhou, Sizhong

doi:10.1109/icctec.2017.00033

Cited by 2 publications

(1 citation statement)

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“…The method to calculate the complex dynamic of the valve-spring systems allows a correct representation of flexible and complex contacts under full consideration of the system dynamics. The methodology combines the multi-body dynamics modeling [3][4][5] and the finite element analysis (FEA) [6]. With this approach the valve dynamics, measured with laser interferometric technique [1], is well correlated with multibody analysis.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Dynamic Stresses on High Performance Engine Valve Spring System Considering Coil Clashing Effect

Calabretta

Sitta

Oliveri

et al. 2021

Lecture Notes in Mechanical Engineering

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The valve train plays a major role in the performance of internal combustion engines by controlling the combustion process and it is therefore one of the key aspects for increasing the efficiency of combustion engines. Considering the dynamics, the spring force must be high enough to reliably close the valve preventing from seating bouncing due to surge modes after the valve closure. On the other side, the spring force should be kept as low as possible in order to reduce the engine friction losses and consequently the fuel consumption. In the high-performance engines, the valve springs have to be designed and optimized for sustaining higher stresses with compact dimensions leading to critical material and manufacturing processes. This requires a reduction of moving masses and a strong focus on design and process optimization of the coil springs for reducing the mechanical load and the friction losses at low engine speed. At the same time, valve train should be reliable at high engine speed. The calculation of stresses and contact forces for moving parts under dynamic load is essential for durability analysis. A method to calculate the contact of moving masses is described and proposed to justify valve motions experimental results. To fully understand the failure mechanism of test bed reliability trials, the dynamic stresses have been calculated modeling the real springs’ shape. The contact forces have been reproduced considering the coil clash effects and the dynamic behavior of the flexible spring.

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