IJMIE

Intake Manifold Noise Prediction Due to the Combined Effects of Combustion Loads and Fluid Flow

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Abstract

Reduced engine noise has contributed greatly to the comfort of today’s passenger vehicles. The trend towards lighter vehicles has led to massive increase in the use of plastic parts, especially for engine components such as intake manifolds and intake air pipes. The primary purpose of using a plastic material instead of conventional aluminum cast for intake manifold is to reduce its weight and cost. The engine power can be increased with the help of improved interior surface roughness and lowered air temperature. The increased usage of plastics for air intake manifold (AIM) production, in place of metallic materials, made the NVH optimization more complicated. In recent years, automotive engine manufacturers are increasingly focusing their attention on noise generated by plastic air intake manifolds (AIMs). The main objective is to predict the B12D engine intake manifold noise due to the combined effects of combustion loads and fluid flow pressure at various engine speeds (2000rpm-6400rpm). The meshing of intake manifold was done in finite analysis software HYPERMESH. The post processing was done in NASTRAN software to get the noise levels in AIM. The analytical results were validated by using experimental results.

Recommended Citation

[1] Alex Dunkley, The acoustics of IC engine manifolds, MSc
Thesis, Cranfield University, 2000. Metev and V. P. Veiko,
Laser Assisted Microtechnology, 2nd ed., R. M. Osgood,
Jr., Ed. Berlin, Germany: Springer-Verlag, 1998.
[2] C.F. Taylor, J.C. Livengood, D.H. Tsai, Dynamics in the
inlet system of a four-stroke single cylinder engine,
Transactions of the American Society of Mechanical
Engineers 77 (1955) 1133–1145

[3] K.H. Lee, A study on the influence of plastic intake
manifold on the performance and NVH of in-line 4
cylinder gasoline engine”, SAE paper 980728, 1998.
[4] F. Pricken, Top acoustic of plastic air intake manifolds
SAE paper 1999-01-0319, 1999.
[5] M.F. Harrison. De Soto, P.L. Rubio Unzueta, A linear
acoustic model for multi cylinder I.C. engine intake
manifolds including the effects of the intake throttle,
Journal of Sound and Vibration 278 (2004) 975–1011.

6] Saeed Siavoshani, Mark Stickler and Hassan Nehme,
Brian Krajewski, Analytical and Experimental techniques
in solving the plastic intake manifold NVH, SAE paper
2001-01-1544.
[7] Kexin Hu, Chul Lee and Emile Homsi, David Moenssen,
Acoustic modeling and radiated noise prediction for
plastic air-intake manifolds, SAE paper 2003-01-1448.