Naslov
Guidelines and benchmarking of the internal combustion engine components for enhacement of NVH performance

Autori
Vizir, Valentina

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
17.05

Godina
2019

Stranica
121

Mentor
Kozarac, Darko

Ključne riječi
NVH ; excitation ; engine ; response ; acceleration

Sažetak
Lower fuel consumption and high power, together with the increased driving comfort, represent some of the most important customer demands. Since internal combustion engine represents one of the biggest contributors to the overall noise and vibration levels, a special attention should be given to the NVH (noise, vibration, harshness) analysis. The objective of this study is to define a method for predicting the NVH performance of the engine components at early stages of engine development before they are coupled to the full engine assembly. As a result, the whole development process would be less time and money consuming. The study is conducted for three gasoline turbocharged inline 3-cylinder engines. Engine components (intake manifold, oil pan and cam cover) are analyzed in mid and high frequency domain for 3rd octave band 800 Hz up to 3rd octave band 3150 Hz (from 708 Hz to 3548 Hz). The first step is to define the adequate boundary conditions that will replace the impact of the forces generated in the engine block and transmitted through the bolts to the observed component. Boundary conditions are defined in the form of enforced motions (accelerations). After that, different types of acceleration curves are applied as excitations at the bolt locations in the forced frequency response analysis. Finally, structure response is evaluated in 3rd octave bands based on the distribution of the surface velocities and the contribution of the observed component to the overall noise radiation level.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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