Acoustic Analysis of an Exhaust MANIFOLD by INDIRECT Boundary Element Method

Citarella, Roberto

doi:10.2174/1874155x01105010138

Cited by 23 publications

(16 citation statements)

References 18 publications

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“…The BEM analysis was performed, resorting to the indirect BEM [18] (quantities at the surface are jump of pressure and jump of normal velocity) with a variational approach for the numerical resolution [19,20].…”

Section: Acoustic Analysismentioning

confidence: 99%

Vibro-Acoustic Numerical Analysis for the Chain Cover of a Car Engine

et al. 2017

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Abstract:In this work, a vibro-acoustic numerical and experimental analysis was carried out for the chain cover of a low powered four-cylinder four-stroke diesel engine, belonging to the FPT (FCA Power Train) family called SDE (Small Diesel Engine). By applying a methodology used in the acoustic optimization of new FPT engine components, firstly a finite element model (FEM) of the engine was defined, then a vibration analysis was performed for the whole engine (modal analysis), and finally a forced response analysis was developed for the only chain cover (separated from the overall engine). The boundary conditions applied to the chain cover were the accelerations experimentally measured by accelerometers located at the points of connection among chain cover, head cover, and crankcase. Subsequently, a boundary element (BE) model of the only chain cover was realized to determine the chain cover noise emission, starting from the previously calculated structural vibrations. The numerical vibro-acoustic outcomes were compared with those experimentally observed, obtaining a good correlation. All the information thus obtained allowed the identification of those critical areas, in terms of noise generation, in which to undertake necessary improvements.

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Section: Acoustic Analysismentioning

confidence: 99%

Vibro-Acoustic Numerical Analysis for the Chain Cover of a Car Engine

et al. 2017

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“…(4) Some noise is generated when the hard surfaces in the cab cause the above three types of noise to bounce back and reverberate; this noise is known as the reverberation noise [6]. Generally, air-borne noise is high-frequency noise and can be reduced by using sound insulation and absorption materials in the vehicle [7,8]. Structure-borne noise is mainly low-to mid-frequency noise, i.e., lower than 1 kHz, and can be controlled by suppressing structural vibrations [9].…”

Section: Introductionmentioning

confidence: 99%

Ontology-Based Noise Source Identification and Key Feature Selection: A Case Study on Tractor Cab

Zhou

Chen

et al. 2019

Shock and Vibration

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This paper proposes an ontology-based noise source identification method, establishes an ontology knowledge expression model in the field of noise, vibration, and harshness (NVH), and provides an extensible framework for sharing noise diagnosis knowledge in the field. Based on the key features extracted from the noise and vibration signals at different positions and the prior knowledge, mechanical engineers can construct an ontology rule and locate noise sources by identifying the intrinsic relationship between signal characteristics through ontology reasoning. A case study is conducted to demonstrate the effectiveness of the proposed method in resolving the problem of integrating multisource heterogeneous knowledge and exchanging noise diagnosis knowledge information in the field of NVH for agricultural machines. Thus, our study facilitates the sharing and reuse of knowledge and advances the development of intelligent noise diagnosis expert systems to a certain extent.

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“…As an alternative to FEM, the boundary element method (BEM) can be adopted for noise emission calculation [10,11]. In [12], the numerical modelling of noise radiated by a car body, using the so-called acoustic transfer vector (ATVs) and modal acoustic transfer vector (MATVs) concepts, is presented.…”

Section: Introductionmentioning

confidence: 99%