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You searched for subject:(interior vehicle noise). Showing records 1 – 3 of 3 total matches.

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University of Cincinnati

1. Sorosiak, Eric J. Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics.

Degree: MS, Engineering : Mechanical Engineering, 2008, University of Cincinnati

Vehicle noise, vibration and harshness (NVH) problems can be analyzed using numerical methods such as finite element and boundary element analysis approaches, which are generally complex and time consuming. In order to speed the analysis and reduce the calculation burden, an enhanced, simplified numerical acoustic cavity formulation is developed, used and verified for the analysis of several vehicle NVH problems. The simplified model can incorporate multiple acoustic cavities joined by flexible panels to represent adjacent vehicle compartments. Several models are created with different cavity and panel configurations, and transfer functions predicted by these models are compared with corresponding transfer functions from measured vehicle data. The comparison results show that the developed simplified model provides reasonable accuracy for the analysis and simulation of vehicle compartment acoustics. While the initial goal of the simplified model was to develop a tool to observe general trends and effects associated with perturbations in the dimensions and configurations of joined vehicle compartments, results show sufficient accuracy for the model to be used for more detailed analyses as well. Additionally, an active noise control (ANC) system is proposed for <i>tuning</i> vehicle interior response, whereas traditional vehicle ANC is intended to <i>suppress</i> unwanted vehicle response. The proposed concept is adapted from the basic filtered-x least mean squares (FXLMS) algorithm and is studied numerically, utilizing simulated control input speakers inside the passenger compartment. An optimal configuration of these speakers is determined in order to maximize the effectiveness of the ANC system and then the proposed approach is demonstrated using a powertrain noise example in which individual engine firing orders are targeted for shaping either by reducing or enhancing the spectral content. Advisors/Committee Members: Lim, Teik (Committee Chair).

Subjects/Keywords: Acoustics; Engineering; Mechanical Engineering; vehicle; interior; passenger compartment; cabin; cavity; modeling; active noise control; FXLMS; acoustics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sorosiak, E. J. (2008). Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212160316

Chicago Manual of Style (16th Edition):

Sorosiak, Eric J. “Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics.” 2008. Masters Thesis, University of Cincinnati. Accessed August 07, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212160316.

MLA Handbook (7th Edition):

Sorosiak, Eric J. “Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics.” 2008. Web. 07 Aug 2020.

Vancouver:

Sorosiak EJ. Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics. [Internet] [Masters thesis]. University of Cincinnati; 2008. [cited 2020 Aug 07]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212160316.

Council of Science Editors:

Sorosiak EJ. Numerical Simulation and Active Noise Control of Vehicle Interior Acoustics. [Masters Thesis]. University of Cincinnati; 2008. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1212160316


RMIT University

2. Egab, L. A study on a plate-cavity coupling system induced boom noise and countermeasures.

Degree: 2016, RMIT University

Reducing the very annoying boom noise which is heard inside the cabin of a moving vehicle is the motivation and the subject of this research thesis. The attraction of a vehicle to a potential consumer is significantly influenced by its interior noise characteristics. Thus the prediction of vehicle interior noise is a significant challenge for vehicle manufacturers at the early concept design phase. Vehicular interior noise mainly stems from structural vibration such as the power train, driveline vibration or wheel vibration which is induced by road roughness. Among numerous vehicular noise problems, structural-borne noise such as boom noise is considered to have the most annoying acoustic features. The boom noise influences the acoustic quality, and thus the customer&rsquo;s perception of the car for the value and quality. The boom noise generated from structural vibration is mainly due to the strong modal coupling between the flexible structure and the acoustic cavity. Therefore, studying the vibro-acoustic coupling characteristics &ndash; the subject of this research &ndash; is important for car manufacturers. In this research, the first step was to perform experimental modal analysis to identify the plate-cavity resonance problem. Following this, the Finite Element Method (ANSYS) was applied to simulate the plate and cavity system and the simulation results were compared with experimental results; these new results have formed the basis for later analytical formulations and assumptions. Secondly, the deterministic method, based on an Impedance Mobility Compact Matrix, was implemented in the analytical solution to calculate the sound pressure level inside the acoustic cavity and the flexible plate vibration velocity. The analytical results were verified by the results of the VAOne vibro-acoustic simulation model and experimental results. A statistical energy analysis (SEA) was then applied to simulate the plate and cavity system. All SEA parameters were calibrated with analytical formulae and the coupling quotient calculated. The coupling quotient indicated the coupling strength of the plate-cavity system in the mid-high frequency ranges. Then the two methods were combined. The use of the combined method produced results which explained how the air cavity and the flexible structure were coupled in the low-mid frequency ranges. The acoustic pressure calculated by the Impedance Mobility method was used to predict the mean energies of the flexible plate and the cavity. The predicted mean energy curves were verified by the SEA simulation results using the AutoSEA software and experimental data from speaker-microphone experiments. The results from the combined methods have revealed that the coupling between the structure and the acoustic cavity depends on the plate thickness and the cavity size. This study provides a better insight into the coupling strength of the plate structure and the cavity. It is this insight which can be used to understand and solve the boom noise problem. The effect of interior…

Subjects/Keywords: Fields of Research; Vehicle cabin noise; Plate-cavity coupling; Interior trim; Deterministic methods; Statistical energy analysis; Hybrid methods

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Egab, L. (2016). A study on a plate-cavity coupling system induced boom noise and countermeasures. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:161834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Egab, L. “A study on a plate-cavity coupling system induced boom noise and countermeasures.” 2016. Thesis, RMIT University. Accessed August 07, 2020. http://researchbank.rmit.edu.au/view/rmit:161834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Egab, L. “A study on a plate-cavity coupling system induced boom noise and countermeasures.” 2016. Web. 07 Aug 2020.

Vancouver:

Egab L. A study on a plate-cavity coupling system induced boom noise and countermeasures. [Internet] [Thesis]. RMIT University; 2016. [cited 2020 Aug 07]. Available from: http://researchbank.rmit.edu.au/view/rmit:161834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Egab L. A study on a plate-cavity coupling system induced boom noise and countermeasures. [Thesis]. RMIT University; 2016. Available from: http://researchbank.rmit.edu.au/view/rmit:161834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Brno University of Technology

3. Kopecký, Martin. Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles.

Degree: 2019, Brno University of Technology

The bachelor's thesis deals with noise testing applicated on motor vehicles. At first, basic issues of acoustics are mentioned. Next, types of measurement with a short description of methods are given. An attention is paid to the structure of technical regulations which are valid in the Czech Republic and EU. Advisors/Committee Members: Mazůrek, Ivan (advisor), Strecker, Zbyněk (referee).

Subjects/Keywords: Hlukové zkoušky; motorová vozidla; jízdní zkouška; statická zkouška; vnější hluk vozidla; vnitřní hluk vozidla; hluk; zvuk.; Noise testing; motor vehicles; pass-by testing; stationary testing; exterior vehicle noise; interior vehicle noise; noise; sound.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Kopecký, M. (2019). Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/2704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Kopecký, Martin. “Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles.” 2019. Thesis, Brno University of Technology. Accessed August 07, 2020. http://hdl.handle.net/11012/2704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Kopecký, Martin. “Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles.” 2019. Web. 07 Aug 2020.

Vancouver:

Kopecký M. Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2020 Aug 07]. Available from: http://hdl.handle.net/11012/2704.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kopecký M. Hlukové zkoušky motorových vozidel: Noise testing of motor vehicles. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/2704

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.