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DTSTART;TZID=Europe/Berlin:20251114T110000
DTEND;TZID=Europe/Berlin:20251114T120000
DTSTAMP:20260722T155127
CREATED:20251027T082535Z
LAST-MODIFIED:20251027T082535Z
UID:3723-1763118000-1763121600@blog.rwth-aachen.de
SUMMARY:Kraxberger: Wave-based Acoustic Simulations in Large Geometries
DESCRIPTION:In its 2025 report on environmental noise in Europe\, the European Environmental Agency stated that more than 30 % of the European population (about 150 Millionen Menschen) are exposed to long-term unhealthy noise levels from transport sources\, such as road traffic\, railways\, and air traffic. Noise exposure has a greater health impact than better-known risks such as second-hand smoke\, and overall is just behind air pollution and climatic factors. One countermeasure for noise pollution is the construction of noise barrier walls\, for which precise acoustic simulation methods are necessary to ensure the effectiveness of the measure. To date\, sound propagation simulations are based on geometrical methods that do not account for wave effects\, such as diffraction or refraction\, yielding incorrect results\, especially for low frequencies. These low frequencies often cause disturbances and discomfort in humans and can be responsible for pathologies such as hypertonia. In contrast\, an alternative approach is based on solving the wave equation\, fully resolving all wave-based phenomena. These wave-based methods yield more accurate results than geometrical methods\, particularly for low frequencies. The Finite Element Method is used with a Continuous Galerkin and a Discontinuous Galerkin approach to compute outdoor noise propagation in two application examples: Application example 1 presents a simple noise barrier geometry over a flat plane\, and serves as a test case used to highlight differences between the results of geometry-based and wave-based methods. Application example 2 resembles a real-world geometry of an alpine valley with a dominant traffic noise source. A geometry-based simulation\, a Continuous Galerkin\, and a Discontinuous Galerkin Finite Element simulation are performed and the results are compared to each other.\nAnother area\, where acoustic behavior at low frequencies plays an important role\, is room acoustics\, for which two application examples are presented. Application example 3 represents an empty room. To simulate the acoustic field in an empty room\, both the Continuous Galerkin and the Discontinuous Galerkin Finite Element Method are used. The simulation results of the empty room are validated against reverberation time measurements in a real room. Application example 4 presents a common approach to improving low-frequency room acoustics\, namely\, the installation of so-called edge absorbers. These are porous acoustic absorbers positioned along room edges that have good absorption properties in the low-frequency range. To predict the effect of edge absorbers on the acoustic field\, a Continuous Galerkin Finite Element model is presented\, where the absorber is modeled as an equivalent fluid using the Johnson-Champoux-Allard-Lafarge model. The simulation model allows to study interaction mechanisms between room and absorber. The Finite Element model of the room with edge absorbers is validated against transfer function measurements in a real room. In conclusion\, this work underlines the importance of using wave-based simulation methods for low-frequency acoustic simulations. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/kraxberger-wave-based-acoustic-simulations-in-large-geometries/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251124T150000
DTEND;TZID=Europe/Berlin:20251124T154500
DTSTAMP:20260722T155127
CREATED:20251118T123639Z
LAST-MODIFIED:20251118T123639Z
UID:3747-1763996400-1763999100@blog.rwth-aachen.de
SUMMARY:Schwachtgen: Industrial Internship as an Acoustical Engineer and Consultant with Brooks Acoustics Corporation (BAC) in Pompano Beach\, FL\, USA
DESCRIPTION:This presentation will report on an acoustical engineering internship that was completed with and supervised by the American acoustical consulting and engineering company Brooks Acoustics Corporation (BAC) in Pompano Beach\, Florida. \nSince 1992\, the BAC team has contributed to over 1\,100 national and international projects and actively participates in the academic\, standards and professional communities that advance the world of acoustics. The firm operates mainly within the construction industry\, offering design solutions that address any sound-related concerns in the built environment. Such concerns may be\, amongst others\, sound isolation design\, mechanical system noise management\, room acoustical design\, environmental acoustics studies for code compliance and construction project permitting\, or expert witness advisory for legal cases involving noise and acoustics. \nThroughout the one-year-long internship\, many duties typical to the work scope of an acoustical engineer and consultant were fulfilled and learned. The main tasks included conducting of standardized acoustic measurements\, the analysis of test data\, the development of acoustical designs and the related engineering calculation procedures. Findings resulting from acoustical analysis were then documented\, as appropriate\, with written reports and/or with presentations to the various project stakeholders. Other deliverables developed during the internship period included acoustical technical drawings and written design specifications. \nSince the work of an acoustical consultant often involves multiple projects within a given timeframe\, this internship did not follow a single project or a common thread. For that reason\, this short presentation will set focus on only a few notable internship project contributions and tasks\, with the aim of providing a glimpse into the world of acoustical consulting. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/schwachtgen-industrial-internship-as-an-acoustical-engineer-and-consultant-with-brooks-acoustics-corporation-bac-in-pompano-beach-fl-usa/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251128T110000
DTEND;TZID=Europe/Berlin:20251128T113000
DTSTAMP:20260722T155127
CREATED:20251124T103745Z
LAST-MODIFIED:20251124T103745Z
UID:3751-1764327600-1764329400@blog.rwth-aachen.de
SUMMARY:Liu: Analysis of Acoustic Reflection Factor Determination Methods (Industrial Internship)
DESCRIPTION:There are several standardized methods for characterizing the reflection properties of materials\, such as the classic reverberation chamber method and the impedance tube method. For practical application\, some alternative in-situ methods have been developed in recent years. However\, all these methods to determine the reflection factor can lack robustness and reliability. \nIn this report\, a new in-situ measurement probe developed by Cervus Consult is introduced. Evaluation is carried out to better understand its performance. A broad range of degrees of freedom\, such as the measurement geometry\, loudspeaker type\, microphone behavior and room type are examined. Furthermore\, several practical scenarios where potential errors may occur are simulated to assess the robustness. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/liu-analysis-of-acoustic-reflection-factor-determination-methods-industrial-internship/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251128T113000
DTEND;TZID=Europe/Berlin:20251128T120000
DTSTAMP:20260722T155127
CREATED:20251124T103833Z
LAST-MODIFIED:20251124T103833Z
UID:3753-1764329400-1764331200@blog.rwth-aachen.de
SUMMARY:Li: Industrial Internship as an Acoustic Engineer in Goertek Inc.\, Shandong\, China
DESCRIPTION:During the internship at GoerTek Inc.\, the focus was primarily on the analysis and optimization of acoustic systems for “True Wireless Stereo Earbuds”\, so-called TWS devices. The main responsibilities included conducting both subjective and objective tests based on acoustic performance\, evaluating products through metrics such as frequency response curves\, distortion curves\, and manual listening tests. Error analysis was performed on products that received negative evaluation results. This work led to effective modifications during the product development phase\, enhancing acoustic performance\, and corrective measures were proposed for defects in mass production. This experience provided a comprehensive understanding of acoustic device design and the factors influencing acoustic performance. \nMelden Sie sich hier an um Einladungen zu den Kolloquium-Vorträgen per E-Mail zu erhalten.\nRegister here to receive the invitations to colloquium talks via e-mail. \nZoom-Meeting-ID: 954 4073 3814\nPasswort: 450783
URL:https://blog.rwth-aachen.de/akustik/event/li-industrial-internship-as-an-acoustic-engineer-in-goertek-inc-shandong-china/
LOCATION:IHTA Seminarraum (60 Persons) and Zoom-Meeting (Hybrid)\, Kopernikusstr. 5\, Aachen\, 52074\, Deutschland
CATEGORIES:Vortrag Praxissemester
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