Taking a space designed for one purpose and creating an acoustically sound space for musical performance presents unique challenges. A local opera company has undertaken two projects that involve such modifications for this performance season and have sought guidance on the unique acoustic complications involved. The first project was a percussive musical playground in a large art museum, adjacent to sound-sensitive exhibits. The second involved the adaptation of an existing warehouse into a space suitable for the performance of a ballet-opera. Researchers worked with set designers early in the process and throughout set construction. In order to better understand the spaces, impulse responses were taken and analyzed. Impulse response measurement results, acoustic models with suggested modifications, and auralizations at key listening positions are presented to address unique challenges associated with these unconventional spaces. An emphasis has been placed on reaching target values for reverberation time within limited time and resource constraints. Additionally, sound isolation for the two spaces has been addressed with special regard to adjacencies and noises in industrial downtown locations.
An inter-laboratory study across multiple facilities has been completed to quantify the repeatability, reproducibility, and bias of three different sound power measurement methods used in the heating, ventilation, and air-conditioning industry: free field method, diffuse field method, and intensity method. The sound power levels of a loudspeaker source across one-third octave bands have been measured in each participating laboratory by the test methods preferred in those facilities. Both a broadband signal with decreasing slope of - 5 dB per octave band and the same broadband signal with four discrete tones at 58, 120, 300, and 600 Hz have been measured in this round robin study. Comparisons of measured sound power levels have been made between methods, between laboratories, and between laboratories using the same method. Repeatability, reproducibility, laboratory bias, and test method bias are then quantified in accordance with ISO 5725. [Work supported by the Air-Conditioning, Heating, and Refrigeration Institute]
This poster presents results to date from an interlaboratory study, aimed at quantifying the bias and reproducibility of three different sound power measurement methods used in the heating, ventilation, and air-conditioning industry: free field method, diffuse field method, and sound intensity method. The sound power of a certain loudspeaker sound source has been measured in at least 15 testing facilities using the methods generally applied in those facilities. Two test signals are used in the measurements: a broadband signal whose slope decreases −5 dB per octave band, and the same signal with four discrete frequency tones at 58, 120, 300, and 600 Hz. Comparisons of the measured sound power level data, gathered to date, are presented across one-third octave bands. The project continues to collect data from other test facilities so that rigorous findings on the repeatability, reproducibility, laboratory bias, and measurement method biases may be determined, according to ISO 5725. [Work supported by the Air-conditioning, Heating and Refrigeration Institute.]
This paper presents results from an acoustical case study of the atria, corridors, stairways, and other common spaces within two buildings located on the campus of the University of Nebraska-Omaha: the Peter Kiewit Institute and the Barbara Weitz Community Engagement Center. Both buildings, while educational in nature, differ drastically in acoustical design. Impulse responses, noise levels, and transmission loss in both facilities are measured and the resulting acoustic metrics are compared to recommended values for the respective spaces. Descriptions of each building’s architectural features are presented and linked to the measurement results. In particular, many spaces in the Peter Kiewit Institute were designed to expose the building systems, and the lack of acoustical products such as acoustical ceiling tile results in higher noise levels than normally expected. The Weitz Center, however, was designed with great emphasis placed on achieving optimal indoor environmental conditions. The results of this case study support the importance of appropriate acoustic design atria, corridors, stairways, and other common spaces in educational settings.
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