Case Study of Evaluation and Improvement of Acoustic Performances of Multi-Purpose Hall Constructed with Glass Wall
Seong-Hoon, Seo
Dept. of Architectural Engineering
Graduate School
University of Seoul
Advised by Professor
Myung-Jun, Kim
Many of t...
Case Study of Evaluation and Improvement of Acoustic Performances of Multi-Purpose Hall Constructed with Glass Wall
Seong-Hoon, Seo
Dept. of Architectural Engineering
Graduate School
University of Seoul
Advised by Professor
Myung-Jun, Kim
Many of the multi-purpose halls built in Korea are independent buildings or are built and operated in the form of auditoriums in buildings. The wall of a general multipurpose hall is a sound absorbing and reflecting material with irregularities on a concrete wall that is impossible to see inside and outside, and the ceiling is constructed in the form of a slope or irregularity for acoustic reflection and diffusion, and is dependent on the electro acoustic sound by the audio system. It is universal.
The multi-purpose hall for this study is located on the 3rd and 4th floors of the office building of the N company, and is a multi-purpose hall made of glass walls, unlike the general multi-purpose hall, which is composed of two floors as a multi-purpose hall. The wall is made of glass, which can be seen inside and outside, and is a reflector, and the ceiling is made of flat sound absorbing material. As such, there are many cases of construction and thesis in general multipurpose halls in Korea, but few cases of construction and dissertation construction of multipurpose halls made of glass walls are found.
After the completion of the multipurpose hall, the main purpose of the multipurpose hall is 61% for lectures and education, 31% for performances, and 8% for outside halls. The main purpose of the study is divided into lectures and performances. In speech, speech intelligibility is important, and in performances, reverberation time that delivers rich and sufficient sound of instrument and voice is important. When such lectures and performances of different types are used in the same space, a sound plan and a variable plan are needed to meet both purposes. The architect made a new design. However, the architectural acoustic designer proposed an acoustic design that applied forms and materials that required design changes. Eventually, it was created without design change without finding an agreement.
Therefore, in this paper, the objective acoustic performance was measured, and the result of the measurement was to derive acoustic improvement points. The main results of this study, which conducted an acoustic improvement plan for the multi-purpose hall under study through acoustic simulation, are as follows.
1) The multi-purpose hall to be studied is a multi-purpose hall that requires purposes such as performances and lectures, and needs to meet the reverberation time for each purpose. The average measured reverberation time of the corresponding space at 500 Hz, which is the evaluation standard for architectural acoustic performance, was 1.00 seconds. The value of speech intelligibility (D50) was 23%, and the value of music intelligibility (C80) was -1.99 dB. When comparing the results of the measurement with the appropriate acoustic indicators, the reverberation time was inferior to the performance purpose criteria and exceeded the lecture objective criteria, and the intelligibility was also inferior to the appropriate range.
2) As a result of measuring the acoustic performance of the multi-purpose hall, the acoustic improvement point was derived, and as a result of confirming the sound absorption performance of the existing installed electric curtain, the reverberation time was reduced from 1.00 seconds to 0.83 seconds at 500 Hz, showing the sound absorption performance and variable performance of the curtain. It was confirmed that there was.
3) While maintaining the design of the architect's glass wall, experiments to change the material of the ceiling and seat and to change various curtain materials were applied and reviewed using acoustic simulation as an improvement plan suitable for the purpose of performance and lecture. As a result of the acoustic simulation of the performance improvement plan, the reverberation time was increased from 1.0 seconds to 1.16 seconds at 500 Hz when the existing ceiling (composite ceiling material) was changed to the ceiling A (Acoustical plaster 20 mm), and the ceiling reverberation time was appropriate for the performance of the ceiling A It showed the closest result at 1.17 seconds. Music intelligibility (C80) was found to be suitable for playing symphony instruments (2.01dB) when inside the ceiling A at 500Hz.
4) As a result of the acoustic simulation on the improvement method for the purpose of lecture, the reverberation time is based on 500Hz when the existing curtain (polyester + black curtain + polyester) is changed to the curtain A (curtain wrinkle 50%) under the condition of ceiling A. It decreased from 0.83 seconds to 0.67 seconds, and the inside of curtain A showed the closest result to the appropriat reverberation time of 0.67 seconds. The speech intelligibility(D50) was 64% for curtain A within 500 Hz, and 62% for curtain D (heavy velour), which was close to the appropriate range of 55 to 60%.
Based on the above results, it could be concluded through this study that if the sound design such as the contents of the study was preceded in the initial design stage, it was possible to bring the acoustic completeness suitable for the main purpose of performances and lectures.
This paper is a case study data that realizes the reverberation time suitable for the purpose of multi-purpose hall through the ceiling absorbent and the variable sound absorption medium, which are the main sound absorbing elements when all sides are designed with glass-like reflectors. It is thought to be utilized as.
Key words: glass wall, multi-purpose hall, performance, lecture, variable curtain