كتاب Acoustical Design of a Conference Hall

اسس تصميم قاعة مؤتمرات Acoustical Design of a Conference Hall RJAV vol VI issue 2/2009 81 ISSN 1584-7284 Acoustical Design of a Conference Hall Toma DOINA Romanian Broadcasting Comp., Technical Departm ent, Bucharest, ROMANIA, email [email protected] Mih ă iescu IOANA IM Architecture Center, Re ş i ţ a, ROMANIA, email [email protected] (Received 18 August 2009; accepted in revised form 28 November 2009) Abstract: In the building of Caras Severin County Council from Municipiul Resita, capital of Caras Severin county, in Romania, was realized an extension and modernization of space located on the first floor where we arranged a conference hall with an exhibition space in the foyer. The beneficiary, Caras Severin County Council wanted this room to have an enviable architecture and modern technological equipment for conference an d teleconference purposes, with facilities for simultaneous translation in at least two languages. The room who have to be arranged had deficiencies between the proportions of geometric dimensions, placement of large reflecting surfaces , windows on the corners room, the poor perfor mance of sound insulation panels on the roof, all these negatively impacting the quality sound. The present paper refers the solutions for acoustical design (sound insulation and perception acoustics) of a conference hall, adjusted to the aesthetic demands of the architecture. We will present the acoustic specifications we would like to achieve for reason able performances regardin g the use for the space. We opted for the acoustic environment of a diffuse field. For this purpose we used moreover for acoustic treatment the sound absorption material and sound diffuser material. Concerted efforts of the architect, acoustic specialist a nd other specialists involved in planning have led to a conference hall with both architectural and modern technological equipment, with good acoustic qualities, good speech intelligibility even without electronic amplifying the sound. Keywords: acoustic design, sound difussors, architecture design The booth ventilation is a natural one. The air comes directly from the foyer threw the grid mounted in the wall booth/foyer. From the foyer the grid it is not directly visible. The wall with the ventilation grid is seen from the foyer like big wall paint made by the local painter Nicolae Vladulescu. 6. CONCLUSIONS The Hall was a difficult case because of economical limitations. The Hall was intended to be a reference for the city and the county. For financial reasons, we didn’t make the measurements in accordance with ISO 3382 to evaluate the interior acoustical conditions of the conference hall. However the subjective impression of most participants was very positive. The participants have appreciated the acoustical perception and speech intelligibility in the room, even without the electro acoustics system. Also the sound insulati on to outdoor noise was appreciated as good. Due to economical limitations, there are some construction elements that have not enough sound reduction indexes as it was evaluated in the acoustical project. But we are in consideration that the background noise level inside the hall caused by 200 persons during a conference is bigger than the level from outdoor noise sources. Finally the hall was good appreciated for its modern architectural environment, high technology equipments and, the least but not the last, good acoustic conditions. REFERENCES [1] Leo L. Beranek, Acoustics , McGRAW-HILL BOOK COMPANY, INC. [2] ISO 2603 (1998), Booths for simultaneous interpretation- General characteristics and equipment [3] ISO 3382 (2000), Acoustics-Measurements of the reverberation time of rooms with reference to other acoustical parameters [4] Kutruff H, Room Acoustics , ELSEVIER SCIENCE PUBLISHERS LTD, 1991 [5] Wegener N., Acoustic Project References in Construction, Ed. Academiei RPR, 1960 [6] Pup ă zan C., Acoustic in Construction- Noise Reduction , Ed. Academiei RPR, 1970 [7] Izenour G, Design , .McGRAW-HILL BOOK COMPANY,
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