Design Inspiration

 

Background Introduction

The Daqing Cultural Center Grand Theater is located in the Daqing Development Zone, adjacent to the Daqing Museum, Library, and Daqing Petroleum Institute. It is part of the construction of Daqing Development Zone, with a building area of approximately 23426 square meters, including a 1498 seat theater, a 3500 square meter art exhibition hall and VIP room, dressing room, rehearsal hall, equipment room and other related supporting facilities.

The theater pool seat is approximately horseshoe shaped in plan and has two levels of seating. Use music reflectors and elevating music pools during music performances. The theater was completed and accepted in June 2007, and after acoustic acceptance testing, all indicators met the design requirements. It has been used for major conferences and musical performances, and received positive feedback from all parties. The total number of seats in the auditorium of the Grand Theater is 1480, with a total indoor volume of 14000m3. Each seat has a relatively large volume of 9.8m3. The highest distance from the audience ceiling to the ground is 19.1m, and the farthest visual distance from the stage to the pool seat is 34m.

Determination of Acoustic Indicators for Daqing Grand Theatre

The acoustic indicators of the theater auditorium are based on domestic and international experience, combined with national conditions, and determined through research and discussion by experts organized by the owner. The various indicators are:

(1) Reverberation time. Based on the various uses of Daqing Grand Theater, the final determination is that the reverberation time of the theater is (1.4 ± 0.1) seconds at the intermediate frequency (500Hz). Using a music reflector can increase the reverberation time in the hall by about 0.2 seconds. The high-frequency curve in the reverberation time frequency characteristics is flat, and the low-frequency is 1.2 times higher than the mid frequency.

(2) Uneven sound field. The unevenness of the sound field (Δ Lp) in the audience hall meets the requirement of Δ Lp ≤ 8dB within the frequency range of 125~4000Hz.

(3) Noise level. The background noise of the audience hall meets the NR20 index requirements.

 

Determination of reverberation time

The test values and calculated values of empty field reverberation time are listed in the table.

Table 3: Unit of test empty field reverberation time (S)

Description: RTA840 Testing System

Measurement of sound field distribution

The results of the sound field distribution test are listed in the table.

Table 4: Sound Field Distribution Test Results Unit (dB)

Frequency (dB) Reverberation time (S)	one hundred and twenty-five	two hundred and fifty	five hundred	one thousand	two thousand	four thousand
Auditorium	two point one one	one point six nine	one point five nine	one point five three	one point four two	one point three four

Frequency (Hz) Sound field distribution (dB)	one hundred and twenty-five	two hundred and fifty	five hundred	one thousand	two thousand	four thousand
Auditorium	five point seven	six	four point five	two point six	four point six	two point eight
Description: RTA840 System Testing