Пугачов, Є. В. та Літніцький, С. І. та Кундрат, Т. М. та Зданевич, В. А. та Бутеєць, С. П. (2024) ПРОПОЗИЦІЇ ЩОДО ПОЛІПШЕННЯ АКУСТИКИ ЛЕКЦІЙНОЇ АУДИТОРІЇ № 453. Вісник Національного університету водного господарства та природокористування (1(105)). с. 209-218.

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Анотація

Проаналізовано об’ємно-планувальне рішення аудиторії № 453 стосовно відбиття звуку і утворення луни. Було виявлено, що відбитий від бічних стін аудиторії звук покриває поверхню глядачів з великими прогалинами. Крім того, деякі простінки можуть утворювати луну в межах приміщення. Наведені пропозиції щодо поліпшення акустики лекційної аудиторії № 453. Запропоновано влаштувати екран на розрізі приміщення. Виконана його перевірка на утворення луни. Визначені ділянки на стінах та стелі, які слід опорядити звуковідбиваючими матеріалами.

Title in English

PROPOSALS TO IMPROVE ACOUSTIC OF LECTURE AUDIENCE № 453

English abstract

The volume-planning solution of auditorium No 453 was analyzed in the context of the influence of its parameters on the acoustic regime of the room. The value of the specific volume of the hall per spectator was analyzed. This value is recommended to be within 4–5 m3 for classrooms. The reverberation time in the hall depends on this value which in turn affects the volume and audibility. Approximately 200 people can fit in this lecture hall. The volume of the auditorium is approximately 652 m3. One person in auditorium No 453 accounts for 3,26 m3, which is not enough. But the actual reverberation time was not calculated in this work. The acoustic properties of the hall were analyzed only from a geometric point of view. The auditorium is 18,1 m long. Overcoming such a distance, the sound will fade. This problem can be partly compensated by repeated sound reflections from the side walls and ceiling which will serve as sound-reflecting screens. The horizontal flat ceiling was adopted as one sound-reflecting screen. It was also proposed to arrange an additional curved screen at the end of the room. This will boost the sound quality for the last few rows. The partitions between the windows were used on the walls as sound-reflecting screens. Significant parts of the lecture hall where the reflected sound from the side screens does not enter were found. The case when the lecturer stands next to the lectern and, separately, when the lecturer stands opposite the middle of the blackboard, were investigated. Changes in the configuration of the walls did not have the desired effect. Almost no sound was reflected to listeners, or the new screens created a significant echo within the room. Therefore, we did not change the configuration of the plan. A check for echo formation on the longitudinal section showed that no echo will be formed from the ceiling. The boundary surface of the echo formed by the curved screen may occur below the surface of the listeners. Therefore, it can be considered permissible. A check for the formation of an echo from the side screens showed that an echo can be formed from the first wall for both cases of the location of the lecturer (sound source). Zones that should be lined with sound-absorbing materials were also determined. Since the first wall can create an echo, it is recommended to completely cover it with sound-absorbing materials.

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