JPH046046Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention particularly relates to a chair model used for acoustic experiments in a scale model of a hall or the like.

[Prior art and its problems] The basic structure of conventional chairs for acoustic experiments is made of plywood, aluminum plates, acrylic resin plates, etc., and the back and seat are covered with sound-absorbing materials such as polyurethane foam. The glued item was hot.

However, the basic shape of the above-mentioned conventional model chairs is considerably simplified, and although the sound absorption power may be similar, some of them cannot correspond to the real chair in terms of reflection properties.

Additionally, conventional plywood, aluminum plates, and acrylic resin plates are difficult to process into complex shapes, making mass production impossible.

[Purpose of the invention] The present invention was made to solve the above-mentioned problems with the conventional model chair, and its purpose is to improve not only the sound absorption property but also the reflection property as a transient time characteristic. Another object of the present invention is to provide a chair model for acoustic experiments that can sufficiently satisfy the law of similarity with the real thing.

[Structure of the invention] The chair model for acoustic experiments of the invention is characterized in that the basic structure of the chair is made of expanded polystyrene, and high-density glass wool is bonded to the back and seat parts. The above-mentioned chair is configured as a chaise longue, and is characterized in that a notch is made in the back of the chair to give it resemblance to a real chair.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a chair model, and the basic structure of the chair is made of expanded polystyrene 1a.
High-density glass wool 1 on the back and front parts
b is joined.

This chair model 1 is reduced in size to match the scale (1/10 in this embodiment) of a reduced hall model for acoustic experiments. This chair model 1 is formed as a chaise longue, and has a notch 1c formed in the back, so that it resembles an actual hall chair.

Next, an acoustic experiment in a reduced hall model using the chair model 1 will be described.

FIG. 3 shows a vertical section of the reduced hall model 2, which is all formed to a predetermined scale (1/10 scale in this embodiment) with respect to the actual hall, including its interior structure. A human body model 3 is seated on the chair models 1 arranged in the reduced hall model 2.

As the human body model 3, as shown in FIG.
A and the head 3b are integrally molded, and a cavity 3a' is formed in the body 3a, and then a felt 3c with a thickness of about 1 mm is formed.
It is coated with

Furthermore, a rail 4 is laid at the measurement location, for example, on the floor between the front and rear chair models 1, and a sound receiving device 5 is movably set on the rail 4. This sound receiving device 5 is adapted to be moved and operated from outside the hall miniature model 2.

When the above measurement preparations are completed, the inside of the reduced hall model 2 is sealed, nitrogen as an experimental medium is filled inside, and the actual sound from the speaker 6 is multiplied by the reciprocal of the scale factor (in this example, 10 Perform a predetermined acoustic experiment by emitting a sound with a frequency of

According to experiments conducted by the present inventors, when the suction force of a chair per seat is measured on a real chair and a model, the 6th
As is clear from the figure, the actual frequency range is 63~
It was confirmed that they almost matched in the entire range of 5000Hz (630-50000Hz in the model).

[Effects of the invention] (1) Since the sound absorption characteristics of the chair model were simulated with high accuracy, the reliability of the evaluation quantities (reverberation time and sound pressure distribution) obtained through model experiments is increased.

(2) Because the shape of the chair model is close to the real thing,
The reliability of the evaluation quantity (echo time pattern) obtained through model experiments is increased.

(3) It can be widely used as a standard chair for future acoustic model experiments in reduced hall models.

(4) By using a standard chair like the one of the present invention in various model experiments, the influence of differences in chairs can be ignored, making it possible to strictly compare the experimental results.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the chair model, Fig. 2 is a vertical sectional view of the reduced hall model, Fig. 3 is a perspective view of the human body model,
4 and 5 are diagrams showing the set state of the sound receiving device, and FIG. 6 is a graph comparing the sound absorption coefficient of the actual chair and the model chair. 1... Chair model, 1a... Polystyrene foam,
1b...Glass wool, 2...Reduced hall model,
3...Human model, 3a...Body part, 3a'...Cavity, 3b...Head, 3c...Felt, 4...Rail, 5...Sound receiving device, 6...Speaker.

Claims (1)

[Claims for Utility Model Registration] (1) A chair model for acoustic experiments, characterized in that the basic structure of the chair is made of expanded polystyrene, and high-density glass wool is bonded to the back and seat surfaces. (2) The chair for acoustic experiments according to claim 1 of the utility model registration claim, characterized in that the chair is configured as a chaise longue, and a notch is made in the back of the chair to resemble an actual chair. model.