RU227530U1 - Coated Acoustic Horn Panel - Google Patents

Abstract

The utility model belongs to the class of devices that enhance the passage of sound in one direction and limit the passage of sound in the opposite direction by using multiple horns in the panel design, directed in one direction. The technical result provided by the given set of features is an even greater reduction in the strength and amplitude of the sound wave that will pass through the panel “head-on” to the horns (the direction of narrowing of the horns), an even greater ratio of the strength of the sound wave passing in the forward direction (the direction of expansion of the horns) to the force of a sound wave traveling in the opposite direction (the direction of narrowing of the horns). A device for unidirectional sound amplification, consisting of a panel made of a material having a sound absorption coefficient in the mid-frequency range above 0.11 and coated on the front with a paint coating, with horns located inside, placed close to each other along the entire plane of the panel and directed in one direction .

Description

The utility model belongs to the class of devices that enhance the passage of sound in one direction and limit the passage of sound in the opposite direction by using multiple horns in the panel design, directed in one direction.

The source Acoustic horn panel is known from the prior art (patent No. 223035 RU Application No. 2023119455 dated July 24, 2023).

This source is taken as a prototype.

When a sound wave, moving through the air, reaches some obstacle, part of the energy of this wave is reflected back, part is damped due to mass and thickness - since in order to transmit a sound wave from a less dense to a more dense medium, energy must be expended in order to overcome this dense environment. And the third part of the energy of the sound wave, which was not reflected from the barrier and was not absorbed by its body, can exit (re-emit) from the back side of the wall. [1]-[3], [4] (Fig. 1), where

Incident (incoming) sound wave - 1,

reflected sound wave - 2,

absorbed sound wave - 3,

transmitted (re-emitted) sound wave - 4.

The problem that the useful model is aimed at is an even greater reduction in the strength and amplitude of the sound wave that will pass through the panel moving in the direction of the narrowing of the horns, that is, “in the forehead” of the horns, and also an even greater ratio of the strength of the sound wave passing in the direct direction direction (the direction of expansion of the horns) to the force of the sound wave passing in the opposite direction (the direction of narrowing of the horns).

This task is achieved due to the fact that the Coated Acoustic Horn Panel device uses a paint coating on the front surface of the panel (the surface with a large horn flare), which enhances the reflection of sound waves.

The technical result provided by the given set of features is:

1) an even greater reduction in the strength and amplitude of the sound wave that will pass through the panel “in the forehead” of the horns (the direction of narrowing of the horns);

2) an even greater ratio of the force of the sound wave passing in the forward direction (the direction of expansion of the horns) to the force of the sound wave passing in the opposite direction (the direction of narrowing of the horns) (Fig. 2, 3).

The device consists of a panel - 6 made of a material having a sound absorption coefficient in the mid-frequency range above 0.11, in which horns - 7 - are located close to each other, and an applied paint coating - 8.

The process of passing and amplifying a sound wave in the forward direction is explained in Fig. 4.

The incoming sound wave 1 enters the horn hole. Some of the waves are reflected - 2. Some of the waves are absorbed - 3. Due to the wave nature of sound waves, after passing through the hole, the waves move spherically and are reflected from the walls of the horn - 5, due to which the sound power increases. Reflecting sound waves, the horn collects them near its axis. The horn walls reduce the acoustic short circuit effect. [4], [5]. The sound wave intensifies. Transmitted (re-reflected) and focused and amplified sound wave - 4, 5, applied paint coating - 8.

In fig. Figure 5 shows the movement of sound waves in the opposite direction. That is, “head-on” to the horns, where 1 is the incident (incoming) sound wave moving in this direction, 2 is the reflected sound wave from the panel walls and the surface of the horn, covered with paint and varnish, 3 is the absorbed sound wave, 4 is passing through the hole panels and reflected sound wave, 8 - applied paint and varnish coating.

The applied paint coating, after drying, forms a smooth and durable film that more effectively reflects sound waves. The sound wave is weakened even more. [4], [5], [8].

As a result: when applying a paint coating on the frontal surface of a panel (a surface with a large horn flare), the stated task is aimed at

1) a greater reduction in the strength and amplitude of the sound wave that will pass through the panel “in the forehead” of the horns (the direction of narrowing of the horns);

2) a greater ratio of the force of the sound wave passing in the forward direction (the direction of expansion of the horns) to the force of the sound wave passing in the opposite direction (the direction of narrowing the horns) will be achieved.

The practical application of such acoustic horn panels is possible when using them in the construction of walls and doors of children's rooms in kindergartens (nurseries) and in simple residential premises in order to amplify the sound of the mid-frequency range (human speech, children's crying) coming from them and attenuate the sound , coming inside; in the design of stamping shops of factories, where low-frequency noise predominates and only the mid-frequency range (human speech) needs to be amplified for quick notification in emergency situations.

It is also possible to use it for equipping premises of the special services of the Ministry of Internal Affairs, FSB, where constant sound amplification in one direction and limitation in the opposite direction is necessary.

Literature:

1. Isakovich M.A. General acoustics. M.: Nauka, 1973

2. Lamb G. Dynamic theory of sound. M.: GIFML, 1960

3. Rzhevkin S.N. Sound theory problems. M.: MSU, 1976

4. Sound insulation and sound absorption. Osipov L.G. (ed.). ACT. Astrel. Moscow. 2004

5. Designing horn loudspeakers Magazine “Master 12 Volt” Dec./January 2005

6. Zhigacheva G.A., Belikina S.V. Guide to measuring and calculating the acoustic characteristics of sound-absorbing materials Moscow NIISF Gosstroy USSR, 1979

7. I.G. Trunova, A.B. Elkin, V.M. Smirnova SELECTION AND CALCULATION OF PROTECTION AGAINST NOISE AND VIBRATION Nizhny Novgorod, Nizhny Novgorod State Technical University named after. R.E. Alekseeva. Printing house of NSTU 2012

8. L.M. Brekhovskikh, O.A. Godin - Acoustics of inhomogeneous media. T. 1: Fundamentals of the theory of reflection and propagation of sound. - M.: Science 2007.

Claims (4)

1. A device for unidirectional sound amplification, consisting of a panel made of a material having a sound absorption coefficient in the mid-frequency range above 0.11 and coated on the front with a paint coating, with horns located inside, placed close to each other along the entire plane of the panel and directed towards one side. 2. A unidirectional sound amplification device according to claim 1, characterized in that the panel is made of polystyrene foam, polyurethane foam and/or wood. 3. A device for unidirectional sound amplification according to claim 1, characterized in that the horns are made in a conical, exponential and/or hyper-exponential shape. 4. A unidirectional sound amplification device according to claim 1, characterized in that the horns are arranged in a staggered and/or staggered pattern offset by half a position in each subsequent row.