JPH04166586A - Sound insulating window - Google Patents

Abstract

PURPOSE:To form a sound insulating panel having high sound insulation efficiency by producing control signals from a sensor for detecting the vibration of a window glass and an operation circuit performing operations of controlling force to offset the vibration. CONSTITUTION:The framework of a window glass 1 is constituted of driving devices 2 capable of vibrating in the vertical direction against the glass face. After that, control signals are produced from a vibration sensor 3 detecting the vibration of the window glass 1 and an operation circuit 5 performing operations of controlling force to eliminate the vibration, and they are transmitted to the driving devices 2. The controlling force is generated in the driving devices 2 to control the vibration of the window glass 1. According to the constitution, the vibration level of the window glass 1 can be minimized even if there are incident noises to the window glass 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound insulating window that is lightweight, thin, and has high sound insulating properties.

[Conventional technology]

BACKGROUND OF THE INVENTION In recent years, noise prevention in living and working environments has become an important issue due to the increase in noise generated due to the development of transportation systems and factory production facilities, as well as the increasing density of housing complexes.

The sound insulation performance of a building against external noise is easily determined by the performance of its openings. Glass windows play a major role in soundproofing the openings. Not only the outer walls of buildings made of reinforced concrete, but also the outer walls of buildings of other structures that are smaller in weight and thickness, exceed the sound insulation properties of window glass, and are effective against external noise. Sound insulation is controlled by the sound insulation of window glass.

In order to improve sound insulation, double-glazed windows with an air layer in the middle are used, but they have problems with sound transmission and space due to the low-frequency resonance transmission phenomenon in which the air layer acts as a spring. .

[Problems to be Solved by the Invention] In view of the above reasons, an object of the present invention is to provide a sound insulating window that is lightweight and thin yet provides high sound insulating properties.

[Means to solve the problem]

In order to solve the above problems, the present invention aims to suppress the transmission of sound waves and improve sound insulation performance by actively controlling the vibration of the window glass. Consists of a drive device that can vibrate vertically,
A sensor that detects the vibration of the window glass and an arithmetic circuit that calculates the control force to cancel the vibration create a control signal, which is then applied to the drive device to generate the control force and suppress the vibration of the window glass. It is something.

[Function] The sound insulation performance of window glass whose surroundings are sealed depends on the vibration characteristics of the window glass. Sound is a wave of air density generated by the vibration of an object, and these waves cause the window glass to vibrate, causing the air on the other side to vibrate, allowing the sound to pass through.
It can be divided into a frequency range that is controlled by the state of plate resonance vibration of the window glass, which has a finite size, a frequency range that is controlled by the surface mass of the window glass, and a frequency range that is controlled by the coincidence effect. The transmission loss of the window glass has the characteristics shown in Figure 1.

In both areas, vibration properties related to the rigidity, mass, damping performance, size, thickness, etc. of the window glass are a problem, and reducing the amplitude of vibration leads to suppressing transmitted waves.

Vibration of the core glass excited by external noise is sensed at a certain position by a sensor such as a vibration pickup, and based on this, a control force is generated by an arithmetic circuit to cancel out the vibration.

The arithmetic circuit stores the vibration characteristics of the window glass, the characteristics of the vibration transmission system such as the drive device, the characteristics of the control system, etc. as a transfer function, and calculates the control force according to the characteristics of the external noise.

The control device vibrates the window glass from its periphery in a direction perpendicular to the surface, and the amplitude and phase of the vibration of the window glass caused by the control force are the same amplitude and the opposite phase of the vibration of the window glass caused by external noise. In this case, the vibration of the window glass becomes extremely close to O. In other words, less sound is radiated due to vibration, which increases the transmission loss value of the window glass.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 2 to 5.

Figure 2 shows a sound insulating window in which the frame (2) is composed of a vertical effect piezoelectric element, which is a piezoelectric material, and a compression type piezoelectric pink-up is arranged as a sensor (3) in the center of the window glass (1). The vibration acceleration of the window glass is detected by the pink-up (3), converted into a voltage signal by the charge amplifier (4), and converted into a control force signal by the arithmetic circuit (5) with a digital filter-up on the board. . This is converted into a voltage signal of the necessary magnitude by a power amplifier (6), which is applied to the longitudinal effect piezoelectric element (2) which is divided as shown in Figure 4, generating a control force in the direction perpendicular to the glass surface. It is configured to do this.

The four sides of the piezoelectric framework shown in Figure 2 are connected, and the structure is such that they apply a controlling force to the window glass (1), but the framework shown in Figure 5 (2) is 4
A structure divided into pieces may be appropriate depending on the material, size, etc. of the window glass (1). Furthermore, the drive device is not limited to piezoelectric materials, but can also be a linear motor using NWI force.

A sensor such as a pickup that detects vibrations only needs to be able to detect the level and phase of vibrations, and does not necessarily need to be in contact with the window glass, but may be located at a position that detects the signal generated by the noise source itself. .

[Effects of the Invention] As described above, the sound insulating window according to the present invention includes a drive device that can vibrate the frame of the window glass in a direction perpendicular to the glass surface, and a sensor that detects the vibration of the window glass, and a sensor that detects the vibration of the window glass. A control signal is generated by an arithmetic circuit that calculates a control force that cancels out vibrations, and this signal is applied to the drive device to generate a control force and suppress the vibration of the window glass, so noise does not reach the window glass. Even when light enters the window, the vibration level of the window glass is suppressed to a low level, making it a sound insulation panel with high sound insulation performance.

[Brief explanation of drawings]

21, Figure 2 and 4 are diagrams showing the features of the present invention, where Figure 2 is a perspective view, Figure 3 is a cross-sectional view, the fourth strain is a cross-sectional view of the drive device, and Figure 5 is a cross-sectional view of the drive device. FIG. 3 is a perspective view showing different embodiments of the present invention. 1...Glass, 2...Framework (drive device), 3...
Vibration sensor, 4...Charge amplifier, 5...Arithmetic circuit, 6...Power amplifier.

Claims (1)

[Claims] (1) The frame of the window glass is composed of a drive device that can vibrate in a direction perpendicular to the glass surface, and a control signal is sent by a sensor that detects the vibration of the window glass and an arithmetic circuit that calculates the control force to cancel the vibration. A sound insulating window configured to suppress vibrations of window glass by generating a control force and applying it to a drive device.