JPH04334653A - Noise insulation equipment - Google Patents

Abstract

PURPOSE:To provide a noise insulation equipment capable of insulating external noise easily by providing the rolling stock window glass pane with a noise insulating layer having an active means. CONSTITUTION:This noise insulating equipment is formed of a noise insulating plate 1 installed at a window frame in such a way as to cover the whole vehicle inner side face of the window glass pane, a driving part 2 formed of piezoelectric sheets locally attached to the noise insulating plate 1, a vibration sensor 6 for detecting the vibration of the noise insulating plate 1, and a control device 3 receiving a detection signal from the vibration sensor 6 so as to output control input for suppressing the vibration of the noise insulating plate 1, to the driving part 2. An acoustic sensor 7 for detecting the acoustic wave near the noise insulating plate 1 can be applied in place of the vibration sensor 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation device installed in a window frame of a railway vehicle or the like.

0002

BACKGROUND OF THE INVENTION With recent industrial development, there has been an increasing demand for faster speeds for various types of transportation. In particular, emphasis is placed on increasing the speed of railway vehicles that enable mass transportation, and active technological development is being carried out to achieve higher speeds. One of the technical challenges for increasing speed is reducing vehicle weight. However, thinning of various members due to the reduction in vehicle weight reduces the sound insulation effect of external noise, leading to deterioration of the living environment inside the vehicle. Noise that is a problem in railway vehicles includes wind noise caused by high-speed running, drive noise caused by engine drive, and the like. These sounds propagate into the interior of a railway vehicle by vibrating the window glass, which has a particularly low sound insulation effect.

[0003] As a conventional means for solving the above problem, there is, for example, an automobile window glass support structure described in Japanese Utility Model Application Publication No. 57-88614.

0004

[Problem to be Solved by the Invention] However, in the case of the above-mentioned conventional technology, the damping effect is only on vibrations in a specific frequency band, and it cannot be said to be sufficient as a countermeasure against the above-mentioned noise. .

[0005] An object of the present invention is to provide a sound insulation device that reduces noise inside a vehicle.

[0006]

[Means for Solving the Problems] The above object is to provide a driving means comprising a sound insulating plate installed on a window frame so as to cover the entire inside of the vehicle window glass, and a piezoelectric sheet locally attached to the sound insulating plate. , a vibration detection means for detecting vibrations of the sound insulation plate (or a sound wave detection means for detecting sound waves near the sound insulation plate), and the vibration detection means (or the sound wave detection means)
This is achieved by a sound insulation device comprising: a control means that inputs a detection signal from the sound insulation plate and outputs a control signal for suppressing vibration of the sound insulation plate to the drive means.

[0007]

[Function] The function of the sound insulation device of the present invention will be explained.

[0008] In a sound insulating device consisting of a sound insulating plate, a driving means made of a piezoelectric sheet locally attached to the sound insulating plate, a vibration detecting means (or a sound wave detecting means), and a control means, wind noise caused by high-speed running of a vehicle, driving Noise such as sound causes the window glass to vibrate, and the sound waves generated by the vibration vibrate the sound insulating plate covering the window glass in an out-of-plane direction, and the vibration detection means detects the vibration (or the sound wave detection means The controller outputs a detection signal by detecting sound waves near the sound insulation plate, and the control device converts the detection signal into a control signal that suppresses the vibration of the sound insulation plate and outputs it. The means are controlled to suppress vibrations of the sound insulating plate and to reduce noise propagating from outside the vehicle into the interior of the vehicle.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the sound insulation device of the present invention. In FIG. 1, a sound insulating plate 1, which is a shielding member such as glass or plastic that can be deformed into any shape by applying an external force, is attached to a window frame 9 so as to cover the entire surface of the window glass 10 on the inside of the vehicle. It is installed via a sound insulating plate support member 8. Furthermore, if it has this function,
There is no problem even if the material of the sound insulating plate 1 is other than this. Moreover, the sound insulating plate 1 needs to have transparency equal to or higher than that of the window glass 10 due to its structure.

Furthermore, the sound insulating plate 1 has one or more drive units 2 as driving means having the function of deforming the sound insulating plate 1 or applying force to the sound insulating plate 1. The drive unit 2 has, for example, a structure in which a plurality of piezoelectric elements are bonded together.

Next, the operation of the sound insulation device of this embodiment will be explained. In the railway vehicle 11 shown in FIG. 3, for example, the window glass 10 vibrates due to noise such as wind noise generated during high-speed running, drive sound from a vehicle drive device (not shown), etc., and the window glass 10 itself becomes secondary. It becomes a source of noise. When the sound insulating plate 1 is about to be deformed in an out-of-plane direction by the sound waves of the noise emitted from the window glass 10 as a secondary noise source, one or more vibration sensors 6 as vibration detection means The deformation is detected, and by means of an appropriate control input 5 from the control device 3 in response to the detection signal 4, the drive unit 2 deforms so that the entire sound insulating plate 1 deforms in a direction opposite to the deformation direction. Alternatively, the drive unit 2 applies force to the sound insulation plate 1. The local deformation of the sound insulation board 1 due to this is transmitted to the entire sound insulation board 1, the deformation of the sound insulation board 1 in the out-of-plane direction is suppressed to a small level, and the propagation of noise into the inside of the railway vehicle 11 is suppressed to a small level. .

FIG. 2 shows another embodiment of the sound insulation device. This embodiment shows a case in which one or more acoustic sensors 7 that detect sound waves near the sound insulation plate 1 are installed instead of the vibration sensor 6 that detects deformation of the sound insulation plate 1 in the embodiment shown in FIG. ing. It has been found that the same sound insulation effect as in the example can be obtained in this example as well.

The control device 3 need not be particularly limited as long as it can realize this operation, and may have the configuration shown in FIG. 4, for example.

In FIG. 4, the control device 3 is composed of an amplifier, a gain adjuster, a voltage generator, and a voltage amplifier. A minute detection signal 4 from the vibration sensor or acoustic sensor 7 accompanying the deformation of the sound insulating plate 1 is first amplified by an amplifier. Next, the detection signal 4 is multiplied by an appropriate control gain by a gain adjuster, a corresponding voltage is generated by a voltage generator, which is further amplified by a voltage amplifier 3, and finally applied to the drive unit 2. be done.

The sound insulation device of the present invention can also be easily applied to aircraft, automobiles, etc.

[0016]

According to the present invention, a sound insulation device includes a sound insulation board installed on a window frame so as to cover the entire inside surface of the window glass, a piezoelectric sheet locally attached to the sound insulation board, and a piezoelectric sheet that is locally attached to the sound insulation board. A vibration detection means (or sound wave detection means) that detects the vibration of the sound insulation board (or nearby sound waves) and outputs a detection signal, and converts the detection signal to deform the sound insulation board in the opposite direction of the vibration direction of the sound insulation board. Since the sound insulation device includes a control means for applying a control signal to the piezoelectric sheet, this sound insulation device has a sound insulation effect of attenuating the vibration of the sound insulation plate and reducing noise.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a sound insulation device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a sound insulation device according to another embodiment of the present invention.

FIG. 3 is a side view showing the railway vehicle of the present invention.

FIG. 4 is a block diagram showing the configuration of a control device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Sound insulation board, 2... Drive part, 3... Control device, 4... Detection signal, 5... Control input, 6... Vibration sensor, 7... Acoustic sensor, 8
...Sound insulating plate support member, 9...Window frame, 10...Window glass.

Claims (1)

[Claims] Claims: 1. A blocking member installed in a window frame of a railway vehicle so as to cover the entire surface of the window glass; a driving means comprising a piezoelectric sheet locally attached to the blocking member; A sound insulation device comprising: vibration detection means for detecting vibration; and control means for inputting a detection signal from the vibration detection means and outputting a control signal for suppressing vibration of the blocking member to the drive means.