JPH11342373A - Impulsive sound generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impulsive sound generator with its coefficient of restitution fulfilling the time characteristic of the impact force stipulated in JIS irrespective of changes in temperature where the measurement is made. SOLUTION: A solid impactor 1 consisting of a columnar part 3 and the semispherical impact part 2 provided to one end face of the columnar part is integrally molded with an elastic body such as rubber, and a supporting seat 8 arranged at a specified distance form the other end face of the columnar part 3 is supported by the supports 4 furnished at intervals along the circumference of the columnar part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact sound generator used for measuring a floor impact sound level indicating a level of blocking performance against a floor impact sound of a building. And a heavy floor impact sound generator.

[0002]

2. Description of the Related Art Sound insulation is becoming a problem in buildings, especially apartment buildings. This sound insulation is usually measured using a sound receiving device consisting of a sound level meter and an octave analyzer, which generates an impact sound very similar to a floor impact sound using an impact sound generating device. Standards (hereinafter "JIS Standards")
That. ) A1418. The impact sound generator includes a lightweight floor impact sound generator that generates an impact sound similar to the walking sound of a person wearing high heels and shoes with hard soles, and a child's jumping sound and the impact sound when running around An imitation heavy floor impact sound generator is used.

Conventionally, a so-called tapping machine has been provided as a light impact sound generator, and a floor impact sound generator disclosed in Japanese Patent Application Laid-Open No. 55-156822 has been provided as a heavy floor impact sound generator. . And this Japanese Patent
The floor impact sound generator of No. 5-156822 uses an automobile tire with a wheel as an impact body, and lifts the automobile tire attached to the opposite end of the arm rod that swings around one end to lift the floor. The impact sound was generated by hitting the surface. For this reason, when the temperature at the measurement location changes depending on the season or land, the air pressure inside the automobile tire changes, and the resilience coefficient of the impact body changes, and the time characteristic of the impact force of the JIS standard cannot be satisfied. there were.

[0004]

SUMMARY OF THE INVENTION According to the present invention, the resilience coefficient of the impact sound generator is set to JIS even when the temperature of the measuring place changes.
An object of the present invention is to provide an impact sound generator that satisfies the time characteristic of the impact force of the standard A1418, expands the usable temperature range of the impact source, reduces the volume as much as possible, and saves space.

[0005]

According to the present invention, there is provided an impact sound generating device in which a solid impact body comprising a cylindrical portion and a hemispherical impact portion provided on one end surface thereof is integrated with an elastic body such as rubber. And a support seat plate arranged at a predetermined distance from the other end surface of the columnar portion is supported by a support provided at intervals along the circumference of the columnar portion.

[0006]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, the impact sound generator of the present invention has an impact body 1 which is made of an elastic body such as silicon rubber and is solid. The impact body 1 includes a cylindrical portion 3 and a hemispherical impact portion 2 provided integrally on one end surface (lower surface).

[0007] On the other end surface of the cylindrical portion 3, that is, on the upper surface 10,
Three support members 4 composed of embedded bolts with threaded portions are embedded at equal intervals along the circumference.
The support seat plate 8 is inserted into the exposed portion of the support 4 via the spacer 6, and the nut 7 is screwed to the support 4 above the support seat plate 8, whereby the support seat is placed above the column 3. A plate 8 is attached. The distance between the lower surface 9 of the support seat plate 8 and the upper surface 10 of the column 3 forming the impact body 1 is maintained at a predetermined distance equal to the thickness of the spacer 6.

As shown in FIG. 1, the support seat plate 8 is a disk having a predetermined plate thickness, through which the embedded bolt as the support 4 can be inserted, and the outer diameter of the nut 7 (see FIG. 2). Three holes having a smaller diameter than that of the support body 4 of the cylindrical portion 3 constituting the impact body 1 are provided at intervals of R = 120 ° in the circumferential direction. Further, as shown in FIG. 2, the central portion 5 of the support seat plate 8 is connected to a lower portion of a mounting rod 12 having a circular cross section of an impact body lifting device 14 described later. The free fall direction of the impact body 1 is defined as a lower side, and the opposite side is defined as an upper side. The diameter of the impact portion 2 and the cylindrical portion 3 constituting the impact body 1 is the same as the diameter of the support seat plate 8.

JIS standard "JIS A 1418-19"
An outline of an embodiment in which an impact sound generator 11 using the impact sound generator of the present invention is used for measuring the floor impact sound level specified by 78 "will be described with reference to FIG. In the generator 11, an impact body lifting device 14, which will be described later, is arranged on four radially extending legs 13, and the impact body 1 is held below the impact body lifting device 14. Is installed on a floor 16 to be measured in the measurement room 15, and a microphone 18 to which a sound receiving device including a sound level meter and an octave analyzer (not shown) is connected is installed in a sound receiving room 17 below the floor 16 to be measured. ing.

The impact body lifting device 14 includes a pulley 31
a, 31b, a sensor s, a motor (not shown), an electromagnetic clutch, a gear, and the like.
0, the pulleys 31a, 31b are lifted up to a height h specified in the JIS standard, and controlled by a control device (not shown) so that the impact body 1 naturally falls on the floor 16 to be measured. As shown in FIG. 4, even if the impact body 1 falls on the floor 16 to be measured, the impact body 1 is solid and thus deforms little, so that a change in the contact area with the floor is small. Then, the floor impact sound level is measured in the sound receiving room 17, and the measured value is calculated based on the JIS standard.

In the JIS standard, the repulsion coefficient of a heavy impact source is 0.7 to 0.9, and the surface of the heavy impact source that is in contact with the floor is
The radius of curvature is 10 to 30 cm, and the impact time characteristic is shown by the solid line B in FIG.
And C, it is specified that another method may be used instead of the method of measuring the floor impact sound level by the automobile tire. FIG. 5 is based on the actual impact force of the car tires while taking into account the response to jumping and the like of a child which is actually a problem in an actual building.

In FIG. 5, the vertical axis represents the impact force (unit: Newton), and the horizontal axis represents the impact time t (unit: millisecond). The intersection of the horizontal axis and the vertical axis is 0, and the value of the vertical axis is D = 11.
00, E = 3600, F = 4200, the value of the horizontal axis is G = 1
0, H = 20, I = 22. B and C are equations of the impact force time characteristic, and B = 4200 × sin (π / 24 ×
(T + 2)), C = 3600 × sin (π / 20 × t)
It is. However, the unit of the angle is radian.

Experiments have confirmed that the impact sound generator of the present invention satisfies the conditions shown in FIG. The impact body 1
Height 165mm, diameter 225mm, repulsion coefficient 0.7
0 to 0.80, the weight was 7.8 kg, and the weight including the support 4, the support seat plate 8 and the mounting rod 12 was 8.3 kg. When the distance between the lower end of the impact body 1 and the floor is 4
It was dropped freely from a height of 55 mm and the distance from the upper surface of the impact body to the floor was 620 mm, and its impact force time characteristics were measured. As a result of repeating this multiple times, the maximum impact force was 38
50-3900N, impact duration 21.4-21.5
mS, and the impact force characteristic of the impact sound generator of the present invention is shown in FIG.
Dashed line. The usable temperature range of the impact sound generator of the present invention is -40 ° C to + 50 ° C.

Next, with reference to FIGS. 6 and 7, a mechanism for naturally dropping the impact body 1 onto the floor 16 to be measured and raising the impact body 1 to a predetermined height h will be described. Impact body lifting device 14
Is formed in a box shape in which two plates are separated from each other by a predetermined distance, and a friction wheel 20, a guide wheel 21, a driving force transmission lever 23, a contact / separation wheel 24, a cam 25, and the like are rotatably disposed therein. . Outside the box, a pulley 31a coaxial with the friction wheel 20 and a cam 25
31b, pulley 31a and pulley 3 coaxial with
A V-belt 30 and the like indicated by a broken line extending over 1b are provided.

An alternate long and short dash line indicates a concave portion provided in the friction wheel 20 and the guide wheel 21.
4, the torque of the friction wheel 20 is transmitted.
A driving force is always applied to the shaft of the friction wheel 20 by a motor (not shown) in a direction in which the impact body 1 is pulled up. An electromagnetic clutch is provided between the pulley 31b and the cam 25. When the impact body 1 is pulled up to a predetermined height h, the upper surface of the support plate 8 of the impact sound generator is detected by the sensor s, and the driving force is reduced. It is controlled to be disconnected.

The guide wheel 21 is configured to guide the mounting rod 12 held by a contact wheel 24 and a friction wheel 20 rotatably provided on a driving force transmission lever 23 described later. The rod 12 is stably held. The driving force transmission lever 23 is substantially T-shaped, and one end of a long side portion thereof is supported by a box so as to be rotatable about a driving force transmission lever shaft 26, and the other end is constantly pressed by a coil spring 27. . An end of the short side portion is bent, and a driven wheel 28 is provided rotatably.

When the sensor s does not detect the upper surface of the support seat plate 8 of the impact sound generator, the electromagnetic clutch is deenergized, the rotation of the pulley 31b is not transmitted to the cam 25, and the driven wheel 28 of the driving force transmission lever 23 is not driven. 7 is at a position deviated from the high position of the cam 25, and the pressing force of the coil spring 27
The driving force transmission lever 23 rotates in the middle arrow Z direction, and the vehicle 2
4 also moves in the same direction. As a result, the gap between the friction wheel 20 and the approach / separation vehicle 24 decreases, and the mounting rod 12 is sandwiched between the friction wheel 20 and the approach / separation vehicle 24. As described above, since the driving force is always applied to the shaft of the friction wheel 20 in the direction in which the impact body 1 is pulled up, the impact body 1 is pulled up.

When the impact body 1 is raised at a predetermined height h, the upper surface of the support seat plate 8 is detected by the sensor s, and the electromagnetic clutch is energized. Then, the rotation of the pulley 31b is transmitted to the cam 25, and the cam 25 rotates. Driven vehicle 2
8 contacts the high position of the cam 25, the driving force transmission lever 23 rotates in the direction of the arrow X in FIG. 6 against the coil spring 27, and the disengagement and disengagement wheel 24 moves in the same direction about the driving force transmission lever shaft 26. Rotate. That is, the gap between the friction wheel 20 and the contact / separation vehicle 24 increases. Therefore, the mounting rod 12 is released from being gripped by the friction wheel 20 and the separation / separation vehicle 24, and the impact body 1 falls on the arrow Y direction in FIG. However, the mounting rod 12 is completely separated from the friction wheel 20 and the disengagement wheel 24.
Instead of falling out from between, the impact pair 1
6 is present between the friction wheel 20 and the approaching / separating vehicle 24 when dropped on the vehicle.

The output signal from the sensor s is self-held and the electromagnetic clutch is kept energized.
5 continues to rotate, and the driven wheel 28 is separated from the high position of the cam 25. Then, the driving force transmission lever 23 is connected to the coil spring 2.
7, the attachment rod 12 is pinched between the friction wheel 20 and the approaching / separating wheel 24,
The self-holding of the electromagnetic clutch is disconnected and returns to the initial state. According to this device, since the impact body 1 is moved up and down in the vertical direction, the installation area of the floor impact sound generator can be reduced.

[0020]

According to the present invention, a solid elastic body is used without using a hollow tire as an impact body, and a single impact body consisting of a hemispherical impact portion and a cylindrical portion is provided above the impact body. It is supported by the support seat plate at a predetermined distance by a support body spaced along the circumference. Therefore, even if the temperature of the measurement place changes due to the season or the land, the resilience coefficient of the impact body is the impact force of JIS standard. It does not change so that the time characteristic is not satisfied, and the usable temperature range of the impact source is expanded.

[Brief description of the drawings]

FIG. 1 is a plan view of an impact sound generator showing a half of a support seat plate removed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view of an apparatus using an impact sound generator.

FIG. 4 is a partially enlarged front view of FIG. 3;

FIG. 5 is a time characteristic diagram of an impact force according to the JIS standard.

FIG. 6 is a front view showing the operation of the impact body lifting device.

FIG. 7 is a front view showing the operation of the impact body lifting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impact body 2 Impact part 3 Column part 4 Support body 6 Spacer 7 Nut 8 Support seat plate 11 Impact sound generator 12 Mounting rod 16 Floor to be measured 20 Friction wheel 23 Driving force transmission lever 24 Disengagement wheel 25 Cam 27 Coil spring

Claims (1)

[Claims] 1. A solid impact body consisting of a cylindrical portion and a hemispherical impact portion provided on one end surface thereof is integrally molded with an elastic body such as rubber, and a predetermined distance from the other end surface of the cylindrical portion. An impact sound generator, wherein a support seat plate arranged at a distance is supported by supports provided at intervals along the circumference of the cylindrical portion.