JP7173462B2 - Suspended object damping structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a suspended object vibration damping structure.

A suspended object such as a chandelier suspended from the slab of a building does not provide much damping to the shaking of this suspended object, so it shakes greatly during an earthquake, and this shaking continues for a long time even after the earthquake.

Patent Literature 1 discloses a technology related to a suspended object vibration damping structure that reduces vibration of a suspended object. In this prior art, a suspended object is connected via a wire to the lower end of a shaft-like member whose upper end is swingably suspended from a slab. An oscillating body is provided between the upper end portion and the lower end portion of the shaft-like member, and vibration of the oscillating body is damped by damping means.

Therefore, when the slab shakes due to an earthquake, strong wind, or the like, and the shaft-like member swings around the upper end portion as a fulcrum, the damping means damps the swinging motion of the swinging body provided on the shaft-like member. As a result, swinging of the shaft-shaped member is reduced, and as a result, swinging of the hanging object connected to the shaft-shaped member via the linear member is reduced.

JP 2018-4046 A

In Patent Literature 1, an insertion hole is formed in the ceiling material under the slab, and a wire connected to the lower end of the shaft-like member and attached to the suspended object is inserted through the insertion hole. The through-hole of the ceiling material must be of a size that does not interfere with the wire connected to the shaft-shaped member that swings about its upper end due to earthquakes, strong winds, or the like.

However, if the insertion hole of the ceiling material becomes large, the design is deteriorated. Therefore, it is required to reduce the size of the insertion hole in the ceiling material under the slab.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to effectively suppress the vibration of a suspended object and to reduce the size of an insertion hole formed in a ceiling material under a slab on which the suspended object is suspended.

A first aspect includes a ceiling material provided at intervals under a slab and having an insertion hole formed therein, a shaft-like member inserted through the insertion hole and having a suspended object connected to the lower end thereof, and a structure supporting means for supporting the shaft-like member so that the shaft-like member swings around an intermediate portion between the lower end portion and the upper end portion of the shaft-like member; damping means for damping the suspended object vibration damping structure.

In the first aspect, when the shaft-shaped member having the lower end connected to the suspended object swings about the center of rotation due to an earthquake, strong wind, or the like, the damping means imparts damping to the shaft-shaped member. Swaying of objects is reduced. Since the center of rotation when the shaft-shaped member swings is the intermediate portion between the lower end and the upper end of the shaft-shaped member, the insertion hole is more likely to rotate than when the shaft-shaped member swings around the upper end. The swinging width of the shaft-like member at the position of is reduced. Therefore, the insertion hole of the ceiling material through which the shaft-like member is inserted can be made smaller.

In a second aspect, the support means includes: a spherical portion provided in the intermediate portion of the shaft-like member; and a support member provided in the structure for rotatably supporting the spherical portion. It is a suspended object vibration damping structure according to the first aspect.

In the second aspect, the support member receives the load of the shaft-shaped member and the suspended object, and rotatably supports the intermediate portion of the shaft-shaped member. Therefore, the structure of the support means for rotatably supporting the intermediate portion of the shaft-like member is simple, and the cost is low.

In a third aspect, the support means includes a slider fixed to the structure and supporting the upper end portion of the shaft-like member so as to be horizontally movable ; The vibration damping structure for a suspended object according to the first aspect, further comprising a support member that rotatably supports the intermediate portion so as to be vertically movable.

In the third aspect, the slider provided on the slab receives the load of the shaft-shaped member and the suspended object. A support member provided on the slab supports the intermediate portion of the shaft-like member so as to be rotatable so as to be vertically movable. Therefore, the shaft-like member swings about the intermediate portion as the center of rotation. The slider receives and bears the load of the shaft-shaped member and the suspended object. Therefore, objects with a large load can be hung.

According to the present invention, it is possible to reduce the size of the insertion hole formed in the ceiling material under the slab on which the object is hung.

(A) is a front view of the suspension vibration damping structure of the first embodiment, and (B) is a horizontal cross-sectional view along line 1B-1B of (A). (A) is a front view of a stationary lighting fixture, and (B) is a front view of a swinging lighting fixture. It is a front view of the suspended article damping structure of the 1st modification of 1st embodiment. It is a front view of the suspended article damping structure of the 2nd modification of 1st embodiment. (A) is a front view of the suspension vibration damping structure of the second embodiment, (B) is a plan view of the slider, and (C) is a horizontal cross-sectional view along line 5C-5C in (A). be. (A) is an enlarged vertical cross-sectional view along the X direction of the portion provided with the spherical plain bearing of FIG. , (C) is a plan view of a portion provided with a spherical plain bearing. It is a front view which shows typically the suspension object vibration damping structure of a 1st comparative example. (A) is a front view of a suspended object vibration damping structure of a second comparative example, and (B) is a front view of a suspended object vibration damping structure of this embodiment. (A) shows the relationship between the amplitude ratio and the normalized frequency when the specifications of the suspended object vibration damping structure of the second comparative example in FIG. 8B is a graph showing the amplitude ratio and normalized frequency when the specifications of the suspended object vibration damping structure of the present embodiment in FIG. is a graph showing the relationship between

<First Embodiment>
A vibration damping structure for a suspended object according to a first embodiment of the present invention will be described. Note that the two orthogonal horizontal directions are the X direction and the Y direction, which are indicated by arrows X and Y, respectively. A vertical direction orthogonal to the X direction and the Y direction is defined as a Z direction and indicated by an arrow Z. As shown in FIG.

[structure]
As shown in FIG. 1A, a suspended object vibration damping structure 100 of the present embodiment includes a ceiling material 20, a rigid rod 110, a rigid plate 300, a support mechanism 150, and a damper 120, and is an example of a suspended object. A lighting fixture 50 such as a chandelier is hung.

The ceiling material 20 is provided under the slab 10 with an interval therebetween, and an insertion hole 22 is formed.

A rigid rod 110 as an example of a shaft-like member is inserted through the insertion hole 22 of the ceiling material 20 . A lighting fixture 50 is connected to the lower end portion 110A of the rigid rod 110 . The lighting fixture 50 has a wire rod 52 as an example of a connecting member connected to the lower end portion 110A of the rigid rod 110, and a lighting portion 54 as an example of a hung object main body attached to the wire rod 52. .

A support mechanism 150, which is an example of a support means, is provided on the slab 10, which is an example of a structural body , so that the intermediate portion 110C between the lower end portion 110A and the upper end portion 110B of the rigid rod 110 is pivoted around the center of rotation. , supporting the rigid rod 110 . In addition, the intermediate portion 110</b>C is positioned near the upper side of the insertion hole 22 of the ceiling material 20 .

The support mechanism 150 has a spherical portion 112 and a support member 152 . The spherical portion 112 is a hemispherical portion provided in the intermediate portion 110C of the rigid rod 110 and having a spherical lower half.

The support member 152 has four support portions 154 and a spherical plain bearing 160 supported by the support portions 154 . The four support portions 154 are composed of arms 156 extending in the vertical direction and horizontal portions 158 extending horizontally from the lower ends of the arms 156, forming an L shape. The support portions 154 are each fixed to the slab 10 at the upper ends of the arms 156 .

As shown in FIG. 1B, the support portions 154 are arranged on both outer sides in the X direction and both outer sides in the Y direction across the insertion hole 22 (see FIG. 1A) in plan view in the Z direction. are placed. In addition, in FIG. 1B, the rigid rod 110 is illustrated with a broken line.

As shown in FIG. 1A, the horizontal portions 158 of the four support portions 154 are arranged close to above the ceiling material 20 and extend toward the insertion holes 22, respectively. The aforementioned spherical plain bearing 160 is fixed to the tip of each horizontal portion 158 . In this embodiment, the spherical plain bearing 160 is bolted to the tip of the horizontal portion 158 of the support portion 154 (see also FIG. 6).

As shown in FIG. 6(A), a spherical plain bearing 160 as an example of a bearing has a spherical concave seat 164 with a through hole 162 formed in the central portion (see also FIG. 6(C)). ). Note that the through hole 162 expands in diameter downward. The rigid rod 110 is inserted through the through hole 162 , and the spherical portion 112 of the intermediate portion 110</b>C is fitted into the recessed seat 164 .

Therefore, as shown in FIGS. 6A and 6B, the rigid rod 110 can swing in two horizontal directions, the X direction and the Y direction, about the spherical surface portion 112 of the intermediate portion 110C. supported by That is, as shown in FIGS. 2A and 2B, the rigid rod 110 is supported so as to swing around the intermediate portion 110C positioned near the upper side of the insertion hole 22 of the ceiling material 20 as the center of rotation. ing.

As shown in FIG. 1B, four dampers 120 as an example of damping means are provided in this embodiment. As shown in FIGS. 1(A) and 1(B), the damper 120 is arranged along the horizontal direction, and one end of the damper 120 is connected to the upper end 110B (see FIG. 1(A)) of the rigid rod 110 by a ball joint 122. , and the other end is connected to an arm portion 156 of a support portion 154 via a ball joint 122 .

A rigid plate 300 as an example of a rocking member is provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110 . The rigid plate 300 of the present embodiment is a rectangular steel plate material in a plan view. In addition, by adjusting the size, mass, position, etc. of the rigid plate 300, the natural period of oscillation of the rigid rod 110 on which the rigid plate 300 is provided can be tuned to the natural period of oscillation of the lighting section 54 of the lighting device 50. I am letting

Here, the above-mentioned "synchronizing the natural period of oscillation of the rigid rod 110 provided with the rigid plate 300 with the natural period of the oscillation of the illumination section 54 of the lighting fixture 50" will be described.

By adjusting the size, mass, position, etc. of the rigid plate 300, the natural period of the primary mode and the secondary mode of the vibration system composed of the rigid rod 110 and the lighting fixture 50 can be adjusted based on the fixed point theory. By adjusting the damping coefficient of the damper 120 in a state where the amplitude ratio of the fixed points P and Q appearing in the transfer function is the same, a vibration characteristic is obtained in which the amplitude ratio of the fixed points P and Q is the maximum amplitude ratio on the transfer function. That is.

[Action and effect]
Next, the operation and effects of this embodiment will be described.

As shown in FIG. 2(B), when the slab 10 shakes due to an earthquake, strong wind, or the like, the rigid rod 110 to which the lighting device 50 is connected swings around the intermediate portion 110C. However, the damper 120 provides damping to the rigid rod 110 , thereby reducing the swinging of the lighting portion 54 of the lighting fixture 50 . In addition, this shortens the duration of the shaking of the lighting unit 54 of the lighting device 50 .

In addition, in FIG. 2B, the lighting fixture 50 is swinging along the X direction, but it is not limited to this. The luminaire 50 can swing in any horizontal direction.

Since the rigid rod 110 swings around the intermediate portion 110C positioned near the upper side of the insertion hole 22 of the ceiling material 20, the swing width of the rigid rod 110 at the position of the insertion hole 22 is small. Therefore, the insertion hole 22 of the ceiling material 20 through which the rigid rod 110 is inserted can be made smaller. Therefore, deterioration of the design of the ceiling material 20 due to the formation of the insertion holes 22 is suppressed.

The insertion hole 22 may be closed with a closing member made of a material that allows the rigid rod 110 to swing. Even in that case, if the blocking member is large, the designability is degraded. However, as described above, if the insertion hole 22 is small, the blocking member is also small, so the deterioration of the design is suppressed.

Further, the support portion 154 receives the load of the rigid rod 110 and the lighting fixture 50, and supports the intermediate portion 110C of the rigid rod 110 so as to be rotatable. Therefore, compared with the case where the member that receives the load of the rigid rod 110 and the lighting fixture 50 and the member that rotatably supports the intermediate portion 110C are separate members, the structure is simple and the cost is low.

Further, as shown in FIG. 2A, the distance L1 between the spherical portion 112 of the intermediate portion 110C, which is the center of rotation of the rigid rod 110, and the lower end portion 110A of the rigid rod 110, and the distance L1, which is the center of rotation of the rigid rod 110, By changing the ratio of the distance L2 between the spherical portion 112 of the portion 110C and the connection position of the damper 120, the damping effect of the damper 120 can be adjusted.

Here, the suspended object vibration damping structure 500 of the first comparative example shown in FIG. 7 will be described.

In the suspended object vibration damping structure 500 of the first comparative example, the damper 560 is connected to the rigid rod 110 and the slab 10 , and the upper end portion 110B of the rigid rod 110 is connected to the slab 10 via the ball joint 122 . Therefore, the rigid rod 110 swings around the upper end portion 110B. Therefore, the swing width of the lower end portion 110A to which the lighting fixture 50 is connected is large, and therefore the insertion hole 23 of the ceiling material 20 needs to be enlarged. Therefore, the designability of the ceiling material 20 is greatly deteriorated by forming the insertion holes 23 .

On the other hand, as shown in FIGS. 1 and 2, in the suspended object vibration damping structure 100 of the present embodiment, the rigid rod 110 rotates the intermediate portion 110C positioned near the upper side of the insertion hole 22 of the ceiling material 20. Since it swings about the center, the swing width of the rigid rod 110 at the position of the insertion hole 22 becomes small. Therefore, the insertion hole 22 of the ceiling member 20 through which the rigid rod 110 is inserted can be made smaller than the through hole 23 of the first comparative example (see FIG. 7).

In addition, in this embodiment, a rigid plate 300 is provided between the upper end portion 110B of the rigid rod 110 and the intermediate portion 110C. By adjusting the size, mass, position, etc. of the rigid plate 300 , the natural period of oscillation of the rigid rod 110 is synchronized with the natural period of oscillation of the lighting section 54 of the lighting device 50 . Therefore, the shaking of the illumination part 54 of the lighting device 50 is effectively suppressed.

Here, FIG. 8B is a front view of the suspended object vibration damping structure 100 of this embodiment. FIG. 8A is a front view of a suspended object vibration damping structure 600 of a second comparative example in which the upper end portion 110B of the rigid rod 110 is the center of rotation. In both FIGS. 8A and 8B, illustration of damping means is omitted.

The specifications of the suspended object vibration damping structure 600 of the second comparative example in FIG. 8A and the suspended object vibration damping structure 100 of the present embodiment in FIG. is set to satisfy

In [Equation 1],
_I2 is the rotational moment of inertia of rigid plate 300,
m ₁ is the mass of the lighting section 54 of the lighting fixture 50,
m ₂ is the mass of the rigid plate 300,
G1 is the center _- of-gravity position of the lighting unit 54 of the lighting fixture 50,
_G2 is the center of gravity position of the rigid plate 300,
L1 is the distance between the connection position K1 where the wire rod 52 of the lighting device ₅₀ is connected to the lower end portion 110A of the rigid rod 110 and the center _- of _- gravity position G1 of the lighting portion 54 of the lighting device 50,
L ₂ is the distance between the connection position K ₁ and the rotation center position K ₂ of the rigid rod 110,
L ₃ is the distance between the rotation center position K ₂ and the gravity center position G ₂ of the rigid plate 300 .

In the case of this embodiment shown in FIG. 8B, since the direction of the distance L ₃ is opposite, −(minus) L ₃ is introduced into [Equation 1]. That is, if the distance is, for example, 200 mm, calculate with -200 mm.

The specifications of the suspended object vibration damping structures 100 and 600 are set so as to satisfy the tuning condition of this [Equation 1], and the natural period of the swing of the rigid rod 110 is set to By tuning to the natural period, it is possible to effectively reduce the shaking of the lighting section 54 of the lighting device 50 .

Then, when setting each item so as to satisfy the tuning condition of [Equation 1] and effectively reducing the shaking of the lighting unit 54 of the lighting fixture 50, the suspension of the second comparative example in FIG. The mass m ₂ of the rigid plate 300 in the suspended object vibration damping structure 100 of this embodiment in _FIG . Therefore, this will be explained next.

FIG. 9A shows the relationship between the standardized frequency and the amplitude ratio Z when the suspended object vibration damping structure 600 of the second comparative example in FIG. graph. Similarly, FIG. 9B shows the relationship between the normalized frequency and the amplitude ratio Z when the suspended object vibration damping structure 100 of the present embodiment in FIG. 8B satisfies the tuning condition of [Equation 1] is a graph showing

Note that the normalized frequency f/f1, which is the horizontal axis of _each graph, is the natural frequency f of the slab 10 when it is assumed that the lighting fixture 50 is directly suspended from the slab 10 (not via the rigid rod 110). is a value obtained by dividing by the natural frequency f1 (a normalized value of f).

Further, the amplitude ratio Z is defined as the displacement amplitude of the vibration component included in the displacement of the slab 10 due to an earthquake or the like, which is _y0 , and the displacement amplitude of the vibration component included in the displacement of the lighting unit 54 of the lighting fixture 50 with respect to the slab 10. is the _ratio when y1. Also, when the tuning condition of [Equation 1] is satisfied, the amplitude ratio Z of the two fixed points P and Q based on the fixed point theory is the same value, and the value is obtained by [Equation 2].

Analysis conditions and specifications of the suspended object vibration damping structure 600 of the second comparative example shown in FIG. 8(A) are shown below.
m1: _230kg
m2 : 170kg
L1: _4000mm
L2: _500mm
L3: _200mm

Further, the analysis conditions and specifications of the suspended object vibration damping structure 100 of the present embodiment shown in FIG. 8B are shown below. The mass m ₂ of the rigid plate 300 is 85 kg, which is half the mass m ₂ of the rigid plate 300 of the suspension vibration damping structure 600 of the second comparative example shown in FIG. 8(A), which is 170 kg. Also, (L ₁ and m ₁ ) and the ceiling height of the lighting fixture 50 in both are the same. The “ceiling height” is the distance between the slab 10 and the ceiling material 20 .
m1: 230 _kg
m2 : 85 kg
L1: _4000mm
L2 : 100mm
L ₃ : 200 mm (-200 mm as described above when substituting in [Equation 1] and [Equation 2])

Case 1 in the graphs of FIGS. 9(A) and 9(B) is a case in which a damping coefficient that allows the value of the amplitude ratio of fixed points P and Q of the transfer function to be the value of the maximum amplitude ratio on the transfer function is adopted. Case 2 is when the damping coefficient of the damper, which is the damping means, is set to infinity (∞), and Case 3 is when the damping coefficient of the damper, which is the damping means, is set to zero.

The amplitude ratio Z at the fixed point position (P point, Q point) in the fixed point theory for case 1 in FIGS. 9A and 9B is both about 4.7. That is, the amplitude ratio Z at the fixed point position when the mass _m2 of the rigid plate 300 in the suspended object vibration damping structure 600 of the second comparative example in FIG. The amplitude ratio Z at the fixed point position when the mass _m2 of the rigid plate 300 in the suspended object vibration damping structure 100 is 85 kg is approximately 4.7.

Therefore, when setting the specifications so as to satisfy the tuning condition of [Equation 1] and effectively reducing the shaking of the lighting unit 54 of the lighting fixture 50, the suspended object of the second comparative example in FIG. It is possible to make the mass _m2 of the rigid plate 300 in the vibration damping structure 100 of the embodiment shown in _FIG . can.

[Modification]
Next, a modified example of this embodiment will be described.

(first modification)
In the suspended object vibration damping structure 102 shown in FIG. 3, the damper 120 is arranged obliquely with respect to the horizontal direction, one end is connected to the lower side of the upper end 110B of the rigid rod 110 via the ball joint 122, and the other The ends are connected to the slab 10 via ball joints 122 .

In the first modified example, the support portion 154 that constitutes the support member 152 does not receive the reaction force of the damper 120, so the rigidity can be reduced accordingly.

(Second modification)
In the suspended object vibration damping structure 104 shown in FIG. 4 , the arm portion 157 of the support portion 155 that constitutes the support member 153 of the support mechanism 151 extends obliquely from the slab 10 with respect to the vertical direction, and extends horizontally from the lower end of the arm portion 157 . A horizontal portion 159 extends in the direction. The damper 120 is arranged along the horizontal direction, one end is connected to the upper end 110B of the rigid rod 110 via a ball joint 122, and the other end is connected to the fixed portion 130 provided on the slab 10. connected through

In the second modification, the support portion 155 that constitutes the support member 153 does not receive the reaction force of the damper 120, so the rigidity can be reduced accordingly. In addition, since the damper 120 is arranged along the horizontal direction, it is possible to exert a damping force more effectively than in the configuration in which the damper 120 is arranged obliquely as in the first modified example.

<Second embodiment>
A suspended object vibration damping structure according to a second embodiment of the present invention will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and overlapping descriptions are simplified or omitted.

[structure]
As shown in FIG. 5(A), the suspended object vibration damping structure 200 of this embodiment includes a ceiling material 20, a rigid rod 110, a rigid plate 300, a support mechanism 250, and a damper 120. As shown in FIG. The rigid rod 110 is inserted through the insertion hole 22 of the ceiling material 20, and the lighting fixture 50 is connected to the lower end portion 110A.

A support mechanism 250, which is an example of a support means, is provided on the slab 10, which is an example of a structure , and supports the rigid rod 110 so that the intermediate portion 110C of the rigid rod 110 swings about the center of rotation. The support mechanism 250 has a slider 280 and a support member 252 .

As shown in FIGS. 5A and 5B, the slider 280 is an XY linear slider in which a first linear slider 282 along the Y direction and a second linear slider 284 along the X direction are combined. be. The slider 280 is fixed to the slab 10 as an example of the structure , and supports the upper end portion 110B (see FIG. 5A) of the rigid rod 110 so as to be movable in two horizontal directions, the X direction and the Y direction. The slider 280 of this embodiment is provided with a first linear slider 282 along the Y direction and a second linear slider 284 along the X direction. A joint member 285 is attached to the second linear slider 284 on the lower side, and the rigid rod 110 is attached to the joint member 285 .

As shown in FIG. 5A, the support member 252 has four support portions 154 and an annular member 260 provided on the support portions 154 .

As shown in FIGS. 5A and 5C, the annular member 260 is fixed to the tip of the horizontal portion 158 of the support portion 154. As shown in FIGS. Also, the rigid rod 110 is inserted through the hole 262 of the annular member 260 . Therefore, the intermediate portion 110C of the rigid rod 110 is rotatably supported while allowing vertical movement. From another point of view, the intermediate portion 110C of the rigid rod 110 is movable in the vertical direction, but its movement in two horizontal directions is restricted.

As shown in FIG. 5A, the damper 120 is arranged along the horizontal direction, one end is connected to the upper end 110B of the rigid rod 110 via a ball joint 122, and the other end is connected to the support portion 154. It is connected to arm 156 via ball joint 122 .

A rigid plate 300 as an example of a rocking member is provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110 . By adjusting the size, mass, position, etc., of the rigid plate 300, the natural period of oscillation of the rigid rod 110 provided with the rigid plate 300 is synchronized with the natural period of oscillation of the illumination section 54 of the lighting device 50. there is

[Action and effect]
Next, the operation and effects of this embodiment will be described.

When the slab 10 shakes due to an earthquake, strong wind, or the like, the upper end portion 110B of the rigid rod 110 fixed to the slider 280 moves horizontally. The intermediate portion 110C of the rigid rod 110 is rotatably supported by the annular member 260 while allowing vertical movement (movable in the vertical direction, but limited in movement in two horizontal directions). ing). Therefore, the rigid rod 110 swings around the annular member 260 . In other words, the rigid rod 110 swings around the intermediate portion 110C, and the lighting device 50 swings. In the case of this embodiment, the lower end portion 110A of the rigid rod 110 moves up and down due to the rocking motion of the rigid rod 110, and the lighting device 50 also moves up and down accordingly.

However, the damper 120 provides damping to the rigid rod 110 , thereby reducing the swinging of the lighting fixture 50 . In addition, this shortens the duration of the shaking of the lighting unit 54 of the lighting device 50 .

In addition, in this embodiment, by adjusting the size, mass, position, etc., of the rigid plate 300 provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110, the unique swing motion of the rigid rod 110 can be controlled. The period is tuned to the natural period of the swing of the lighting section 54 of the lighting fixture 50 . Therefore, the swinging of the lighting section 54 of the lighting device 50 is effectively suppressed.

Since the rigid rod 110 swings around the intermediate portion 110C positioned near the upper side of the insertion hole 22 of the ceiling material 20, the swing width of the rigid rod 110 at the position of the insertion hole 22 becomes small. Therefore, the insertion hole 22 of the ceiling material 20 through which the rigid rod 110 is inserted can be made smaller.

Therefore, deterioration of the design of the ceiling material 20 due to the formation of the insertion holes 22 is suppressed. In addition, when the rigid rod 110 closes the insertion hole 22 with a rockable closing member, the deterioration of the design is suppressed.

Further, the load of the rigid rod 110 and the lighting fixture 50 is received by the slider 280 provided on the slab 10, and the supporting member 252 does not bear the load.

In addition, the distance L1 (see FIG. 2A) between the position where the intermediate portion 110C, which is the center of rotation of the rigid rod 110, is inserted through the annular member 260 and the lower end portion 110A of the rigid rod 110, The damping effect of the damper 120 is changed by changing the ratio of the distance L2 (see FIG. 2A) between the position where the intermediate portion 110C, which is the rotation center, is inserted through the annular member 260 and the connection position of the damper 120. can be adjusted.

<Others>
It should be noted that the present invention is not limited to the above embodiments.

In the above embodiment, the rigid plate 300 is provided on the rigid rod 110, but the present invention is not limited to this. A rocking member other than the rigid plate 300 may be provided on the rigid rod 110 . Further, the rigid rod 110 may not have a rocking member such as the rigid plate 300 .

Further, in the above embodiment, the shaft-like member was the linear rigid rod 110, but it is not limited to this. A shaft-like member other than the rigid rod 110 may be used.

Moreover, in the above-described embodiment, the hanging object is the lighting fixture 50 such as the chandelier, but the hanging object is not limited to this. Hanging objects may be electrical decorations, speakers, display panels, objects, and the like. Further, in the above-described embodiment, the wire rod constituting the suspended object is connected to the lower end portion of the shaft-like member, but the present invention is not limited to this. The hanging object may be composed of a connecting member other than a wire (for example, a rod or a hook) and a main body of the hanging object, and the connecting member other than the wire may be connected to the lower end of the shaft-like member. Furthermore, the suspended object may be directly connected to the lower end of the shaft-like member without having a connecting member.

Moreover, in the above-described embodiment, the structure to which the load of the suspended object and the shaft member is applied is the slab 10, but it is not limited to this. A structure other than the slab 10, such as a beam under the slab 10, may be loaded. For example, in the case of the first embodiment, the upper end portion of the arm portion 156 of the support portion 154 is fixed to the beam, and in the case of the second embodiment, the slider 280 is fixed to the beam. .

Further, in the above-described embodiment, the damper 120 is configured to receive the reaction force from the slab 10, but the present invention is not limited to this. A structure other than the slab 10, such as a beam, may be configured to receive the reaction force. For example, in the case of the first modification of the first embodiment, the other end of the damper 120 is connected to the beam via the ball joint 122, and in the case of the second modification of the first embodiment, it is fixed. The structure is such that the portion 130 is provided on the beam, and in the case of the second embodiment, the structure is such that the arm portion 156 of the support portion 154 is fixed to the beam.

Note that the structure to which the load of the hanging object and the shaft-shaped member is applied and the structure to which the reaction force of the damper 120 is applied may be separate.

In addition, the multiple embodiments and modifications described above can be implemented in appropriate combinations.

Furthermore, various aspects can be implemented without departing from the gist of the present invention.

10 Slab (an example of a structure )
20 Ceiling material 22 Insertion hole 50 Lighting equipment (an example of hanging objects)
REFERENCE SIGNS LIST 100 Hanging object vibration damping structure 102 Hanging object vibration damping structure 104 Hanging object vibration damping structure 110 Rigid rod (an example of a shaft-shaped member)
110A lower end portion 110B upper end portion 110C intermediate portion 112 spherical portion 120 damper (an example of damping means)
150 support mechanism (an example of support means)
151 support mechanism (an example of support means)
152 support member 153 support member 200 suspended object vibration damping structure 250 support mechanism (an example of support means)
252 support member 280 slider 300 rigid plate (an example of a swing member)

Claims (5)

A ceiling material provided at intervals under a structure that is a slab or beam and having an insertion hole formed therein;
a shaft-shaped member that is inserted through the insertion hole and has a lower end connected to a hanging object;
a support mechanism provided in the structure and arranged with a gap from the ceiling material;
a support member that is provided in the support mechanism and supports the shaft-shaped member so that an intermediate portion between the lower end portion and the upper end portion of the shaft-shaped member swings about a center of rotation;
a damper that is provided on the support member or the structure and dampens swinging of the shaft-like member;
Hanging object vibration damping structure. The support mechanism is
a spherical portion provided in the intermediate portion of the shaft-like member;
a spherical plain bearing provided in the support member and rotatably supporting the spherical portion;
having
The suspended object vibration damping structure according to claim 1. a ceiling material provided at intervals under the structure and formed with an insertion hole;
a shaft-shaped member that is inserted through the insertion hole and has a lower end connected to a hanging object;
a slider that is fixed to the structure and supports the upper end of the shaft-like member so as to be horizontally movable;
A support member that is provided in the structure and supports an annular member that restricts movement in two horizontal directions while allowing vertical movement of an intermediate portion between the lower end portion and the upper end portion of the shaft-shaped member. When,
a damper that is provided on the support member or the structure and dampens swinging of the shaft-like member;
Hanging object vibration damping structure. A swinging member is provided between the upper end portion and the intermediate portion of the shaft-like member for synchronizing the natural period of swinging of the shaft-like member with the natural period of swinging of the hanging object.
A vibration damping structure for a suspended object according to any one of claims 1 to 3. The damping coefficient of the damper is adjusted to maximize the value of the amplitude of the fixed-point position transfer function .
The suspended object vibration damping structure according to claim 4.

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