JP5836057B2 - Vibration device - Google Patents

Description

  The present invention relates to a vibration device, and in particular, relates to a vibration device that reproduces vibrations received in actual operating conditions by components mounted on automobiles, aircraft, buildings, and the like.

  Non-Patent Document 1 discloses a conventional vibration device shown in FIG. This vibration device includes one vibration exciter 102 that imparts vibration in the horizontal X-axis direction to the vibration table 101, two vibration exciters 103 that impart vibration in the horizontal Y-axis direction, and a vertical Z-axis. Three vibration exciters 104 are provided for applying directional vibrations. Each of the vibrators 102, 103, and 104 has a vibration shaft 105 that reciprocates on an axis. The vibration exciters 102 and 103 that apply vibration to the vibration table 101 in the horizontal X-axis direction and the horizontal Y-axis direction are connected to the vibration table 101 via a vibration rod 106 connected to the tip of the vibration shaft 105. It is connected. The vibration exciter 102 that applies vibration in the horizontal X-axis direction to the vibration table 101 is an upper part of the support table 108 that is erected on the foundation floor 107 so that the reciprocating motion of the vibration shaft 105 is in the horizontal X-axis direction. It is supported by. Further, the vibration exciter 103 that applies vibration in the horizontal Y-axis direction to the vibration table 101 includes two pieces that are erected on the foundation floor 107 so that the reciprocating motion of the vibration shaft 105 is in the horizontal Y-axis direction. It is supported separately on the upper part of the support base 108. The vibrators 102 and 103 are supported on the upper portion of the support base 108 so as to be substantially the same height as the vibration base 101.

Thus, this vibration device arranges the vibration exciters 102 and 103 that apply vibration to the vibration table 101 in the horizontal X-axis direction and the horizontal Y-axis direction at substantially the same height as the vibration table 101, In addition, the direction in which the excitation shaft 105 of each of the vibrators 102 and 103 reciprocates is the same as the vibration applied to the vibration table 101. Therefore, the vibration device can tell efficiently vibrating table 1 01 a displacement amount of force and pressure vibratory shaft of each of the vibrators 102 and 103 are generated by a simple structure.

  Non-Patent Document 2 discloses another conventional vibration device shown in FIG. This vibration device also has one shaker 112 for applying vibration in the horizontal X-axis direction, two shakers for applying vibration in the horizontal Y-axis direction, and vertical Z-axis direction to the vibration table 111. Three vibrators 113 for applying vibration are provided. Each of the vibrators 112 and 113 has a vibration shaft 115 that reciprocates on an axis. Each vibration exciter 112 that applies vibration to the vibration table 111 in the horizontal X-axis direction and the horizontal Y-axis direction uses the space below the vibration table 111 to move the excitation shaft 115 diagonally up and down. It is mounted on the foundation floor 117 so as to reciprocate. In these vibration exciters 112, the tip of the vibration shaft 115 is connected to the power point 121 of the bell crank 120. The bell crank 120 has a fulcrum 122 connected to an upper portion of a support base 130 fixed on the foundation floor 117. Further, the bell crank 120 has one end of an excitation rod 116 connected to the operating point 123. The other end of the excitation rod 116 is connected to the vibration table 111.

  As described above, the vibration device can convert the reciprocating motion of the excitation shaft 115 in the oblique vertical direction into the reciprocating motion in the horizontal direction by using the bell crank 120. That is, the direction of the excitation force of the shaker 112 can be converted. In addition, the vibration device uses the bell crank 120 and supports the vibration table 111 with vibrations applied to the vibration table 111 in the horizontal X-axis direction and the horizontal Y-axis direction, and the bell crank 120 fixed thereto. The stand 130 is separately fixed on the foundation floor 117. For this reason, these resonances can be suppressed and the vibration table 111 can be vibrated satisfactorily. Furthermore, this vibration device saves space because the vibrators 112 that give vibrations in the horizontal X-axis direction and the horizontal Y-axis direction to the vibration table 111 are arranged in a vacant space below the vibration table. Can be achieved.

MAST Multi-Axis Shaking Tables. page 2. “6-DOF Radiator faction simulation drawing”. [Online]. Instron Structural Testing Systems Corporation. [Retrieved on 2011-08-17]. Retrieved from the Internet: <URL: http: // www. instron. com / wa / library / StreamFile. aspx? doc = 397> MAST ™ Systems. Multi Axial Simulation Tables for Squeeak and Rattle, Modal, and Durability Testing of Vehicle Components and Subsembles. page 2,6,9. [Online]. MTS Systems Corporation. [Retrieved on 2011-08-17]. Retrieved from the Internet: <URL: http: // www. mts. com / ucm / groups / public / documents / library / dev_002251. pdf>

  However, the vibration device of Non-Patent Document 1 includes a vibration table 101, a specimen placed on the vibration table 101, and a vibrator that applies vibrations to the vibration table 101 in the horizontal X-axis direction and the horizontal Y-axis direction. When the total mass of 102 and 103 is large, the resonance frequency formed by these components and the rigidity of the support base 108 in the vibration direction becomes low. In general, it is a principle that the vibration device is operated in a frequency band lower than the resonance frequency while avoiding the occurrence of resonance. For this reason, when the resonance frequency is low as described above, the operating frequency band is narrowed and lacks practicality.

  In addition, the vibration device of Non-Patent Document 2 includes a bell crank 120 provided between the vibration table 111 and the vibration table 112 that applies vibration to the vibration table 111 in the horizontal X-axis direction and the horizontal Y-axis direction. Vibration is transmitted. At this time, since the direction of the excitation force of the shaker 112 is changed, transmission loss of the excitation force may be caused depending on the arrangement state of the shaker 112 and the bell crank 120. In other words, the force of the vibrator 112 and the displacement amount of the vibration shaft 115 may not be efficiently transmitted to the shaking table. For this reason, the vibration exciter 112 that applies vibration to the vibration table 111 in the horizontal X-axis direction and the horizontal Y-axis direction needs to have a large excitation force. Furthermore, the capacity of the hydraulic power source for driving these vibrators 112 inevitably increases. Therefore, there is a risk that this vibration device may have high manufacturing costs and operating costs (power consumption).

  The present invention has been made in view of the above-described conventional circumstances, and has a wide operating frequency band, and can vibrate well even if the specimen placed on the shaking table is heavy, and the manufacturing cost The problem to be solved is to provide a vibration device capable of reducing the operating cost.

The vibration device of the present invention includes a vibration table on which a specimen is placed;
The vibration device includes a vibrator main body and a vibration shaft that protrudes from the vibrator main body and reciprocates on an axis and applies a horizontal vibration to the vibration table. And
The exciter is fixed so that the excitation shaft reciprocates in the horizontal direction , and a mass is arranged on the installation floor so as to be movable in the horizontal direction , which is the direction in which the excitation shaft reciprocates.
An elastic body that movably holds the mass in a direction in which the excitation shaft reciprocates with respect to the installation floor,
The total mass of the shaker and the mass is larger than the mass of the shaking table.

  In the vibration device of the present invention, the total mass of the vibrator and the mass is larger than the mass of the vibration table. For this reason, the resonance frequency depends exclusively on the mass of the mass, and more specifically, it is determined in consideration of the elastic force of the elastic body. Therefore, this vibration device can set the resonance frequency to a range lower than the operating frequency band by increasing the mass of the mass, and can eliminate the influence of resonance in the operating frequency band.

  Further, in this vibration device, the total mass of the vibrator and the mass is larger than the mass of the vibration table, so that the moving amount of the mass is small and the moving speed is slow. For this reason, this vibration device can easily predict the moving amount and moving speed of the mass caused by the reaction of the reciprocating motion of the excitation shaft. Therefore, this vibration device can control the reciprocating motion of the excitation shaft based on the prediction, and can apply the desired vibration to the vibration table.

  In addition, since the vibration shaft reciprocates in the same horizontal direction as the vibration applied to the vibration table, the vibration device efficiently transmits the force generated by the vibration exciter and the displacement amount of the vibration shaft to the vibration table. Can do. For this reason, this vibration apparatus can make the performance of a vibration exciter the minimum necessary. As a result, this vibration device can also minimize the hydraulic source for driving the vibration exciter. Therefore, this vibration device can reduce manufacturing costs and operating costs (power consumption).

  Therefore, the vibration device of the present invention has a wide operating frequency and can vibrate well even if the specimen placed on the vibration table is heavy, and can reduce the manufacturing cost and the operating cost. it can.

1 is a schematic diagram of a vibration device according to Example 1. FIG. 6 is a perspective view of a vibration device according to Embodiment 2. FIG. 6 is a plan view of a vibration device according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view illustrating a main part of a vibration device according to a second embodiment. It is a perspective view which shows the conventional vibration apparatus. It is a side view which shows another conventional vibration apparatus.

  Embodiments 1 and 2 embodying the vibration device of the present invention will be described with reference to the drawings.

<Example 1>
FIG. 1 schematically shows a vibration device according to the first embodiment. In this vibration device, the vibration table 10 vibrates in the horizontal direction (left-right direction in FIG. 1). The vibration device includes a vibration table 10, a vibration exciter 20, a connecting member 30, a mass 40, an air spring 50 that is an elastic body, and a gantry 60.

  The shaking table 10 can mount a specimen that is a part to be mounted on an automobile, an aircraft, a building, or the like. The vibrator 20 includes a vibrator main body 24 and a vibration shaft 25 that protrudes from the vibrator main body 24 and reciprocates horizontally on an axis. The shaker 20 can reciprocate the excitation shaft 25 at a set frequency and amplitude. That is, the vibration device includes a control device that controls the drive of the shaker 20, and can drive the shaker 20 in response to vibrations required for the vibration table 10. The vibration exciter 20 is substantially the same height as the vibration table 10 and is disposed in a substantially horizontal posture at a position facing one side surface 10A of the vibration table 10.

  The connecting member 30 has a rod shape. One end of the connecting member 30 is connected to the tip of the vibration shaft 25 via a static pressure ball joint 31, and the other end is connected to one side surface 10 </ b> A of the vibration table 10 via the static pressure ball joint 31. Yes.

  The vibrator 20 is placed on the upper surface of the mass 40 and fixed. The mass 40 is an iron ingot and has a rectangular parallelepiped shape. The mass 40 is formed such that the total mass of the mass of the vibration exciter 20 is larger than the total mass of the vibration table 10 and the specimen. For example, when the mass of the vibration table 10 is 650 kg and the mass of the specimen placed on the vibration table 10 is assumed to be 200 kg, the total mass of the shaker 20 and the mass object 40 is 2550 kg or more, preferably 3400 kg or more. The mass (size) of the mass object 40 is determined so that

  The gantry 60 includes a gantry main body portion 61 whose upper surface forms a horizontal plane, and a pair of wall portions 62 erected facing the upper surfaces of both end portions of the gantry main body portion 61. The gantry 60 lays a rail 63 extending between the wall portions 62 in the direction in which the vibration shaft 25 of the vibration exciter 20 reciprocates (left and right in FIG. 1). The mass 40 is movably mounted on the rail 63. Moreover, the air spring 50 is clamped between the mass 40 and both wall parts 62, respectively.

  The gantry 60 is fixed on a floating base 70 which is an installation floor. The floating foundation 70 is constituted by a floor member 71 and a plurality of floor air springs 72 arranged on the lower surface of the floor member 71, and is provided on the building frame. Thus, the mass 40 is held by the gantry 60 fixed to the floating foundation 70 by the air spring 50, and the horizontal direction is the direction in which the vibration shaft 25 of the vibration exciter 20 reciprocates on the rail 63. It can be moved freely. The air spring 50 plays a role of urging the mass object 40 to the origin position, and plays a role of making the influence of the reciprocating motion of the mass object 40 less likely to be exerted on both wall portions 60.

  In the vibration device having such a configuration, the total mass of the vibrator 20 and the mass 40 is larger than the total mass of the vibration table 10 and the specimen. For this reason, the resonance frequency depends solely on the mass of the mass 40, and more specifically, is determined in consideration of the spring force of the air spring 50. Therefore, this vibration device can set the resonance frequency in a range lower than the operating frequency band by increasing the mass of the mass object 40, and can eliminate the influence of resonance in the operating frequency band.

  Further, in this vibration device, since the total mass of the vibration exciter 20 and the mass object 40 is larger than the total mass of the vibration table 10 and the specimen, the movement amount of the mass object 40 is small and the movement speed is slow. . For this reason, this vibration device is easy to predict the moving amount and moving speed of the mass 40 caused by the reaction of the reciprocating motion of the excitation shaft 25. Therefore, this vibration device can apply the desired vibration to the vibration table 10 by controlling the reciprocating motion of the excitation shaft 25 based on the prediction.

  Further, in this vibration device, the vibration exciter 20 is disposed at substantially the same height as the vibration table 10, and the vibration shaft 25 reciprocates in the same horizontal direction as the vibration applied to the vibration table 10. The force generated by 20 and the amount of displacement of the excitation shaft 25 can be efficiently transmitted to the vibration table 10. For this reason, this vibration device can make the performance of the vibration exciter 20 the minimum necessary. As a result, this vibration device can also minimize the hydraulic pressure source for driving the vibration exciter 20. Therefore, this vibration device can reduce manufacturing costs and operating costs (power consumption).

  Therefore, the vibration device according to the first embodiment has a wide operating frequency, and can vibrate well even if the specimen placed on the vibration table 10 is heavy, and the manufacturing cost and the operation cost are reduced. be able to.

  Moreover, although this vibration apparatus is a specification which vibrates the vibration table 10 only in a horizontal direction, the case where it changes to the specification which vibrates the vibration table 10 also in a vertical direction is assumed. In this case, what is necessary is just to ensure the space which installs the vibration exciter 20 which provides the vibration of a perpendicular direction under the vibration stand 10. Even in this case, since the installation position of the mass 40 is raised by the gantry 60, it is possible to prevent the mass 40 from becoming unnecessarily large. In addition, by changing the height of the gantry 60, the vibration device can easily change the height at which the vibrator 20 is disposed. Furthermore, this vibration device can vibrate up to the limit performance (for example, 100 to 200 Hz) of the vibrator 20.

<Example 2>
In the vibration device according to the second embodiment, as illustrated in FIG. 2, the vibration table 11 vibrates three-dimensionally. This vibration device includes a vibration table 11, first to third vibrators 21, 22, and 23, a connecting member 32, first and second masses 41 and 42, an air spring 51 that is an elastic body, and a gantry 64. I have.

  The shaking table 11 is generally a rectangular flat plate with four corners cut off in plan view, and can be used to mount a specimen that is a component to be mounted on an automobile, aircraft, building, or the like. The first shaker 21 applies vibration to the vibration table 11 in the horizontal X-axis direction. Two second vibrators 22 are provided and apply vibration to the vibration table 11 in the horizontal Y-axis direction. Three third vibrators are provided and apply vibration to the vibration table 11 in the vertical Z-axis direction.

  The first to third vibrators 21, 22, and 23 include a vibrator main body 24 and a vibration shaft 25 that protrudes from the vibrator main body 24 and reciprocates on an axis. Each of the vibrators 21, 22, and 23 can reciprocate the excitation shaft 25 at a set frequency and amplitude. That is, the vibration device is provided with a control device that controls the drive of each of the vibrators 21, 22, and 23, and each of the vibrators 21, 22, and 23 is corresponding to the vibration required for the vibration table 11. Each can be driven independently.

  As shown in FIGS. 2 and 3, the first shaker 21 is substantially the same height as the vibration table 11 and is opposed to one side surface 11 </ b> A of the vibration table 11 extending along the horizontal Y-axis direction. Are arranged in a substantially horizontal posture. The two second vibrators 22 are substantially the same height as the vibration table 11 and are arranged in a substantially horizontal posture in a position facing one side surface 11B of the vibration table 11 extending along the horizontal X-axis direction. Has been. Each excitation shaft 25 of the first shaker 21 and the second shaker 22 protrudes from each shaker body 24 in the opposite direction to the vibration table 11. The first vibrator 21 can reciprocate the vibration shaft 25 in the same horizontal X-axis direction as the direction in which vibration is applied to the vibration table 11. The second vibrator 22 can reciprocate the vibration shaft 25 in the same horizontal Y-axis direction as the direction in which vibration is applied to the vibration table 11.

  The first shaker 21 and the second shaker 22 are connected to the vibration table 11 via a connecting member 32. As shown in FIGS. 2 to 4, the connecting member 32 sandwiches the two flat plate members 33 disposed at both ends and the first shaker 21 or the second shaker 22, and the left and right ends of the flat plate member 33. It is formed from two rod-shaped members 34 that connect the parts. The rod-shaped member 34 of the connecting member 32 is disposed so as to extend from the flat plate member 33 on one end side to the vibration table 11 beyond the first shaker 21 or the second shaker 22. The rod-shaped member 34 is formed longer than the entire length of the first shaker 21 or the second shaker 22 when the excitation shaft 25 protrudes most from the shaker body 24.

  As shown in FIG. 4, the tip of the excitation shaft 25 of the first shaker 21 or the second shaker 22 is a flat plate member on one end side (the side far from the vibration table 11) via a static pressure ball joint 31. It is connected to the inner surface of 33. Further, the outer surface of the flat plate member 33 on the other end side is connected to the side surfaces 11 </ b> A and 11 </ b> B of the vibration table 11 via the static pressure ball joint 31. As described above, the first shaker 21 and the second shaker 22 are connected to the vibration table 11 via the connecting member 32. For this reason, by reciprocating the excitation shaft 25, it is possible to apply a composite vibration in the horizontal X-axis direction and the horizontal Y-axis direction to the vibration table 11.

  As shown in FIGS. 2 and 3, the first mass 41 is arranged along one side surface 11 </ b> A that extends in the horizontal Y-axis direction of the vibration table 11. The first vibrator 21 is placed on the upper surface of the first mass 41 and fixed. Further, the second mass 42 is disposed along one side surface 11 </ b> B extending in the horizontal X-axis direction in the vibration table 11. The two second vibrators 22 are placed side by side on the upper surface of the second mass 42 and fixed.

  Each of the mass objects 41 and 42 is an iron ingot and has a rectangular parallelepiped shape that is long in the direction along the side surfaces 11A and 11B of the vibration table 11. The first mass 41 is formed such that the total mass of the masses of the first shaker 21 is larger than the total mass of the vibration table 11 and the specimen. The second mass 42 is formed so that the total mass of the masses of the two second vibrators 22 is larger than the total mass of the vibration table 11 and the specimen. For example, when the mass of the vibration table 11 is 650 kg and the mass of the specimen placed on the vibration table 11 is assumed to be 200 kg, each of the mass objects 41 and 42 and each of the mass objects 41 and 42 mounted thereon and fixed. The mass (size) of each mass is determined so that the total mass with the vibrators 21 and 22 is 2550 kg or more, preferably 3400 kg or more.

  Each of the masses 41 and 42 has a connecting portion 43 that protrudes outward on both side surfaces in the direction along the side surfaces 11A and 11B of the vibration table 11. The connecting portion 43 is connected to a connecting piece 44 that forms a vertical plane perpendicular to the direction in which the excitation shaft 25 of each of the vibrators 21 and 22 is placed and fixed on the upper surfaces of the mass objects 41 and 42 and reciprocates. It has a reinforcing piece 45 that is integrally formed on the top and bottom of the piece 44 and forms a triangular horizontal plane that narrows outward.

  As shown in FIG. 2 to FIG. 4, two gantry 64 are provided, and the first mass 41 or the second mass 42 is placed separately. Each pedestal 64 is placed so as to bridge between two leg portions 66 made of H steel arranged in parallel at a predetermined interval and the upper surface of the leg portion 66, and the upper surface forms a horizontal plane, And a rectangular top plate portion 65. In addition, each base 64 has three rails 67 laid on the top surface of the top plate portion 65. These rails 67 extend in a direction in which the excitation shaft 25 of the first shaker 21 or the second shaker 22 reciprocates. The first mass 41 and the second mass 42 are movably mounted on the rails 67.

  Each pedestal 64 has a pair of wall portions 68 erected on each upper surface on the short side of the top plate portion 65. The pair of wall portions 68 include a vertically-long rectangular facing wall portion 68A and side wall portions 68B that are continuously provided on both sides of the facing wall portion. The opposing wall portion 68 </ b> A of the pair of wall portions 68 is formed by the first shaker 21 or the second shaker 22 fixed to the first mass object 41 or the second mass object 42 placed on the top plate 65. The excitation shaft 25 is opposed to the direction orthogonal to the reciprocating motion.

  68 A of opposing wall parts of a pair of wall part 68 have inserted the connection part 43 of the 1st mass thing 41 or the 2nd mass thing 42 between them. The pair of wall portions 68 sandwich the air spring 51 between each opposing wall portion 68 </ b> A and the connecting piece 44 of the connecting portion 43.

  The gantry 64 is fixed on a floating foundation 73 which is an installation floor. The floating foundation 73 is configured by a floor member 74 and a plurality of floor air springs 75 disposed on the lower surface of the floor member 74, and is provided on the building frame. As described above, the first mass 41 and the second mass 42 are held by the gantry 64 fixed to the floating foundation 73 by the air spring 51, and the first vibrator 21 or the second vibration on the rail 67. The excitation shaft 25 of the machine 22 is movable in the horizontal X-axis direction or the horizontal Y-axis direction, which is the direction in which the reciprocating motion is performed. The air spring 51 plays a role of biasing the first mass 41 or the second mass 42 to the origin position, and the reciprocation of the first mass 41 or the second mass 42 with respect to the pair of wall portions 68. It plays a role of making it difficult for the influence of exercise to reach.

  Further, as shown in FIG. 2, three third vibrators 23 are provided, and are respectively disposed below the vibration table 11 and at positions corresponding to the tops of equilateral triangles in plan view. . The third shaker 23 projects each excitation shaft 25 from each excitation basic body 24 toward the vibration table 11 (vertically upward). The third vibrator 23 can reciprocate the vibration shaft 25 in the same vertical Z-axis direction as the direction in which vibration is applied to the vibration table 11.

  The third shaker 23 connects the lower end surface of the shaker body 24 to the upper surface of the floating foundation 73 via the static pressure ball joint 31. The third shaker 23 connects the tip of the vibration shaft 25 to the lower surface of the vibration table 11 via a static pressure ball joint 31. For this reason, the vibration in the vertical Z-axis direction can be applied to the vibration table 11 by reciprocating the excitation shaft 25 of the third shaker 23.

  In the vibration device having such a configuration, each of the total mass of the first shaker 21 and the first mass object 41 and the total mass of the second shaker 22 and the second mass object 42 is the vibration table 11. And the total mass of the specimen. For this reason, the resonance frequency with respect to the vibration in the horizontal X-axis direction and the horizontal Y-axis direction depends exclusively on the masses of the first mass 41 and the second mass 42, and more specifically, the spring force of the air spring 51 is taken into account. Determined. Therefore, this vibration device can set the resonance frequency to a range lower than the operating frequency band by increasing the masses of the first mass 41 and the second mass 42, and the influence of resonance in the operating frequency band. Can be eliminated.

  Further, in this vibration device, the total mass of the first shaker 21 and the first mass 41 and the total mass of the second shaker 22 and the second mass 42 are each provided with the vibration table 11. Since it is larger than the total mass with the specimen, the movement amount of the first mass object 41 and the second mass object 42 is small, and the movement speed becomes slow. For this reason, this vibration device can easily predict the moving amount and moving speed of the first mass object 41 and the second mass object 42 caused by the reaction of the reciprocating motion of the excitation shaft 25. Therefore, this vibration device can control the reciprocating motion of the excitation shaft 25 based on the prediction, and can impart the desired vibration to the vibration table 11.

  Further, in this vibration device, the first shaker 21 and the second shaker 22 are arranged at substantially the same height as the vibration table 11, and the same horizontal X-axis direction or horizontal Y as the vibration applied to the vibration table 11. Since the vibration shaft 25 reciprocates in the axial direction, the force generated by the first vibration device 21 and the second vibration device 22 and the amount of displacement of the vibration shaft 25 can be efficiently transmitted to the vibration table 11. . For this reason, this vibration apparatus can make the performance of the 1st shaker 21 and the 2nd shaker 22 the required minimum. As a result, this vibration device can also minimize the hydraulic power source for driving the first vibrator 21 and the second vibrator 22. Therefore, this vibration device can reduce manufacturing costs and operating costs (power consumption).

  Therefore, the vibration device of Example 2 also has a wide operating frequency and can be vibrated well even if the specimen placed on the vibration table 11 is heavy, and the manufacturing cost and operation cost can be reduced. be able to.

  In addition, compared with a structure in which the vibration shafts 25 of the first vibrator 21 and the second vibrator 22 protrude toward the vibration table 11 and are directly connected to the vibration table 11, the vibration device includes The vibration shafts 25 of the vibration exciter 21 and the second vibration exciter 22 protrude in the opposite direction with respect to the vibration table 11, and are connected to the vibration table 11 by a connecting member 32. For this reason, this vibration apparatus can vibrate the vibration table 11 in a wide range in the vertical Z-axis direction. The above also means that the distance between the first shaker 21 or the second shaker 22 and the vibration table 11 can be reduced, and the installation area of the vibration device can be reduced, thereby saving space. Can be achieved.

  Moreover, since this vibration apparatus has raised the installation position of the masses 41 and 42 with the mount frame 64, the situation where the masses 41 and 42 become larger than necessary is prevented. In addition, by changing the height of the gantry 64, the vibration device can easily change the height at which the first vibrator 21 and the second vibrator 22 are arranged. Furthermore, this vibration apparatus can vibrate up to the limit performance (for example, 100 to 200 Hz) of the first vibrator 21 and the second vibrator 22.

The present invention is not limited to the first and second embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first and second embodiments, the vibration exciter is arranged at substantially the same height as the vibration table, but the vibration generator may not be arranged at the same height as the vibration table. In this case, an extension piece extending in the vertical direction from the side surface of the vibration table may be provided, and the other end of the connecting member may be connected to the extension piece.
(2) In Examples 1 and 2, the vibration device was provided with a gantry on which a mass was placed. It may be placed.
(3) In the first and second embodiments, the mass is movably mounted using the rail, but the mass may be movable with another structure.
(4) In the first and second embodiments, the mass is movably held by the air spring. However, the mass may be movably held by another elastic body.
(5) The elastic body that holds the mass may be other than the forms shown in the first and second embodiments, such as being arranged below the mass.
(6) The connecting member may have a form other than that shown in the first and second embodiments.
(7) In Examples 1 and 2, although the floating foundation which is an installation floor is provided, the vibration device may be directly installed on the building frame without using the floating foundation.
(8) In Example 2, the masses of the first mass and the second mass may be the same or different.

DESCRIPTION OF SYMBOLS 10, 11 ... Shaking table 20, 21, 22, 23 ... Vibrator (21 ... 1st shaker, 22 ... 2nd shaker, 23 ... 3rd shaker)
24 ... Exciter body 25 ... Excitation shaft 70, 73 ... Floating foundation (installed floor)
40, 41, 42 ... mass (41 ... first mass, 42 ... second mass)
50, 51 ... Air spring (elastic body)
60, 64 ... frame 30, 32 ... connecting member

Claims (3)

A shaking table on which the specimen is placed;
The vibration device includes a vibrator main body and a vibration shaft that protrudes from the vibrator main body and reciprocates on an axis and applies a horizontal vibration to the vibration table. And
The exciter is fixed so that the excitation shaft reciprocates in the horizontal direction , and a mass is disposed on the installation floor so as to be movable in the horizontal direction in which the excitation shaft reciprocates.
An elastic body that movably holds the mass in a direction in which the excitation shaft reciprocates with respect to the installation floor,
The total mass of the said shaker and the said mass thing is larger than the mass of the said vibration stand, The vibration apparatus characterized by the above-mentioned. Comprising a gantry fixed on the installation floor;
The vibration device according to claim 1, wherein the mass is placed on the frame and held by the elastic body. The excitation shaft protrudes from the shaker body in the opposite direction to the shaking table,
The one end side is connected to the tip of the excitation shaft, and extends from the one end side toward the vibration table, and the other end side includes a connecting member connected to the vibration table. 2. The vibration device according to 2.

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