JP4155354B2 - Multi-axis vibration test equipment - Google Patents

Description

  The present invention relates to a multi-axis vibration test apparatus used for vibration tests of various structures and the like.

  FIG. 16 shows a conventional multi-axis vibration test apparatus of this type. This vibration test apparatus 81 includes a hydrostatic bearing type vibration generator 83 having a vibration table 82 on a substantially central upper surface, and an inside of the vibration generator 83. In the case of performing various types of hydraulic control, a cooling blower 85 for cooling the vibration generator 83, and a power amplifier 86 for supplying power to the vibration generator 83, the hydraulic source 84 and the cooling blower 85. It consists of and. Further, since the conventional vibration test apparatus 81 is configured by individually arranging the vibration generator 83, the hydraulic source 84, the cooling blower 85, and the power amplifier 86, the power amplifier 86 vibrates with the power cable 87. The generator 83, the cooling blower 85, and the hydraulic pressure source 84 are connected. The hydraulic source 84 and the vibration generator 83 are connected by a hydraulic hose 88, and the cooling blower 85 and the vibration generator 83 are connected by a duct hose 89.

  The vibration generator 83 is, as is well known, a horizontal vibration generator composed of a pair of horizontal vibration generators that generate vibration in the X direction on a horizontal plane, and a pair that generates vibrations in the Y direction perpendicular to the X direction. A horizontal vibration generating unit comprising a horizontal vibration generator and a vertical vibration generating unit for generating vibration in the vertical direction of the Z direction are provided. A vibration test is performed in such a manner that three-axis vibration can be applied to the test object placed on the vibration table 82 in the three axes of the X, Y, and Z directions.

In order to increase the vibration capacity of the vibration table 82, horizontal vibration generators in the X direction (horizontal vibration generators in the Y direction) are arranged on both sides of the vibration table 82, respectively. Examples of such an arrangement include the conventional example shown in FIG. 16 and, for example, Patent Document 1.
Japanese Patent No. 3152411

  When a pair of horizontal vibration generators are installed in each of the X and Y directions, a double vibration force is generated compared to the case where one horizontal vibration generator is installed. Therefore, it is necessary to double the ability accordingly. Therefore, conventionally, only one vertical vibration generating unit is arranged, and the design is performed so that the excitation force of the vertical vibration generating unit is doubled. That is, a vertical vibration generating unit having a capacity twice that of a horizontal vibration generator in the X direction or the Y direction is provided.

  Therefore, the horizontal vibration generating unit in the X direction and the Y direction and the vertical vibration generating unit in the Z direction are separately designed, which increases the cost, and for maintenance management, a pair of X direction and Y direction. It is necessary to store two types of vibration generators, a horizontal vibration generator composed of horizontal vibration generators and one vertical vibration generator in the Z direction, which is troublesome in terms of maintenance such as parts replacement. was there.

  The present invention has been made in order to solve the above-mentioned conventional drawbacks, and its purpose is to unitize horizontal and vertical vibration generators as the same structure to facilitate cost reduction and maintenance. It is an object of the present invention to provide a multi-axis vibration test apparatus capable of satisfying the requirements.

  Therefore, in the multi-axis vibration test apparatus according to claim 1, a vibration table for performing a vibration test by placing an object to be tested, and a pair of horizontal vibrations disposed on both sides of the vibration table for exciting the vibration table in a horizontal direction. In a multi-axis vibration test apparatus including a generator and a vertical vibration generating unit that vibrates the shaking table in a vertical direction, the vertical vibration generating unit includes a pair of vertical vibration generators, and the vertical vibrations It is characterized in that the generators are connected in the vertical direction opposite to each other.

  The multi-axis vibration testing apparatus according to claim 2 is characterized in that the configuration of the vertical vibration generator is substantially the same as that of the horizontal vibration generator.

  According to the multi-axis vibration test apparatus of the first aspect, since the pair of vertical vibration generators are connected in the vertical direction opposite to each other, the magnetic flux generated by the magnetic circuit generated in the drive coils of the vertical vibration generators These directions are opposite to each other, and two independent magnetic circuits by the upper and lower vertical vibration generators have a combination of excitation forces in series. Therefore, twice the excitation force can be generated, and the same excitation force as that of the horizontal vibration generator can be obtained.

  According to the multi-axis vibration testing apparatus of claim 2, the configuration of the vertical vibration generator is substantially the same as that of the horizontal vibration generator, so that the vertical vibration generator can be designed to be substantially the same as the horizontal vibration generator. As a result, the vibration generator can be unitized to reduce costs and facilitate maintenance.

  Next, specific embodiments of the multi-axis vibration test apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an external appearance of a hydrostatic bearing type vibration test apparatus 1, and FIG. 2 is a cross-sectional view in which an internal mechanism is omitted. This vibration test apparatus 1 is an electrodynamic vibration test apparatus in which components are integrally mounted and disposed in a base 2 and a casing 3 constituting an outer shell. The table 4a of the vibration table 4 for performing a vibration test is placed, and an operation panel section 5 for operation for setting each vibration condition and performing the test is provided in the upper part of the front.

  As shown in FIGS. 2 and 3, four support columns 6 are erected on the upper surface of the base 2, and a support frame 10 is disposed on the upper surface of the support column 6 via a vibration isolation mechanism 7. Support pieces 11 bent at four positions of the support frame 10 are arranged on the vibration isolation mechanism 7, and the support frame 10 is arranged in a floating state with respect to the base 2. In addition, concave arrangement portions 12 and 13 for arranging vibration generators that vibrate in the X direction and the Y direction are provided on the front, rear, left, and right sides of the support frame 10. A pair of horizontal vibration generators 21a and 21b that perform vibration in the X direction are arranged as shown in FIGS. 4, 5, and 8, respectively. Further, the horizontal vibration generators 22 including a pair of horizontal vibration generators 22a and 22b that perform vibration in the Y direction are arranged in the arrangement parts 13 before and after the support frame 10, respectively. Further, a vertical vibration generator 23 composed of two vertical vibration generators 23 a and 23 b that vibrate in the Z direction is disposed in a cavity formed in the center of the support frame 10. A substantially triangular plate-like bracket 14 is provided on the lower surface of the placement portions 12 and 13 to support the weight of the horizontal vibration generating portions 21 and 22 in the X and Y directions.

  Here, the horizontal vibration generators 21 and 22 are each composed of a pair of horizontal vibration generators 21a, 21b, 22a and 22b, and two units are arranged on the front, rear, left and right, respectively. Is also arranged in series in the vertical direction with two vertical vibration generators 23a and 23b. The two horizontal vibration generators 21a and 21b on the left and right sides, the two horizontal vibration generators 22a and 22b on the front and rear sides, and the two vertical vibration generators 23a and 23b on the upper and lower sides are designed to have the same structure. That is, unitization is achieved using the same vibration generating unit.

  The vibration table 4 is disposed on the upper surface of the vertical vibration generating unit 23 between the horizontal vibration generating unit 21 in the X direction and the horizontal vibration generating unit 22 in the Y direction. The vibration table 4 is vibrated in the X direction by the horizontal vibration generator 21, the vibration table 4 is vibrated in the Y direction by the other horizontal vibration generator 22, and the vibration table 4 is moved in the Z direction by the vertical vibration generator 23. Excited. Of course, the vibration table 4 is vibrated only in the X direction, only in the Y direction, only in the Z direction, or any two-dimensional or three-dimensional.

  Next, one horizontal vibration generator 21a of the horizontal vibration generator 21 in the X direction shown in FIG. 5 will be described. The other horizontal vibration generator 21a and a pair of horizontal vibrations of the horizontal vibration generator 22 in the Y direction are described. Since the generators 22a and 22b have the same configuration, the description of the horizontal vibration generator 22 in the Y direction is omitted. As shown in FIG. 5 and FIG. 6 showing an enlarged cross-sectional view of the main part of the horizontal vibration generator 21a, a substantially circumferential groove is formed inside the outer cylindrical body 26 constituting the outer shell of the horizontal vibration generator 21a. 27, an inner cylinder portion 28 is provided, and a permanent magnet 25 is disposed on the inner peripheral surface on the distal end side of the outer cylinder body 26. In addition, a circumferential side portion 41 of a movable body 40 having a substantially U-shaped cross section for vibrating the vibration table 4 is loosely fitted in the groove 27 so as to freely reciprocate. A drive coil 29 is wound around the outer peripheral surface of 41. A bearing portion 30 is provided at the center portion of the inner cylinder body 28. An outer cylinder 31 of the bearing portion 30 is fixed to an inner peripheral surface of the inner cylinder body 28, and a shaft 32 which is a shaft of the bearing section 30 has a ball. It is slidable in the axial direction. The tip of the shaft 32 is connected and fixed to the central portion of the inner surface of the movable body 40, and the peripheral side portion 41 of the movable body 40 is slidably inserted into the groove 27.

  An alternating current as a control signal having an arbitrary frequency is supplied to the drive coil 29 of the horizontal vibration generator 21a to generate a magnetic circuit and reciprocate the movable body 40 at a predetermined frequency by the magnetic force generated by the magnetic flux. It is like that. By changing the directions of the magnetic fluxes of the left and right horizontal vibration generators 21a and 21b, the movable bodies 40 are driven in the same direction, whereby the vibration table 4 is reciprocated at a predetermined frequency. Further, bearings 43 are provided on the sides of the vibration table 4, respectively, and oil is circulated from the hydraulic source 53 to be described later to the bearings 43, thereby generating horizontal vibration generators 21 a and 21 b ( The Y-direction horizontal vibration generators 22a and 22b) have an oil sliding surface that slides with an oil film of oil on the front end surface of the movable body 40. As a result, the vibration table 4 and the movable body 40 of the horizontal vibration generators 21 and 22 are in smooth and slidable contact with each other, and can also be slid in the vertical direction by the vertical vibration generator 23. Are in contact.

  Next, the configuration of the two vertical vibration generators 23a and 23b constituting the vertical vibration generator 23 is also the same as that of the horizontal vibration generator 21a described above. explain. As shown in FIG. 5, the upper vertical vibration generator 23a is disposed with the movable body 40 facing up, and the lower vertical vibration generator 23b is disposed with the movable body 40 facing down. The movable body 40 of the lower vertical vibration generator 23b is placed on an air spring 45 provided on the bottom 44 of the support frame 10. Further, the shafts 32a of the bearing portions 30 and 30 of the upper and lower vertical vibration generators 23a and 23b are formed to be long, and the upper and lower bearing portions 30 are connected to each other. This is a shaft as the vertical vibration generator 23 composed of the vertical vibration generators 23a and 23b. The upper end of the shaft 32a is connected and fixed to the movable body 40 of the upper vertical vibration generator 23a, and the lower end of the shaft 32a is connected and fixed to the movable body 40 of the lower vertical vibration generator 23b.

  The vertical vibration generator 23 is fixed on the step 46 of the support frame 10 via a support 47, and a partition plate 48 is provided between the upper and lower vertical vibration generators 23a and 23b as shown in FIG. Is intervening. In the partition plate 48, a portion corresponding to the outer cylindrical body 26 and the inner cylindrical portion 28 is configured by a magnetic body portion 48 a, a portion corresponding to the groove 27 is configured by a nonmagnetic body portion 48 b, and the nonmagnetic body portion. A hole 49 communicating with the upper and lower grooves 27 is formed in 48b. It is to be noted that the drive coils 29 are prevented from interfering with each other by the non-magnetic body portion 48 b of the partition plate 48, and the oil film forming oil used in the bearing 43 is allowed to flow through the groove 27 and the hole 49. Thus, the drive coil 29 is cooled. The upper and lower portions of the upper and lower grooves 27 are opened, that is, the upper and lower portions of the groove 27 penetrate the outside.

  Further, since the upper and lower vertical vibration generators 23a and 23b are arranged in opposite directions, the directions of magnetic fluxes generated by the magnetic circuits in the drive coils 29 of the upper and lower vertical vibration generators 23a and 23b are opposite to each other. The two independent magnetic circuits by the upper and lower vertical vibration generators 23a and 23b are combined in series. Therefore, when the two vertical vibration generators 23a and 23b are driven at a predetermined frequency, the upper and lower movable bodies 40 are driven in the same direction to reciprocate. Accordingly, two independent magnetic circuits by the upper and lower vertical vibration generators 23a and 23b are combined in series, and the two vertical vibration generators 23a and 23b are compared with the single vertical vibration generator 23a (23b). Thus, it is possible to generate a double excitation force. Accordingly, the two vertical vibration generators 23a and 23b can generate the same excitation force as the horizontal vibration generators 21 and 22 provided at the front, rear, left and right, respectively, and can vibrate the vibration table 4.

  The vertical vibration generators 23a and 23b in the upper and lower units are the same except for the configuration of the horizontal vibration generators 21a, 21b, 22a, and 22b of the horizontal vibration generators 21 and 22 except for the portion of the shaft 32a. Therefore, the same design can be made as the individual vibration generator, so that the vibration generator can be unitized, and cost reduction and maintenance can be facilitated.

  As described above, the front, rear, left and right horizontal vibration generators 21 and 22 are disposed on the upper surface of the support frame 10, and the vertical vibration generator 23 is disposed inside the support frame 10. And each member (unit) which comprises the vibration test apparatus 1 using the empty space of the space around the support frame 10 is arrange | positioned as shown below.

  8 to 14 show the internal structure of the vibration test apparatus 1 with the casing 3 omitted. FIG. 8 is a plan view of the vibration test apparatus 1, FIG. 9 is a front view, FIG. 10 is a rear view, and FIG. 11 shows a right side view, and FIG. 12 shows a left side view. 13 shows a perspective view of the vibration test apparatus 1 from the front, and FIG. 14 shows a perspective view from the back. 8 to 14, a power supply unit 51 for supplying power to the entire apparatus is disposed on the front right side of the base 2 of the vibration test apparatus 1, and the power supply unit 51 from the power supply unit 51 is disposed on the rear right side of the base 2. A plurality of power modules 52 that receive power supply and send electric power (control AC signal) to the horizontal vibration generators 21 and 22 and the vertical vibration generator 23 are arranged. In addition, a hydraulic pressure source 53 that is an oil supply source for hydraulic control is disposed on the left side of the rear portion of the base 2, and a cooling blower 54 for cooling the entire apparatus is disposed in the center of the rear portion of the base 2. ing. Further, on the left side of the base 2, a main body portion 55 is disposed that includes a control circuit that constitutes a controller with the operation panel portion 5.

  FIG. 15 shows a view of cooling the drive coils 29 of the horizontal vibration generating units 21 and 22 and the vertical vibration generating unit 23, and a cooling fan 58 is provided on the outer surface of the horizontal vibration generating units 21 and 22. Yes. The fan 58 is provided in a place communicating with the air passage 59, and the air passage 59 and the groove 27 in which the drive coils 29 of the horizontal vibration generating portions 21 and 22 are disposed communicate with each other to rotate the fan 58. By driving, the drive coil 29 is cooled via the air passage 59 and the groove 27.

  On the other hand, in the vertical vibration generating unit 23, a fan is conventionally provided for cooling as in the case of the horizontal vibration generating units 21 and 22. However, in the present invention, the vibration is not provided separately. The oil used for the sliding surface of the bearing 43 of the base 4 is used to cool the drive coil 29 of the vertical vibration generating unit 23. That is, as shown in FIG. 15, the oil flowing through the bearing 43 of the vibration table 4 slowly flows down along the surface and the inside of the bearing 43, and the excess oil is shown by the arrows in the figure. In addition, it flows from the bearing 43 to the lower surface of the vibration table 4 and further flows down into the movable body 40 or directly into the groove 27 of the vertical vibration generator 23. Since the grooves 27 of the upper and lower vertical vibration generating portions 23 communicate with each other, the oil flows down into the grooves 27, and further, the oil contacts and cools the drive coils 29 disposed above and below the grooves 27. run down. The oil that has flowed down from the lower end of the groove 27 of the vertical vibration generator 23 is recovered to the hydraulic power source 53 through the hole 60 in the bottom 44 of the support frame 10. The oil recovered by the hydraulic power source 53 is circulated and supplied again to the bearing 43 of the vibration table 4. A guide member 61 for guiding the oil to the vertical vibration generating unit 23 side is provided below the bearing 43 of the vibration table 4 so that the oil does not diffuse around.

  As described above, since oil is transmitted to the place where heat is generated by the drive coil 29 of the vertical vibration generating unit 23 and cooled, the fan is unnecessary and the cost can be reduced as in the conventional case. Of course, the heat generation amount of the drive coil 29 is designed so that the heat generation of the drive coil 29 is possible by oil cooling.

  Further, the horizontal vibration generating units 21 and 22 and the vertical vibration generating unit 23 other than heat generation other than the heat generation of the horizontal vibration generating units 21 and 22 and the vertical vibration generating unit 23, the power supply unit 51, the power module 52, and the hydraulic pressure are generated. The source 53, the control main body 55, and the like are cooled by a single cooling blower 54. That is, since each component is covered with the casing 3, the cooling can be performed by only one cooling blower 54.

It is a perspective view of the appearance of a vibration test device in an embodiment of the present invention. It is sectional drawing which abbreviate | omitted the internal mechanism in embodiment of this invention. It is a perspective view of the support frame in embodiment of this invention. It is a front view of the state which mounted the horizontal vibration generating part in the support frame in embodiment of this invention. It is sectional drawing of the state which mounted the horizontal vibration generation part and the vertical vibration generation part in the support frame in embodiment of this invention. It is a principal part expanded sectional view of the horizontal vibration generator in embodiment of this invention. It is a principal part expanded sectional view of the vertical vibration generation | occurrence | production part in embodiment of this invention. It is a top view which shows the internal structure of the vibration testing apparatus in embodiment of this invention. It is a front view which shows the internal structure of the vibration test apparatus in embodiment of this invention. It is a rear view which shows the internal structure of the vibration test apparatus in embodiment of this invention. It is a right view which shows the internal structure of the vibration test apparatus in embodiment of this invention. It is a left view which shows the internal structure of the vibration test apparatus in embodiment of this invention. It is the perspective view seen from the front which shows the internal structure of the vibration testing apparatus in embodiment of this invention. It is the perspective view seen from the back which shows the internal structure of the vibration testing apparatus in embodiment of this invention. It is explanatory drawing in the case of cooling the drive coil of the vertical vibration generation part in embodiment of this invention with oil. It is a block diagram of the vibration test apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration test apparatus 4 Shaking table 21 Horizontal vibration generator 21a, 21b Horizontal vibration generator 22 Horizontal vibration generator 22a, 22b Horizontal vibration generator 23 Vertical vibration generator 23a, 23b Vertical vibration generator

Claims (2)

A vibration table (4) on which a vibration test is carried by placing the object to be tested, and a pair of horizontal vibration generators (21a) arranged on both sides of the vibration table (4) to vibrate the vibration table (4) in the horizontal direction. ) (21b), and a multi-axis vibration testing apparatus including a vertical vibration generating unit that vibrates the vibration table (4) in the vertical direction.
The vertical vibration generator is composed of a pair of vertical vibration generators (23a) and (23b), and the vertical vibration generators (23a) and (23b) are connected in the vertical direction opposite to each other. Multi-axis vibration test equipment.   The multi-axis vibration test apparatus according to claim 1, wherein the vertical vibration generators (23a) and (23b) have substantially the same structure as the horizontal vibration generators (21a) and (21b).