TWI308610B - Controllable seismic isolation system - Google Patents

Description

[Technical Field] The present invention relates to a controllable vibration isolation system, and more particularly to a shock absorption system capable of controlling both the isolation frequency and the isolation stiffness. The system can be adapted to different seismic waves. The characteristics are appropriately adjusted, in addition to avoiding the resonance phenomenon between the isolation frequency and the seismic wave main shock frequency, and the innovative designer of the controllable isolation system that can increase the damping performance. BACKGROUND OF THE INVENTION According to the earthquake, the damage to the civil structure is mainly caused by the intense surface movement transmitted to the upper structure through the foundation of the structure. The so-called isolation technology is to place a special isolation support between the upper structure and the foundation. The overall vibration period of the long structure can slow down the surface motion and upload it to the structure, reducing the seismic force of the superstructure and thus improving its seismic resistance. The aforementioned conventional isolation technology has been applied to civil structural systems for decades. It has proven to be very effective against general far-field seismic waves. For near-fault seismic waves with different solutions: 3⁄4, the damping effect is not good. The research shows that the traditional sliding support under the near-fault seismic wave is much larger than the far-field seismic wave, and the difference will increase with the increase of the horizontal peak acceleration (pGA). The main principle is the near-fault seismic wave (near-field seismic wave). In the long-period fast-production low-IS near-fault area, if only the traditional isolation is used alone; the reduction of the structure is not enough for the reduction, :: the supplementary energy element, the displacement of the support is not == liter, guide (4) The shock absorption effect will be greatly reduced, and the design of the upper isolation structure of the upper seismic structure of the upper seismic isolation system is usually between 2 and 3 " the isolation period falls within the pulse period 1308610 of the common near-fault seismic wave. Although it can achieve the ideal shock absorption effect for the short-period-like seismic wave, it is easy to resonate with the near-fault seismic wave with long-period characteristics. If the isolation is pure-recorded at the time of design, although the shock absorption effect may be improved in the near-fault seismic wave, the overall isolation stiffness tends to be soft, and the displacement of the isolation support is increased, so that the plane size of the support is too large. Unfavorable application. On the other hand, if the design is separated by a short period of time, the overall filament is hardened, and the acceleration of the superstructure is easily increased, and the shock absorption effect is not good. Therefore, it is difficult to balance the near- and far-field seismic waves with (4) seismic wave connotations. Among them, the domestic patent data search shows that the current technology for sliding isolators can be illustrated by the following examples: 1. As shown in Figure 23, the sliding vibration isolator of No. 55 is in contact with the bottom of the friction. The curved surface is a circular arc surface with a fixed radius of curvature. Therefore, the isolation period is constant and it is easy to resonate with a specific seismic wave. 2. As shown in Figure 24, Announcement No. 554124 is also a sliding isolation support with a double sliding surface, but the top and bottom surfaces of the articulated friction are both curved (4) arcuate faces, so they are separated = fixed value, easy to resonate with a specific seismic wave. 4 Hummer

3. As shown in Figure 25, No. 364032 is a two-way rolling isolation system consisting of upper and lower two-way isolation platforms. The upper layer is X-shock and the lower layer is y-direction isolated. Each layer is composed of four rollers: The shaft can be rolled in a preset arc groove for vibration isolation purposes. ^ The upper and lower curves of the groove can be pre-formed into arcs with non-fixed curvature. However, the isolation characteristics cannot be optimally adjusted with the characteristics of the seismic wave and the isolation system. 4. As shown in Figure 26, Announcement No. 466292 is also a two-way rolling isolation system with upper and upper 1308610 layers. The isolation layer consists of four rollers in a preset rolling groove. However, its isolation characteristics cannot be optimally adjusted with the characteristics of the seismic wave and the reaction of the isolation system itself. SUMMARY OF THE INVENTION The controllable vibration isolation system of the present invention mainly comprises: an isolation platform, a stiffness controllable mechanism and a positioning drive device; the isolation platform is used for arranging the isolated object and supporting the same The utility model can be used for carrying the weight of the upper object to be isolated, wherein the controllable mechanism comprises a lever arm, the central support point of the lever arm movable to the left and right and two connection points movable forward and backward, wherein one connection point can be borrowed The connecting rod is coupled with the seismic isolation platform. The other connecting point is connected with an elastic body to provide the isolation platform restoring force. The positioning driving device is used for instantly controlling the position of the central support point of the lever arm of the stiffness controllable mechanism. In order to change the length of the left and right of the product arm, thereby achieving the vibration isolation period and the stiffness of the isolation layer, the object can be optimally adjusted according to the reaction of the seismic wave and the isolation system itself. [Embodiment] First, the present invention mainly includes: an isolation platform (1), a stiffness controllable mechanism (2), and a positioning driving device (3); wherein: The isolation platform (1) is used to house the isolated object (4) (such as: general civil structures (such as buildings, bridges, etc.), general equipment, high-precision equipment or storage tanks, etc. 〕, the lower end surface of the isolation platform (1) is provided with a support (11) for carrying the weight of the upper isolated object (4), and the support (U) can be supported on the ground (5) 12) upper end movement; the stiffness controllable mechanism (2), comprising a telescopic lever arm (21) having a central support point (211) movable left and right, and movable forward and backward The connection 7 1308610 points (212), (213), and the central support point (211) and the connection points (212), (213) are respectively limited by the bundle paths (22), (23) and (24) Moving path, the moving path of the connecting points (212), (213) is perpendicular to the road of the central supporting point (2H), and one connecting point (212) can be separated by the connecting rod (25) The platform (1) is coupled, and the other connection point (213) is connected with an elastic body (26) (such as: spring, rubber, artificial composite, etc.) to provide a vibration isolation platform (丨) restoring force; the positioning driving device (3), which may be a servo motor and a lead screw set or a hydraulic actuating device 'for instantly controlling the position of the center support point (211) of the crossbar arm (21) of the stiffness controllable mechanism (2), To change the length of the lever arm (21). Please refer to the system usage configuration diagram shown in the third figure. At any time point, the sensor (61) located on the isolation platform (1), the isolated object (4) or the ground (5) will measure the isolation platform (1) and the isolated earthquake. The reaction of the object (4) is fed back to the controller (6) to determine the position of the central support point (211) at the lever arm (21), and then the positioning drive device (3) is controlled to move the center support point (211) Position 'This can instantly control the ratio of the left and right lengths of the lever arm (21), and can also control the isolation stiffness and isolation period of the isolation system. The support (11) of the isolation platform (1) of the present invention can not only roll the roller support (111) on the track path (121) (as shown in the fourth figure); but also can be a sliding support (112) [ Please refer to the figure in the fifth figure, and slide the sliding material (113) on the track path (121) to make it resistant to friction and low friction. The support (11) of the present invention can also roll the roller support ( ill) on an arcuate path (122) having an arbitrary curvature (such as a two-dimensional curved strip) (see the sixth figure), or The frictional support (114) slides on an arcuate path (122) having an arbitrary curvature (for example, a two-dimensional curved strip) (see the description of Fig. 1308610), or the support (U) is elastically supported. (U5) [eg rubber support; see the figure in the figure). When the support (11) of the seismic isolation platform (1) of the present invention is a roller support (111) (refer to the third, fourth, and sixth figures), 'the roller support (111) is fitted to the track path (121). ) or scrolling on an arcuate path (122) with arbitrary curvature so that it has both a beam path and a support effect; please refer to the sixth, seventh, and eighth diagrams as the 'isolated platform of the present invention (1) The support (11) is a roller bearing (111), and the arc-shaped friction bearing (114) is rolled, slid, or elastically supported (115) on an arcuate path (122) of arbitrary curvature, the support (11) ) itself has the isolation and recovery stiffness. In addition, please refer to the figure IX, the center support point (211) of the lever arm (21) of the stiffness controllable mechanism (2) of the present invention may be on the outer side; or as shown in the tenth figure, Two slots (27) are formed in the longitudinal center of the lever arm (21) of the control mechanism (2), so that any two points of the central support point (211) and the connection points (212) and (213) are free from the slot (27) Sliding in the middle. In addition, please refer to the second section - the figure shows that the upper and lower two-layer isolation platform (1) can be directly superposed to form a two-way isolation system, and the upper layer is y-isolated and the lower layer is X-isolated. The upper and lower layers of the stiffness controllable mechanism (2) are perpendicular to each other 'the weight of the isolated object (4) is transmitted from the upper layer (H) to the lower layer (11). The invention can also be the two-way isolation system shown in the twelfth figure, wherein the upper and lower layers each have a set of stiffness controllable mechanisms (2), and the two sets of stiffness controllable mechanisms (2) are arranged perpendicular to each other. The upper layer can be used to change the y-direction isolation stiffness, while the lower layer can be used to change the X-direction isolation stiffness' and the weight of the isolated object (4) is applied to the lower end of the upper isolation platform (1). The bidirectional support (13) is directly transmitted to the ground (5), and the bidirectional support (13) may be an elastic support (131) 9 1308610 [eg rubber support]; or as shown in Fig. 13, the bidirectional support (Μ) The ball support (132) may be rolled on the planar path (123); or as shown in Fig. 14, the bidirectional support (13) may be a ball support (132) on a curved path (124) [eg, three-dimensional The surface is scrolled; or as shown in Fig. 15, the bidirectional support (13) can slide the frictional support (133) on the planar path (123); or as shown in Fig. 16, the bidirectional support (13) The hemispherical friction bearing (134) can be slid over the curved path (124) (eg, a three-dimensional surface). Please refer to the seventeenth and eighteenth drawings, which are mathematical models of the first and second embodiments (fourth and fifth figures) of the present invention. If at a certain point in time, the lengths of the central support point (211) and the connection point (213) and the connection point (212) of the lever arm (21) are β(7) and wo, respectively, the isolation system is at the connection point (2^ 2) The feeling of stiffness is from

^(0

K〇 = ccitf k0

Where h is the connection point (the ratio of the length of the 213 point material (21). The isolation system at this time

Where [2]

[3] is the isolation platform (1) and the upper object

As can be seen from [2], the UJ cycle of the present invention can be changed by the degree of bar and vibration isolation. Please refer to the fourth (4). Figure 3 is a mathematical model of the fifth, fourth, and ten 1308610 five embodiments (shown in Figures 6, 7, and 8). The difference from the seventeenth and eighteenth figures is that the isolation platform (1) supports itself to provide additional isolation stiffness. At this time, the formulas [1] and [2] should be modified as k(t) = (a(t)2 + r)k0 T〇 m [4] [5]

Where r = is the dimensionless stiffness ratio. It can be seen from the formulas [4] and [5] that the isolation stiffness and the isolation period of the third, fourth or fifth embodiment of the present invention can still be controlled by changing the ratio of the lever arm (21). In the eleventh and twenty-second graphs, the seismic isolation support displacement and the superstructure acceleration of the present invention and the conventional sliding isolation support in the case of the near-fault seismic wave with the magnitude of seven (PGA=0.4g) are simulated by numerical methods. The chronograph diagram, wherein the friction coefficient of the support is taken as 0.03; the natural vibration frequency of the structure is 1.67 Hz; the isolation period of the conventional isolation support is 2.5 seconds. From the twenty-first, twenty As can be seen from the second figure, the present invention is superior to the conventional isolation support regardless of the comparison of the support displacement or the shock absorption effect of the superstructure acceleration. As described above, the present invention is based on the isolation period and the vibration of the isolation layer. The invention can be optimally adjusted according to the nature of the shock wave and the reaction of the isolation system itself, so that the problem of the conventional passive isolation system can be overcome, and when it is more practical, the present invention is further enhanced. The examples do achieve the desired efficacy The specific structure disclosed by it has not only been seen in similar products, nor has it been disclosed before the application. Cheng has fully complied with the requirements and requirements of the Patent Law, and has filed an application for invention patents according to law. 11 1308610 Quasi-patent, it is really sensible.

12 1308610 [Simplified description of the drawings] First: Schematic diagram of the structure of the present invention (front view) Second diagram: Schematic diagram of the controllable mechanism of the present invention (top view) Third: The configuration diagram of the system of the present invention (front FIG. 4 is a schematic view showing the structure of a first embodiment of the present invention (perspective view). FIG. 5 is a schematic view showing a structure of a second embodiment of the present invention (front view). FIG. Side view) Fig. 7 is a schematic view showing the structure of a fourth embodiment of the present invention (side view). FIG. 8 is a schematic view showing the structure of a fifth embodiment of the present invention (side view). FIG. 9 is a view showing a controllable mechanism of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 10 is another embodiment of the lever arm of the stiffness controllable mechanism of the present invention. FIG. 11 is a schematic view showing the structure of the sixth embodiment of the present invention. FIG. FIG. 13 is a schematic view showing the support of the eighth embodiment of the present invention. FIG. 14 is a view showing the support of the ninth embodiment of the present invention. FIG. Figure 16 is a view showing the support of the eleventh embodiment of the present invention. Figure 17 is a schematic view showing the mathematical model of the first and second embodiments of the present invention. (18) Eighteenth embodiment: First and second embodiments of the present invention Schematic diagram of mathematical model (2) Fig. 19: Schematic diagram of mathematical model of the third, fourth and fifth embodiments of the invention (1) Fig. 20: Schematic diagram of the mathematical model of the third, fourth and fifth embodiments of the invention (2) Figure 21: Comparison of support displacement duration response of the present invention Figure 13 1308610 Twenty-second diagram: Comparison of acceleration history response of the upper structure of the present invention Figure 23: Announcement No. 554123 Figure 24: Bulletin No. 554124, Figure 25: Announcement No. 364032, Figure 26: Bulletin No. 466292 [Main component symbol description] (1) Isolation platform (11) Support (111) roller support (112 Sliding bearing I (113) friction interface material (114) solitary friction bearing P (115) elastic bearing (12) bearing surface Γ (121) obstructing path (122) arc path (123) plane path (124) Curved path (13) bidirectional support (131) Support (132) Ball Support (133) Friction Support (134) Hemispherical Friction Support (2) Stiffness Controllable Mechanism (21) Lever Arm (211) Center Support Point (212) Connection Point (213) Connection Point • ( 22) Bundle path (23) Bundle path i (24) Bundle path (25) Link (26) Elastomer (27) Slot (3) Positioning drive device (4) Isolation object (5) Ground (6) controller (61) sensor 14

Claims (1)

1308610 X. Patent application scope: 1. - A controllable isolation system 'mainly includes: isolation platform, stiffness controllable mechanism, positioning drive equipment; wherein: the isolation platform' is used to house the isolated earthquake An object, the lower end surface of the isolation platform is provided with a support for carrying the weight of the upper object to be isolated, and the support is movable on the support surface thereof; the stiffness controllable mechanism comprises a lever arm, the lever arm The utility model has a central support point which can be moved left and right, and two connection points which can be moved back and forth. The movement path of the connection point is perpendicular to the path of the central support point, and one of the connection points can be connected with the isolation platform by the connecting rod, and is affected by The bundle path limits its movement path, and the other connection point is connected with an elastic body to provide the isolation platform restoring force; the positioning driving device is used for instantly controlling the lever arm center support point of the stiffness controllable mechanism The position, in order to change the length of the left and right of the lever arm, can instantly change the isolation stiffness and the isolation frequency of the isolation system. 2. The controllable vibration isolation system of claim 1, wherein the support of the isolation platform is that the roller supports the rolling on the road. 3. The controllable vibration isolation system according to claim 1, wherein the support of the isolation platform is a sliding support, and the built-in friction interface material slides on the track path. 4. The controllable vibration isolation system of claim 1, wherein the support of the 'isolation platform can be rolled by rolling support on an arcuate curved edge having an arbitrary curvature. 5. The controllable vibration isolation system of claim 1, wherein the support of the seismic isolation platform is slidable by frictional support on an arcuate path having an arbitrary curvature. The controllable vibration isolation system of claim 1, wherein the support of the seismic isolation platform is an elastic support. 7. The controllable vibration isolation system of claim 1, wherein the length of the lever arm in the stiffness controllable mechanism is retractable. 8. The controllable vibration isolation system according to claim 1, wherein the longitudinal end of the lever arm of the stiffness controllable mechanism is provided with two slots for any of the central support point and the second connection point. The point is free to slide in the slot. 9. The controllable vibration isolation system of claim 1, wherein the lever arm center support point in the stiffness controllable mechanism is intermediate to the two connection points. 10. The controllable vibration isolation system of claim 1, wherein the lever arm center support point in the stiffness controllable mechanism is disposed on the other side of the two connection points. 11. The controllable vibration isolation system of claim 1, wherein the elastomer in the stiffness controllable mechanism is a spring. 12. The controllable vibration isolation system of claim 1, wherein the elastomer in the stiffness controllable mechanism is rubber. 13. The controllable vibration isolation system of claim 1, wherein the elastomer in the stiffness controllable mechanism is an artificial composite. 14. The controllable vibration isolation system of claim 1, wherein the positioning drive device is an electric motor and a lead screw set. 15. The controllable vibration isolation system of claim 1, wherein the positioning drive device is a hydraulic actuation device. 16. The controllable vibration isolation system of claim 1, wherein the isolated object is a general civil structure. The controllable isolation system of claim 1, wherein the isolated object can be a general device. 18. The controllable vibration isolation system of claim 1, wherein the object to be isolated is a high precision device. 19. The controllable vibration isolation system of claim 1, wherein the object to be isolated is a storage tank. 20. For the controllable isolation system described in claim 1, wherein the upper and lower two-layer isolation platform can be directly stacked to form a two-way isolation system, the upper layer is y-direction isolation, and the lower layer is X-isolated. 21. The controllable vibration isolation system according to claim 1, wherein the vibration isolation platform is provided with an upper and lower two layers of vertically adjustable power control mechanisms, and the upper layer can change the y-direction isolation. Stiffness, while the lower layer can change the X-direction isolation stiffness, and there is a bidirectional support between the lower end surface of the isolation platform and the ground to carry the weight of the isolated object. 22. The controllable vibration isolation system of claim 21, wherein the bidirectional support of the two-way isolation system is an elastic support. 23. The controllable vibration isolation system of claim 21, wherein the bidirectional support of the two-way isolation system is a rolling ball support rolling on a planar path. 24. The controllable vibration isolation system of claim 21, wherein the bidirectional support of the two-way isolation system is that the ball supports the curved path. 25. The controllable vibration isolation system of claim 21, wherein the bidirectional support of the two-way isolation system is movable by frictional support on a planar path. 26. For controllable isolation systems as described in claim 21, 17 1308610 The bidirectional support of the two-way isolation system can be supported by a hemispherical friction bearing on a curved path. 27. The controllable vibration isolation system of claim 24, wherein the curved path of the two-way isolation system is a three-dimensional curved surface. 18