CN107841938A - It is a kind of can continuous frequency modulation Novel sliding TMD - Google Patents

Abstract

The invention relates to the technical field of vibration reduction and disaster prevention of building structures, and discloses a novel sliding TMD capable of continuous frequency modulation. and the damper are all arranged on the support, and the adjustment plate and the spring are respectively arranged at both ends of the support, the rotating connecting plate is arranged above the supporting, one end of the rotating connecting plate is connected with the adjusting plate in rotation, and the other end of the rotating connecting plate Supported by springs, the mass block is slidably arranged on the rotating connecting plate, the height of the rotating connecting plate relative to the support is adjustable, and the position of the spring on the support is adjustable. The invention solves the problems that the frequency of the frequency modulation mass damper cannot be continuously adjusted and the frequency modulation range is small.

Description

A Novel Sliding TMD with Continuous Frequency Tuning

technical field

The invention relates to the technical field of vibration reduction and disaster prevention of building structures, and discloses a novel sliding TMD capable of continuous frequency modulation.

Background technique

With the development of urban construction, the urban transportation network has become more and more developed, and various structures such as long-span bridges, corridors, large roofs, and high-speed rail station buildings have been widely used, bringing great convenience to people's lives . However, although the strength and stiffness of this type of building are relatively easy to meet the design requirements, the frequency of its vertical vibration is generally relatively low, and it is prone to resonance under the action of wind load, pedestrians, vehicles and other dynamic loads, resulting in damage to the bridge itself. Even seriously threaten the safety of pedestrians and vehicles. In addition, some thin and tall buildings or large steel structures, such as chimneys and stadiums, are also prone to resonance under the action of external wind excitation or personnel action excitation. In order to prevent the destructive resonance of such long-span or slender structures with low frequency, people invented the frequency-modulated mass damper, which adjusts its natural frequency to be close to the natural frequency of the structure, and then installs it on the structure.

A frequency-modulated mass damper (TMD) is composed of a mass block, a spring, and a damping system. When the structure of a building is disturbed by an exciting force and vibrates, the resonance of the frequency-modulated mass damper is caused, and the vibration inertial force of the frequency-modulated mass damper is used to react on the The structure itself, so as to offset the exciting force and achieve the purpose of reducing the structural response. Therefore, to effectively exert the damping effect of the tuned mass damper, it needs to be inherently kept at an optimal value. In actual production, not only the actual resonant frequency of bridges and other buildings deviates from the design, but also the mass stiffness, damping ratio and other parameters of the FM mass damper are the results of the theoretical calculation of the design, due to the deviation of the calculation results and the deviation of the manufacturing results And other factors change, it is difficult to achieve the effect of satisfying the actual vibration reduction. Therefore, it is necessary to adjust the inherent properties of the FM mass damper within a certain range until it meets the requirements of use. And when the specific parameters of the building structure change, the frequency modulation mass damper can also be adjusted so that it can achieve the best working state and the best vibration reduction effect.

In order to solve this problem, the mass block is generally designed as a structure in which multiple steel plates are stacked together, and the method of increasing or decreasing the steel plates is used to adjust the frequency modulation mass damper, but this type of structure cannot be adjusted continuously and accurately , can only be roughly adjusted, the FM mass damper cannot achieve the best working condition, and cannot achieve continuous frequency modulation of the FM mass damper, and the frequency modulation range is small. Therefore, it is necessary to provide a frequency modulation mass damper capable of continuous frequency modulation, so as to solve the problems that the frequency of the frequency modulation mass damper cannot be continuously adjusted and the frequency modulation range is small.

Contents of the invention

The technical problem to be solved by the present invention is that the frequency modulation mass damper in the prior art cannot realize continuous frequency modulation and the adjustment range is limited.

In order to solve the above technical problems, the present invention discloses a novel sliding TMD capable of continuous frequency modulation, including a spring, an adjusting plate, a rotating connecting plate, a damper, a mass block and a support, the adjusting plate, the spring and the The dampers are all arranged on the support, and the adjusting plate and the spring are respectively arranged at both ends of the support, the rotating connecting plate is arranged above the supporting, and the rotating connecting plate One end is rotatably connected with the adjustment plate, the other end of the rotatable link plate is supported by the spring, the mass block is slidably arranged on the rotatable link plate, and the height of the rotatable link plate relative to the support is Adjustable, the position of the spring on the support is adjustable.

Further, the frequency modulation range of the novel sliding TMD capable of continuous frequency modulation is greater than 50%.

Preferably, the mass block is arranged on the rotating connecting plate through a linear slide rail.

Preferably, the mass block is arranged on the rotating connecting plate through a slide plate.

Further, the adjustment plate is provided with an adjustment hole, the adjustment plate includes a first adjustment plate and a second adjustment plate, and the adjustment hole includes the first adjustment hole on the first adjustment plate and the first adjustment hole on the The second adjustment hole on the second adjustment plate, the first adjustment plate and the second adjustment plate are arranged symmetrically with respect to the center line of the support.

Preferably, the spring includes a first spring and a second spring, and the first spring and the second spring are arranged symmetrically with respect to the center line of the support.

Preferably, the rotating connecting plate is connected to the adjusting plate through a rotating shaft, and the two ends of the rotating shaft respectively pass through the first adjusting hole and the second adjusting hole.

By adopting the above technical solution, the novel sliding TMD capable of continuous frequency modulation in the present invention has the following beneficial effects:

1) The TMD of the present invention can change the overall effective stiffness of the TMD by adjusting the position of the mass on the rotating connecting plate, adjusting the height of the rotating connecting plate, and changing the position of the spring on the support, so as to realize frequency modulation Purpose;

2) In the present invention, bolt holes are provided on the first side and the second side of the rotating connecting plate, and the locking of the mass block at different bolt holes is realized through the locking plate, so as to achieve the purpose of high frequency modulation range, and the frequency modulation range can reach 50 %above;

3) During the TMD transportation process, the rotating connecting plate and the support are locked by the locking plate, so as to realize the fixed position of the spring and avoid changing the position of the spring during transportation. After the TMD is installed on the main building, the locking version is unlocked, and the TMD start working.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the structural representation of the novel sliding TMD that can continuously tune frequency described in embodiment 1;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is the fabrication method of the novel sliding TMD capable of continuous frequency modulation described in embodiment 2;

Fig. 5 is a structural schematic diagram of a novel sliding TMD capable of continuous frequency modulation described in Embodiment 3;

Fig. 6 is the front view of Fig. 5;

Figure 7 is a top view of Figure 5;

In the figure, 1-support, 2-spring, 3-damper, 4-locking plate, 5-rotation connecting plate, 6-linear guide rail, 61-first slide bar, 62-second slide bar, 63-the first One slide block, 64-the second slide block, 7-fixed plate, 8-fast quality, 9-adjusting plate, 10-rotating shaft, 11-adjusting hole, 12-slide plate, 13-connecting block, 14-fixed block.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention. The invention and the simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. Also, the terms "first", "second", etc. are used to distinguish similar items and not necessarily to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

Example 1:

In order to solve the existing problems in the prior art, this implementation provides a structure of a new type of sliding TMD that can be continuously tuned. Specifically, refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, including spring 2, adjustment plate 9 , rotating connecting plate 5, damper 3, mass block 8 and bearing 1, described adjustment plate 9, described spring 2 and described damper 3 are all arranged on the described bearing 1, and described adjustment plate 9 and the spring 2 are respectively arranged at both ends of the support 1, one end of the rotating connecting plate 5 is rotationally connected with the adjusting plate 9, and the other end of the rotating connecting plate 5 is supported by the spring 1, so The mass block 8 is slidably arranged on the rotating connecting plate 5 , the height of the rotating connecting plate 5 relative to the support 1 is adjustable, and the position of the spring 2 on the support 1 is adjustable.

As a preferred embodiment, in this embodiment, the positive direction of the X-axis in the XOY coordinate system is the direction in which the mass block 8 moves away from the adjustment plate.

Preferably, in this embodiment, the spring 2 includes a first spring and a second spring, and the first spring and the second spring are arranged symmetrically along the center line of the support 1 in the X-axis direction , the positions of the first spring and the second spring on the support 1 are adjustable, and when the spring is adjusted, the first spring and the second spring are adjusted symmetrically and synchronously. The damper 3 is arranged on the support 1, and is arranged at the same end of the support 1 as the spring 2, further, the damper 3 is arranged on the first spring and the second spring middle. Preferably, the damper 3 is a velocity damper. It can be understood that the setting position of the damper 3 is set according to the design requirements, specifically, the position of the damper 3 is set according to the damping of the damper 3 required by the device, so as to ensure that the damping effect can be exerted. The best damping effect of the damper 3, the position setting of the above-mentioned damper 3 is only a preferred embodiment.

Further, preferably, in this embodiment, the rotating connecting plate 6 is connected to the adjusting plate 9 through a rotating shaft 10 . Specifically, the adjusting plate 9 includes a first adjusting plate and a second adjusting plate, and the spring 2 includes a first spring and a second spring, and the first adjusting plate and the second adjusting plate are relative to the rotating connecting plate 5. The center line in the X-axis direction is symmetrically arranged on the same end of the support 1, and the first spring and the second spring are symmetrically arranged on the other end of the support 1 relative to the center line in the X-axis direction of the rotating connecting plate. one end. Further, the first adjustment plate is provided with a first adjustment hole, and the second adjustment plate is provided with a second adjustment hole. Preferably, both the first adjustment hole and the second adjustment hole are waist-shaped hole.

Further, both ends of the rotating shaft 10 are provided with external threads, and the two ends of the rotating shaft 10 respectively protrude from the first adjustment hole and the second adjustment hole, and the middle of the rotating shaft 10 is sleeved with a connecting block 13. The other end of the connecting block 13 is fixedly connected to the rotating connecting plate 5, and the height adjustment of the rotating connecting plate 5 is realized by adjusting the rotating shaft 10 to slide up and down in the first adjusting hole and the second adjusting hole , by adjusting the position of the spring 2 on the support 1, adjust the different inclinations of the rotating connecting plate 5 at different heights, and drive the rotating connecting plate 5 through the rotation of the connecting block 13 around the rotating shaft 10 Plate 5 rotates to accommodate different inclinations. It can be understood that, when the rotating connecting plate 5 is adjusted to the required height, the nuts cooperate with the external threads at both ends of the rotating shaft 10 to realize the rotation of the rotating shaft 10 on the first adjusting plate and the second adjusting plate. of the lock.

Further, preferably, in this implementation, the mass block 8 is arranged on the rotating connecting plate 5 through the linear guide rail 6, specifically, the linear guide rail 6 includes a first slide bar 61 and a second slide bar 62, the first slide bar 61 and the second slide bar 62 are arranged symmetrically with respect to the center line of the rotation connecting plate 5 in the X-axis direction, the first slide bar 61 is sleeved with a first slide 63, the The second slide bar 62 is sleeved with a second slide block 64, the bottom of the mass block 8 is welded on the first slide block 63 and the second slide block 64, through the first slide block 63 and the second slide block 64 The slide of the slider 64 on the first slide bar 61 and the second slide bar 62 drives the mass block 8 to slide back and forth along the X-axis direction. It can be understood that, by slidingly adjusting the position of the mass block 8 on the rotating connecting plate 5, the overall effective stiffness of the TMD is changed to realize frequency adjustment.

Further, the rotating connection plate 5 includes a first side and a second side, the first side is on the same side as the first adjusting plate 1, and the second side is on the same side as the second adjusting plate, so A plurality of first bolt holes are arranged at intervals on the first side, and a plurality of second bolt holes are arranged at intervals on the second side, the first bolt holes and the second bolt holes are arranged in one-to-one correspondence, and the mass Two third bolt holes are arranged on the same side of the block 8 as the first side, and a fourth bolt hole is arranged on the same side of the mass block 8 as the second side, and the third bolt holes and The fourth bolt holes are provided in one-to-one correspondence.

Further, the TMD also includes a plurality of fixing plates 7, and both ends of the fixing plates 7 are provided with through holes. When the mass block 8 slides to the required position, two of the plurality of fixing plates 7 are The through hole at one end of the fixing plate 7 is matched with the third bolt hole on the mass block 8 and fixed by bolts, and the through hole at the other end of the fixing plate 7 is connected with the third bolt hole on the first side of the rotating connecting plate 5. After a bolt hole is matched, it is fixed with bolts. At the same time, the through holes at one end of two of the fixed plates 7 in the plurality of fixed plates 7 are matched with the fourth bolt hole on the mass block 8 and fixed, and the fixed plates 7 are fixed. The through hole at the other end of the rotatable connecting plate 5 is fixed with bolts after matching with the second bolt hole on the second side surface of the rotating connecting plate 5 . Through the above fixing, the locking of the mass block 8 is realized. It can be understood that the cooperation between the fixing plate 7 and any one of the first bolt holes or any one of the second bolt holes is determined by the user according to needs. As a preference, when setting the relative position of locking of the first bolt hole and the third bolt hole and setting the relative position of locking of the second bolt hole and the fourth bolt hole, it can be connected according to the rotation The length of the first side and the second side of the plate 5 and the length of the corresponding side of the mass block 8 are set so that the fixed plate 7 on the same side is connected to the first bolt hole and the third bolt hole or the fixed plate 7 is connected to the first bolt hole. After the second bolt hole and the fourth bolt hole, there is a certain angle between the two plates. Preferably, a triangular structure is formed between the two fixed plates 7 on the same side and the sides of the rotating connecting plate 5 to improve the The stability of the mass block 8 is described to prevent the mass block 8 from sliding on the linear slide rail 6.

Further, the above-mentioned locking plate is used to realize the locking of the mass block 8 at different bolt holes, so as to realize the purpose of high frequency modulation range, and the frequency modulation range can reach more than 50%.

Further, the TMD also includes a plurality of locking plates 4, preferably, in this embodiment, two locking plates 4 are included, specifically including the first locking plate and the second locking plate; the support 1 is also provided with There are a plurality of fixed blocks 14, preferably, in this embodiment, the number of the fixed blocks 14 is two, including a first fixed block and a second fixed block, the first fixed block and the second fixed block The block is arranged symmetrically with respect to the center line of the support in the X-axis direction, and the first fixed block and the second fixed block are provided with bolt holes, through which one end of the first locking plate connects with the second locking plate on the rotating connecting plate. One bolt hole is connected, and the other end is connected with the bolt hole on the first fixed block, and at the same time, one end of the second locking plate is connected with the second bolt hole on the rotating connecting plate 5, and the other end is connected with the second bolt hole. The bolt holes on the fixed block are connected to realize the fixed connection between the rotating connecting plate 5 and the support 1 . It can be understood that, when the TMD capable of continuous frequency adjustment is in the process of transportation, the rotating connecting plate 5 is connected and fixed to the support 1 through the above-mentioned first locking plate and the second locking plate, so as to lock the spring 2 is stuck to prevent the spring 2 from moving during transportation. After the TMD is transported and installed on the main building, the first locking plate and the second locking plate are unlocked to make the TMD work.

Further, for ease of understanding, the present invention provides a specific manufacturing and implementation method of the novel sliding TMD capable of continuous frequency modulation, referring to Figure 4, specifically, including the following steps:

S1. Determine the parameters of the spring 2, the parameters of the damper 3, and the block weight of the mass 8 according to the architectural drawings and design requirements; it can be understood that the parameters of the spring 2, the parameters of the damper 3, and the weight of the mass block 8 It is selected according to customer requirements, and the parameters of spring 2 are used as an example to illustrate:

According to the calculation formula of spring stiffness:

In the formula: K-spring stiffness, unit is n/m; G-wire rigidity modulus, steel: G=8×10 ⁴ MPa=8×10 ¹⁰ Pa, bronze: G=4×10 ⁴ MPa=4× 10 ¹⁰ Pa; d-spring wire diameter, in m; D-spring center diameter, in m; N-spring effective number of coils. For example, the customer asks us to make a compression spring whose spring material is steel. The diameter of the spring wire is 0.8mm, the middle diameter of the spring is 9mm, the total number of turns is 6, and the number of effective turns (number of supporting turns) is 5. Then, according to the above spring stiffness formula, it can be calculated

K=1.12X103N/m=1.12N/mm; further, if you want to adjust the stiffness of the spring, you can change any one or several of the above parameters, and keep the other parameters unchanged, or if you keep the spring stiffness constant In the case of , if you want to change one of the parameters as a demand parameter, you can adjust other parameters to balance the demand parameter and obtain the same spring stiffness.

Further, the parameters of the damper 3 and the weight of the mass block 8 are also calculated or set according to customer requirements.

S2. Process or purchase spring 2, damper 3 and mass 8 that meet the requirements of step S1 according to the calculation results in step S1;

S3. Determine the dimensions of the components of the novel sliding TMD that can be continuously tuned in frequency according to architectural drawings and design requirements; preferably, the components of the novel sliding TMD that can be tuned continuously in frequency are not the spring 2 and the damper that are processed or purchased in step S2 3 and the mass block 8 also include a support 1 (the support is provided with two fixed blocks 14, including the first fixed block and the second fixed block), an adjustment plate 9 (the number of 9 of the adjustment plate is two, Including a first adjusting plate, a second adjusting plate,) a linear guide rail 6 (including a first slide bar 61, a second slide bar 62, a first slide block 63 and a second slide block 64), a rotating shaft 10, a connecting block 13, Rotate the connecting plate 5, the locking plate 4 (the number of the locking plate 4 is two, including the first locking plate and the second locking plate), four fixing plates 7 and matching bolts for different parts.

S4. Process each component according to the size of each component determined in step S3;

S5. Install the spring 2, the damper 3, the mass block 8 and other components according to the drawing of the new sliding TMD capable of continuous frequency modulation. Specifically, according to the spring 2, the damper 3, the mass block 8 and the installation positions of the components determined in the previous part of this embodiment, the final new sliding TMD with continuous frequency adjustment is formed.

Specifically, before making the above-mentioned new sliding TMD capable of continuous frequency modulation, first determine the clearance of the position where the TMD is to be placed according to the architectural and structural drawings. It can be understood that the width of the TMD should not be less than 300mm. There will be a certain amplitude during the vibration process, so a certain height should be reserved in the height direction of the TMD position, and the height should not be less than 100mm. The length of the TMD is designed according to the quality of the TMD and its height and width.

Example 2:

Referring to Fig. 5, Fig. 6 and Fig. 7, in this embodiment, different from Embodiment 1, in this embodiment, the mass block 8 is arranged on the rotating connecting plate 5 through the slide plate 12, specifically, the Said slide plate 12 comprises a first slide plate and a second slide plate, said first slide plate and a second slide plate are all arranged on said rotating connecting plate 5, as preferably, the material of said slide plate 12 is polytetrafluoroethylene, said The coefficient of friction between the first slide plate and the second slide plate and the rotating connecting plate 5 is 0.06, and the mass block 8 is welded and fixed with the first slide plate and the second slide plate respectively, and the Sliding on the rotating connecting plate 5 drives the mass block 8 to slide on the rotating connecting plate 5 to realize position adjustment of the mass block 8 and frequency adjustment. Further, in this embodiment, according to the above-mentioned structure of the new type sliding TMD capable of continuous frequency modulation, specific production and implementation is carried out. The difference from Embodiment 1 is that the components of the new type sliding TMD capable of continuous frequency modulation are excluded from step S2. The processed or purchased spring 2, damper 3 and mass block 8 also include a support 1 (two fixed blocks 14 are arranged on the support, including a first fixed block and a second fixed block), two adjustment plates 9, (comprising the first adjusting plate and the second adjusting plate), slide plate 12 (comprising the first sliding plate and the second sliding plate), rotating shaft 10, connecting block 13, rotating connecting plate 5, locking plate 4 (comprising the first locking plate and the second two locking plates), four fixing plates 7 and matching bolts for different components.

Further, in all the above-mentioned embodiments, in addition to connecting the rotating connecting plate 5 with the adjusting plate 9 through a rotating shaft, it can also be connected with the adjusting plate through a universal ball bearing or a rod end joint bearing, so as to The rotation connection between the rotation connection plate 5 and the adjustment plate 9 is realized.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A novel sliding TMD capable of continuous frequency modulation is characterized in that it comprises a spring (2), an adjusting plate (9), a rotating connecting plate (5), a damper (3), a mass block (8) and a support ( 1), the adjustment plate (9), the spring (2) and the damper (3) are all arranged on the support (1), and the adjustment plate (9) and the spring ( 2) respectively arranged at both ends of the support (1), the rotating connection plate (5) is arranged above the support (1), and one end of the rotating connecting plate (5) is connected with the adjusting plate (9) rotation connection, the other end of the rotation connection plate (5) is supported by the spring (2), the mass block (8) is slidably arranged on the rotation connection plate (5), the rotation connection The height of the plate (5) relative to the support (1) is adjustable, and the position of the spring (2) on the support (1) is adjustable. 2. The novel sliding TMD capable of continuous frequency modulation according to claim 1, characterized in that the frequency modulation range of the novel sliding TMD capable of continuous frequency modulation is greater than 50%. 3. The novel sliding TMD capable of continuous frequency modulation according to claim 1, characterized in that the mass (8) is arranged on the rotating connecting plate (5) through a linear slide rail (6). 4. The novel sliding TMD capable of continuous frequency modulation according to claim 1, characterized in that, the mass block (8) is arranged on the rotating connecting plate (5) through a sliding plate (12). 5. The novel sliding TMD capable of continuous frequency modulation according to claim 1, characterized in that, the adjusting plate (9) is provided with an adjusting hole (11), and the adjusting plate (9) includes a first adjusting plate and The second adjusting plate, the adjusting hole (11) comprises a first adjusting hole arranged on the first adjusting plate and a second adjusting hole arranged on the second adjusting plate, the first adjusting plate and The second adjusting plate is arranged symmetrically with respect to the center line of the support (1). 6. The novel sliding TMD capable of continuous frequency adjustment according to claim 1, characterized in that, the spring (2) includes a first spring and a second spring, and the first spring and the second spring are relative to the support Seat (1) central line is arranged symmetrically. 7. The novel sliding TMD capable of continuous frequency modulation according to claim 1, 3 or 4, characterized in that, the rotating connecting plate (5) is connected to the adjusting plate (9) through a rotating shaft (10), and the Both ends of the rotating shaft (10) pass through the first adjustment hole and the second adjustment hole respectively. 8. The novel sliding TMD capable of continuous frequency modulation according to claim 7, characterized in that the rotating connecting plate (5) is connected to the adjusting plate through a universal bearing or a rod end joint bearing. 9. The novel sliding TMD capable of continuous frequency modulation according to claim 8, characterized in that the rotating connecting plate (5) is fixedly connected to the support (1) through a locking plate (4). 10. The novel sliding TMD capable of continuous frequency modulation according to claim 1, 3 or 4, characterized in that the mass block (8) is connected to the rotating connecting plate (5) through a fixed plate (7) fixed.