A suspended inertia variable enhanced tuned mass damper for tall chimneys

Abstract

The application discloses a suspension type inertial capacity enhanced tuned mass damper for high-rise chimneys, which is applied to self-standing chimneys and comprises a suspension mass ring, a suspension assembly and a universal eddy current inertial container. The suspension assembly is uniformly distributed on the outer surface of the self-standing chimney in a circumferential direction and is fixedly connected with the outer surface of the self-standing chimney. The other end of the suspension assembly is connected with the suspension mass ring. The suspension mass ring is uniformly distributed with connecting grooves in the circumferential direction. The inner wall of the connecting grooves is provided with mounting grooves on both sides. One end of the universal eddy current inertial container is connected with the suspension mass ring through the mounting grooves, and the other end is hingedly connected with the self-standing chimney. The application not only improves the damping performance of the damper and enhances the stability and reliability of the damper when responding to vibration, but also realizes the simplification of the overall material demand of the self-standing chimney by reducing the additional mass of the suspension mass ring, directly reduces the construction cost, and has a wide application range and high practicability.

Description

Technical Field

[0001] This invention relates to the field of structural vibration reduction technology, and in particular to a suspended inertial capacitance enhanced tuned mass damper for tall chimneys. Background Technology

[0002] Tall, self-supporting chimneys, renowned for their height, long natural period, and high toughness, are prone to significant dynamic responses under sustained external loads such as wind and earthquakes. Under these long-term dynamic loads, self-supporting chimneys are susceptible to structural deformation and even fatigue failure, directly impacting their safe and stable operation and service life. Therefore, effective control of the dynamic response of tall, self-supporting chimneys is crucial for ensuring their long-term safe operation. Currently, traditional tuned mass dampers are commonly used for vibration control in industrial chimneys. These dampers mainly consist of an additional mass block, a spring, and a viscous damper, and are installed at the top of the chimney's main structure for a tight connection. When the structure vibrates, the damper utilizes the resonance absorption principle of the mass block to transfer the vibration energy of the main structure to the additional mass block. The built-in viscous damping device then converts the energy into heat or other forms of energy for dissipation, thereby reducing the structure's dynamic response.

[0003] While traditional tuned mass dampers can achieve a certain degree of vibration reduction in building structures, the added mass not only generates significant vertical loads but also directly increases the design complexity of chimney structures. Specifically, this manifests as increased requirements for wall thickness and enhanced foundation bearing capacity, all of which raise overall construction costs. Furthermore, as viscous damping devices age, they also face durability issues such as natural material aging and gradual degradation of mechanical properties. These problems not only affect the effectiveness of the device but also foreshadow a significant increase in future maintenance costs. Summary of the Invention

[0004] In order to overcome the above-mentioned problems in the prior art, the present invention proposes a suspended inertial capacitance enhanced tuned mass damper for tall chimneys.

[0005] The technical solution adopted by this invention to solve its technical problem is: a suspended inertial-capacitance-enhanced tuned mass damper for tall chimneys, applied to a self-supporting chimney, including a suspended mass ring, a suspension assembly, and a universal eddy current inertial container. One end of the suspension assembly is circumferentially and uniformly distributed on the outer surface of the self-supporting chimney and fixedly connected to the outer surface of the self-supporting chimney. The other end of the suspension assembly is connected to the suspended mass ring. The suspended mass ring has connecting grooves circumferentially and uniformly distributed. The inner walls of the connecting grooves are provided with mounting grooves on both sides. One end of the universal eddy current inertial container is connected to the suspended mass ring through the mounting groove, and the other end is hinged to the self-supporting chimney.

[0006] The aforementioned suspended inertial capacity enhanced tuned mass damper for tall chimneys includes a universal eddy current inertial container comprising a helical rod, a horizontal rotating sleeve, a horizontal bearing, a copper rotating flywheel, and a flywheel sleeve. One end of the helical rod is hinged to the surface of a self-supporting chimney via a hinged support. The copper rotating flywheel is sleeved on the helical rod, and the internal thread of the copper rotating flywheel mates with the external thread on the surface of the helical rod. A flywheel sleeve is provided on the outer surface of the copper rotating flywheel. Permanent magnets are evenly distributed circumferentially on the flywheel sleeve, with adjacent permanent magnets having opposite polarities. The flywheel sleeve is connected to the horizontal rotating sleeve via a horizontal bearing, and the horizontal rotating sleeve is connected to the suspended mass ring via a mounting groove.

[0007] The aforementioned suspended inertial-capacitance-enhanced tuned mass damper for tall chimneys includes a metal flywheel ball bearing at the connection between the flywheel sleeve and the copper rotating flywheel, and a metal sleeve ball bearing at the connection between the horizontal rotating sleeve and the mounting groove.

[0008] The aforementioned suspended inertial-capacitance-enhanced tuned mass damper for tall chimneys includes a suspension assembly comprising a triangular bracket, a suspension connecting rod, and a connecting ring. One side of the triangular bracket is fixedly connected to a self-supporting chimney, and the other side of the triangular bracket is fixedly connected to the connecting rod. One end of the suspension connecting rod is hinged to the connecting rod, and the other end is connected to the suspended mass ring via the connecting ring.

[0009] The aforementioned suspended inertial capacitance-enhanced tuned mass damper for tall chimneys has an additional mass of 2% to 5% of the first modal mass of the self-supporting chimney, and the ratio of the oscillation frequency of the suspended mass ring to the natural frequency of the self-supporting chimney is 0.92 to 1.04.

[0010] The suspended inertial capacitance enhanced tuned mass damper for tall chimneys described above has a distance between adjacent permanent magnets and the width of the permanent magnets themselves, with a ratio of 0.6 to 0.8.

[0011] The aforementioned suspended inertial capacitance enhanced tuned mass damper for tall chimneys has an additional damping ratio ranging from 2% to 10% for the universal eddy current inertial container.

[0012] The aforementioned suspended inertial-capacity-enhanced tuned mass damper for tall chimneys has an inertial-capacity coefficient corresponding to the copper rotating flywheel that is 20% to 30% of the first-order modal mass of the self-supporting chimney.

[0013] The beneficial effects of this invention are that it utilizes the enhanced inertial mass effect exhibited by the copper rotating flywheel during rotation, effectively increasing the dynamic effective mass of the suspended mass ring and integrating the two into a highly efficient and synergistic whole. This design not only significantly improves the damping performance of the damper, enhancing its stability and reliability in the face of vibration, but also simplifies the overall material requirements of the self-supporting chimney by reducing the added mass of the suspended mass ring itself, directly reducing construction costs. This demonstrates a high degree of innovation and provides new ideas and practical examples for related fields. Furthermore, in this invention, one end of the precision helical rod is located below the suspended mass ring and its height is adjustable, further enhancing the inertial mass output of the universal eddy current inertial container.

[0014] This invention employs an eddy current damper as the energy-dissipating element. Compared to traditional energy-dissipating dampers, it exhibits superior vibration reduction performance, effectively suppressing vibrations while also boasting lower manufacturing costs. Furthermore, the eddy current damper's frictionless and fluid-free characteristics significantly enhance the equipment's environmental adaptability. These significant advantages work together to improve the performance of the self-supporting chimney, resulting in a comprehensive performance enhancement and greater flexibility to adapt to the challenges of diverse geographical environments, demonstrating the innovation and practicality of this invention.

[0015] This invention features a simple and reliable structural design and convenient manufacturing, while maintaining low cost. In particular, it has excellent vibration reduction performance, and the relevant parameters can be flexibly adjusted according to actual needs, which can effectively control the vibration response of tall flexible structures, thus having a wider range of applications. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the suspended mass ring of the present invention; Figure 3 This is a schematic diagram of the suspension assembly of the present invention; Figure 4 This is a schematic diagram of the universal eddy current inertial container of the present invention; Figure 5 This is an exploded view of the components of the universal eddy current inertial container of the present invention; Figure 6 This is a cross-sectional view of the universal eddy current inertial container of the present invention.

[0018] In the diagram, 1—self-supporting chimney, 2—suspended mass ring, 2a—connecting groove, 2b—mounting groove, 3—suspension assembly, 3a—suspension cable connecting rod, 3b—connecting rod, 3c—triangular bracket, 3d—connecting ring, 4—universal eddy current inertia container, 4a—hinged support, 4b—helical rod, 4c—external thread, 4d—horizontal rotating sleeve, 4e—metal rotating ball bearing, 4f—horizontal bearing, 4g—permanent magnet, 4h—copper rotating flywheel, 4j—internal thread, 4k—flywheel sleeve, 4m—magnet slot, 4n—metal sleeve ball bearing, 4p—metal flywheel ball bearing. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, this embodiment discloses a suspended inertial capacitance-enhanced tuned mass damper applicable to tall chimneys, mainly comprising a self-supporting chimney 1, a suspended mass ring 2, a suspension assembly 3, and a universal eddy current inertial container 4. Figure 2 As shown, the suspended mass ring 2 has a connecting groove 2a and a mounting groove 2b; as Figure 3 As shown, the suspension assembly 3 consists of a suspension connecting rod 3a, a connecting rod 3b, a triangular bracket 3c, and a connecting ring 3d. The lower end of the suspension connecting rod 3a is stably connected to the suspended mass ring 2 via the connecting ring 3d, and the upper end is connected to the triangular bracket 3c via the connecting rod 3b. This triangular bracket 3c is then firmly welded to the self-supporting chimney 1.

[0021] like Figure 4-6 As shown, the universal eddy current inertia container 4 is composed of a hinged support 4a, a helical rod 4b, an external thread 4c, a horizontal rotating sleeve 4d, a metal rotating ball 4e, a horizontal bearing 4f, a permanent magnet 4g, a copper rotating flywheel 4h, an internal thread 4j, a flywheel sleeve 4k, a magnet groove 4m, a metal sleeve ball 4n, and a metal flywheel ball 4p. The hinged support 4a of the universal eddy current inertial container 4 is directly welded to the self-supporting chimney 1. The spiral rod 4b is connected to the copper rotating flywheel 4h through the precise fit of the external thread 4c and the internal thread 4j. The copper rotating flywheel 4h is placed inside the flywheel sleeve 4k and is effectively prevented from slipping out by the metal flywheel ball 4p and the groove. The permanent magnet 4g is embedded in the magnet groove 4m of the flywheel sleeve 4k, and the flywheel sleeve 4k is stably connected to the horizontal rotating sleeve 4d through the horizontal bearing 4f. Similarly, in order to prevent the flywheel sleeve 4k from slipping, it is also equipped with the anti-slip design of the metal rotating ball 4e and its groove. The horizontal rotating sleeve 4d is connected to the mounting groove 2b on the suspended mass ring 2 by means of the upper and lower metal sleeve ball 4n.

[0022] The additional mass of the suspended mass ring 2 is 2% to 5% of the first modal mass of the self-supporting chimney 1. By adjusting the length of the suspension cable connecting rod 3a, the ratio of the oscillation frequency of the suspended mass ring 2 to the natural frequency of the self-supporting chimney 1 is 0.92 to 1.04.

[0023] By adjusting the distance between adjacent permanent magnets 4g, the ratio of their spacing to the width of the permanent magnet 4g itself is maintained at 0.6~0.8.

[0024] By adjusting the gap between the permanent magnet 4g and the copper conductor, i.e. the non-contact gap between them, the additional damping ratio of the suspended eddy current damper can be made to range from 2% to 10%.

[0025] The suspension components and the universal eddy current inertial container are both arranged in a centrally symmetrical manner, and the adjacent permanent magnets are arranged on the flywheel sleeve 4k with opposite polarities.

[0026] By adjusting the thread pitch of the external thread 4c on the precision screw rod 4b and adjusting the mass of the copper rotating flywheel 4h, the inertia coefficient of the copper rotating flywheel 4h is made to be 20%~30% of the mass of the first mode of the self-supporting chimney.

[0027] The universal eddy current inertial container 4 can swing arbitrarily in the horizontal plane by setting a hinged support 4a, a horizontal rotating sleeve 4d, and a horizontal bearing 4f.

[0028] Within the limits of the strength of the precision screw rod 4b, the hinged support 4a should be positioned at the lower end of the self-supporting chimney 1.

[0029] When the self-supporting chimney 1 vibrates, the suspended mass ring 2 swings to absorb the vibration energy of the self-supporting chimney 1. The spiral rod 4b inside the universal eddy current inertia container 4 cleverly converts translation into rotation, driving the copper rotating flywheel 4h to rotate efficiently. During this conversion process, the inertia container significantly amplifies the horizontal inertial mass of the universal eddy current inertia container 4, far exceeding its physical mass, thereby enhancing the relative motion effect of the suspended mass ring 2 and significantly improving the energy dissipation and vibration reduction effect. The copper rotating flywheel 4h rapidly cuts magnetic field lines in the magnetic field constructed by the permanent magnet 4g. This dynamic process realizes the direct conversion of mechanical energy into electrical energy in the form of eddy currents, effectively dissipating the component energy and achieving the purpose of vibration reduction and energy dissipation.

[0030] Taking a self-supporting chimney as an example, the suspension assembly 3 is fixed to the top of the self-supporting chimney. The mass of the suspended mass ring 2 is set to 2% of the first-order modal mass of the self-supporting chimney 1, and the length of the suspension connecting rod 3a is adjusted so that the ratio of the oscillation frequency of the suspended mass ring 2 to the natural frequency of the self-supporting chimney 1 is 1. The vertical position of the hinge support 4a of the precision screw rod 4b is adjusted so that the hinge support 4a is located at 0.9 times the height of the chimney. The universal eddy current inertia container 4 adopts a centrally symmetrical design. Specifically, the suspended mass ring 2 is equipped with 6 suspension assemblies 3 and 6 sets of universal eddy current inertia containers 4, and the remaining devices are arranged accordingly. The spacing between the left and right adjacent permanent magnets 4g is adjusted so that the spacing is 0.7 times the width of the permanent magnet 4g itself. The gap between the permanent magnet 4g and the copper rotating flywheel 4h is adjusted so that the additional damping ratio provided by the eddy current damper is 4%. Adjust the thread pitch of the external thread 4c on the precision screw rod 4b and adjust the mass of the copper rotating flywheel 4h so that the inertia coefficient of the copper rotating flywheel 4h is 20% of the mass of the first mode of the self-supporting chimney.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its scope and spirit, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys, characterized in that, The invention is applied to self-supporting chimneys and includes a suspended mass ring, a suspension assembly, and a universal eddy current inertia container. One end of the suspension assembly is circumferentially and evenly distributed on the outer surface of the self-supporting chimney and is fixedly connected to the outer surface of the self-supporting chimney. The other end of the suspension assembly is connected to the suspended mass ring. The suspended mass ring has connecting grooves circumferentially and evenly distributed. The inner wall of the connecting grooves is provided with mounting grooves on both sides. One end of the universal eddy current inertia container is connected to the suspended mass ring through the mounting groove, and the other end is hinged to the self-supporting chimney. The universal eddy current inertial container includes a screw rod, a horizontal rotating sleeve, a horizontal bearing, a copper rotating flywheel, and a flywheel sleeve. One end of the screw rod is hinged to the surface of the self-supporting chimney via a hinged support. The copper rotating flywheel is sleeved on the screw rod, and the internal thread of the copper rotating flywheel mates with the external thread on the surface of the screw rod. A flywheel sleeve is provided on the outer surface of the copper rotating flywheel. Permanent magnets are evenly arranged circumferentially on the flywheel sleeve, and adjacent permanent magnets have opposite polarities. The flywheel sleeve is connected to the horizontal rotating sleeve via a horizontal bearing, and the horizontal rotating sleeve is connected to the suspended mass ring via an installation groove. Metal flywheel balls are provided at the connection between the flywheel sleeve and the copper rotating flywheel, and metal sleeve balls are provided at the connection between the horizontal rotating sleeve and the mounting groove.

2. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys according to claim 1, characterized in that, The suspension assembly includes a triangular bracket, a suspension connecting rod, and a connecting ring. One side of the triangular bracket is fixedly connected to the self-supporting chimney, and the other side of the triangular bracket is fixedly connected to the connecting rod. One end of the suspension connecting rod is hinged to the connecting rod, and the other end is connected to the suspension mass ring through the connecting ring.

3. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys according to claim 1, characterized in that, The additional mass of the suspended mass ring is 2% to 5% of the first modal mass of the self-supporting chimney, and the ratio of the oscillation frequency of the suspended mass ring to the natural frequency of the self-supporting chimney is 0.92 to 1.

04.

4. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys according to claim 1, characterized in that, The ratio of the distance between adjacent permanent magnets to the width of the permanent magnet itself is 0.6 to 0.

8.

5. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys according to claim 1, characterized in that, The additional damping ratio of the universal eddy current inertial container ranges from 2% to 10%.

6. A suspended inertial capacitance-enhanced tuned mass damper for tall chimneys according to claim 1, characterized in that, The inertia coefficient of the copper rotating flywheel is 20% to 30% of the first-order modal mass of the self-supporting chimney.

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