[0054] Example 1
[0055] This embodiment provides a vertical vibration damping device as an example of a vertical vibration damper. The vibration damping device includes a rectangular inner shell, a rectangular outer shell, a cover plate 2 connected to the rectangular outer shell, and a cover plate 2 located on one side of the cover plate. The inner shell is a closed inner shell that accommodates the damping liquid medium; the upper and lower ends of the inner shell and the inner wall of the outer shell are respectively provided with damping members in the axial direction. In this embodiment, the rectangular inner shell is the outer shell 8 of the damping liquid energy dissipation and vibration reduction device, the rectangular outer shell is the shock absorber shell 4 , and the damping liquid medium is the damping liquid 12 .
[0056] The inner and outer walls of the inner shell are provided with symmetrically arranged shock absorbing members.
[0057] The inner wall of the casing is provided with a plate-type shock absorbing member.
[0058] The shock absorbing member in the inner shell is a partition plate 13 perpendicular to the axial direction, and the height of the partition plate in the axial direction is less than the height of the damping liquid medium contained; the partition plate is provided with a or through holes with more than one pore size.
[0059] When the diameters of the through holes are two kinds, the two kinds of diameters are 1mm-2mm and 0.5mm-1mm respectively, and the percentage of the total area of the holes in the total area of the separator is 40%-60%. spaced arrangement. In this embodiment, the large hole 12 is the diameter of 1 mm to 2 mm, and the small hole 13 is the diameter of 0.5 mm to 1 mm.
[0060] The shock absorbing members on the outer wall of the inner shell are permanent magnets 14 arranged according to SN, and the number of which is at least two.
[0061] The inner wall of the casing is provided with a plate-type shock absorbing member, which is a conductor back iron 5 and a copper conductor plate 6 arranged in sequence from the outer wall to the inner wall.
[0062] The distance between the permanent magnet 14 and the copper conductor plate 6 is 1 mm˜7 mm.
[0063] The inner and outer shells are connected by vertical guide rods 7 .
[0064] The axial damping member is a spring 11 .
[0065] The material of the damping liquid medium is dimethyl silicone oil.
[0066] The height of the damping liquid medium is 30% to 50% of the height of the inner shell
[0067] The inner shell is prepared from the following components by mass percentage: chromium (Cr)≤0.04, zirconium (Zr) 0.08-0.15, zinc (Zn) 5.7-6.7, silicon (Si)≤0.12, iron ( Fe) 0.000~0.150, manganese (Mn)≤0.10, magnesium (Mg) 1.9~2.6, titanium (Ti)≤0.06, copper (Cu) 2.0~2.6, aluminum (Al) balance.
[0068] The shell is made of Ti-15, Mo-3, AI-2.7, Nb-0.2, Si.
[0069] The method for determining the mass of the damping liquid medium in the vertical shock absorber and the method for determining the mass of the damping liquid medium in the vertical shock absorber, including:
[0070] Obtain the acceleration resonance frequency based on the acceleration amplitude-frequency characteristic curve of the shock absorber;
[0071] Calculate the natural frequency from the acceleration resonance frequency;
[0072] Calculates the mass of the damping liquid medium from the natural frequencies.
[0073] The calculation formula of the natural frequency is:
[0074]
[0075] where ω is the acceleration resonance frequency, ω n is the natural frequency of the shock absorber, and ξ is the damping ratio of the shock absorber.
[0076] The formula for calculating the mass of the damping liquid medium is:
[0077]
[0078] where m f is the mass of the damping liquid medium, w n is the natural frequency of the shock absorber, k is the stiffness of the shock absorber, m 1 is the structural mass of the shock absorber.
[0079] The patent of the present invention provides a double damping variable mass vertical vibration damper. Two sets of damping and vibration damping devices are encapsulated inside the vibration damping device. One set is a damping fluid energy dissipation device, and the other is an eddy current energy dissipation device. The structure of the vertical vibration damper is composed of a wire clamp 1, a damper shell 4, a damping fluid energy dissipation device, and an eddy current energy dissipation device. The wire clamp is connected to the transmission wire and the shock absorber. The damping fluid energy dissipation device in the shock absorber is composed of the damping device casing 8, the damping fluid 12, the baffle 13, the guide rod 7 and the spring 11. The overhanging end plates of the upper and lower ends of the damping fluid device are provided with circular holes. , allowing the connecting rod to pass through the hole. The connecting guide rod 7 plays a limiting role, so that the damping fluid device can only move in the up and down direction. The ends of the connecting guide rods are connected with the shock absorber housing 4 through the connecting springs 11 . The connecting guide rod is bolted to the cover plate 2 and the bottom plate of the damping device through the circular hole provided on the end plate of the damping liquid device. The eddy current energy dissipation device consists of a pair of permanent magnets 15 installed on the side of the damping liquid device, and a copper conductor plate 6 and conductor back iron 5 installed inside the shock absorber. figure 1 , figure 2 and image 3 shown. When the transmission wire vibrates in breeze due to wind load, the shock absorber vibrates up and down with the transmission wire. The damping fluid 12 in the damping device inside the shock absorber moves in the opposite direction of the movement of the damping device due to inertia, thereby generating a pressure opposite to the movement direction of the damping device. The pressure passes through the guide rod 7 and the spring 11 inside the shock absorber. It acts on the shock absorber, and then the shock absorber acts on the transmission line to reduce the wind vibration of the transmission wire. In addition, the viscosity of the damping liquid 12 in the Nei device can also play a role in dissipating wind energy (the damping of this dissipating wind energy comes from the boundary layer friction damping between the liquid and the solid wall of the container, the viscous damping inside the liquid and the Free surface damping, etc.), the damping device is provided with a baffle 13. The vertical vibration absorber forms the vibration damping effect on the transmission wire by utilizing the dynamic water pressure generated by the liquid sloshing and the energy consumption of the damping liquid. By changing the amount of liquid inside the damping liquid tank, the quality of the vertical vibration damper is changed, and then its natural frequency is changed, so that its natural frequency is consistent with the current breeze vibration frequency, so that it can achieve the optimal damping effect. Due to the strain hysteresis effect of the damping liquid device, a displacement difference is generated between the permanent magnet pair 15 installed on the side of the damping liquid device and the copper conductor plate 6 installed inside the shock absorber. The copper conductor plate 6 can cut the permanent magnet pair through vertical motion. The generated magnetic field lines, which in turn generate eddy current damping. Since the shock absorber has a double damping energy dissipation device, its energy dissipation capability is strong. In addition, the shock absorber uses the damping liquid damping device to deal with the current excitation frequency, and uses the eddy current damping device to deal with the excitation frequency that may be generated by the outside world. The effective damping frequency bandwidth of the vertical damper is increased by means of a double damping damping system.
[0080] The partition adopts a rectangular structure design with two circular holes, the diameters of the two circular holes are 1mm~2mm and 0.5mm~1mm respectively, and the total area of the holes accounts for 40%~60% of the whole partition area. The two kinds of holes with different diameters are arranged at intervals. The design structure of the partition plate 13 increases the resistance of the damping fluid passing through the partition plate, and obviously increases the damping energy dissipation capacity of the damping fluid.
[0081] In order to further improve the energy dissipation capability of the vibration damping device, the distance between the pair of permanent magnets 15 and the copper conductor plate 6 is set to be 1 mm to 7 mm. The height of the damping fluid accounts for 30% to 50% of the height of the damping fluid container.
[0082] The modal mass of the basic vibration shape of the damping fluid is generally 1% to 10% of the modal mass of the shock absorber.
[0083] attached figure 1 , figure 2 and image 3 The overall structure of the vertical shock absorber is given. The structure of the vertical vibration damper is composed of a wire clamp 1, a damper shell 4, a damping fluid energy dissipation device, and an eddy current energy dissipation device. The wire clamp 1 is connected to the power transmission wire and the shock absorber. The damping fluid energy dissipation device in the shock absorber is composed of the damping device casing 8, the damping fluid 12, the baffle 13, the guide rod 7 and the spring 11. The overhanging end plates of the upper and lower ends of the damping fluid device are provided with circular holes. , allowing the connecting rod to pass through the hole. The ends of the connecting guide rods are connected with the shock absorber housing 4 through the connecting springs 11 . The connecting guide rod is bolted to the cover plate 2 and the bottom plate of the damping device through the circular hole provided on the end plate of the damping liquid device. The eddy current energy dissipation device is composed of a pair of permanent magnets 15 installed on the side of the damping liquid device, and a copper conductor plate 6 and a conductor back iron 5 installed inside the shock absorber. The damping device is provided with a partition 13. The partition adopts a rectangular structure design with two circular holes. The diameters of the two circular holes are respectively 1 mm to 2 mm and 0.5 mm to 1 mm. The total area of the holes accounts for the entire partition. The percentage of the plate area is 40% to 60%, and the holes of two different diameters are arranged at intervals. The design structure of this partition increases the resistance of the damping fluid passing through the partition, and significantly increases the damping energy dissipation capacity of the damping fluid. .
[0084] attached Figure 4 The mass mechanical model of the shock absorber with double damping frequency modulation is given. It can be seen from the figure that the mass of the shock absorber is determined by the mass M of the body structure of the shock absorber. 1 and the liquid mass M inside the shock absorber f Consists of two parts. The vertical shock absorber damps the viscous damping C generated by the viscous damping fluid inside the shock absorber 0 and the eddy current damping C generated by the permanent magnet pair and the conductor plate due to the cutting magnetic field lines 1 composition. The stiffness of this shock absorber is K. The control force F of the vertical shock absorber to the vertical oscillation of the transmission wire is generally composed of two parts: one part is the inertial force F generated by the movement of the liquid with the structure. 1 , the other part is the viscous force F generated by the liquid itself when it moves 2. According to the dynamic balance principle, the motion differential equations of the variable mass dynamic vibration absorber are:
[0085]
[0086] During the working process of the shock absorber: when the mass of the liquid M f can be from 0 to M fmax The range is adjusted according to the external excitation, so the variable range of the shock absorber mass is M 1 to M1+ M fmax. Therefore, the natural frequency of the shock absorber ω n for:
[0087]
[0088] It can be seen from formula 2: when the mass of the liquid M f from 0 to M fmax When the range changes, the natural frequency of the shock absorber ω n also changes accordingly, the range is arrive Therefore, when the external frequency ω is located at arrive Within the range, the damping fluid mass in the damping fluid device can be adjusted to keep its natural frequency consistent with the external frequency ω, so that the energy dissipation capability of the vertical shock absorber can be maximized. The vertical wind vibration mechanical model of the vertical vibration damping device given in the patent of this invention can be applied to the finite element calculation of the dynamic characteristics of the wire and the vertical vibration damping device. The finite element calculation results of this model can significantly improve the vertical vibration damping. The accuracy of the calculation of the dynamic characteristics of the device, the calculation results and the test results are relatively close.
[0089] It can be seen from the above mechanical model that as long as the quality of the vertical damper liquid is adjusted so that the natural frequency of the shock absorber is consistent with the external frequency, the shock absorber can achieve the best vertical wind vibration damping effect. . In order to measure the damping and natural frequency of the vertical shock absorber, a set of test device is designed in the present invention. The device consists of a vibrating table, a bracket 24, a vertical shock absorber, an acceleration sensor 23, etc. Figure 5 and Image 6 shown.
[0090] attached Figure 5 A test system for the natural frequency of vertical vibration dampers is given. The system consists of a vibration table, a shock absorber connecting bracket, a vertical shock absorber and an acceleration sensor 23 . 27 in the figure is the table top of the vibrating table, which generates a vertical sinusoidal excitation signal, and transmits the excitation signal to the vertical shock absorber through the bracket 24 . 23 is the two acceleration sensors respectively installed on the vertical vibration table and the top of the shock absorber, 26 is the fastening bolt to connect the vertical vibration table, and 24 is the bracket and the vertical shock absorber connected together. The hole placement of the vibrating table is as attached Image 6 shown.
