Self-adaptive negative stiffness device

Abstract

The invention discloses a self-adaptive negative stiffness device, relates to the technical field of structural seismic mitigation and isolation, and aims to solve the technical problems that energy consumption of a current product is related to displacement, the larger the displacement is, the larger the energy consumption is, and the deformation of a damper is limited due to structural bearing capacity control, the self-adaptive negative stiffness device comprises a pin head pipe and a ball screw arranged in the pin head pipe, a roller bearing is installed at one end of the outer edge face of the pin head pipe, a rotary ring is arranged on the outer edge face of the roller bearing, pin head bodies are arranged at the ends, away from each other, of the pin head pipe and the ball screw, a ball nut is installed on the outer edge face of the ball screw in a threaded fit mode, and a transition ring is installed on the outer edge face of the ball nut. According to the energy-dissipating damper, translation mass is converted into rotation inertia moment, the energy-dissipating capacity of the damper is effectively improved, the structural performance can be greatly improved by combining the energy-dissipating damper with the damping technology, and the cost and the construction and maintenance difficulty are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of structural vibration reduction and isolation, and more specifically to an adaptive negative stiffness device. Background Art

[0002] Traditional structures achieve the purpose of earthquake resistance by increasing the cross-section of structural components. In order to further improve the structural safety reserve, scholars have proposed shock-absorbing technology in recent years. It adds displacement or velocity dampers to traditional structures and uses the energy dissipation and shock-absorbing effect of the dampers.

[0003] The energy consumption of the above two products is related to displacement. The greater the displacement, the greater the energy consumption, otherwise it is the opposite. Due to the control of structural bearing capacity, the deformation of the damper is limited, so the effect of shock absorption technology is generally between 10% and 20%, which is limited. In view of this, we propose an adaptive negative stiffness device. Summary of the invention

[0004] The purpose of the present invention is to provide an adaptive negative stiffness device to solve the technical problems that the energy consumption of current products is related to displacement, the greater the displacement, the greater the energy consumption, and the deformation of the damper is limited due to the control of structural bearing capacity.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: an adaptive negative stiffness device, comprising a pin head tube and a ball screw arranged in the pin head tube;

[0006] A roller bearing is installed at one end of the outer edge surface of the pin head tube, and a slewing ring is arranged on the outer edge surface of the roller bearing, and a pin head body is constructed at one end of the pin head tube and the ball screw that are away from each other;

[0007] A ball nut is threadedly mounted on the outer edge surface of the ball screw, a transition ring is mounted on the outer edge surface of the ball nut, and a mass ring for increasing the inertial force is buckled on the transition ring.

[0008] The present invention plays a role in mass amplification by converting the translational mass into the rotational inertia moment. In the process, the ball screw nut generates inertia moment and inertia force. The direction of the inertia force is consistent with the direction of movement, which starts the traction effect and forms an obvious negative stiffness effect. After the negative stiffness effect acts on the structure, it can reduce the stiffness of the structure and play a role in amplifying deformation, thereby effectively improving the energy consumption capacity of the damper, while not changing the bearing capacity of the structure. The device combined with shock absorption technology can greatly improve the structural performance, reduce costs and reduce the difficulty of construction and maintenance.

[0009] Preferably, a plurality of serpentine silky curve recesses are provided in a circular array on the outer edge surface of the ball screw, and a plurality of serpentine silky curve convex keys are provided in a circular structure inside the ball nut, and the serpentine silky curve convex keys cooperate with the serpentine silky curve recesses.

[0010] Preferably, a plurality of round steel balls for reciprocating motion are arranged in a ring shape between the ball nut and the ball screw, and the round steel balls are arranged to roll in the corresponding serpentine silky curve recesses and serpentine silky curve convex keys.

[0011] A design method for an adaptive negative stiffness device, wherein the negative stiffness effect of the device is generated by inertial force, and the negative stiffness principle is as follows:

[0012] S1, parameter calculation;

[0013] Carry out conventional structural design according to structural specifications, and obtain the required negative stiffness effect of the device based on trial calculations;

[0014] S2, determine the rotation frequency;

[0015] According to the structural period, the rotation frequency of the negative stiffness device is determined;

[0016] S3, deformation determination;

[0017] Determine the deformation of the negative stiffness device according to the structural requirements;

[0018] S4, calculation based on negative stiffness principle;

[0019] According to the results obtained in the above process, combined with the building function, the length, moment of inertia and mass of the device are determined. The mass ring (6) transmits the linear motion of the ball screw (8) to the ball screw nut (7) and the rotation angle of the mass ring (6). The relationship between the angle generated by the rotating mass after one rotation and the axial displacement generated by the linear motion of the ball screw (8) is:

[0020]

[0021] Wherein L is the lead of the ball screw (8), and x is the axial displacement of the ball screw (8);

[0022] The inertia moment generated by the ball screw nut (7) is:

[0023]

[0024] Then the axial inertia force generated by the negative stiffness device is:

[0025]

[0026] make:

[0027]

[0028] Then the above formula can be written as:

[0029]

[0030] m e That is, the equivalent mass produced by the negative stiffness device;

[0031] Transforming the above formula yields:

[0032] F 惯性力 =-ω 2 m e x

[0033] Let ω 2 m e =k e (i.e. equivalent stiffness), the above formula can be equivalent to

[0034] F 惯性力 =-k e x

[0035] S5, follow-up work;

[0036] Once confirmed, assembly, testing and debugging can be carried out.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention plays a role in mass amplification by converting the translational mass into the rotational inertia moment. In the process, the ball screw nut generates inertia moment and inertia force. The direction of the inertia force is consistent with the direction of movement, which starts the traction effect and forms an obvious negative stiffness effect. After the negative stiffness effect acts on the structure, it can reduce the stiffness of the structure and play a role in amplifying deformation, thereby effectively improving the energy consumption capacity of the damper, while not changing the bearing capacity of the structure. The device combined with shock absorption technology can greatly improve the structural performance, reduce costs and reduce the difficulty of construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention in a cross-sectional state;

[0040] Figure 2 It is a structural schematic diagram of the mass ring in the present invention;

[0041] Figure 3 It is a schematic diagram of the structure of the ball screw in the present invention;

[0042] Figure 4 It is a schematic diagram of the structure of the ball screw nut in the present invention.

[0043] Description of the numbers in the figure:

[0044] 1. Pin head body; 2. Pin head tube; 3. Roller bearing; 4. Slewing ring; 5. Transition ring; 6. Quality ring; 7. Ball screw nut; 8. Ball screw. DETAILED DESCRIPTION

[0045] Embodiment 1:

[0046] like Figures 1 to 4 As shown, the present invention relates to an adaptive negative stiffness device, comprising a pin head tube 2 and a ball screw 8 arranged in the pin head tube 2;

[0047] A roller bearing 3 is installed on one end of the outer edge of the pin head tube 2, and a slewing ring 4 is arranged on the outer edge of the roller bearing 3. The pin head tube 2 and the end of the ball screw 8 that are away from each other are both constructed with a pin head body 1. A ball screw nut 7 is threadedly installed on the outer edge of the ball screw 8. A transition ring 5 is installed on the outer edge of the ball screw nut 7, and a mass ring 6 for increasing the inertia force is buckled on the transition ring 5. By converting the translational mass into a rotational inertia moment, the mass amplification effect is played. In the process, the ball screw nut 7 generates an inertia moment and an inertia force. The direction of the inertia force is consistent with the direction of movement, which starts the traction effect and forms an obvious negative stiffness effect. After the negative stiffness effect acts on the structure, the stiffness of the structure can be reduced, which plays a role in amplifying deformation, thereby effectively improving the energy consumption capacity of the damper, while at the same time not changing the bearing capacity of the structure. The device combined with the shock absorption technology can greatly improve the structural performance, reduce costs and reduce the difficulty of construction and maintenance.

[0048] In an embodiment of the present invention, a plurality of serpentine curve recesses are provided in an annular array on the outer edge surface of the ball screw 8, and a plurality of serpentine curve keys are provided in an annular structure inside the ball nut 7, and the serpentine curve keys cooperate with the serpentine curve recesses, and a plurality of round steel balls for reciprocating motion are arranged in an annular pattern between the ball nut 7 and the ball screw 8, and the round steel balls are arranged in a rolling pattern in the corresponding serpentine curve recesses and serpentine curve keys, and the plurality of round steel balls rolling between the plurality of serpentine curve recesses and the plurality of serpentine curve keys reduce the friction between the ball nut 7 and the ball screw 8, thereby improving the efficiency of converting the translational mass into rotational inertia moment.

[0049] Embodiment 2:

[0050] As another embodiment of the present invention, a design method of an adaptive negative stiffness device is provided, wherein the negative stiffness effect of the device is generated by inertial force, and the negative stiffness principle is as follows:

[0051] S1, parameter calculation;

[0052] Carry out conventional structural design according to structural specifications, and obtain the required negative stiffness effect of the device based on trial calculations;

[0053] S2, determine the rotation frequency;

[0054] According to the structural period, the rotation frequency of the negative stiffness device is determined;

[0055] S3, deformation determination;

[0056] Determine the deformation of the negative stiffness device according to the structural requirements;

[0057] S4, calculation based on negative stiffness principle;

[0058] According to the results obtained in the above process, combined with the building function, the length, moment of inertia and mass of the device are determined. The mass ring (6) transmits the linear motion of the ball screw (8) to the ball screw nut (7) and the rotation angle of the mass ring (6). The relationship between the angle generated by the rotating mass after one rotation and the axial displacement generated by the linear motion of the ball screw (8) is:

[0059]

[0060] Wherein L is the lead of the ball screw (8), and x is the axial displacement of the ball screw (8);

[0061] The inertia moment generated by the ball screw nut (7) is:

[0062]

[0063] Then the axial inertia force generated by the negative stiffness device is:

[0064]

[0065] make:

[0066]

[0067] Then the above formula can be written as:

[0068]

[0069] m e That is, the equivalent mass produced by the negative stiffness device;

[0070] Transforming the above formula yields:

[0071] F 惯性力 =-ω 2 m e x

[0072] Let ω 2 m e =ke (i.e. equivalent stiffness), the above formula can be equivalent to

[0073] F 惯性力 =-k e x

[0074] S5, follow-up work;

[0075] Once confirmed, assembly, testing and debugging can be carried out.

[0076] Working principle: This embodiment provides an adaptive negative stiffness device. When in use, under the action of external excitation, the mass ring 6 transmits the linear motion of the ball screw 8 to the angle between the ball nut 7 and the mass ring 6, and converts the linear motion into rotational motion, that is, converts the translational mass into rotational inertia moment, thereby playing the role of mass amplification. During the process, the ball nut 7 generates inertia moment and inertia force. The direction of the inertia force is consistent with the direction of motion, which initiates traction and forms an obvious negative stiffness effect. At the same time, it can be used together with the damper to amplify the deformation of the damper and increase the energy consumption effect of the damper.

[0077] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. An adaptive negative stiffness device, characterized in that: It comprises a pin head tube (2) and a ball screw (8) arranged in the pin head tube (2); A roller bearing (3) is installed on one end of the outer edge surface of the pin head tube (2), and a slewing ring (4) is arranged on the outer edge surface of the roller bearing (3); and a pin head body (1) is constructed at the ends of the pin head tube (2) and the ball screw (8) that are away from each other; A ball nut (7) is threadedly mounted on the outer edge surface of the ball screw (8), a transition ring (5) is mounted on the outer edge surface of the ball nut (7), and a mass ring (6) for increasing the inertial force is buckled and arranged on the transition ring (5).

2. An adaptive negative stiffness device according to claim 1, characterized in that: The outer edge surface of the ball screw (8) is provided with a plurality of serpentine silky curve recesses in an annular array, and the ball screw nut (7) is provided with a plurality of serpentine silky curve convex keys in an annular structure, and the serpentine silky curve convex keys cooperate with the serpentine silky curve recesses.

3. An adaptive negative stiffness device according to claim 2, characterized in that: A plurality of round steel balls for reciprocating motion are arranged in a ring shape between the ball nut (7) and the ball screw (8), and the round steel balls are arranged to roll in the corresponding serpentine silky curve recesses and serpentine silky curve convex keys.

4. A method for designing an adaptive negative stiffness device, according to claim 1-3, characterized in that The negative stiffness effect of the device is generated by inertial force, and the negative stiffness principle is as follows: S1, parameter calculation; Carry out conventional structural design according to structural specifications, and obtain the required negative stiffness effect of the device based on trial calculations; S2, determine the rotation frequency; According to the structural period, the rotation frequency of the negative stiffness device is determined; S3, deformation determination; Determine the deformation of the negative stiffness device according to the structural requirements; S4, calculation based on negative stiffness principle; According to the results obtained in the above process, combined with the building function, the length, moment of inertia and mass of the device are determined. The mass ring (6) transmits the linear motion of the ball screw (8) to the ball screw nut (7) and the rotation angle of the mass ring (6). The relationship between the angle generated by the rotating mass after one rotation and the axial displacement generated by the linear motion of the ball screw (8) is: Wherein L is the lead of the ball screw (8), x is the axial displacement of the ball screw (8); the inertia moment generated by the ball screw nut (7) is: Then the axial inertia force generated by the negative stiffness device is: make: Then the above formula can be written as: m e That is, the equivalent mass produced by the negative stiffness device; Transforming the above formula yields: F 惯性力 =-ω 2 m e x Let ω 2 m e =k e (i.e. equivalent stiffness), the above formula can be equivalent to F 惯性力 =-k e x S5, follow-up work; Once confirmed, assembly, testing and debugging can be carried out.

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