One-way outputting inertial damper

Abstract

The application relates to a one-way output inertial container, belonging to the field of civil engineering structure vibration reduction and isolation, comprising a supporting rod, a bidirectional reciprocating wire rod pair, a force arm, a steel rope fixing point, a support, a steel rope, a lower cross beam, a mass block and a base. The force arm, the support and the lower cross beam form a frame, which is connected with a main structure to be reduced and isolated as an upper output end of force; the bottom of the supporting rod is connected with the base or foundation as a lower output end of force; the steel rope converts the axial movement of the two end points into the rotary movement of the supporting rod and the mass block, and realizes the one-way pressure or tension output. The structure has the advantages of simple structure, reliable work, flexible adjustment, strong adaptability and the like, and can be widely applied to the fields of bridges, high-rise buildings, earthquake isolation systems, large machines and the like, so as to improve the vibration reduction and isolation effect and the safety performance of the structure.

Description

Technical Field

[0001] This disclosure pertains to the field of vibration reduction and isolation in civil engineering structures, specifically relating to a unidirectional inertial container. Background Technology

[0002] A unidirectional force-bearing element can be understood as an element that generates force in only one direction during the reciprocating motion of a structure in both forward and reverse directions. As fundamental mechanical elements, unidirectional mass or inertial elements are currently less commonly reported. A common inertial container is a typical inertial mechanical element, encompassing various implementations, such as typical ball screw inertial containers, rack and pinion inertial containers, and other types of inertial containers that provide inertial effects based on flywheel rotation. The force at the two ends of a common inertial container is proportional to the relative acceleration between the two ends, and the direction of the force can be both positive and negative within a working cycle, making it a bidirectional inertial mechanical element. For inertial containers that provide inertial effects based on flywheel rotation, from an energy perspective, in the first half of the cycle, the dynamic potential energy of the structure's vibration is converted into the dynamic potential energy of the flywheel's rotation; in the second half of the cycle, the dynamic potential energy of the flywheel's rotation is converted back into the dynamic potential energy of the structure. If damping is not considered or is weak, energy is transferred back and forth between the structure and the flywheel without dissipation. This mechanism limits the vibration reduction effect of the inertial container. Building upon conventional inertia containers, articles such as "Experimental and numerical assessment of the seismic response of steel structures with clutched inerters" and "Seismic Protection of Structures with Supplemental Rotational Inertia" report a unidirectional inertia container that utilizes a ratchet clutch mechanism combined with a ball screw mechanism to achieve unidirectional flywheel rotation and unidirectional force output at both ends; this is referred to as a "clutch inerter" in the original text. Within one vibration cycle of the structure, when the structure moves forward, the flywheel is driven to rotate in a certain direction, generating inertial forces at both ends. When the structure moves in the opposite direction, due to the presence of the ratchet clutch, no reverse driving force is generated on the flywheel, and the flywheel continues to rotate in its original direction, with no inertial forces generated at the two ends. These documents demonstrate that this unidirectional inertia container based on a ratchet clutch mechanism contributes to better vibration reduction effects for building structures or other engineering structures.

[0003] However, there are currently few ways to implement unidirectional inertial capacity. The reported unidirectional inertial capacity based on ratchet clutch mechanism still has shortcomings. For example, the mechanical backlash of the ratchet clutch gear will cause the force of the unidirectional inertial capacity to have collision force, and the ratchet clutch is prone to wear.

[0004] Based on the above background, a novel unidirectional inertial container based on the unidirectional tension characteristic of rope is proposed, providing a new technical solution for vibration reduction and isolation engineering. It can satisfy the requirement that vibration energy is unidirectionally transferred from the main structure to the inertial body of the unidirectional inertial container within one vibration cycle of the structure, becoming the rotational mechanical energy of the inertial body, and then dissipated by the damping mechanism. It also avoids mechanical clearance and mechanical wear, and has the potential to be simple in structure, low in cost, reliable and durable. Summary of the Invention

[0005] The purpose of this disclosure is to provide a unidirectional output inertial container based on the unidirectional tension characteristic of a rope, providing a new technical solution for vibration reduction and isolation engineering.

[0006] The objective of this disclosure can be achieved through the following technical solutions:

[0007] A unidirectional output inertial container, the inertial container comprising;

[0008] The support rod, located at the center of the device, is responsible for connecting other components. The upper section of the support rod is equipped with a bidirectional reciprocating lead screw pair.

[0009] A bidirectional reciprocating screw assembly, including a bidirectional reciprocating screw, is used to change the direction of force;

[0010] The mass block, connected to the lower end of the support rod, participates in the rotational motion;

[0011] Steel rope fixing points are set on the support rods to fix the steel ropes;

[0012] The frame, connected to the support rods, bears the pressure.

[0013] Steel rope: Connects the steel rope fixing point to the frame, transmitting and converting force.

[0014] Furthermore, the frame includes a lever arm, a support, and a lower crossbeam. A circular hole with a diameter larger than that of the support rod is opened at the center of the lever arm and the lower crossbeam. The support rod passes through the lever arm and the lower crossbeam and rotates within the circular hole. The lever arm and the lower crossbeam are symmetrical shapes such as beam-like or disc-like. The two ends of the support are fixedly connected to the lever arm and the lower crossbeam, respectively.

[0015] Furthermore, the bidirectional reciprocating screw has forward and reverse spiral threads with equal pitch, opposite direction, and intertwined. The forward and reverse spiral threads are broken at the upper part of the screw to form a turning zone, and connected at the lower part of the screw to form a thread changing zone.

[0016] Furthermore, the upper end of the bidirectional reciprocating lead screw is provided with a lead screw cap, which is cylindrical and unthreaded. Its upper part is welded to the center of the lever arm, and it has an opening inside with the same diameter as the opening diameter of the lever arm. Its side has a small hole for placing a pin.

[0017] The head of the pin is embedded in the screw cap and can rotate. Its tail is plate-shaped and its thickness is less than the thread width.

[0018] Furthermore, the shape of the mass block is symmetrical about the center of the support rod.

[0019] Furthermore, the number of steel ropes is two or more, and the steel ropes are symmetrically distributed around the center of the support rod.

[0020] Furthermore, during installation, multiple steel ropes are fixed together at one end to a steel rope fixing point on the support shaft, rotated and wound around the support rod in the same direction, tightened, and the rope ends are led out and fixed to steel rope fixing points on the lower crossbeam respectively.

[0021] Furthermore, the base includes a base shell, base balls, and an inner base disk. The base shell includes an inner base shell stop, a rolling groove, and an outer base shell stop. The inner base disk has rolling grooves on both its upper and lower surfaces, forming a cavity with the rolling grooves, in which the base balls roll.

[0022] Furthermore, the frame is slidably mounted on top, and the frame moves up and down with the vibration of the main structure.

[0023] Furthermore, the lower part of the support rod is fixedly connected to the inner disk of the base, and the support rod and the mass block rotate together around the axis, with the support rod and the mass block being axially fixed.

[0024] The beneficial effects of this disclosure are:

[0025] Based on the unidirectional tension characteristic of ropes, this invention designs a unidirectional inertial container for structural vibration reduction. The main structure vibrates in both positive and negative directions and drives the mass block to rotate unidirectionally in one direction, realizing unidirectional inertial capacity output. The vibration mechanical energy of the main structure is unidirectionally transmitted and converted into the vibration mechanical energy of the mass block, effectively reducing the vibration response of the main structure by exerting dynamic vibration absorption.

[0026] Compared with unidirectional inertial containers based on ratchet clutch mechanisms, this invention avoids mechanical backlash and mechanical wear, and has the potential to be simple in structure, low in cost, reliable and durable.

[0027] This invention utilizes the synergistic effect of steel rope and bidirectional reciprocating screw pair to realize a "translational-rotational conversion mechanism", which converts the axial motion of the two ends into the rotational motion of the support rod and the mass block, simplifying the structural design and reducing the weight and cost of the structure;

[0028] The present invention adopts a base ball bearing design, which allows the support rod and mass block to rotate at high speed around the axis in both directions without transmitting horizontal torque, thus ensuring the installation and stability of the structure.

[0029] This invention has the advantages of simple structure, reliable operation, flexible adjustment and strong adaptability. It can be widely used in bridges, high-rise buildings, seismic isolation systems, large machinery and other fields to improve the vibration reduction and isolation effect and safety performance of the structure.

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this disclosure;

[0032] Figure 2 This is a partial structural schematic diagram of a bidirectional reciprocating lead screw assembly according to an embodiment of this disclosure;

[0033] Figure 3 This is a partial force diagram of a bidirectional reciprocating lead screw assembly according to an embodiment of this disclosure;

[0034] Figure 4 This is a schematic diagram of the loading curve of an embodiment of this disclosure;

[0035] Figure 5 This is a schematic diagram of the initial state of an embodiment of this disclosure;

[0036] Figure 6 This is a schematic diagram of the preparation stage of an embodiment of this disclosure;

[0037] Figure 7 This is a schematic diagram of the first working state of an embodiment of this disclosure;

[0038] Figure 8 This is a schematic diagram of the second working state of an embodiment of this disclosure;

[0039] Figure 9 This is a schematic diagram of the working state III of an embodiment of this disclosure;

[0040] Figure 10 This is a schematic diagram of the movement of the pin in the turning area according to an embodiment of this disclosure;

[0041] Figure 11 This is a schematic diagram of the movement of the pin in the thread-changing area according to an embodiment of the present disclosure;

[0042] Figure 12 This is a schematic diagram of a partial structure of the base according to an embodiment of this disclosure;

[0043] Figure 13 This is a schematic diagram of a unidirectional tensile inertial compressive structure according to an embodiment of this disclosure; Detailed Implementation

[0044] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0045] Example 1: As Figures 1-12 As shown, a unidirectional output inertia container includes: a support rod 100, a bidirectional reciprocating screw pair 200, a lever arm 300, a steel rope fixing point 400, a bracket 500, a steel rope 600, a lower crossbeam 700, a mass block 800, and a base 1000. This unidirectional output inertia container is a two-end-point output structure. The upper output end of the force is a frame formed by the lever arm 300, the bracket 500, and the lower crossbeam 700, while the lower output end is the bottom of the base 1000. In use, the upper end is connected to the main structure to be vibration-damped and moves up and down with the vibration of the main structure, while the lower end is connected to the base 1000 and does not undergo axial movement. A unidirectional inertial container that only bears pressure, i.e. only outputs pressure to the outside, can achieve a "translational-rotational conversion mechanism" through the synergistic action of steel rope 600 and bidirectional reciprocating screw pair 200, converting the axial motion of the two ends into the rotational motion of support rod 100 and mass block 800. It has a unidirectional inertial container property and can be used for structural vibration reduction and isolation.

[0046] The bidirectional reciprocating lead screw assembly 200 includes: a bidirectional reciprocating lead screw 210, a lead screw cap 220, a pin 230, a forward-rotating lead screw 240, and a reverse-rotating lead screw 250. The bidirectional reciprocating lead screw 210 is located on the upper part of the support rod 100 and is a part of the support rod 100. It has forward-rotating and reverse-rotating lead screws 240 and 250 with equal pitch, opposite directions, and interlacing. The angle of the forward-rotating lead screw 240... +θ The angle of the anti-rotating wire -θ The forward-rotating wire 240 and the reverse-rotating wire 250 are disconnected at the upper part of the lead screw, which is called the turning zone 260. They are connected at the lower part of the lead screw, which is called the wire-changing zone 270. The lead screw cap 220 is cylindrical and unthreaded. Its upper part is welded to the center of the lever arm 300. It has an opening inside with a diameter consistent with the opening diameter of the lever arm 300. It has a small hole on its side for placing a pin 230. The pin 230 is nail-shaped, and its head is embedded in the lead screw cap 230. It can rotate, and the rotation angle range is ( -θ,+θ Its tail is plate-shaped, and its thickness is slightly less than the thread width. Its width is appropriate to ensure successful thread changing in the thread changing zone 270, and its length is appropriate to ensure that it can reach the bottom of the thread.

[0047] The support rod 100 has a bidirectional reciprocating lead screw pair 200 at its upper part, and a mass block 800 is fixedly connected to the lower part of the support rod 100. The mass block 800 can be disc-shaped or any other shape that is symmetrical about the center of the support rod 100. The lower end of the support rod 100 is fixedly connected to the base 1000.

[0048] The lever arm 300, support 500, and lower crossbeam 700 are fixed together to form a frame structure, which serves as a force input end. A circular hole, slightly larger than the diameter of the support rod 100, is located at the center of both the lever arm 300 and the lower crossbeam 700. The support rod 100 passes through the lever arm 300 and the lower crossbeam 700 and rotates within the circular hole. The lever arm 300 and the lower crossbeam 700 can be symmetrical shapes such as beams or discs.

[0049] The steel ropes 600 are a crucial force-transmitting component. They can be made of steel or other rigid materials, and the number can be two or another even number, ensuring symmetrical distribution around the center of the support rod 100. In this case, the lower crossbeam corresponds to a circular or disc-shaped structure. Two steel ropes 600 are fixed at one end to a steel rope fixing point 400 on the support rod 100, rotating and winding around the support rod 100 in the same direction, taut, with the rope ends extended and fixed to steel rope fixing points 400 on the lower crossbeam 700 respectively. During operation, the lever arm 300 is compressed, and the steel ropes 600 bear tension but not compression. The horizontal component of the tension within the ropes forms a torque about the support rod 100, driving the support rod 100 and the mass block 800 to rotate. The term "positive rotation" refers to... Figure 2 " " indicates that the direction of its movement or winding is rotated counterclockwise around the axis from a top-down perspective; "counter-rotation" is the opposite.

[0050] In one embodiment, a pressure is provided on the lever arm. F Support rod 100mm diameter R The angle between the steel rope 600 and the horizontal direction γ The tension on the rigid rope is 600. T and the moment of force about the support rod 100 M They are respectively:

[0051] (1)

[0052] (2)

[0053] The base 1000 as described Figure 12As shown, it includes a base shell 1001, base balls 1002, and an inner base disk 1003; the base shell 1001 includes an inner base stop 10011, a rolling groove 10012, and an outer base stop 10013; the inner base disk 1003 has a second rolling groove 10031 on both its upper and lower surfaces, and the second rolling groove 10031 and the rolling groove 10012 form a cavity in which the base balls 1002 roll.

[0054] Its beneficial effects are as follows: the support rod 100 and the mass block 800 rotate at high speed in both directions around the axis, while the foundation is generally fixed. Through the connection of the base, the support rod 100 is fixedly connected to the inner disk 1003 of the base, and the foundation is fixedly connected to the base shell 1001. In this way, the base 1000 only transmits axial force and not horizontal torque, which can ensure the installation in the engineering application of "a unidirectional output inertial container".

[0055] The frame section can move up and down with the vibration of the main structure but cannot rotate. The lower part of the support rod 100 is fixedly connected to the inner disk 1003 of the base 1000, and can rotate around the axis together with the mass block 800 but cannot move up and down.

[0056] The working mode of the "unidirectional output inertial container" can be described through a specific embodiment:

[0057] It is divided into a preparation phase and a working phase.

[0058] Force exerted by the main structure on the lever arm F Preparation phase F = F 0 For tension, F represents the working phase; for compression, F represents the working phase. Analyze one load cycle to find its minimum value. F 1 maximum value F 2 ,like Figure 4 As shown.

[0059] At time t=0:

[0060] Initially, the steel cable 600 is in a slack state. The frame is at its lowest position, and the pin 230 is located at the bottom of the spiral wire, assuming it is on the forward spiral wire 240.

[0061] Time period from 0 to t1:

[0062] Preparation stage F=F 0 represents tension. The frame is gradually pulled up, and pin 230 moves upward along the spiral wire 240 until it reaches the turning point 260 at the very top of the spiral wire 240. During this process, support rod 100 rotates in the opposite direction, and steel rope 600 is wound around support rod 100 in the spiral direction. Preparation complete.

[0063] The time period t1 to t2:

[0064] Work in Phase I. F For pressure, from F1 Increase to F2 The frame is gradually lowered, and the pin 230 moves down from the turning area 260 at the top of the spiral wire 240 to the wire changing area 270 at the bottom of the spiral wire 240. During this process, the steel rope 600 is taut, and the horizontal component of the tension in the rope forms a torque on the support rod 100. M Counterclockwise rotation, with the positive direction, drives the support rod 100 and mass block 800 to rotate clockwise, gradually unwinding the wound steel rope 600. (Angle) γ Gradually increase, rope tension T and couple moment M Gradually decreases, rotational angular acceleration α Gradually decrease, rotational angular velocity ω It undergoes accelerated rotational motion with gradually decreasing angular acceleration.

[0065] Time t2:

[0066] Working in Phase II. F For pressure, F=F2 The frame is at its lowest position, with pin 230 located at the bottom of the wire changing area of ​​the forward-rotating wire 240. From the forward-rotating wire 240, the wire enters the reverse-rotating wire 250, the steel rope is taut, and the angle is... γ Maximum, rope tension T and couple moment M Minimum, rotation plus angle α Minimum, rotational angular velocity ω maximum..

[0067] The time period from t2 to t3:

[0068] Work status III. F For pressure, from F2 Reduce to F1 Due to the inertia of the mass block, the support rod 100 and the mass block 800 continue to rotate clockwise, and the previously untied steel rope 600 wraps around the support rod 100 again in the opposite direction of rotation. The direction of rotation is the same as the moment of force. M The frame decelerates in the opposite direction until it stops. During this process, the frame is pulled up, and pin 230 is passively moved upward along the counter-rotating wire 250, with the included angle... γ Gradually decrease, rope tension T and couple moment M It gradually increases in size, undergoes a decelerating rotational motion with gradually increasing angular acceleration until it stops at the highest position, preparing for the downward pressure of the next cycle.

[0069] Throughout the entire process of sinusoidal pressure action, the working state of a unidirectional output inertial container is a cycle of "Ⅰ-Ⅱ-Ⅲ;Ⅲ-Ⅱ-Ⅰ".

[0070] Example 2: There are many ways to realize a unidirectional output inertial container using a rope. This example discloses one type of unidirectional pressure inertial container. Other similar unidirectional pressure inertial containers can also be realized by changing the structural form.

[0071] like Figure 13 As shown, in some embodiments, the specific implementation can be a unidirectional tension inertial container, which differs from the above embodiment 1 in that the connection point between the frame and the steel rope is located above the steel rope fixing point on the support rod. The principle and process are the same as in embodiment 1.

[0072] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A unidirectional output inertial container, characterized in that, The inertial container includes; The support rod, located at the center of the device, is responsible for connecting other components. The upper section of the support rod is equipped with a bidirectional reciprocating lead screw pair. A bidirectional reciprocating screw assembly, including a bidirectional reciprocating screw, is used to change the direction of force; The mass block, connected to the lower end of the support rod, participates in the rotational motion; Steel rope fixing points are set on the support rods to fix the steel ropes; The frame, connected to the support rods, bears the pressure. Steel rope: connects the steel rope fixing point to the frame, and transmits and converts force; The base is used to mount the support rods; The bidirectional reciprocating screw has positive and negative spiral wires with equal pitch, opposite direction, and intertwined. The positive and negative spiral wires are broken at the upper part of the screw to form a turning zone, and connected at the lower part of the screw to form a wire changing zone. The base includes a base shell, base balls, and an inner base disk. The base shell includes an inner base shell stop, a rolling groove, and an outer base shell stop. The inner base disk has rolling grooves on both its upper and lower surfaces, forming a cavity with the rolling grooves, in which the base balls roll. The lower part of the support rod is fixedly connected to the inner disk of the base. The support rod and the mass block rotate together around the axis, and the support rod and the mass block are axially fixed.

2. The unidirectional output inertial container according to claim 1, characterized in that, The frame includes a lever arm, a support, and a lower crossbeam. A circular hole with a diameter larger than that of the support rod is opened at the center of the lever arm and the lower crossbeam. The support rod passes through the lever arm and the lower crossbeam and rotates within the circular hole. The lever arm and the lower crossbeam are symmetrical shapes such as beams or discs. The two ends of the support are fixedly connected to the lever arm and the lower crossbeam, respectively.

3. A unidirectional output inertial container according to claim 2, characterized in that, The upper end of the bidirectional reciprocating lead screw is provided with a lead screw cap, which is cylindrical and unthreaded. Its upper part is welded to the middle of the lever arm, and it has an opening inside with the same diameter as the opening of the lever arm. Its side has a small hole for placing a pin. The head of the pin is embedded in the screw cap and can rotate. Its tail is plate-shaped and its thickness is less than the thread width.

4. A unidirectional output inertial container according to claim 2, characterized in that, The shape of the mass block is symmetrical about the center of the support rod.

5. A unidirectional output inertial container according to claim 1, characterized in that, The number of steel ropes is an even number of pairs, and the steel ropes are symmetrically distributed around the center of the support rod.

6. A unidirectional output inertial container according to claim 2, characterized in that, During installation, multiple steel ropes are fixed together at one end to a steel rope fixing point on the support shaft, rotated and wound around the support rod in the same direction, tightened, and the rope ends are led out and fixed to steel rope fixing points on the lower crossbeam respectively.

7. A unidirectional output inertial container according to claim 2, characterized in that, The frame is slidably mounted on the support rod, and moves up and down with the vibration of the main structure.

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