CN114483877B - Gravity compensation nonlinear energy trap vibration damper - Google Patents

Gravity compensation nonlinear energy trap vibration damper Download PDF

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CN114483877B
CN114483877B CN202210302786.7A CN202210302786A CN114483877B CN 114483877 B CN114483877 B CN 114483877B CN 202210302786 A CN202210302786 A CN 202210302786A CN 114483877 B CN114483877 B CN 114483877B
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guide rod
mass block
linear spring
top plate
linear
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CN114483877A (en
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魏晓军
戴晓欣
张竞巍
夏冉
何雨晴
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Central South University
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Central South University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The application discloses a gravity compensation nonlinear energy trap vibration damper, which comprises a connecting seat, a guide rod, a mass block, a first linear spring, a second linear spring and a damper; the connecting seat is in an inverted U shape and comprises a top plate and two side plates, the top plate is horizontally arranged, the side plates are oppositely arranged, the guide rod is vertically arranged between the two side plates, the upper end of the guide rod is fixedly connected with the top plate, the lower end of the guide rod penetrates through a center hole in the mass block, the mass block can freely slide along the guide rod, the first linear spring sleeve is arranged on the guide rod, two ends of the first linear spring sleeve are fixedly connected with the top plate and the mass block respectively, the number of the second linear springs is two, the two ends of the second linear spring are fixedly connected with the mass block and the corresponding side plates respectively, and the damper is vertically arranged, and the two ends of the damper are fixedly connected with the top plate and the mass block respectively. The gravity compensation to the oscillator is realized when the oscillator vibrates vertically, pure cubic rigidity can be provided, targeted energy transfer is realized, and the gravity compensation device has the advantages of simple structure, no need of energy input and good robustness.

Description

Gravity compensation nonlinear energy trap vibration damper
Technical Field
The invention relates to the technical field of vibration reduction, in particular to a gravity compensation nonlinear energy trap vibration reduction device.
Background
The vibration problem is widely existed in a plurality of engineering fields such as spaceflight, machinery, civil engineering and the like. For example, in the field of bridge engineering, with the development of the use, construction and design techniques of new materials with light weight and high strength and the improvement of aesthetic sense of buildings, bridge structures tend to be more flexible. The flexible bridge has the characteristic of low structural rigidity, so that the vibration problem of the flexible bridge is obvious (such as wind vibration, man-induced vibration and the like), and the problem of how to ensure the safety and the vibration comfort level of the structure is urgently needed to be solved in the industry. Therefore, it is of great research significance to adopt effective measures for vibration control.
At present, the vibration control theory is mainly divided into passive control, active control and semi-active control. The active control measure and the semi-active control measure both relate to an external energy input process, and the device is high in maintenance cost and general in reliability; in contrast, passive control measures do not require external energy and have the advantages of simple construction, low cost and easy maintenance. Therefore, structurally adding a passive control damping device is currently the most widely used vibration control measure.
A chirped damping device (e.g., TMD) is the most commonly used passive control device at present, but it has a damping effect only in a narrow frequency band around the target modal frequency, and is less robust to frequency variations. The nonlinear energy trap (NES) which has been developed in recent years has a vibration damping effect in a wide frequency band and is highly adaptive. In theory, a classical nonlinear energy trap is generally composed of a mass element, a pure nonlinear stiffness element, and a damping element; however, in practice, when the nonlinear energy trap is applied to the control of the vertical vibration of the structure, the gravity of the mass unit can cause that the pure nonlinear rigidity is difficult to realize, so that the targeted energy transfer of the nonlinear system is difficult to realize, and the vibration reduction effect of the nonlinear energy trap is reduced.
Therefore, the application of theory to the problem that the theory does not achieve the best effect is a problem to be solved urgently in the field.
Disclosure of Invention
An object of the application is to provide a novel nonlinear energy trap vibration damper, solve the vertical vibration control problem of structure among the prior art through the mode of gravity compensation. The technical scheme of the application is as follows:
a gravity compensation nonlinear energy trap vibration damper comprises a connecting seat, a guide rod, a mass block, a first linear spring, a second linear spring and a damper;
the connecting seat comprises a top plate and two side plates, the top plate is horizontally arranged, the two side plates are vertically connected with the lower surface of the top plate, the two side plates are oppositely arranged, and the upper surface of the top plate is fixedly connected with the main structure;
the guide rod is vertically arranged in the middle of the two side plates, and the upper end of the guide rod is fixedly connected with the lower surface of the top plate;
the mass block is provided with a hole in the center and can be movably sleeved on the guide rod;
the first linear spring is sleeved on the guide rod, and two ends of the first linear spring are respectively fixedly connected with the lower surface of the top plate and the upper surface of the mass block;
the two second linear springs are respectively positioned between the two side plates and the guide rod, and two ends of each second linear spring are respectively fixedly connected with the side surface of the mass block and the corresponding side plate;
the damper is vertically arranged, and two ends of the damper are fixedly connected with the lower surface of the top plate and the upper surface of the mass block respectively.
In some specific embodiments, the number of the dampers is two, and the two dampers are symmetrically arranged on two sides of the guide rod.
In some specific embodiments, the number of the dampers is three or more, and the plurality of dampers are uniformly arranged around the guide rod at circumferential intervals.
In some specific embodiments, the sliding gap between the first linear spring and the guide rod is 4mm to 10mm
In some specific embodiments, the sliding gap between the mass and the guide rod is 2mm to 6mm, or the sliding contact surface between the mass and the guide rod is kept smooth.
In some specific embodiments, the second linear spring is in a horizontal state when the mass is at rest. When the mass block moves to the position where the second linear spring is in the horizontal state, the restoring force provided by the first linear spring is equal to the gravity of the mass block, so that gravity compensation is realized.
In some specific embodiments, the parameter settings of the structures in the vibration damping device satisfy the following relations:
Figure BDA0003563472520000021
Figure BDA0003563472520000022
Figure BDA0003563472520000023
in the formula: k is a radical of 1 And k 2 The stiffness coefficients of the first linear spring and the second linear spring, m is the mass of the mass block, g is the gravity constant, and L is 0 The natural length of the second linear spring before deformation, a and h are L 0 Horizontal and vertical components of (c), k NES The pure cubic stiffness that needs to be achieved for a nonlinear energy trap.
In some specific embodiments, two ends of the second linear spring are respectively connected to the mass block and the side plate through lifting lugs, and two ends of the damper are respectively connected to the mass block and the top plate through lifting lugs.
In some specific embodiments, a plurality of bolt holes are formed in the top plate, and the connecting seat is fixedly connected with the main structure through the cooperation of bolts and the bolt holes.
In some specific embodiments, the plurality of bolt holes are symmetrically distributed about the guide bar central axis.
The technical scheme provided by the application has at least the following beneficial effects:
1. the vibration damper provided by the application is a passive control device, needs external energy input, and is simple in structure, low in manufacturing cost, low in maintenance cost and relatively high in system reliability.
2. The vibration damping device provided by the application adopts a nonlinear energy trap principle, only one mode can be controlled compared with a linear frequency modulation vibration damping device, the control effect is particularly sensitive to the change of target mode frequency, and the robustness is poor.
3. The application provides a damping device compares in traditional nonlinear energy trap device, and the invariable gravity of mass unit carries out gravity compensation to the oscillator through setting up first linear spring to the influence of nonlinear stiffness effect when having considered structure vertical vibration, combines the effect of second linear spring simultaneously for nonlinear energy trap has pure cubic rigidity in vertical direction, can realize the targeted energy transfer of system. In addition, this application still sets up the guide arm that runs through first linear spring and oscillator, has injectd reliable and stable motion orbit for the nonlinear energy trap oscillator of solving vertical vibration problem.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that other drawings may be derived from those drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a gravity compensation nonlinear energy trap vibration damping device in an embodiment of the present application;
FIG. 2 is a front view of the connector holder of FIG. 1;
FIG. 3 is a top view of the connecting socket of FIG. 1;
FIG. 4 is a front view of the combination of the mass and guide rod of FIG. 1;
FIG. 5 is a mechanical schematic diagram of the damping device gravity compensation NES of FIG. 1;
FIG. 6 is a view of FIG. 5
Figure BDA0003563472520000031
A mechanical diagram of (a);
in the figure: 1. connecting seat, 11, roof, 12, curb plate, 13, bolt hole, 2, guide arm, 3, quality piece, 4, first linear spring, 5, second linear spring, 6, attenuator, 7, lug.
Detailed Description
In order to facilitate understanding of the present application, the technical solutions in the present application will be described more fully and more specifically with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present application is not limited to the specific embodiments below, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.
It will be understood that when an element is referred to as being "attached" to, secured to, connected to or communicating with another element, it can be directly attached to, secured to, connected to or communicating with the other element or indirectly attached to, secured to, connected to or communicating with the other element through other intervening elements.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application.
Examples
Referring to fig. 1-4, a gravity compensation nonlinear energy trap vibration damper comprises a connecting seat 1, a guide rod 2, a mass block 3, a first linear spring 4, a second linear spring 5 and a damper 6.
The connecting socket 1 includes a top plate 11 and a side plate 12. The roof 11 sets up horizontally, the quantity of curb plate 12 is two and sets up in the both sides of roof 11 relatively, specifically does curb plate 12 sets up vertically and its upper edge is connected with the lower surface of roof 11 is perpendicular. The top plate 11 and the side plate 12 form an inverted U-shaped structure.
The guide rod 2 is vertically arranged and is positioned in the middle of the two side plates 12, and the upper end of the guide rod 2 is fixedly connected with the lower surface of the top plate 11. The rigid frame of the gravity compensation nonlinear energy trap vibration damper in the application is formed by the connecting seat 1 and the guide rod 2.
The mass block 3 can be movably sleeved on the guide rod 2. Specifically, the center of the mass block 3 is provided with a hole, and the lower end of the guide rod 2 passes through the center hole of the mass block 3.
In this embodiment, the guide rod 2 is cylindrical, and the central hole of the mass 3 is a circular hole with a diameter larger than that of the rod.
In order to avoid that the friction between the mass 3 and the guide rod 2 affects the whole damping system, the sliding surface of the mass 3 and the outer surface of the guide rod 2 should be kept smooth, and the friction coefficient between the two is set small enough to be negligible, and the mass 3 can freely slide up and down along the guide rod 2. Or a gap with a certain width is arranged between the mass block 3 and the guide rod 2, such as 2 mm-6 mm, so that the friction resistance generated by the contact of the mass block 3 and the guide rod 2 is avoided, and at the moment, the sliding surface of the mass block 3 and the outer surface of the guide rod 2 also keep smooth, so that the friction resistance generated by the careless contact of the mass block 3 and the guide rod 2 during relative movement is avoided.
The first linear spring 4 is vertically arranged and surrounds the outer side of the guide rod 2, the upper end of the first linear spring 4 is fixedly connected with the lower surface of the top plate 11, and the lower end of the first linear spring 4 is fixedly connected with the upper surface of the mass block 3.
The length of the guide rod 2 needs to be designed according to the maximum amplitude of the mass block 3, namely when the mass block 3 moves to the position of the maximum amplitude at the lower part, the mass block does not reach the bottommost end of the guide rod 2, so that the mass block 3 is prevented from being separated from the guide rod 2, and the motion track of the mass block 3 is ensured to be always restricted by the guide rod 2. In addition, the guide bar 2 cannot be too thin, and the cross-sectional area of the guide bar 2 must be ensured by the length of the guide bar to ensure that the guide bar 2 has sufficient rigidity.
A certain gap is formed between the inner surface of the first linear spring 4 and the outer surface of the guide rod 2, so that the contact between the inner surface and the outer surface is prevented from interfering the free expansion and contraction of the first linear spring 4. The width of the gap is 4mm to 10mm.
The number of the second linear springs 5 is two and the second linear springs are respectively positioned between the two side plates 12 and the guide rod 2. For each second linear spring 5, its two ends are fixedly connected to the side of the mass 3 and the corresponding side plate 12, respectively.
The damper 6 is vertically arranged between the top plate 11 and the mass block 3, and the upper end and the lower end of the damper are respectively fixedly connected with the lower surface of the top plate 11 and the upper surface of the mass block 3.
In this embodiment, the number of the dampers 6 is two, and the two dampers 6 are symmetrically arranged on the left and right sides of the guide bar 2. In other embodiments, the number of dampers 6 may be three or more, and in this case, a plurality of dampers 6 are arranged circumferentially at regular intervals around the guide rod 2.
It is further preferred that the damper 6 in this embodiment is a viscous damper, which provides only additional damping to the system and no additional stiffness.
Under the action of vertical dynamic load, the up-and-down vibration of the mass block 3 drives the damper 6 to stretch and compress, for a viscous damper, the movement of a piston in a cylinder barrel is driven, and viscous materials flow to provide damping; appropriate additional damping creates advantages for the nonlinear energy trap to achieve targeted energy transfer.
In this embodiment, the two ends of the second linear spring 5 are respectively connected to the mass block 3 and the side plate 12 through the lifting lugs 7, and the two ends of the damper 6 are respectively connected to the mass block 3 and the top plate 11 through the lifting lugs 7. In other embodiments, other types of attachment structures besides ears may be used.
The damping device is arranged at the bottom of the main structure, specifically, a plurality of bolt holes 13 are formed in a top plate 11 of the connecting base 1, and the connecting base 1 is fixedly connected with the main structure through the matching of bolts and the bolt holes 13.
In order to ensure uniform stress and stable connection, a plurality of bolt holes 13 are distributed on the top plate 11 symmetrically about the central axis of the guide rod 2.
Further referring to fig. 5, a mechanical diagram of a gravity compensated nonlinear energy trap is shown. In the figure:
m is the mass of the mass block 3, g is the gravity constant, and c is the damping coefficient;
the dashed box represents the initial position of the mass 3, when none of the springs is deformed (gravity of the mass is not taken into account);
the solid box represents the actual position of the mass 3 after deformation (taking into account the weight of the mass);
y is the distance between the geometric centers of the two positions;
L 0 is a secondThe natural length of the linear spring 5 before deformation, a and h are L respectively 0 A horizontal component and a vertical component of;
k 1 is the stiffness coefficient, k, of the first linear spring 4 2 Is the stiffness coefficient of the second linear spring 5;
k NES the pure cubic stiffness that needs to be achieved to set the nonlinear energy trap.
The vertical restoring force generated by the first linear spring 4 is:
F 1 ＝k 1 y (1)
the restoring force in the vertical direction generated by the second linear spring 5 is:
Figure BDA0003563472520000061
total vertical restoring force F generated by each spring in NES system s Comprises the following steps:
Figure BDA0003563472520000062
setting up
Figure BDA0003563472520000063
Bringing into the above formula (3) gives:
Figure BDA0003563472520000064
in that
Figure BDA0003563472520000065
Taylor expansion is performed on the above formula (4), see formula (5), wherein o (a) represents the higher order infinitesimal of the parameter a in parentheses. At this point, the second linear spring 5 is in a horizontal position and in a compressed state, the geometrical relationship of which is shown in fig. 6.
Figure BDA0003563472520000066
The total restoring force of the spring in the vertical direction can be approximated by:
Figure BDA0003563472520000067
to achieve a constant pure cubic stiffness for the spring system of NES, the linear stiffness term in equation (6) above needs to be zero, i.e.:
Figure BDA0003563472520000068
in addition, to ensure the mass of NES in
Figure BDA0003563472520000069
The mass block should be located at the static state of the system when the system vibrates up and down
Figure BDA00035634725200000610
At the point (the tilt spring is kept in a horizontal state), the restoring force satisfies the relationship of the following expression (8).
Figure BDA00035634725200000611
I.e. is>
Figure BDA00035634725200000612
In summary, the pure cubic stiffness of the nonlinear energy trap is:
Figure BDA0003563472520000071
i.e. is>
Figure BDA0003563472520000072
The geometrical position relationship of each linear spring and each mass block for realizing the gravity compensation NES can be obtained through the derivation, and the relations among the parameters of the stiffness of each linear spring, the gravity of each mass block and the like are determined by the equations (7), (8) and (9).
According to the above, when the vibration damper provided by the invention works, the mass block 3 moves up and down along the guide rod 2 under the action of vertical dynamic load, and then drives the first linear spring 4 and the second linear spring 5 to generate elastic deformation, and the arrangement and combination mode of the springs enables the generated elastic restoring force to be a pure cubic function of displacement, namely the nonlinear energy trap has pure cubic stiffness in the vertical direction, so that favorable conditions are created for realizing targeted energy transfer of the nonlinear energy trap in an ideal state.
In conclusion, the gravity compensation nonlinear energy trap vibration damping device limits a stable and reliable motion track for the mass block 3 of the nonlinear energy trap by arranging the fixed guide rod 2; by arranging the combination of the vertical spring and the inclined spring, the gravity compensation and the pure cubic stiffness of the nonlinear energy trap for solving the vertical vibration problem are realized; in addition, through the introduction of proper additional damping, the combined system of the main structure and the vibration damping device can realize targeted energy transfer, and a high-efficiency vibration control effect is achieved. The invention effectively overcomes the defects of the prior art and has great practical value.
The above description is only a few examples of the present application and does not limit the scope of the present application, and it is obvious to those skilled in the art that various modifications and changes may be made in the present application. Any improvement or equivalent replacement directly or indirectly applicable to other related technical fields within the spirit and principle of the present application by using the contents of the specification and the drawings of the present application shall be included in the protection scope of the present application.

Claims (8)

1. A gravity compensation nonlinear energy trap vibration damper is characterized by comprising a connecting seat (1), a guide rod (2), a mass block (3), a first linear spring (4), a second linear spring (5) and a damper (6);
the connecting seat (1) comprises a top plate (11) which is horizontally arranged and two side plates (12) which are vertically connected with the lower surface of the top plate (11), the two side plates (12) are oppositely arranged, and the upper surface of the top plate (11) is fixedly connected with a main structure;
the guide rod (2) is vertically arranged in the middle of the two side plates (12), and the upper end of the guide rod (2) is fixedly connected with the lower surface of the top plate (11);
the center of the mass block (3) is provided with a hole and the mass block can be movably sleeved on the guide rod (2);
the first linear spring (4) is sleeved on the guide rod (2), and two ends of the first linear spring are fixedly connected with the lower surface of the top plate (11) and the upper surface of the mass block (3) respectively;
the number of the second linear springs (5) is two, the second linear springs are respectively located between the two side plates (12) and the guide rod (2), two ends of each second linear spring (5) are respectively and fixedly connected with the side face of the mass block (3) and the corresponding side plate (12), and when the mass block (3) is static, the second linear springs (5) are in a horizontal state;
the damper (6) is vertically arranged, and two ends of the damper are respectively fixedly connected with the lower surface of the top plate (11) and the upper surface of the mass block (3) through lifting lugs (7);
the parameter setting of each structure in the vibration damping device meets the following relational expression:
Figure FDA0004054450630000011
Figure FDA0004054450630000012
Figure FDA0004054450630000013
in the formula: k is a radical of 1 And k 2 The stiffness coefficients of the first linear spring and the second linear spring, m is the mass of the mass block, g is the gravity constant, and L is 0 The natural length of the second linear spring before deformation, a and h are L 0 Horizontal and vertical components of (c), k NES Pure cubic stiffness for nonlinear energy traps。
2. The gravity compensated non-linear energy trap vibration damping device according to claim 1, characterized in that the number of dampers (6) is two, and two dampers (6) are symmetrically arranged on both sides of the guide rod (2).
3. The gravity compensated nonlinear energy trap vibration damping device according to claim 1, wherein the number of the dampers (6) is three or more, and a plurality of the dampers (6) are circumferentially and uniformly arranged around the guide rod (2) at intervals.
4. The gravity compensated nonlinear energy trap vibration damping device according to claim 1, wherein a sliding gap between the first linear spring (4) and the guide rod (2) is 4mm to 10mm.
5. The gravity compensated nonlinear energy trap vibration damping device according to claim 1, wherein a sliding gap between the mass (3) and the guide rod (2) is 2mm to 6mm, or a sliding contact surface between the mass (3) and the guide rod (2) is kept smooth.
6. The gravity compensated non-linear energy trap vibration damper according to claim 1, characterized in that the second linear spring (5) is connected at both ends to the mass (3) and the side plates (12) via lifting lugs (7), respectively.
7. The gravity compensation nonlinear energy trap vibration damper according to claim 1, wherein a plurality of bolt holes (13) are arranged on the top plate (11), and the connecting seat (1) is fixedly connected with a main structure through the matching of bolts and the bolt holes (13).
8. The gravity compensated non-linear energy trap damping device according to claim 7, characterized in that a plurality of bolt holes (13) are distributed symmetrically about the guide bar (2) central axis.
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