Hydraulic Maxwell inertial damper

Abstract

The invention discloses a hydraulic Maxwell inertial damper, which belongs to the technical field of shock (vibration) reduction, and comprises an inertial mechanism and a Maxwell damping mechanism, and the inertial mechanism is fixed on one side of the Maxwell damping mechanism; the inertial mechanism comprises a hydraulic driving device and a flywheel, and the flywheel is connected to an output shaft of the hydraulic driving device; the hydraulic driving device is communicated with an inner cavity of the Maxwell damping mechanism; when the damper generates displacement under the action of an external load, the hydraulic medium in the cavity flows into the hydraulic driving device and drives the output shaft to rotate, so that the flywheel is driven to rotate. The characteristic that the equivalent coefficient of the Maxwell unit changes along with the vibration frequency and the quasi-negative stiffness characteristic of the inertial unit are combined, so that the damper has the self-adaptive characteristic to a certain degree, and the damper has a large application prospect in vibration control of various structures. Meanwhile, the hydraulic drive type inertial mass unit is adopted, and the defects that a traditional ball screw inertial mass unit is large in friction force, fragile in structure, high in manufacturing cost, difficult to maintain and the like are overcome.

Description

Technical Field

[0001] The invention belongs to the technical field of shock (vibration) reduction, and more specifically, relates to a hydraulic Maxwell inertial damper. Background Art

[0002] As an important load-bearing component of a cable-stayed bridge, the cable has the characteristics of high flexibility and low inherent damping ratio. It is easy to produce large-amplitude wind-rain-induced vibration under wind and rain excitation or high-frequency vortex-induced resonance under high wind speed. These vibrations can easily cause great damage to the cable itself and the connection between the cable and the bridge deck or the end, thus threatening the safety of the bridge structure. In order to suppress the multi-modal vibration of the cable, the designer often uses the method of adding an external damper to directly increase the modal damping ratio of the cable, which is a commonly used method in cable vibration reduction measures.

[0003] Research shows that in order to achieve better vibration reduction control effects, the low-frequency modes of the cable require greater damping, while the high-frequency modes require less damping. However, since the parameters of conventional passive dampers often cannot change with the vibration frequency, it is difficult for them to achieve ideal control effects in the multi-modal control of ultra-long cables with a wide range of controlled modes. The combination of the Maxwell damping unit and the inertial unit can produce certain frequency adaptive characteristics, so that its equivalent damping coefficient can change with the change of the vibration frequency, which is beneficial to the multi-modal vibration control of ultra-long cables or other flexible structures.

[0004] Currently, commonly used inertial units include ball screw inertial units and gear rack driven inertial units. However, these structures have disadvantages such as easy wear of balls, non-compact installation space, many parts, high friction, difficult maintenance and high cost, which restricts their application scenarios. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a hydraulic Maxwell inertial damper, thereby solving the technical problems of the existing passive damper, such as the narrow control frequency range due to the inability to change the control parameters, and the existing inertial unit structure having high friction, easy damage and difficult maintenance.

[0006] To achieve the above object, according to one aspect of the present invention, a hydraulic Maxwell inertial damper is provided, comprising: an inertial mechanism and a Maxwell damping mechanism;

[0007] The inertia mechanism is fixedly arranged on one side of the Maxwell damping mechanism;

[0008] The inertia mechanism comprises a hydraulic drive device and a flywheel, wherein the flywheel is connected to an output shaft of the hydraulic drive device; the hydraulic drive device is connected to a chamber in the Maxwell damping mechanism through a pipeline;

[0009] When the damper is displaced by an external load, the hydraulic medium in the chamber of the Maxwell damping mechanism flows into the hydraulic drive device through a pipeline to drive the output shaft of the hydraulic drive device to rotate. The rotation of the output shaft of the hydraulic drive device drives the flywheel to rotate.

[0010] Preferably, the Maxwell damping mechanism comprises a connecting cylinder, a piston rod, an ear plate, a piston, an elastic member and an end cover;

[0011] The end cover is installed at the open end of the connecting cylinder, the piston rod is arranged in the connecting cylinder and passes through the end cover, and the lug is arranged at one end of the piston rod located outside the connecting cylinder;

[0012] The piston is sleeved on the piston rod, and the piston divides the connecting cylinder into a first chamber and a second chamber;

[0013] One end of the elastic member is fixedly disposed on the inner side of the end cover, and the other end of the elastic member is in contact with the hydraulic medium in the first chamber.

[0014] Preferably, the interior of the first chamber and the interior of the second chamber are filled with the same hydraulic medium.

[0015] Preferably, the hydraulic medium is silicone oil.

[0016] Preferably, the outer wall of the elastic member is in sliding contact with the inner wall of the connecting cylinder.

[0017] Preferably, the elastic member is an air spring.

[0018] Preferably, the hydraulic drive device comprises an oil port A and an oil port B;

[0019] The hydraulic pipelines are connected to the first chamber and the oil port A, and to the second chamber and the oil port B respectively.

[0020] Preferably, the inertial mechanism and the Maxwell damping mechanism are fixedly connected via a steel hoop.

[0021] Preferably, the flywheel is detachably connected to the output shaft of the hydraulic drive device.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. The hydraulic Maxwell inertial damper proposed by the present invention fixes the inertial mechanism on one side of the Maxwell damping mechanism, and the flywheel is connected to the output shaft of the hydraulic drive device. When the damper is displaced by the external load, the hydraulic medium in the chamber of the Maxwell damping mechanism flows into the hydraulic drive device through the pipeline and drives the output shaft of the hydraulic drive device to rotate, thereby driving the flywheel to rotate, which greatly improves the shortcomings of the traditional ball screw structure such as large friction, fragile structure, high cost and difficult maintenance. The inertial system can provide a larger inertial force under a smaller excitation, thereby improving the inertial damping force of the entire system and further improving the energy consumption efficiency.

[0024] 2. The hydraulic Maxwell inertial damper proposed by the present invention arranges the inertial mechanism outside the Maxwell damping mechanism, and the flywheel is arranged on the output shaft of the hydraulic drive device, which can greatly reduce the length of the damper main body and facilitate installation.

[0025] 3. In the hydraulic Maxwell inertial damper proposed by the present invention, the flywheel can be detachably mounted on the output shaft of the hydraulic drive device, so that the flywheel size can be easily replaced to achieve different inertia coefficients.

[0026] 4. The hydraulic Maxwell inertial damper proposed in the present invention comprises two oil circuits respectively connecting the first chamber and the hydraulic drive device, and the second chamber and the hydraulic drive device, so as to facilitate the maintenance of the oil circuit and the replacement of silicone oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the hydraulic Maxwell inertial damper of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the hydraulic Maxwell inertial damper of the present invention;

[0029] Figure 3 is a hysteresis curve diagram measured by the hydraulic Maxwell inertial damper of the present invention;

[0030] Figure 4 It is a curve diagram of the equivalent coefficient variation measured by the hydraulic Maxwell inertial damper of the present invention.

[0031] In all the drawings, the same reference numerals are used to represent the same elements or structures, among which: 1-ear plate; 2-piston rod; 3-end cover; 4-elastic member; 5-first chamber; 6-piston; 7-second chamber; 8-first hydraulic pipeline; 9-flywheel; 10-steel hoop; 11-hydraulic drive device; 12-connecting cylinder; A-first oil inlet; B-second oil inlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The principle diagram of the present invention is as follows Figure 1 As shown, the hydraulic Maxwell inertial damper is composed of an inertial mechanism and a Maxwell damping mechanism in parallel, wherein the Maxwell damping mechanism is composed of a spring and a viscous damper in series.

[0034] like Figure 2 As shown, the present invention proposes a hydraulic Maxwell inertial damper, which specifically includes an ear plate 1, a piston rod 2, an end cover 3, an elastic member 4, a piston 6, a first hydraulic pipeline 8, a flywheel 9, a steel hoop 10, a hydraulic drive device 11 and a connecting cylinder 12.

[0035] Specifically, one end of the connecting cylinder 12 is provided with an end cover 3, one end of the piston rod 2 extends from the end cover 3 and is connected to the ear plate 1, the piston 6 is fixed in the piston rod 2, and the piston 6 is located in the connecting cylinder 12 to divide it into a first chamber 5 and a second chamber 7. The connecting cylinder 12 is provided with an oil port, which connects the first chamber 5 and the first oil inlet A of the hydraulic drive device 11 through the first hydraulic pipeline 8, and connects the second chamber 7 and the second oil inlet B of the hydraulic drive device 11 through the second hydraulic pipeline.

[0036] To further explain, the silicone oil in the first chamber 5 or the second chamber 7 of the damper flows into the hydraulic drive device 11 through the first hydraulic pipeline or the second hydraulic pipeline, thereby driving the output shaft of the hydraulic drive device 11 to rotate and driving the flywheel 9 to rotate together.

[0037] To further explain, one end of the elastic member 4 is fixed on the end cover 3, and the other end is in contact with the silicone oil in the first chamber 5. The elastic member 4 is in close contact with the inner wall of the connecting cylinder 12 and can slide. When the silicone oil applies pressure to the elastic member 4, the elastic member 4 can extend and retract along the direction of the piston rod 2.

[0038] Further explanation, the speed ratio and the rotational inertia of the flywheel of the hydraulic drive device 11 of the present invention can be configured according to actual needs. The elastic member 4 can be replaced by an elastic material such as an air spring or an elastic rubber with good sealing performance.

[0039] Further explanation, the hydraulic Maxwell inertial damper was tested, and the hysteresis curve results are as follows: Figure 3 As shown in the figure, it can be seen that the quasi-negative stiffness characteristics are obvious, which is the effect of the inertial unit. At the same time, the hysteresis curve is relatively full, which means that the damping energy dissipation capacity is improved. The experimental results show the positive impact of the introduction of inertial elements. At the same time, the equivalent damping and equivalent stiffness curves obtained by multiple sets of hysteresis curves are shown in Figure 4 As shown, it can be clearly seen that the variation trend of the equivalent damping coefficient and the equivalent stiffness coefficient of the hydraulic Maxwell inertial damper proposed by the present invention with the frequency, which indicates that the hydraulic Maxwell inertial damper has a significant frequency adaptive characteristic.

[0040] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic Maxwell inertial damper, characterized in that: include: Inertial mechanism and Maxwell damping mechanism; The inertia mechanism is fixedly arranged on one side of the Maxwell damping mechanism; The inertial mechanism comprises a hydraulic drive device (11) and a flywheel (9), wherein the flywheel (9) is connected to an output shaft of the hydraulic drive device (11); the hydraulic drive device (11) is connected to a chamber in the Maxwell damping mechanism through a pipeline; When the damper is displaced by an external load, the hydraulic medium in the chamber of the Maxwell damping mechanism flows into the hydraulic drive device (11) through a pipeline, thereby driving the output shaft of the hydraulic drive device (11) to rotate. The rotation of the output shaft of the hydraulic drive device (11) drives the flywheel (9) to rotate.

2. A hydraulic Maxwell inertial damper according to claim 1, characterized in that: The Maxwell damping mechanism comprises a connecting cylinder (12), a piston rod (2), an ear plate (1), a piston (6), an elastic member (4) and an end cover (3); The end cover (3) is mounted on the open end of the connecting cylinder (12); the piston rod (2) is arranged on the connecting cylinder (12) and passes through the end cover (3); and the lug (1) is provided at one end of the piston rod (2) located outside the connecting cylinder (12); The piston (6) is sleeved on the piston rod (2), and the piston (6) divides the connecting cylinder (12) into a first chamber (5) and a second chamber (7); One end of the elastic member (4) is fixedly arranged on the inner side of the end cover (3), and the other end of the elastic member (4) is in contact with the hydraulic medium in the first chamber (5).

3. A hydraulic Maxwell inertial damper according to claim 2, characterized in that: The interior of the first chamber (5) and the interior of the second chamber (7) are filled with the same hydraulic medium.

4. A hydraulic Maxwell inertial damper according to claim 3, characterized in that: The hydraulic medium is silicone oil.

5. The hydraulic Maxwell inertial damper according to claim 3, characterized in that: The outer wall of the elastic member (4) is in sliding contact with the inner wall of the connecting cylinder (12).

6. A hydraulic Maxwell inertial damper according to claim 5, characterized in that: The elastic member (4) is an air spring.

7. The hydraulic Maxwell inertial damper according to claim 3, characterized in that: The hydraulic drive device (11) comprises an oil port (A) and an oil port (B); The hydraulic pipeline (8) is connected to the first chamber (5) and the oil port (A) and to the second chamber (7) and the oil port (B) respectively.

8. The hydraulic Maxwell inertial damper according to claim 1, characterized in that: The inertia mechanism and the Maxwell damping mechanism are fixedly connected via a steel hoop (10).

9. The hydraulic Maxwell inertial damper according to claim 1, characterized in that: The flywheel (9) is detachably connected to the output shaft of the hydraulic drive device (11).

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