Clearance-adjustable collision damper
Through the adjustable gap collision shock absorber, by adjusting the insertion depth of the limiter and the gap between the vibrator and the limiter, the problem of poor applicability of existing collision shock absorbers in different systems is solved, and a more efficient vibration reduction effect is achieved.
Patent Information
- Application Number
- CN202423027962.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-12-06
AI Technical Summary
The vibration reduction effect of existing collision shock absorbers is related to the collision gap value, and cannot achieve the best effect in systems with different mass, stiffness and vibration characteristics, resulting in poor applicability.
An adjustable gap collision damper is designed. By adjusting the insertion depth of the limiter in the channel, the gap between the vibrator and the limiter is adjusted to adapt to systems with different vibration characteristics.
By adjusting the gap, the vibration reduction effect can be changed to adapt to different vibration reduction application scenarios, thereby improving the applicability and vibration reduction efficiency of the collision shock absorber.
Smart Images
Figure CN223399157U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vibration reduction technology, and in particular to an adjustable clearance collision vibration absorber. Background Art
[0002] Vibration is a widespread phenomenon in engineering technology, such as the vibration of bridges and buildings caused by wind or earthquakes, and the vibration of machine tools and cutting tools during machining. In many cases, vibration is viewed as a negative factor, affecting the function of precision instruments and equipment, exacerbating component fatigue and wear, and shortening the service life of machinery and structures. Therefore, the research and application of vibration reduction technology is of great significance. Vibration reduction technology primarily improves the safety performance of structures by reducing or eliminating structural vibration. Traditional vibration control technologies include passive control and active control. Passive control primarily uses vibration reduction devices such as mass and elastic control materials, such as vibration isolation supports and dampers. Active control uses controllers to actively adjust the structure, such as active vibration absorbers and active dampers.
[0003] Nonlinear energy sinks (NESs) have the advantages of simple structure, low added mass, and high vibration absorption efficiency, and therefore have broad application prospects for vibration reduction. Their working principle is that during vibration, a certain amount of energy is transferred from the main structure to the nonlinear auxiliary structure containing the NES, where it is dissipated through damping, thereby achieving energy dissipation and vibration reduction of the main structure. Impact and collision are common nonlinear phenomena in compact vibrating structures. In the field of dynamics research, researchers attempt to develop new vibration reduction strategies based on these impact vibrations. Incorporating collision factors into NESs has been proven to effectively suppress vibrations in various systems.
[0004] However, while collision shock absorbers have excellent effects, their vibration reduction effect is related to the collision gap value. For systems with different masses, stiffnesses and different vibration characteristics, the gap values that can achieve the best vibration reduction effect are different. Therefore, it may not be able to exert the vibration reduction effect under various structures, resulting in its low applicability. Utility Model Content
[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an adjustable clearance collision damper, which can adjust the collision clearance inside the damper to adapt to systems with different vibration characteristics.
[0006] The adjustable clearance collision damper according to an embodiment of the present application includes:
[0007] The shell is tubular, and a passage is formed inside the shell, with both ends of the passage being open;
[0008] a vibrator disposed in the channel, wherein the vibrator is movable along the channel;
[0009] There are two limiters, which are inserted into the two ends of the channel in a one-to-one correspondence. The insertion depth of the limiters can be adjusted, and the vibrator moves between the two limiters;
[0010] An elastic pad is installed at the end of the limiting member, the vibrator can directly contact the elastic pad, and the elastic pad is used to absorb the impact kinetic energy of the vibrator.
[0011] The adjustable gap collision damper according to the embodiment of the present application has at least the following beneficial effects: by adjusting the insertion depth of the limiter in the channel, the gap between the vibrator and the limiter can be adjusted, thereby changing the vibration reduction effect and adapting to different vibration reduction application scenarios.
[0012] According to some embodiments of the present application, the vibrator is spherical and rolls in the channel.
[0013] According to some embodiments of the present application, the limiting member is cylindrical, and the cross-section of the channel is circular and matches the cross-sectional shape of the limiting member.
[0014] According to some embodiments of the present application, the limiting member is pluggably connected to the shell.
[0015] According to some embodiments of the present application, the side wall of the limit member is provided with a thread, and the adjustable gap collision damper also includes a nut, which is fixed to the end of the channel. The limit member is threadedly connected to the nut, and the distance of the limit member extending into the channel can be adjusted by screwing the limit member.
[0016] According to some embodiments of the present application, the elastic pad is bonded to the end of the limiting member.
[0017] According to some embodiments of the present application, a transparent observation window is provided on the side of the shell.
[0018] According to some embodiments of the present application, a scale is provided on the observation window to facilitate confirmation of the gap between the vibrator and the limiting member.
[0019] According to some embodiments of the present application, the shell is provided with a mounting seat, and the shell is mounted to the main vibration structure through the mounting seat.
[0020] According to some embodiments of the present application, the mounting seat is provided with a mounting hole, the mounting hole can allow a bolt to pass through, and the shell is mounted to the main vibration structure by means of bolt fixing.
[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings are used to provide a further understanding of the technical solutions disclosed in this application and constitute a part of the specification. Together with the embodiments disclosed in this application, they are used to explain the technical solutions disclosed in this application and do not constitute a limitation on the technical solutions disclosed in this application.
[0023] Figure 1 This is a disassembled diagram of the adjustable clearance collision shock absorber according to an embodiment of the present application;
[0024] Figure 2 This is a schematic diagram of a dynamic model of an adjustable clearance collision shock absorber according to an embodiment of the present application;
[0025] Figure 3 This is a displacement time history diagram of the main vibration structure when the gap value of the adjustable gap collision shock absorber according to the embodiment of the present application is 2 mm;
[0026] Figure 4 This is a time history diagram of the displacement of the main vibration structure when the gap value of the adjustable gap collision shock absorber in the embodiment of the present application is 1 mm.
[0027] Reference numerals: 100 - housing, 110 - observation window, 120 - mounting seat, 121 - mounting hole, 200 - vibrator, 300 - limiter, 400 - elastic pad, 500 - nut, 600 - main vibration structure. DETAILED DESCRIPTION
[0028] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.
[0029] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.
[0030] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.
[0031] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.
[0032] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.
[0033] Vibration is a widespread phenomenon in engineering technology, such as the vibration of bridges and buildings caused by wind or earthquakes, and the vibration of machine tools and cutting tools during machining. In many cases, vibration is viewed as a negative factor, affecting the function of precision instruments and equipment, exacerbating component fatigue and wear, and shortening the service life of machinery and structures. Therefore, the research and application of vibration reduction technology is of great significance. Vibration reduction technology primarily improves the safety performance of structures by reducing or eliminating structural vibration. Traditional vibration control technologies include passive control and active control. Passive control primarily uses vibration reduction devices such as mass and elastic control materials, such as vibration isolation supports and dampers. Active control uses controllers to actively adjust the structure, such as active vibration absorbers and active dampers.
[0034] Nonlinear energy sinks (NESs) have the advantages of simple structure, low added mass, and high vibration absorption efficiency, and therefore have broad application prospects for vibration reduction. Their working principle is that during vibration, a certain amount of energy is transferred from the main structure to the nonlinear auxiliary structure containing the NES, where it is dissipated through damping, thereby achieving energy dissipation and vibration reduction of the main structure. Impact and collision are common nonlinear phenomena in compact vibrating structures. In the field of dynamics research, researchers attempt to develop new vibration reduction strategies based on these impact vibrations. Incorporating collision factors into NESs has been proven to effectively suppress vibrations in various systems.
[0035] However, while collision shock absorbers have excellent effects, their vibration reduction effect is related to the collision gap value. For systems with different masses, stiffnesses and different vibration characteristics, the gap values that can achieve the best vibration reduction effect are different. Therefore, it may not be able to exert the vibration reduction effect under various structures, resulting in its low applicability.
[0036] In this regard, the present application proposes an adjustable gap collision damper, which can adjust the gap between the vibrator 200 and the limiter 300 by adjusting the insertion depth of the limiter 300 in the channel, thereby changing the vibration reduction effect and adapting to different vibration reduction application scenarios.
[0037] Reference Figure 1 The adjustable gap collision damper in the embodiment of the present application includes a shell 100, a vibrator 200, a limiter 300 and an elastic pad 400. The shell 100 is the main structure of the adjustable gap collision damper. It is tubular and open at both ends. The vibrator 200 can be movably placed inside the shell 100. The limiter 300 is installed at the end of the shell 100. On the one hand, it is used to limit the vibrator 200 inside the shell 100. On the other hand, it can adjust the installation position of the limiter 300 in the shell 100, thereby changing the gap between the vibrator 200 and the limiter 300. The elastic pad 400 is installed at the end of the limiter 300 to cushion the impact force generated when the vibrator 200 collides with the limiter 300. The elastic pad 400 weakens the kinetic energy of the vibrator 200 by converting part of the impact kinetic energy into elastic potential energy.
[0038] Specifically, the shell 100 is tubular, and a channel is provided inside the shell 100, with both ends of the channel being open. The vibrator 200 is placed in the channel, enters from one end of the channel, and can move along the channel. There are two limiters 300, which are inserted into the two ends of the channel in a one-to-one correspondence. It is worth noting that the insertion depth of the limiter 300 can be adjusted, and the vibrator 200 moves between the two limiters 300. The elastic pad 400 is installed at the end of the limiter 300, and the vibrator 200 can directly contact the elastic pad 400. The elastic pad 400 is an elastic member, which is used to absorb the impact kinetic energy of the vibrator.
[0039] The working principle of the adjustable gap collision damper is as follows: after the vibrator 200 is placed in the channel of the housing 100, two limiting members 300 are respectively inserted into the two ends of the channel of the housing 100 to limit the vibrator 200 between the two limiting members 300. Figure 2 After the adjustable gap collision damper is installed on the main vibration structure 600 to be damped, when the main vibration structure 600 vibrates, the elastic potential energy of its active vibration is Km, and the damping coefficient is Cm. The main vibration structure 600 will drive the vibrator 200 in the channel to move back and forth. At this time, part of the kinetic energy of the main vibration structure 600 is converted into the kinetic energy of the vibrator 200.
[0040] Reference Figure 3After giving the main vibration structure 600 a certain external excitation force, the system vibration displacement response time before and after the installation of the adjustable gap collision shock absorber was analyzed. The displacement response shows that the maximum vibration displacement of the main structure without the shock absorber is 1.87mm; the maximum vibration displacement of the main structure with the shock absorber installed is 1.27mm. The maximum displacement of the structure without the shock absorber is significantly greater than the maximum displacement of the structure with the shock absorber installed, indicating that the collision shock absorber reduces the vibration amplitude of the system under long-term vibration, and its vibration reduction is effective. At this time, the gap value is 2mm, and the vibration reduction rate of the shock absorber is 32.08%. Figure 4 By changing the gap value between the vibrator 200 and the limiter 300, it was found that when the gap value was 1mm, the maximum structural displacement under long-term vibration was reduced to 1.08mm. At this time, the vibration reduction rate was 42.10%, which was higher than the vibration reduction rate when the gap value was 2mm. This shows that the adjustment of the gap value helps to give full play to the optimal vibration reduction performance of the collision shock absorber.
[0041] After vibrator 200 strikes the stopper 300 at the end of the channel, the elastic pad 400 acts as a buffer, partially absorbing the vibrator 200's kinetic energy. At this point, the elastic pad 400 can be considered an element with elastic potential energy Kn and a damping coefficient Cn. As vibrator 200 moves back and forth and repeatedly strikes the stoppers 300 at both ends of the channel, the vibrator's kinetic energy is gradually weakened, thereby suppressing the vibration of the main vibrating structure 600.
[0042] To better accommodate different vibration modes of the main vibration structure 600, the depth to which the limiter 300 is inserted into the channel is adjustable, thereby adjusting the gap d between the limiter 300 and the vibrator 200. When the limiter 300 is inserted to a greater depth, the gap d between the limiter 300 and the vibrator 200 is smaller, resulting in a higher frequency of back-and-forth impacts of the vibrator 200. When the limiter 300 is inserted to a lesser depth, the gap d between the limiter 300 and the vibrator 200 is larger, resulting in a lower frequency of back-and-forth impacts of the vibrator 200. By adjusting the insertion depth of the limiter 300, the impact frequency of the vibrator 200 can be changed to match the vibration frequency of the main vibration structure 600.
[0043] Specifically, the vibrator 200 may be in the shape of a cylinder, a sphere, an ellipsoid, etc. In this embodiment, the vibrator 200 is spherical and can roll within the channel, thereby enabling the vibrator 200 to move more smoothly within the channel, shortening the time of its back-and-forth collision, and allowing the kinetic energy of the vibrator 200 to be absorbed more quickly by the elastic pad 400.
[0044] Specifically, the stopper 300 is cylindrical, and the cross section of the channel is circular, matching the cross section of the stopper 300. Thus, the inner wall profile of the channel is more suitable for the spherical vibrator 200. The design of the channel and the stopper 300 is more compact, reducing production costs.
[0045] Regarding the connection between the stopper 300 and the housing 100, in some embodiments, the stopper 300 and the housing 100 are pluggable. The stopper 300 can be quickly inserted into or removed from the channel, making assembly and disassembly more convenient. Furthermore, the stopper 300 can be continuously extended along the channel, thereby allowing for greater flexibility in adjusting the gap between the stopper 300 and the vibrator 200.
[0046] In this embodiment, the sidewall of the limiter 300 is provided with threads, and the adjustable gap collision damper further includes a nut 500, which is fixed to the end of the channel. The limiter 300 is threadedly connected to the nut 500, and the distance the limiter 300 extends into the channel can be adjusted by screwing the limiter 300. Because the limiter 300 is connected to the nut 500 using a threaded connection, the insertion distance of the limiter 300 can be more precisely controlled; and the threaded connection has a self-locking function, which can reduce the possibility of the limiter 300 being displaced due to the impact of the vibrator 200, thereby maintaining the consistency of the gap between the vibrator 200 and the limiter 300.
[0047] Furthermore, the elastic pad 400 is bonded to the end of the limiter 300, thereby improving the connection strength between the elastic pad 400 and the limiter 300 and preventing the elastic pad 400 from loosening from the end of the limiter 300 under frequent impact.
[0048] Furthermore, a transparent observation window 110 is provided on the side of the housing 100 , through which a worker can observe the movement of the vibrator 200 in the channel, thereby understanding whether the vibrator 200 is still in a normal working state.
[0049] Furthermore, the observation window 110 is provided with a scale to facilitate the operator to confirm the gap between the vibrator 200 and the stopper 300. When adjusting the gap between the vibrator 200 and the stopper 300, the operator can observe through the observation window 110 while adjusting the insertion depth of the stopper 300 until the gap between the vibrator 200 and the stopper 300 is adjusted to an acceptable distance.
[0050] Furthermore, to facilitate installation of the adjustable gap collision damper to the main vibration structure 600, the housing 100 is further provided with a mounting base 120, through which the housing 100 is mounted to the main vibration structure 600. The mounting base 120 is extended outward relative to the housing 100 to increase the contact area with the main vibration structure 600 and thus improve installation stability.
[0051] The mounting seat 120 can be connected to the main vibration structure 600 by bonding or bolting. In this embodiment, the mounting seat 120 is provided with a mounting hole 121, and the mounting hole 121 can allow a bolt to pass through. The shell 100 is installed on the main vibration structure 600 by bolting.
[0052] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.
Claims
1. An adjustable clearance collision shock absorber, characterized in that: include: The shell is tubular, and a passage is formed inside the shell, with both ends of the passage being open; a vibrator disposed in the channel, wherein the vibrator is movable along the channel; There are two limiters, which are inserted into the two ends of the channel in a one-to-one correspondence. The insertion depth of the limiters can be adjusted, and the vibrator moves between the two limiters; An elastic pad is installed at the end of the limiting member, the vibrator can directly contact the elastic pad, and the elastic pad is used to absorb the impact kinetic energy of the vibrator.
2. The adjustable clearance collision shock absorber according to claim 1, characterized in that: The vibrator is spherical and rolls in the channel.
3. The adjustable clearance collision shock absorber according to claim 1, characterized in that: The limiting member is cylindrical, and the cross section of the channel is circular and matches the cross section of the limiting member.
4. The adjustable clearance collision damper according to claim 3, characterized in that: The limiting member is pluggably connected to the housing.
5. The adjustable clearance collision shock absorber according to claim 3, characterized in that: The side wall of the limiter is provided with a thread, and the adjustable gap collision damper also includes a nut, which is fixed to the end of the channel. The limiter is threadedly connected to the nut, and the distance of the limiter extending into the channel can be adjusted by screwing the limiter.
6. The adjustable clearance collision damper according to claim 1, characterized in that: The elastic pad is bonded to the end of the limiting member.
7. The adjustable clearance collision shock absorber according to claim 1, characterized in that: A transparent observation window is provided on the side of the shell.
8. The adjustable clearance collision damper according to claim 7, characterized in that: The observation window is provided with a scale to facilitate confirmation of the gap between the vibrator and the limiting member.
9. The adjustable clearance collision damper according to claim 1, characterized in that: The shell is provided with a mounting seat, and the shell is mounted on the main vibration structure through the mounting seat.
10. The adjustable clearance collision damper according to claim 9, characterized in that: The mounting seat is provided with a mounting hole, and the mounting hole can allow a bolt to pass through. The shell is fixed to the main vibration structure by means of bolts.