Multi-vibration mode non-smooth vibration-absorbing superstructure

Abstract

A multi-vibration-mode non-smooth vibration-absorbing superstructure includes a mass block and periodic structures symmetrically located on both sides of the mass block. The periodic structure includes multiple identical unit cells, a first wall panel, multiple second wall panels, a third wall panel, and a baffle. A unit cell is arranged between adjacent two wall panels; each wall panel has a beam body and protruding parts located at both ends of the beam body. The protruding parts and the baffle are both used to apply displacement constraints, so that the periodic structure exhibits non-smooth stiffness characteristics; the distance between the first wall panel and the adjacent second wall panel is not equal to the distance between the third wall panel and the adjacent second wall panel, and the distances between adjacent second wall panels are also not equal. The superstructure is prepared by 3D printing, can achieve four vibration modes, and its unit cell itself has certain non-linear stiffness characteristics. By different stop blocks, protruding parts and wall panel distances, displacement constraints are gradually applied to make the periodic structure exhibit non-smooth stiffness characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration damping superstructures, and in particular to a multi-vibration-mode non-smooth vibration-absorbing superstructure. Background Art

[0002] Horizontal vibration isolators are usually used to protect precision instrument equipment, cultural relics, etc. from the damage of seismic loads. Traditional linear vibration isolators have the problem of a narrow vibration isolation frequency band. Existing quasi-zero-stiffness vibration isolators will have an amplitude jump phenomenon under large loads, and gravity-type vibration isolators have problems such as complex structures and inconvenient maintenance. In order to avoid causing significant losses, higher requirements are put forward for horizontal vibration isolators. Currently, there is an urgent need for a device that can still achieve broadband vibration isolation when the earthquake intensity changes greatly, so as to effectively protect precision instrument equipment and cultural relics.

[0003] Vibration will cause harm to devices and structures in most cases, involving multiple fields such as mechanical engineering, aerospace, and architecture. Vibration absorption is an effective way to solve engineering vibration problems, and existing various vibration absorbers all have their own limitations. Linear ones are very sensitive to system structure changes and external excitation environments. Slight deviation from their natural frequencies will produce a detuning effect. Traditional linear vibration isolators have the problem of a narrow vibration isolation frequency band. Existing quasi-zero-stiffness vibration isolators will have an amplitude jump phenomenon under large loads, and gravity-type vibration isolators have problems such as complex structures and inconvenient maintenance. Nonlinear vibration absorbers, especially strong nonlinear vibration absorbers, have excellent characteristics such as broadband vibration absorption and light weight, but they will have a sudden failure problem caused by amplitude jump when the external excitation environment is relatively complex, and existing solutions for realizing nonlinear stiffness through springs and magnets face various limitations and it is difficult to make great breakthroughs. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a multi-vibration-mode non-smooth vibration-absorbing superstructure. The superstructure can generate different vibration modes with the change of external excitation, so as to realize the control of broadband excitation. And because the superstructure itself is provided with a plurality of deformation constraint parts, the occurrence of sudden failure can be avoided.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] A multi-vibration-mode non-smooth vibration-absorbing superstructure, including a mass block and periodic structures symmetrically located on both sides of the mass block, and the mass block and the periodic structures are connected by a first connecting rod;

[0007] The periodic structure includes multiple unit cells with the same structure, a first wall panel, multiple second wall panels, a third wall panel, and a baffle. One unit cell is arranged between two adjacent wall panels; each wall panel has a beam body and protruding parts located at both ends of the beam body. The protruding parts are arranged oppositely and there is a certain distance between two adjacent protruding parts; the baffle extends from the upper surface of the beam body of the second wall panel between two centrally arranged unit cells and then extends towards the mass block. There is a certain distance between the opposite side walls of the baffles of two periodic structures. The protruding parts and the baffle are both used to apply displacement constraints, making the periodic structure exhibit non-smooth stiffness characteristics;

[0008] The first wall panel and the third wall panel are respectively located at both ends of the periodic structure, where the first wall panel is close to the mass block and the second wall panels are located between the first wall panel and the third wall panel;

[0009] Moreover, the distance between the first wall panel and the adjacent second wall panel is not equal to the distance between the third wall panel and the adjacent second wall panel, and the distances between adjacent second wall panels are also not equal.

[0010] Furthermore, the superstructure is integrally formed by 3D printing technology.

[0011] Furthermore, the two ends of the protruding part of the second wall panel extend out of the side wall of the beam body, and the ends of the protruding parts of the first and third wall panels facing the second wall panel also extend out of the side wall of the beam body.

[0012] Furthermore, a groove is arranged along the longitudinal direction of the beam body of the second wall panel for weight reduction.

[0013] Furthermore, the number of the second wall panels is 3, which are respectively the left side wall panel close to the mass block, the right side wall panel farthest from the mass block, and the middle wall panel located between the left side wall panel and the right side wall panel; and the distance between the first wall panel and the left side wall panel < the distance between the left side wall panel and the middle wall panel < the distance between the middle wall panel and the right side wall < the distance between the right side wall panel and the third wall panel.

[0014] Furthermore, from far to near the mass block are the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell; the unit cell is of I-shaped structure, including a centrally arranged unit cell mass block and four completely identical slender curved beams. The length of the curved beam is determined according to the stiffness requirement of the superstructure. One end of the curved beam is fixedly connected to the side wall of the unit cell mass block, and the other end is fixedly connected to the protruding part, and the curved beams are arranged in pairs oppositely.

[0015] Furthermore, the superstructure has four vibration modes:

[0016] The first vibration mode: The displacement at the left side wall panel is the smallest. The main oscillator and the mass block drive the first - fourth unit cells to make reciprocating periodic motions towards the left side wall panel simultaneously;

[0017] The second vibration mode: the amplitudes of the right side wall panel, the middle wall panel, and the left side wall panel increase gradually, and the amplitude of the mass block is the largest; and the peak moments generated by the right side wall panel, the middle wall panel, and the left side wall panel are close;

[0018] The third vibration mode: the displacement at the middle wall panel is the smallest, and the main oscillator and the mass block drive the first to fourth unit cells to make reciprocating periodic motions towards the middle wall panel;

[0019] The fourth vibration mode: the displacement at the right side wall panel is the smallest, and the main oscillator and the mass block drive the first to fourth unit cells to make reciprocating periodic motions towards the right side wall panel at the same time, and the peak moments generated by the right side wall panel, the middle wall panel, and the left side wall panel are different.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The superstructure described in the present invention is a symmetric structure, and its unit cell itself has certain non-linear stiffness characteristics. By varying the distances between the square stoppers and the unit cell wall panels, displacement constraints are gradually applied to make the periodic structure exhibit non-smooth stiffness characteristics. The multi-vibration-mode non-smooth vibration-absorbing superstructure is realized by 3D printing technology, and the entire structure is completed by printing at one time. The superstructure can be processed using all existing 3D printing materials. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the multi-vibration-mode non-smooth vibration-absorbing superstructure described in the present invention;

[0023] Figure 2 is Figure 1 the top view of;

[0024] Figure 3 is a schematic structural diagram of the unit cell;

[0025] Figure 4 is a constitutive relation diagram of the load received by the multi-vibration-mode non-smooth vibration-absorbing superstructure under different displacements;

[0026] Figure 5 is a frequency response diagram of the main oscillator obtained by setting accelerations to 0.04g, 0.06g, 0.08g, 0.1g, and 0.12g respectively;

[0027] Figure 6 is a displacement response signal diagram of the main oscillator, the mass block, the right side wall panel, the middle wall panel, and the left side wall panel of the high-frequency band resonance peak obtained when the excitation acceleration is 0.12g;

[0028] Figure 7It is the displacement response signal diagram of the main oscillator, mass block, right side wall panel, middle wall panel, and left side wall panel when the excitation acceleration is 0.12g to obtain the resonance peak in the low-frequency band.

[0029] In the figure:

[0030] 1: The first unit cell 2: The second unit cell 3: The third unit cell

[0031] 4: The fourth unit cell 5: Mass block 6: Baffle

[0032] 7: Support plate 8: Curved beam 9: Cantilever

[0033] 11: Unit cell mass block 12: Protrusion 13: First wall panel

[0034] 14: Second wall panel 15: Third wall panel 16: Beam body

[0035] 51: First connecting rod 52: First hole 53: Second hole

[0036] 54: First region 55: Second region

[0037] 141: Left side wall panel 142: Middle wall panel 143: Right side wall panel Detailed implementation manners

[0038] To make the objectives, technical solutions, beneficial effects, and remarkable progress of the embodiments of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings provided in the embodiments of the present invention. Obviously, all the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The following further explains the working process of the device with reference to the accompanying drawings.

[0040] As Figure 1-2 shown, a multi-vibration-mode non-smooth vibration-absorbing superstructure includes a mass block 5 and periodic structures symmetrically located on both sides of the mass block 5. The superstructure is integrally formed by 3D printing technology, and the 3D printing material is ABS. PC, PEEK, TPU, or carbon fiber materials can also be used according to actual needs. One side wall of the periodic structure is fixedly connected to the side wall opposite to the mass block 5 through a first connecting rod 51.

[0041] The mass block 5 includes a first region 54 and a second region 55. The first region is disposed in the center, and the second regions 55 are respectively located at two opposite ends of the first region 54. There are 8 first holes 52 arranged in a matrix and penetrating through its thickness on the first region, which are used to connect with the guide rail slider through bolts; there are 3 second holes 53 penetrating through the second region 55 for connecting springs as required (the stiffness requirement of the vibration damping element for the shock absorber).

[0042] The periodic structure includes four unit cells with the same structure, a first wall plate 13, three second wall plates 14, a third wall plate 15 and a square baffle 6. Each wall plate has a beam body 16 and protruding parts 12 located at both ends of the beam body 16. The two ends of the protruding part 12 of the second wall plate 14 extend out of the side wall of the beam body 16, and the ends of the protruding parts 12 of the first and third wall plates facing the second wall plate 14 also extend out of the side wall of the beam body 16 to prevent the superstructure from being over-compressed. The first wall plate 13 and the third wall plate 15 are respectively located at both ends of the periodic structure, wherein the first wall plate 13 is close to the mass block 5, and both ends of the first connecting rod 51 are respectively connected to the first wall plate 13 and the mass block 5. The third wall plate 15 is at the farthest end from the mass block 5. The three second wall plates 14 are located between the first wall plate 13 and the third wall plate 15, and the beam body 16 of the second wall plate 14 is provided with grooves along its longitudinal direction for weight reduction to make the mass of the superstructure as light as possible. The three second wall plates 14 are respectively the left side wall plate 141 close to the mass block 5, the right side wall plate 143 farthest from the mass block 5, and the middle wall plate 142 located between the left side wall plate 141 and the right side wall plate 143. Moreover, the distance between the first wall plate 13 and the left side wall plate 141 is not equal to the distance between the right side wall plate 143 and the third wall plate 15, and the distances between the three second wall plates 14 are also not equal, where the distance between the first wall plate 13 and the left side wall plate 141 < the distance between the left side wall plate 141 and the middle wall plate 142 < the distance between the middle wall plate 142 and the right side wall plate 143 < the distance between the right side wall plate 143 and the third wall plate 15.

[0043] From far to near the mass block 5 are the first unit cell 1, the second unit cell 2, the third unit cell 3 and the fourth unit cell 4, as Figure 3As shown in the figure, the unit cell has an I-shaped structure. Each unit cell includes a unit cell mass block 11 disposed in the center and four identical slender curved beams 8. The length of the curved beam 8 is determined according to the stiffness requirement of the superstructure. When the superstructure requires a large stiffness, the curved beam is shorter; otherwise, the curved beam is longer. The curved beam 8 serves as an elastic body. One end of the curved beam is fixedly connected to the side wall of the unit cell mass block 11, and the other end is fixedly connected to the protruding portion 12. The curved beams 8 are arranged in pairs opposite to each other. The curved beams 8 of the first unit cell 1 are respectively fixed to the side walls of the second wall plate 14 and the third wall plate 15. The end portions of the curved beams 8 of the second unit cell 2 and the third unit cell 3 are respectively fixed to the side wall of the second wall plate 14. The curved beams 8 of the fourth unit cell 4 are respectively fixed to the side walls of the second wall plate 14 and the first wall plate 13.

[0044] The baffle 6 and a support plate 7 are respectively arranged parallel to the upper and lower surfaces of the periodic structure and are at a certain distance from the surface of the periodic structure. There is a certain distance between the opposite side walls of the baffles 6 of the two periodic structures for applying displacement constraints, so that the periodic structure exhibits non-smooth stiffness characteristics. When the unit cells, especially the third and fourth unit cells, are deformed greatly, the two baffles 6 will collide, thereby restricting the third and fourth unit cells from being over-stretched and preventing the deformation of the unit cells from increasing further. The support plate is used to connect the slider on the guide rail. As Figure 1 shown, one end of the baffle 6 and the support plate 7 respectively extends from the upper and lower surfaces of the beam body 16 of the intermediate wall plate 142 located between the second unit cell 2 and the third unit cell 3 and then extends towards the mass block 5. The other ends of the baffle 6 and the support plate 7 are respectively fixedly connected to a vertically arranged wall at the gap between the mass block 5 and the fourth unit cell 4.

[0045] Experiment 1: Static experiment

[0046] When testing the constitutive relationship of the superstructure of the present invention, for the convenience of measurement, a cantilever 9 with a ring is connected to the mass block 5. The end of the force gauge is hooked on the ring; the other end of the force gauge is connected to the electric lead screw slide table module, so that the force gauge slides along the guide rail of the electric lead screw slide table module, thereby precisely controlling the displacement. Figure 4 Shows the loads received by the multi-vibration mode non-smooth vibration absorption superstructure at different displacements. Under the control of the electric lead screw slide table module, after the multi-vibration mode non-smooth vibration absorption superstructure of the present invention is displaced by a certain distance, due to the action of the protruding portion 12 and the square baffle 6, the stiffness of the superstructure can exhibit non-smooth characteristics. [[ID=1I5]]

[0047] Experiment 2: Dynamic experiment

[0048] The device for this experiment mainly consists of an exciter, an acceleration sensor, a main oscillator, a feedback sensor, and a multi-vibration-mode vibration-absorbing superstructure. In this experiment, the mass ratio of the mass m of the mass block 5 to the mass M of the main oscillator is approximately 10%. The sinusoidal excitation required for the experiment is provided by the exciter.

[0049] An MGN 15C-700 guide rail is provided on the supporting base / work platform. A sliding baffle and the main oscillator can move horizontally along the guide rail, and the guide rail provides damping for the main oscillator. The multi-vibration-mode vibration-absorbing superstructure is arranged on the upper surface of the main oscillator. The first hole 52 of the mass block 5 is connected to the guide rail slider through bolts. Two fixed baffles perpendicular to the upper surface of the main oscillator are arranged on the upper surface of the main oscillator. The third wall plates 15 (with through holes on the side walls of the third wall plates, as Figure 1 shown) on both sides of the multi-vibration-mode vibration-absorbing superstructure are fixedly connected to the fixed baffles through bolts. One end of a linear spring with a stiffness of 14000 N / m is fixedly connected to a fixed baffle. The other end of the linear spring is connected to the sliding baffle. The other side of the sliding baffle is sequentially connected to the feedback sensor and the exciter. The linear spring is used to provide linear stiffness for the main oscillator. The feedback sensor is used to provide a feedback signal, and an ECON signal acquisition instrument is used to process and analyze the vibration response acceleration signal.

[0050] Multiple acceleration sensors are respectively attached to the upper surface of the main oscillator, the upper surface of the mass block 5 of the multi-vibration-mode vibration-absorbing superstructure, the right side wall plate 143 between the first unit cell 1 and the second unit cell 2 of one of the periodic structures, the middle wall plate 142 between the second unit cell 2 and the third unit cell 3, and the left side wall plate 141 between the third unit cell 3 and the fourth unit cell 4, so as to obtain the response acceleration signals of the main oscillator, the mass block, the right side wall plate 143, the middle wall plate 142, and the left side wall plate 141.

[0051] The steps during the experiment are as follows:

[0052] Step 1: Connect the linear spring to the main oscillator. Set the accelerations to 0.04g, 0.06g, 0.08g, 0.1g, and 0.12g respectively, and obtain the acceleration response signal of the main oscillator. Convert the acceleration signal into a displacement signal through double integration. Respectively take the maximum amplitude of the waveform diagram at different accelerations with a frequency of 3.5 - 9.5 Hz, so as to obtain the frequency response diagram of the main oscillator as shown in Figure 5 shown. At this time, the multi-vibration-mode vibration-absorbing superstructure is not installed.

[0053] Step 2: Install the multi-vibration-mode vibration-absorbing superstructure on the main surface of the main oscillator. Use the method in Step 1 to collect the response acceleration signal of the main oscillator, and draw the frequency response diagram of the main oscillator connected to the multi-vibration-mode vibration-absorbing superstructure, as shown in Figure 5 shown.

[0054] In the experiment where only the main oscillator was connected in Step 1, the resonance frequency band range with an acceleration of 0.04g - 0.12g was 7.8 - 8.2 Hz, and the resonance frequency increased slightly with the increase of acceleration. The corresponding amplitudes were 4.062 mm, 6.736 mm, 8.843 mm, 10.606 mm, and 12.979 mm respectively. After installing the multi-vibration mode vibration absorber superstructure in Step 2, the amplitude of the main oscillator decreased significantly, but at the same time, additional resonance peaks appeared. This is because the restoring force of the multi-vibration mode vibration absorber superstructure has both linear and non-linear terms. The resonance frequency band range with a low frequency of 0.04 - 0.12g acceleration was 3.8 - 4.2 Hz, and the corresponding amplitudes were 41.251 mm, 1.857 mm, 2.469 mm, 3.02 mm, and 3.627 mm respectively. Compared with the amplitude of the main oscillator of the vibration absorber superstructure without non-smooth non-linearity at an acceleration of 0.12g, it decreased by about 68.9%. The resonance frequency band with a high frequency in the same acceleration range was 9 - 9.1 Hz, and the corresponding amplitudes were 1.548 mm, 3.457 mm, 4.037 mm, 4.45 mm, and 5.524 mm respectively. Compared with the amplitude of the main oscillator of the multi-vibration mode vibration absorber superstructure at an acceleration of 0.12g, it decreased by about 83.2%. Since the main oscillator with the multi-vibration mode vibration absorber superstructure of the present invention has two peaks, a relatively wide frequency band, and there is no obvious peak in the amplitude of the main oscillator within the frequency band of 4.5 - 7.6 Hz, and the change is gentle, it is omitted in the figure.

[0055] When the excitation acceleration was 0.12g, the displacement response signals of the main oscillator, the mass block 5, the right side wall 143, the middle wall 142, and the left side wall 141 for the high-frequency band resonance peak (frequency band range of 8.8 - 9.2 Hz) were obtained. As Figure 6 shown, the displacement of the left side wall 141 was the smallest, and the main oscillator and the mass block 5 drove the first to fourth unit cells to perform reciprocating periodic motion towards the left side wall 141 at the same time. At this time, the multi-vibration mode vibration absorber superstructure showed the first vibration mode. At this time, the peak moments of the main oscillator, the right side wall 143, and the middle wall 142 were close, and the peaks generated by the vibration of the left side wall 141 and the mass block 5 were different from the other three.

[0056] When the excitation acceleration was 0.12g, the displacement response signals of the main oscillator, the mass block 5, the right side wall 143, the middle wall 142, and the left side wall 141 for the low-frequency band resonance peak (frequency band range of 3.8 - 4.2 Hz) were obtained. As Figure 7 shown, the amplitudes of the right side wall 143, the middle wall 142, and the left side wall 141 increased, and the amplitude of the mass block 5 was the largest. At this time, the multi-vibration mode vibration absorber superstructure showed the second vibration mode. At this time, the peak moments generated by the main oscillator, the mass block 5, the right side wall 143, the middle wall 142, and the left side wall 141 were close.

[0057] For the system with the main oscillator linear springs installed with stiffnesses of 8500 N / m and 5000 N / m, within the lower resonance frequency band (frequency band range 3.6 - 4.2 Hz), the vibration state of the multi - vibration - mode vibration - absorbing superstructure is similar to that when the main oscillator linear spring with a stiffness of 14000 N / m is installed. It is the second vibration mode. The stiffness of the main oscillator linear spring only affects the amplitude and does not change the vibration law.

[0058] Similarly, for the main oscillator installed with linear springs of 8500 N / m and 5000 N / m, within the resonance frequency band range of 5.6 - 6.6 Hz, the multi - vibration - mode vibration - absorbing superstructure has two additional vibration modes. The first one is the third vibration mode where the displacement at the position of the middle wall panel 142 is the smallest, and the main oscillator and the mass block 5 drive the first to fourth unit cells to make reciprocating periodic motions towards the middle wall panel 142 simultaneously. The second one is the fourth vibration mode where the displacement at the position of the right - hand side wall panel 143 is the smallest, and the main oscillator and the mass block 5 drive the first to fourth unit cells to make reciprocating periodic motions towards the right - hand side wall panel 143 simultaneously. In the third and fourth vibration modes, the peak times generated by the right - hand side wall panel 143, the middle wall panel 142, and the left - hand side wall panel 141 are different, which is different from the second vibration mode.

[0059] Therefore, it can be concluded that the multi - vibration modes of the multi - vibration - mode vibration - absorbing superstructure include:

[0060] The first vibration mode: The displacement at the left - hand side wall panel 141 is the smallest, and the main oscillator and the mass block 5 drive the first to fourth unit cells to make reciprocating periodic motions towards the left - hand side wall panel 141 simultaneously;

[0061] The second vibration mode: The amplitudes of the right - hand side wall panel 143, the middle wall panel 142, and the left - hand side wall panel 141 increase gradually, and the amplitude of the mass block 5 is the largest;

[0062] The third vibration mode: The displacement at the middle wall panel 142 is the smallest, and the main oscillator and the mass block 5 drive the first to fourth unit cells to make reciprocating periodic motions towards the middle wall panel 142;

[0063] The fourth vibration mode: The displacement at the right - hand side wall panel 143 is the smallest, and the main oscillator and the mass block 5 drive the first to fourth unit cells to make reciprocating periodic motions towards the left - hand side wall panel 141 simultaneously. The fourth vibration mode is similar to the vibration mode of the second vibration mode, except that in the second vibration mode, the peak times generated by the main oscillator, the mass block 5, the right - hand side wall panel 143, the middle wall panel 142, and the left - hand side wall panel 141 are close, while in the fourth vibration mode, the peak times are different.

[0064] In summary, to overcome the technical problems in existing vibration absorbers, the present invention abandons the traditional design concept of vibration absorbers and proposes a multi-vibration mode non-smooth vibration absorption superstructure. This superstructure can generate different vibration modes with the change of external excitation, thereby realizing the control of broadband excitation. Moreover, since the superstructure itself is provided with multiple deformation constraint parts, the occurrence of sudden failure can be avoided.

Claims

1. A multi-vibration-mode non-smooth vibration-absorbing superstructure, characterized in that it includes a mass block (5) and periodic structures symmetrically located on both sides of the mass block (5), and the mass block and the periodic structures are connected by a first connecting rod (51); The periodic structure includes a plurality of identical unit cells, a first wall plate (13), a plurality of second wall plates (14), a third wall plate (15) and a baffle (6). A unit cell is arranged between adjacent two wall plates; each wall plate has a beam body (16) and protruding parts (12) located at both ends of the beam body (16). The protruding parts (12) are oppositely arranged and there is a certain distance between adjacent two protruding parts; the baffle (6) extends from the upper surface of the beam body (16) of the second wall plate (14) between the two centrally arranged unit cells and then extends towards the mass block (5). There is a certain distance between the opposite side walls of the baffles (6) of the two periodic structures. The protruding parts (12) and the baffle (6) are both used to apply displacement constraints, so that the periodic structure presents non-smooth stiffness characteristics; The first wall plate (13) and the third wall plate (15) are respectively located at both ends of the periodic structure, wherein the first wall plate (13) is close to the mass block (5), and the second wall plate (14) is located between the first wall plate (13) and the third wall plate (15); Moreover, the distance between the first wall plate (13) and the adjacent second wall plate (14) is not equal to the distance between the third wall plate (15) and the adjacent second wall plate (14), and the distances between adjacent second wall plates (14) are also not equal; Among them, from far to near the mass block (5) are the first unit cell (1), the second unit cell (2), the third unit cell (3) and the fourth unit cell (4); the unit cell is of I-shaped structure, including a centrally arranged unit cell mass block (11) and four completely identical slender curved beams (8). The length of the curved beam (8) is determined according to the stiffness requirement of the superstructure. One end of it is fixedly connected to the side wall of the unit cell mass block (11), and the other end is fixedly connected to the protruding part (12), and the curved beams (8) are arranged in pairs oppositely.

2. The multi-vibration-mode non-smooth vibration-absorbing superstructure according to claim 1, characterized in that the superstructure is integrally formed by 3D printing technology.

3. The multi-vibration-mode non-smooth vibration-absorbing superstructure according to claim 2, characterized in that the number of the second wall plates is 3, which are the left side wall plate (141) close to the mass block (5), the right side wall plate (143) farthest from the mass block (5), and the middle wall plate (142) located between the left side wall plate (141) and the right side wall plate (143); and the distance between the first wall plate (13) and the left side wall plate (141) < the distance between the left side wall plate (141) and the middle wall plate (142) < the distance between the middle wall plate (142) and the right side wall plate (143) < the distance between the right side wall plate (143) and the third wall plate (15).

4. The multi-vibration-mode non-smooth vibration-absorbing superstructure according to claim 3, characterized in that the superstructure has four vibration modes: The first vibration mode: The displacement at the left side wall panel (141) is the smallest, and the main oscillator and the mass block (5) drive the first to fourth unit cells to make reciprocating periodic motions towards the left side wall panel (141) simultaneously; The second vibration mode: The amplitudes of the right side wall panel (143), the middle wall panel (142), and the left side wall panel (141) increase gradually, and the amplitude of the mass block (5) is the largest; The main oscillator and the mass block (5) drive the first to fourth unit cells to make reciprocating periodic motions towards the right side wall panel (141) simultaneously, and the peak moments generated by the right side wall panel (143), the middle wall panel (142), and the left side wall panel (141) are close; The third vibration mode: The displacement at the middle wall panel (142) is the smallest, and the main oscillator and the mass block (5) drive the first to fourth unit cells to make reciprocating periodic motions towards the middle wall panel (142); The fourth vibration mode: The displacement at the right side wall panel (143) is the smallest, and the main oscillator and the mass block (5) drive the first to fourth unit cells to make reciprocating periodic motions towards the right side wall panel (143) simultaneously, and the peak moments generated by the right side wall panel (143), the middle wall panel (142), and the left side wall panel (141) are different.

5. The multi-vibration mode non-smooth vibration absorption superstructure according to claim 2, wherein the two ends of the protruding portion (12) of the second wall panel (14) extend out of the side wall of the beam body (16), and the ends of the protruding portions (12) of the first and third wall panels facing the second wall panel (14) also extend out of the side wall of the beam body (16).

6. The multi-vibration mode non-smooth vibration absorption superstructure according to claim 2, wherein the beam body (16) of the second wall panel (14) is provided with a groove along its longitudinal direction for weight reduction.

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