Floating breakwater with dangling structure

Abstract

The utility model belongs to the technical field of design and manufacture of offshore engineering equipment, and discloses a floating breakwater with a dangling structure, which comprises a floating breakwater main body structure with the dangling structure, a mooring system and a flexible connecting system. A main body structure of the floating breakwater with the dangling structure comprises a square box body, a dangling anchor chain, a dangling ball body, a connecting ring and a hanging ring connecting buckle. The mooring system is mainly composed of a mooring cable and an anchorage sinking block. The flexible connecting system is composed of a plurality of flexible connecting shafts. The floating breakwater can well solve the problems that the medium-long wave absorbing capacity of an existing floating breakwater is insufficient, and the wave absorbing performance is limited by the wave period. According to the research result, the optimized wave attenuation mechanism can effectively overcome the technical defects of a traditional floating breakwater, the wave energy of the specific wave band is efficiently attenuated, and the safety of open-sea structural engineering and offshore operation is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of design and manufacturing of near-shore engineering equipment and relates to a floating breakwater with a cantilever structure. Background Art

[0002] Breakwaters play a vital role in coastal and marine engineering. They protect coastlines, ports and offshore structures from erosion and damage caused by wave impact by effectively attenuating wave energy. In addition, breakwaters can maintain the stability of the waters and create safer conditions for ship mooring, navigation and operation activities. According to natural conditions and usage requirements, traditional breakwaters include upright, oblique wave, combined, etc., which usually have disadvantages such as large volume, heavy pollution and high cost. Compared with traditional fixed breakwaters, floating breakwaters have better adaptability, can adapt to different water depths, are easy to install and disassemble, and have better ecological characteristics and economy. Therefore, floating breakwaters are particularly widely used in projects with high requirements for ecology and construction conditions.

[0003] Lian Jijian and others published the research progress of floating breakwater structural types in January 2025, and systematically sorted out the structural types and wave dissipation principles of floating breakwaters at home and abroad. At present, the basic configurations of floating breakwaters include box type, pontoon type, raft type, frame type, tethered float type, horizontal plate type, wave energy utilization type, hybrid type and other innovative configurations. Among them, new floating breakwaters include resonance type, porous permeability type, ballast water type, multi-body coupled motion theory design type and flexible damping type. However, due to the strong penetration ability of medium and long waves on offshore structures, most of the floating breakwaters currently proposed can only achieve wave dissipation for medium and short period waves. Some structural forms can achieve wave absorption of medium and long waves. According to a high-efficiency floating breakwater based on a Helmholtz water wave resonance cavity proposed by Li Zhifu et al. (application publication number: CN117604972A), when the frequency of the incident wave matches the natural frequency of the liquid in the cavity, the water resonance can achieve vibration reduction and wave absorption of waves in a specific frequency band. However, it is difficult to design and adjust the natural frequency of the structure.

[0004] In the actual marine environment, offshore port structures are generally subject to the excitation of medium- and long-period waves of 10s or more. Since long-period waves have a larger wavelength, the reflection of the floating body is close to zero. At the same time, the long-wave energy is distributed in a large vertical range, and the vertical dissipative wave attenuation is complex and difficult to achieve. Therefore, studying a floating breakwater that can achieve medium- and long-period wave attenuation is of great significance to improving the safety and efficiency of deep-sea engineering structures and marine activities. At present, the study of wave attenuation based on the wave-structure resonance principle from an energy perspective is becoming a research hotspot in the field of medium- and long-wave wave attenuation control. Considering the limitations of the single-structure resonance on the wave attenuation frequency band, it is more practical to develop a self-regulating system that can achieve efficient wave attenuation in a specific period band by changing simple structural parameters.

[0005] The simple pendulum structure is a classic physical model. Ideally, the movement of the simple pendulum is a periodic movement caused by gravity and restoring force. Based on the principle of resonant frequency matching, it is widely used in engineering structures such as buildings and bridges or earthquake-resistant engineering. Introducing the simple pendulum structure into the design of the floating breakwater structure can change the resonance period of the overall structure by changing the pendulum length and the number of pendulum balls, thereby achieving active control and regulation of specific wave absorption frequency bands. Utility Model Content

[0006] In view of this, the purpose of the utility model is to design a floating breakwater with a mooring device and a pendulum structure, and to make the resonance frequency band of the floating breakwater with a pendulum structure consistent with the wave excitation frequency band by controlling the length of the single pendulum and the number of pendulum balls, so as to strengthen the wave damping of waves in a specific frequency band (the wave damping range is not limited, especially suitable for the wave damping of medium and long period waves), so as to achieve the best wave damping effect flexibly and controllably. The floating breakwater has a novel design and is easy to construct and maintain, and can be used in production and construction activities such as coastal ports, emergency wave damping for marine disaster prevention, marine aquaculture and marine engineering protection. Experiments have shown that within the full period range, the transmission coefficient of the floating breakwater is 2%-10% smaller than that of the traditional box-type floating breakwater, while the transmission coefficient of the existing floating breakwater structure is reduced by about 10%-20% in the full period relative to the traditional box-type floating breakwater. Although the present structure has no advantage in wave dissipation within the full period range, the transmission coefficient of the structure in the specific period wave (resonance period wave) is 20%-35% smaller than that of the traditional box-type floating breakwater, and 10%-20% smaller than that of the fixed breakwater. Therefore, the wave dissipation efficiency of the structure applied to the specific period range is much higher than that of the existing floating breakwater structure. The utility model, a floating breakwater with a pendulum structure, plays a good optimization role in the wave dissipation effect of the traditional box-type floating breakwater on the specific period wave (resonance period wave), and realizes high-performance wave dissipation of the specific period wave (resonance period wave) based on the wave-structure resonance principle.

[0007] The technical solution of this utility model:

[0008] A floating breakwater with a cantilever structure, comprising a main structure of the floating breakwater with a cantilever structure, a mooring system and a flexible connection system;

[0009] The main structure of the floating breakwater with a pendulum structure includes a square box, a pendulum anchor chain, a pendulum ball, a connecting ring and a lifting ring connecting buckle; two connecting rings are movably connected to the bottom surface of the square box and the midpoints of both sides respectively; two lifting ring connecting buckles are solid semicircular ring structures, movably connected to the upper part of the pendulum ball, and used for movably connecting the pendulum anchor chain; two pendulum anchor chains, one end of which is movably connected to the connecting ring, and the other end is movably connected to the lifting ring connecting buckle;

[0010] The mooring system is mainly composed of a mooring cable and an anchor sinker, one end of the mooring cable is movably connected to the corner end of the square box, and the other end is movably connected to the anchor sinker; the main structure of each floating breakwater with a cantilever structure is moored separately by a corresponding mooring system, and the mooring system is movably connected to the structural surface of the square box facing the waves and the back of the waves;

[0011] The flexible connection system is composed of a plurality of flexible connection shafts. The main structure of the floating breakwater with a pendulum structure is anchored to the flexible connection shafts, and both ends of each flexible connection shaft are respectively anchored at the center position of the side section of the main structure of the floating breakwater with a pendulum structure. The flexible connection system laterally arranges and flexibly connects the main structures of a plurality of adjacent floating breakwaters with a pendulum structure.

[0012] Furthermore, the center of gravity distribution plays a key role in the resonance period of the main structure of the floating breakwater with a pendulum structure. When the center of gravity is close to the square box, there is no obvious regularity between the natural frequency of the main structure of the floating breakwater with a pendulum structure and the natural frequency of the simple pendulum; when the center of gravity gradually approaches the pendulum sphere, the resonance frequency of the floating breakwater gradually approaches the natural frequency of the simple pendulum. It has been verified experimentally that the relationship between the mass M1 of the square box and the mass M2 of the pendulum sphere must satisfy: M2 ≥ 1.27M1;

[0013] When the mass M1 of the square box and the density ρ of the pendulum material are known, the inequality relationship that the radius R of the pendulum, the mass M1 of the square box and the density ρ of the pendulum material should satisfy is:

[0014] Furthermore, the floating breakwater with a pendulum structure achieves wave dissipation by adding a vertical auxiliary pendulum sphere. Based on the resonance principle, the natural frequency of the floating breakwater is controlled by changing the structural design of the lower hanging single pendulum. When the main structure of the floating breakwater with a pendulum structure is in a natural hanging state, the extension lines of the two pendulum anchor chains pass through the center of the sphere. In the main structure of the floating breakwater with a pendulum structure, X is the length of the square box structure, H is the distance from the bottom of the square box to the center of the pendulum sphere, R is the radius of the pendulum sphere, and L is the length of the pendulum anchor chain. The relationship can be expressed as:

[0015] By changing the length of the pendulum anchor, the period range of the waves eliminated by the floating breakwater with a pendulum structure can be controlled. In practical applications, for wave elimination in a specific sea area, when the length of the pendulum anchor chain is L, the optimal wave elimination period T that can be achieved by the utility model is (the natural frequency of the single pendulum underwater is close to the ideal single pendulum frequency):

[0016] Furthermore, the main structures of a plurality of floating breakwaters with pendulum structures connected by flexible connecting shafts are arranged in parallel perpendicular to the wave propagation direction.

[0017] Furthermore, a single pendulum sphere is suspended below the main structure of each individual floating breakwater with a pendulum structure, and the pendulum anchor chains connected to the pendulum spheres are of the same length.

[0018] Furthermore, a plurality of pendulum spheres are suspended below the main structure of each individual floating breakwater with a pendulum structure, the pendulum anchor chains connected to each pendulum sphere are set with different lengths, and the vertically suspended pendulum spheres can swing freely, and the motion trajectories of adjacent pendulum spheres are independent.

[0019] Furthermore, the lifting ring connecting buckle is a solid semicircular ring structure, which is movably connected to the upper part of the pendulum sphere and is used to connect the suspended pendulum anchor chain.

[0020] Furthermore, the connecting ring is a solid semicircular ring structure, the square box is a hollow structure, and the pendulum sphere is a solid structure; the connection between the square box and the pendulum anchor chain and mooring system is sealed and waterproof.

[0021] Furthermore, the square box is made of steel or concrete, the pendulum ball is made of metal material, the suspension anchor chain and mooring cable are made of high-strength steel or stainless steel, and the anchor sinker is made of high-strength and highly corrosion-resistant concrete, steel or cast iron.

[0022] According to the current floating breakwater structure types at home and abroad, the box-type floating breakwater is the most widely used configuration, but the improvement of its performance mainly depends on increasing the structural size. Since the structural size, water depth and draft have a great influence on the structural wave-breaking performance, this experiment only compares and analyzes the wave-breaking performance of the floating breakwater of the utility model with the traditional box-type floating breakwater of the same structural design, water depth and draft. The existing floating breakwater structure has a transmission coefficient reduction range of 10%-20% compared with the traditional box-type floating breakwater in the full cycle. In a possible embodiment, within the full cycle range, the transmission coefficient of the floating breakwater is 2%-10% smaller than that of the traditional box-type floating breakwater, and the transmission coefficient in a specific period wave (resonant period wave) is 20%-35% smaller than that of the traditional box-type floating breakwater, and 10%-20% smaller than that of the fixed breakwater. The utility model discloses a floating breakwater with a cantilever structure, which optimizes the wave-breaking effect of a traditional box-type floating breakwater. In particular, based on the wave-structure resonance principle, it can achieve high-performance wave breaking of specific period waves (resonance period waves), which is higher than the wave breaking efficiency of the floating breakwater structure in existing research.

[0023] In a possible embodiment, the wave-breaking principle of the utility model is as follows: the single pendulum structure is designed to control the overall motion state of the main structure. Based on the wave-dike structure resonance principle, under the periodic excitation of external waves, the main structure resonates in a specific band and swings greatly to disrupt the motion of water particles, destroy the wave energy field around the breakwater and form a vortex to dissipate energy. At the same time, part of the wave energy is reflected, and part of the wave energy is absorbed by the pendulum sphere and converted into pendulum mechanical energy, further consuming the overall energy, achieving efficient wave breaking of waves in a specific period range.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1) The existing floating breakwater structure has insufficient wave dissipation capacity for medium and long waves. The floating breakwater structure proposed by the utility model by suspending a single or multiple pendulum spheres can achieve efficient wave dissipation for waves in a specific wave band. Under the excitation of waves in a specific period range, due to the resonance effect, the floating breakwater moves violently, causing water turbulence and hindering wave propagation. At the same time, the wave energy is dissipated by generating a large number of vortices, limiting the further propagation of the wave.

[0026] 2) For a small number of structures that achieve medium and long wave absorption based on the resonance principle, most of them require complex design and adjustment of the embankment structure to adapt to the wave absorption band. It is difficult to achieve system resonance to achieve specific wave absorption in a simple adjustment method, and the flexibility is poor. The pendulum length of the floating breakwater can be arbitrarily adjusted by referring to the single pendulum formula without affecting the free movement of multiple pendulum spheres to achieve corresponding frequency band absorption. The optimal wave absorption period range of the system structure is self-controllable, and simple adjustment of the structure according to the wave absorption requirements can achieve high-performance wave absorption for specific wave frequencies.

[0027] 3) The utility model provides a floating breakwater with a cantilever structure that is not affected by environmental factors such as water depth, seabed conditions, tidal changes, etc., has a low construction cost, and is easy to install and maintain.

[0028] The utility model provides a floating breakwater with a cantilever structure, which can effectively solve the problems of insufficient medium and long wave absorption capacity and wave absorption performance being limited by wave period in current floating breakwaters. According to research results, the optimized wave attenuation mechanism can effectively overcome the technical defects of traditional floating breakwaters, efficiently attenuate the wave energy in specific wave bands (including medium and long period wave bands), and improve the safety of offshore structural engineering and offshore operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the main structure of a floating breakwater with a cantilever structure proposed in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of a wave-facing cross-section of a main structure of a floating breakwater with a cantilever structure proposed in an embodiment of the present application;

[0031] Figure 3 A schematic side cross-sectional view of the main structure of a floating breakwater with a cantilever structure proposed in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of a top view of the main structure of a floating breakwater with a cantilever structure proposed in an embodiment of the present application;

[0033] Figure 5 A schematic cross-sectional view of the general assembly of a floating breakwater with a cantilever structure and a single pendulum system on the wave-facing side thereof proposed in an embodiment of the present application;

[0034] Figure 6 A schematic cross-sectional view of the general assembly of a floating breakwater with a cantilever structure and a multi-pendulum system on the wave-facing side thereof proposed in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of a floating breakwater with a pendulum structure and a multi-pendulum system structure thereof proposed in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of mass distribution of a floating breakwater box ball with a pendulum structure proposed in an embodiment of the present application;

[0037] Fig. 9 This is a result analysis diagram of the transmission coefficient of a floating breakwater with a cantilever structure under different center of gravity distributions proposed in an embodiment of the present application;

[0038] Fig.10 This is a result analysis diagram of the transmission coefficient of a floating breakwater with a pendulum structure under different pendulum lengths proposed in an embodiment of the present application;

[0039] Fig.11 This is a result analysis diagram of the transmission coefficient of a floating breakwater with a pendulum structure under double pendulums proposed in an embodiment of the present application;

[0040] Fig.12 A schematic diagram of parameters of a floating breakwater with a cantilever structure and a system catenary model proposed in an embodiment of the present application;

[0041] In the figure: 1 main structure; 2 mooring system; 3 flexible connection system; 11 square box; 12 hanging anchor chain; 13 connecting ring; 14 pendulum ball; 15 lifting ring connecting buckle; 21 mooring cable; 22 anchor sinker; 31 flexible connection shaft. DETAILED DESCRIPTION

[0042] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings and technical solutions.

[0043] Example 1

[0044] like Figure 1 As shown, the utility model provides a floating breakwater with a pendulum structure, a main structure 1, a mooring system 2 and a flexible connection system 3; the main structure 1 includes a square box 11, a pendulum anchor chain 12, a connecting ring 13, a pendulum ball 14 and a lifting ring connecting buckle 15, the mooring system 2 includes a mooring cable 21 and an anchor sinker 22, and the flexible connection system 3 includes a flexible connection shaft 31;

[0045] The square box 11, the pendulum sphere 14 and the pendulum anchor chain 12 are movably connected through the connecting ring 13 and the lifting ring connecting buckle 15, and together constitute the main structure 1 of the floating breakwater with a pendulum structure; each main structure 1 of the floating breakwater with a pendulum structure is moored separately by the corresponding mooring system 2, and the main structures 1 of two adjacent separate floating breakwaters with a pendulum structure are movably connected by the flexible connection system 3.

[0046] The mooring system model is arranged according to the catenary equation, and the chain length and the coordinates of the contact point between the anchor chain and the bottom are calculated according to the following formula:

[0047] 2zS=(S 2 -z 2 )tanθ

[0048]

[0049] Where: z is the vertical length of the mooring line, x is the horizontal length of the mooring line, S is the total length of the mooring line, and θ is the angle between the tangent direction of the tension at a certain point and the horizontal direction.

[0050] A regular wave physical experiment was carried out on the floating breakwater. The experimental water depth was 1.3m. The draft of the breakwater was kept at 0.12m in all working conditions. The experimental wave height was 0.08m. The wave period was 0.9s-2.2s. The ratio of the width of the square box 11 to the wavelength, B / L, ranged from 0.078 to 0.396.

[0051] Example 2

[0052] By adjusting the distribution of the counterweight between the square box 11 and the pendulum sphere 14 to change the center of gravity distribution, the box-ball mass relationship that can achieve the wave-breaking effect at the resonance moment is explored. Set up a non-ball-fixed breakwater and a non-ball-traditional floating breakwater as control group 1 and control group 2 respectively; the adjustable counterweight is completely added to the square box 11, and additional lead weight is added to the pendulum sphere 14 only to balance its underwater buoyancy as working condition 1; the adjustable counterweight is reduced by 1 / 3 from the square box 11 and added to the pendulum sphere 14 as working condition 2; the adjustable weight is reduced by 2 / 3 from the square box 11 and added to the pendulum sphere 14 as working condition 3; the adjustable counterweight is completely added to the pendulum sphere 14 as working condition 4; the distribution relationship of the counterweight between the box and the ball is as follows Figure 8 As shown. Taking the system resonance period of 1.8s as an example, the transmission coefficient K under different center of gravity distributions t The results of the change with the incident wave period T are as follows Fig. 9 As shown. The results show that as the counterweight is transferred from the square box 11 to the pendulum sphere 14, the center of gravity gradually moves downward, and the transmission coefficient shows a trend of gradually decreasing, but the effect is small. When the mass M1 of the square box 11 and the mass M2 of the pendulum sphere 14 reach M2=1.27M1 (working condition 4), the resonance period of the floating breakwater is close to the single pendulum period, and the transmission coefficient drops sharply near the single pendulum resonance period, reaching a minimum of 0.65, and the decline range is within 0.1s before and after the single pendulum resonance period. Compared with the traditional box-type floating breakwater, the maximum decrease is nearly 0.3, which is close to the transmission coefficient of the traditional box-type floating breakwater under short periods; compared with the fixed breakwater, the maximum decrease is nearly 0.2, and the wave-breaking effect is significant.

[0053] Example 3

[0054] The relationship between the pendulum length and the wave elimination period is explored by changing the pendulum length of the pendulum sphere 14. The research is continued on the basis that the relationship between the mass M1 of the square box and the mass M2 of the pendulum sphere satisfies M2=1.27M1 (working condition 4). The same control group 1 and control group 2 are set up. According to the relationship between the period of the single pendulum model and the pendulum length, four sets of pendulum lengths are set. The pendulum length of 0.8m corresponds to a resonance period of 1.8s, the pendulum length of 0.64m corresponds to a resonance period of 1.6s, the pendulum length of 0.55m corresponds to a resonance period of 1.5s, and the pendulum length of 0.36m corresponds to a resonance period of 1.2s. The transmission coefficient K under different pendulum lengths t The results of the change with the incident wave period T are as follows Fig.10 As shown. The experimental results show that, since the system resonance frequency is close to the single pendulum frequency, the transmission coefficient of the floating breakwater under the four pendulum lengths shows a significant decrease near its single pendulum resonance period, and the downward trend is about 0.1s-0.18s before and after the single pendulum resonance period. When the single pendulum resonance period is 1.8s, the corresponding wave-breaking period T ranges from [1.7s, 1.83s], when the single pendulum resonance period is 1.6s, the corresponding wave-breaking period T ranges from [1.5s, 1.78s], when the single pendulum resonance period is 1.5s, the corresponding wave-breaking period T ranges from [1.45s, 1.63s], and when the single pendulum resonance period is 1.2s, the corresponding wave-breaking period T ranges from [1.05s, 1.32s]. Compared with the traditional box-type floating breakwater, the reduction coefficient of each group of working conditions is 0.3-0.35, and compared with the fixed breakwater, the reduction coefficient is 0.08-0.2. In addition, the utility model has a certain degree of wave-absorbing effect on waves in the entire cycle range (including non-resonant cycles).

[0055] Example 4

[0056] Set up a double pendulum model and conduct experiments with a double ball combination with pendulum lengths of 0.8m and 0.55m (corresponding to natural periods of 1.8s and 1.5s), and the masses of the two balls are M3=M4=0.5M2. Fig.11 The experimental results show that under the action of non-resonant wave cycles, the transmission coefficient variation trends of the double pendulum ball structure and the single pendulum ball structure are similar, and the magnitudes are between the fixed breakwater and the traditional floating breakwater. Since the single pendulum resonance period of the two balls is similar, in the resonance period range, the transmission coefficient of the double pendulum ball structure shows an overall downward trend within the resonance period range of the two balls [1.5s, 1.8s]. Compared with the single pendulum ball structure, the double pendulum ball structure has a wider range of wave periods for reducing the transmitted wave, and has higher controllability and applicability. However, possibly due to the influence of the center of gravity distribution, the ability of the double pendulum ball structure to reduce the transmitted wave is weaker than that of the single pendulum ball structure.

[0057] The wave-breaking principle of the utility model is as follows: the main structure is designed according to the relationship between the mass distribution and the resonance period and the pendulum length in the simple pendulum model. Based on the wave-dike structure resonance principle, under the excitation of external waves of a specific period (resonance period), the main structure 1 resonates with the wave environment and produces a large swing to disrupt the motion of water particles, destroy the wave energy field around the breakwater and form a vortex to dissipate energy. At the same time, part of the wave energy is reflected, and part of the wave energy is absorbed by the pendulum sphere 14 and converted into pendulum mechanical energy, further enhancing the dissipation of the incident wave. The utility model is a floating breakwater with a suspended pendulum structure that can significantly reduce the height of the transmitted wave and achieve efficient wave breaking of waves within a specific period range.

[0058] The utility model discloses a floating breakwater with a pendulum structure, which can well solve the problem that the wave dissipation performance of the current floating breakwater is limited by the wave period, and realizes high-performance wave dissipation for waves of a specific period. The transmission coefficient of the floating breakwater in waves of a specific period is 20%-35% smaller than that of the traditional box-type floating breakwater, and 10%-20% smaller than that of the fixed breakwater. According to the research results, the optimized wave attenuation mechanism can effectively overcome the technical defects of the traditional floating breakwater, and efficiently realize its attenuation effect for long-period waves.

[0059] The utility model has a simple structural configuration, novel design, low construction cost, and convenient installation and maintenance. At the same time, water can be exchanged inside and outside the breakwater, effectively preventing siltation problems in the port and having little impact on the marine ecological environment. It can be used in production and construction activities such as coastal ports, maritime disaster prevention and emergency wave elimination, marine aquaculture, and marine engineering protection.

[0060] The above is only a preferred specific implementation of the present application, but the present invention is not limited thereto. The above specific implementation is only illustrative and instructive, not restrictive. Any technician familiar with the technical field of the present invention can make many forms under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, which should all be included in the scope of protection of the present application.

Claims

1. A floating breakwater with a cantilever structure, characterized in that: The floating breakwater comprises: a main structure of the floating breakwater with a cantilever structure, a mooring system and a flexible connection system; The main structure of the floating breakwater with a pendulum structure includes a square box, a pendulum anchor chain, a pendulum sphere, a connecting ring and a lifting ring connecting buckle; two connecting rings are movably connected to the bottom surface of the square box and the midpoint of both sides respectively; two lifting ring connecting buckles are solid semicircular ring structures, movably connected to the upper part of the pendulum sphere, and used for movably connecting the pendulum anchor chain; two pendulum anchor chains, one end of which is movably connected to the connecting ring, and the other end is movably connected to the lifting ring connecting buckle; multiple main structures of the floating breakwater with a pendulum structure connected by a flexible connecting shaft are arranged in parallel perpendicular to the wave propagation direction; The mooring system is mainly composed of a mooring cable and an anchor sinker, one end of the mooring cable is movably connected to the corner end of the square box, and the other end is movably connected to the anchor sinker; the main structure of each floating breakwater with a cantilever structure is moored separately by a corresponding mooring system, and the mooring system is movably connected to the structural surface of the square box facing the waves and the back of the waves; The flexible connection system is composed of a plurality of flexible connection shafts, the main structure of the floating breakwater with a pendulum structure is anchored to the flexible connection shafts, and both ends of each flexible connection shaft are anchored to the center of the side section of the main structure of the floating breakwater with a pendulum structure; the flexible connection system arranges and flexibly connects the main structures of a plurality of adjacent floating breakwaters with a pendulum structure in a transverse arrangement; The relationship between the mass M1 of the square box and the mass M2 of the pendulum sphere must satisfy: M2 ≥ 1.27M1; when the mass M1 of the square box and the material density ρ of the pendulum sphere are known, the inequality relationship that the radius R of the pendulum sphere, the mass M1 of the square box and the material density ρ of the pendulum sphere should satisfy is obtained as follows:

2. The floating breakwater according to claim 1, characterized in that: When the main structure of the floating breakwater with a pendulum structure is in a naturally suspended state, the extension lines of the two pendulum anchor chains pass through the center of the sphere; in the main structure of the floating breakwater with a pendulum structure, X is the length of the square box, H is the distance from the bottom of the square box to the center of the pendulum sphere, R is the radius of the pendulum sphere, and L is the length of the pendulum anchor chain, and the relationship is expressed as follows: By changing the length of the suspended anchor chain, the period range of the floating breakwater's wave dissipation can be controlled; When the length of the suspended anchor chain is L, the optimal wave absorption period T is determined as:

3. The floating breakwater according to claim 1, characterized in that: A single pendulum sphere is suspended below the main structure of each individual floating breakwater with a pendulum structure, and the pendulum anchor chains connected to the pendulum spheres have the same length.

4. The floating breakwater according to claim 1, characterized in that: A plurality of pendulum spheres are suspended below the main structure of each individual floating breakwater with a pendulum structure. The pendulum anchor chains connected to each pendulum sphere are set with different lengths. The vertically suspended pendulum spheres can swing freely, and the motion trajectories of adjacent pendulum spheres are independent.

5. The floating breakwater according to claim 1, characterized in that: The square box is a hollow structure, and the pendulum sphere is a solid structure; the connection between the square box and the pendulum anchor chain and the mooring system is sealed and waterproof.

6. The floating breakwater according to claim 1, characterized in that: The square box is made of steel or concrete, the pendulum ball is made of metal material, the suspension anchor chain and mooring cable are made of high-strength steel or stainless steel, and the anchor sinker is made of high-strength and highly corrosion-resistant concrete, steel or cast iron.

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