Wave-rider aircraft capable of going in and out of water repeatedly and combat method

Abstract

According to the waverider aircraft capable of repeatedly getting in and out of the water, the unique waverider appearance is adopted to achieve cross-medium getting in and out of the water, the hydrodynamic performance in the air and the hydrodynamic performance in the water are optimized, and conversion of the aircraft in the air and the hydrodynamic performance in the water is achieved; by penetrating through the water surface at a small angle, the axial load is remarkably reduced, so that the aircraft can frequently enter and exit from water under low thrust, and the rapid deployment and variable tactical requirements are met; due to the special ballistic trajectory design and operation skills, the aircraft can effectively avoid conventional sonar and radar detection when approaching the sea level; radar reflection is reduced by using sea clutter, sea surface fluctuation and medium change, and electronic interference equipment is used, so that the survivability of the device in a complex battlefield environment is enhanced; in combination with a green hydroxylamine nitrate engine and an underwater magnetofluid propeller, it is ensured that the aircraft can efficiently and rapidly move in different media, meanwhile, the aircraft is kept silent when necessary, and the aircraft is not prone to being detected by a target.

Description

Technical Field

[0001] The invention belongs to the technical field of weapon equipment, and in particular relates to a waverider vehicle capable of repeatedly entering and exiting water and a combat method. Background Art

[0002] Strengthen scientific and technological empowerment, strengthen naval power and conditions, and build a multi-dimensional naval defense control system. Aircraft carriers will remain the core of maritime military power for a certain period of time in the future. Their air defense system is very sound, forming a three-dimensional space defense system with long, medium and short coverage, high, medium and low matching. In addition, new terminal anti-missile weapons such as laser weapons and electromagnetic guns developed in recent years have further strengthened their maritime defense capabilities.

[0003] At present, there are many means to counter aircraft carrier formations: high-altitude strikes by ballistic missiles, saturation attacks by anti-ship missiles, hidden ambushes by submarines, sieges by drone swarms and speedboat swarms, etc. Although these strategies can cause significant damage to aircraft carriers, the specific effects are difficult to predict and the cost is high. Therefore, a new type of aircraft with a waverider design is proposed, which optimizes the performance in a multi-media environment and can efficiently perform multiple transitions between the surface and the air with minimal energy consumption. Its unique small-angle water entry design significantly reduces the axial load and enhances maneuverability, giving it a key advantage in rapid deployment of reconnaissance missions. When performing integrated reconnaissance and strike combat missions, the aircraft uses its unique ballistic trajectory and operation mode close to the sea level to effectively evade conventional sonar and radar detection, maintain extremely high concealment, and demonstrate outstanding tactical advantages.

[0004] In modern warfare, several high-cost strategies are often used to counter aircraft carrier formations. These include the use of high-altitude ballistic missiles for strikes, which, while highly accurate and explosive, is expensive and easily intercepted by the target's missile defense system. Another strategy is saturation anti-ship missile attacks, which attempt to break through the target's air defense system by launching a large number of missiles. Although this increases the possibility of breaking through the defense, the economic cost is huge, and the close defense systems and electronic warfare equipment of modern aircraft carriers can effectively resist these attacks. Submarine ambushes are also an option, which can approach aircraft carrier formations for assaults, but the risk is extremely high. Once discovered, submarines are extremely vulnerable to counterattacks. In addition, the use of drone swarms and speedboat swarms for joint sieges is less expensive, but these units have limited firepower and are difficult to cause serious damage to large aircraft carriers, and are easily effectively shot down by the air defense systems of aircraft carrier formations. Although these methods can cause some damage, the specific effects are difficult to predict, and the costs and risks are relatively high. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a waverider aircraft and a combat method that can repeatedly enter and exit water. The aircraft adopts a waverider shape design and optimizes the performance of the aircraft in water and air, so that it can effectively switch from water surface to air multiple times with the lowest energy consumption. This design feature not only improves energy efficiency, but also increases operational flexibility and concealment.

[0006] The small angle of entry of the vehicle into the water helps to significantly reduce the axial load and enhance maneuverability. This design allows the vehicle to be quickly deployed when performing reconnaissance missions, which has obvious tactical advantages. In addition, its entry and exit operations are extremely concealed, which can effectively avoid detection by conventional sonar and radar when performing combat missions.

[0007] In combat applications, the aircraft not only provides extremely high concealment through its unique ballistic trajectory and operation close to sea level, but also allows it to enter the battle zone without being detected by the target defense. This allows the aircraft to demonstrate its unique tactical advantages in modern naval battles, especially when dealing with highly defensive aircraft carrier formations. The design concept and combat application of this aircraft marks an important direction for the advancement of modern military tactics and technology.

[0008] The present invention discloses a waverider vehicle capable of repeatedly entering and exiting water, comprising a main body structure having a waverider appearance, a hydroxylamine nitrate propulsion system (1), a foldable tail wing (2), a warhead (3), a flexible hydrofoil (4) and a magnetic fluid underwater propulsion system (5);

[0009] Wherein, the warhead (3) is arranged at the head of the aircraft body structure;

[0010] Two foldable tail wings (2) are symmetrically arranged on the upper surface of the tail of the main body structure, and their angles can be adjusted as needed in different flight stages;

[0011] The hydroxylamine nitrate propulsion system (1) is arranged at the tail of the body structure;

[0012] The magnetic fluid underwater propulsion system (5) is arranged at the belly position of the main body structure;

[0013] Two flexible hydrofoils (4) are symmetrically arranged on both sides of the tail of the main body structure and are installed on the main body structure through a connecting rod structure. When the aircraft is flying in the air, the two flexible hydrofoils (4) are retracted to the lower surface of the tail of the main body structure and can be turned up and unfolded when needed under the drive of the connecting rod mechanism. The turning and unfolding angles can be adjusted according to needs.

[0014] Preferably, the flexible hydrofoil (4) adopts a bionic manta ray pectoral fin structure.

[0015] Preferably, the lower surface of the head of the main body structure is located at a titanium alloy reinforcement area (6).

[0016] Preferably, the upper surface of the aircraft body structure adopts a manta ray-like bionic design.

[0017] A method for operating a waverider vehicle capable of repeatedly entering and exiting water, comprising:

[0018] 1) launching a plurality of the above-mentioned spacecraft, which, with the help of rockets, reach the target area and perform atmospheric entry and exit operations, during which they perform semi-ballistic aerodynamic deceleration; when reaching a specified altitude, their speed will drop to a speed greater than the water entry speed;

[0019] 2) When the vehicle reaches the target, it starts to glide in the air to reduce the speed to below 700m / s, meeting the water entry angle and speed requirements;

[0020] 3) The navigation body changes the angle and trajectory of the aircraft through the control surface of the foldable tail wing (2) so that the angle of entry into the water is guaranteed to be 15°; the aircraft enters the water and begins to enter and exit the water multiple times with the help of the waverider shape, and decelerates during this stage;

[0021] 4) After the speed of the navigation body decreases to a level that is insufficient to support the vehicle to leave the water again, the navigation mode is started, and the flexible hydrofoil (4) is opened through a mechanical connecting rod device; the flexible hydrofoil (4) is used to adjust the depth and change the direction of the vehicle underwater; and the magnetic fluid underwater propulsion system (5) provided with underwater navigation power;

[0022] 5) The vehicle lurks in the target sea area. When a target ship passes by, it approaches the target and launches an attack, thus achieving the combat goal of integrated reconnaissance and strike.

[0023] Ideally, the spacecraft speed will be reduced to 2Ma-3Ma.

[0024] A combat method for a waverider vehicle capable of repeatedly entering and exiting water, comprising:

[0025] 1) Launch the spacecraft, which will reach the target area with the help of rocket propulsion and enter and exit the atmosphere. During this stage, semi-ballistic aerodynamic deceleration will be performed. When reaching the specified altitude, the speed will drop to 2Ma-3Ma;

[0026] 2) Arrive outside the target's air defense circle and start gliding in the air to slow down, so that the speed can drop below 700m / s to meet the water entry angle and speed requirements;

[0027] 3) The trajectory and water entry angle of the aircraft are controlled by controlling the rudder surface of the foldable tail wing (2) to ensure that the water entry angle is 15 degrees; when the aircraft is 20 km away from the target, it enters the water and exits the water with the help of the waverider shape. After exiting the water, the water entry angle is adjusted with the help of the rudder surface to ensure that the angle of each entry is an appropriate angle, so as to achieve multiple entry and exit;

[0028] 4) When the vehicle is 5 km away from the target, it dives into the water and opens the flexible hydrofoil (4) to achieve underwater navigation;

[0029] 5) When approaching the target underwater defense circle, the flexible hydrofoil (4) is folded, the thrust of the magnetohydrodynamic propulsion system is used to make the vehicle out of the water, and the hydroxylamine nitrate engine is used for the final air acceleration to hit the target waterline, and the multiple superposition effects of explosion and cavitation generation are used to maximize the combat effectiveness.

[0030] The present invention has the following beneficial effects:

[0031] The invention provides a waverider vehicle capable of repeatedly entering and exiting water. The waverider vehicle adopts a unique waverider shape to achieve cross-medium entry and exit, optimizes the fluid dynamics performance in air and water, and realizes the conversion of the vehicle in air and water. The vehicle penetrates the water surface at a small angle to significantly reduce the axial load, so that the vehicle can frequently enter and exit the water at a relatively low thrust, adapting to rapid deployment and changing tactical requirements. The special ballistic trajectory design and operation skills enable the vehicle to effectively avoid conventional sonar and radar detection when approaching the sea level. The vehicle utilizes sea clutter, sea surface fluctuations, and medium changes to reduce radar reflection, and uses electronic jamming equipment to enhance its survivability in complex battlefield environments. The green hydroxylamine nitrate engine and underwater magnetohydrodynamic propulsion device are combined to ensure that the vehicle can move efficiently and quickly in different media, and keep silent when necessary, making it difficult to be detected by the target. Compared with existing strike means, the present solution is closer to the water surface, performs motion conversion between air and water, and can effectively avoid sonar and radar detection. In addition, the wave-shaped trajectory increases its strike difficulty, and the trajectory cannot be accurately predicted, making it difficult to destroy the vehicle of the present invention. When the anti-submarine measures of the terminal target begin to counter, the aircraft of the present invention protrudes from the water surface and accelerates at the terminal end to achieve the maximum destructive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Fig. 1(a), Fig. 1(b), Fig. 1(c), Fig. 1(d), Fig. 1(e), and Fig. 1(f) are schematic diagrams of the structure of a waverider vehicle capable of repeatedly entering and exiting water at different angles provided by the present invention;

[0033] Figure 2 A cross-sectional view of a waverider vehicle capable of repeatedly entering and exiting water provided by the present invention;

[0034] Figure 3 It is a schematic diagram of the cross-medium penetration scheme of the aircraft of the present invention;

[0035] Figure 4 In order to obtain the trajectory of the vehicle during the water skipping process based on the simulation results and the vehicle dynamics equation.

[0036] Figure 5 (a), (b), and (c) are the cloud images of the aircraft entering the water at angles of 10°, 15°, and 20°, respectively, when the aircraft speed is 600 m / s;

[0037] FIG6 is a stress cloud diagram of the waverider vehicle when the water entry angles are 25°, 20°, 10° and 15° respectively;

[0038] Figure 7(a) is the axial angular velocity curve of the spacecraft at different water entry angles; Figure 7(b) is the axial acceleration curve of the spacecraft at different water entry speeds; Figure 7(c) is the radial acceleration curve of the spacecraft at different water entry speeds; Figure 7(d) is the velocity change curve of the waverider spacecraft at different angles perpendicular to the water surface;

[0039] Figure 8 This is a sketch of the manta ray fin skeleton (He et al., 2020);

[0040] Fig. 9 It is a cross spring axis structure (He et al., 2020);

[0041] Fig.10 It is a bionic manta ray flapping wing mechanical structure (Cai et al., 2019a).

[0042] Among them, 1-hydroxylamine nitrate propulsion system, 2-foldable tail fin, 3-warhead, 4-flexible hydrofoil, 5-magnetohydrodynamic underwater propulsion system, 6-titanium alloy reinforcement area. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0044] The present invention provides a waverider vehicle that can repeatedly enter and exit water, as shown in Figures 1(a), (b), (c), (d), (e), and (f), comprising a main body structure having a waverider appearance, a hydroxylamine nitrate propulsion system 1, a foldable tail wing 2, a warhead 3, a flexible hydrofoil 4, and a magnetic fluid underwater propulsion system 5;

[0045] Wherein, the warhead 3 is arranged at the head of the aircraft body structure;

[0046] Two foldable tail wings 2 are symmetrically arranged on the upper surface of the tail of the main body structure to improve the stability and maneuverability of the aircraft in the air. At the same time, their angles can be adjusted as needed in different flight stages to adapt to various flight conditions;

[0047] The hydroxylamine nitrate propulsion system 1 is arranged at the tail of the body structure, and is mainly used to provide thrust for the aircraft in the air phase;

[0048] The magnetic fluid underwater propulsion system 5 is arranged at the belly of the body structure, and is mainly used to provide power for the underwater navigation of the vehicle;

[0049] The lower surface of the head of the main body structure is a titanium alloy reinforcement area 6.

[0050] The upper surface of the aircraft's main structure adopts a bionic design similar to that of a manta ray, which can effectively protect the aircraft.

[0051] Two flexible hydrofoils 4 are symmetrically arranged on both sides of the tail of the main body structure and are installed on the main body structure through a connecting rod structure. When the aircraft is flying in the air, the two flexible hydrofoils 4 are retracted to the lower surface of the tail of the main body structure and can be flipped and unfolded upwards when needed by the connecting rod mechanism. The flipping and unfolding angles can be adjusted as needed. The flexible hydrofoils 4 are used to enhance the stability and maneuverability of the aircraft in the water. Especially in high-speed navigation or complex sea conditions, by adjusting the angle and posture of the hydrofoils, the floating and sinking movements and steering capabilities of the aircraft can be effectively controlled, thereby optimizing navigation efficiency and safety.

[0052] For the flexible hydrofoil 4 of the present invention, an existing bionic manta ray pectoral fin structure can be used. The structural type of the mechanical pectoral fin parallel to the leading edge of the pectoral fin is divided according to the pectoral fin muscle characteristics of the manta ray, and this type of mechanism follows the structural characteristics of the real manta ray. He et al. from Northwestern Polytechnical University designed a new bionic manta ray pectoral fin structure by studying the skeleton and muscle characteristics of the manta ray pectoral fin (He et al., 2020; He et al., 2022), and divided the pectoral fin structure into a pectoral fin skeleton and a permeable flexible skin from a bionics perspective. In the research design, in order to better control the movement of the bionic pectoral fin, He et al. designed as many pectoral fin skeletons as possible, and used multiple pairs of skeletons to control the pectoral fins in the final result (such as Figure 8 ) ; In order to make the pectoral fin movement have higher precision, less friction, no wear and no need for lubrication, He adopts a cross spring shaft (such as Fig. 9 ), the axis can be used to achieve the bending and twisting movement of the pectoral fin at the same time, and at the same time it can better adapt to the impact of external forces and loads.

[0053] Cai et al. from Northwestern Polytechnical University optimized the pectoral fins (Cai et al., 2019a; Cai et al., 2019b; Chen Lingkun et al., 2020) and used a servo motor to design the manta ray configuration. The sketch of the middle pectoral fin is shown in the figure. Fig.10 As shown, the middle pectoral fin is a three-joint wing, which is composed of a synchronous belt and a slider rocker mechanism. It is driven by a motor at the root of the pectoral fin, and the front and rear pectoral fins are directly driven by the motor, realizing the spatial shape and flexible characteristics of the bionic manta ray pectoral fin and completing the driving of the manta ray.

[0054] like Figure 2As shown in the cross-sectional view of the aircraft design, the inclined surface of the aircraft and the incoming flow parallel to the x-axis produce a force F perpendicular to the inclined surface. This vertical component can be further decomposed into the lift force F along the x-axis direction. L and the drag F opposing the speed V of the vehicle D At the beginning of entering the water, the lifting force mainly acts on the front end of the vehicle, generating an upward lifting moment. This moment will cause the attitude and trajectory of the vehicle to deflect, eventually causing the vehicle to tilt upward and break through the water surface.

[0055] The waverider aircraft that can repeatedly enter and exit the water provided by the present invention is a multifunctional cross-media aircraft, which is designed to perform complex reconnaissance and combat missions and has the ability to operate in water and in the air. This aircraft is equipped with an advanced hybrid power system (a quiet and long-endurance magnetohydrodynamic engine 5 is used underwater, and a green hydroxylamine nitrate-based engine 1 is used to provide a large acceleration in an instant during the final breakthrough), ensuring efficient performance in a changeable combat environment. When performing reconnaissance missions, the aircraft can quickly enter the target area and dive to a predetermined depth quickly. The bionic design of its upper surface similar to that of a manta ray can effectively cover the aircraft. The flexible hydrofoil 4 can be used to adjust the depth and direction of the dive, and after the mission is completed, the hydrofoil is used to surface and exchange data with the command center. When performing combat missions, the aircraft glides at high speed into the defense circle of the target formation, and adjusts the angle and speed during this process to meet the requirements for entering the water. After entering the water at a high speed (around 600m / s), due to the effect of asymmetric hydrodynamics, the trajectory of the vehicle shifts after entering the water surface, and the speed vertical to the water surface changes from a negative value to a positive value, achieving an inclined exit from the water. When it is completely out of the water, due to the effect of gravity, the speed vertical to the water surface continues to decrease to a negative value, and the vehicle falls and lands in the water. This movement is repeated many times, and when the final speed is not enough to support it out of the water, the underwater engine starts working and it dives underwater. The vehicle secretly approaches important targets, and before it starts anti-submarine operations, it uses its high maneuverability to quickly exit the water at the best position to launch a precision strike. The entire design fully considers the concealment, flexibility and multi-task execution capabilities of the vehicle, making it a key weapon that can effectively complete tasks in complex battlefield environments. Figure 3 As shown in the figure, it is a schematic diagram of the aircraft's cross-medium penetration scheme; Figure 4 As shown, the trajectory of the vehicle during the water skipping process is obtained based on the simulation results combined with the dynamic equation of the vehicle.

[0056] The waverider vehicle of the present invention that can repeatedly enter and exit water can perform reconnaissance operations and offensive operations, as follows:

[0057] 1. Reconnaissance warfare methods:

[0058] Multiple such vehicles were launched and quickly deployed outside the defense circle to continuously monitor the position and progress of subsequent formations.

[0059] 1. Launch the spacecraft, which reaches the target area with rocket propulsion and enters and exits the atmosphere. During this stage, it performs semi-ballistic aerodynamic deceleration. When it reaches the specified altitude, the speed will drop to slightly higher than the water entry speed (2-3Ma). At this stage, the target is difficult to detect.

[0060] 2. When arriving near the target, start gliding in the air to decelerate, so that the speed can be reduced to below 700m / s, meet the entry angle and speed requirements, and ensure that the structure is not damaged.

[0061] 3. The navigation body changes the angle and trajectory of the aircraft through the rudder surface of the foldable tail 2 to ensure that the entry angle is about 15°. The aircraft enters the water and begins to enter and exit the water multiple times with the help of the waverider shape. It decelerates at this stage to reduce the probability of target detection.

[0062] 4. After the speed of the navigation body is reduced to a level that is insufficient to support the re-emergence of the water, the submerged mode is started, and the flexible hydrofoil 4 is opened through the mechanical linkage device. The flexible hydrofoil 4 is used to adjust the depth and change the direction of the submersible underwater, and the long-endurance magnetic fluid underwater propulsion system 5 carried by the submersible satisfies its long-term endurance, including reconnaissance, communication, relay and other tasks.

[0063] 5. Due to the bionic design, it can lurk in the target sea area. When a target ship passes by, it can approach and launch an attack, thus achieving the combat purpose of integrated reconnaissance and strike.

[0064] (II) Offensive combat methods:

[0065] According to the target large surface ship targets obtained by satellites, drones and other reconnaissance means, the specific implementation method is as follows:

[0066] 1. Launch the spacecraft, which reaches the target area with rocket propulsion and enters and exits the atmosphere. During this stage, it performs semi-ballistic aerodynamic deceleration. When it reaches the specified altitude, the speed will drop to slightly higher than the water entry speed (2-3Ma). At this stage, the target is difficult to detect.

[0067] 2. Arrive outside the target's air defense circle and start gliding in the air to decelerate, so that the speed can drop below 700m / s, meet the water entry angle and speed requirements, and ensure that the structure is not damaged.

[0068] 3. Control the trajectory and angle of entry of the aircraft by controlling the rudder surface of the foldable tail 2, and ensure that the angle of entry is about 15 degrees. When the distance from the target is 20 km, the aircraft enters the water and tilts out of the water with the help of the waverider shape. After exiting the water, the angle of entry is adjusted with the help of the rudder surface to ensure that the angle of entry is appropriate each time. Multiple entry and exit are achieved. (The rudder surface of the foldable tail 2 is responsible for generating the necessary lift and control torque to achieve precise flight control. During the process of entering and exiting the water, the adjustment of the rudder surface ensures that the aircraft can maintain balance in different fluid dynamic environments, ensuring the continuity and safety of operation.)

[0069] 4. When approaching the target by 5 km, dive into the water, open the flexible hydrofoil 4, and realize underwater navigation.

[0070] 5. When approaching the target underwater defense circle, the flexible hydrofoil 4 is folded, the thrust of the magnetohydrodynamic propulsion system is used to make the vehicle out of the water, and the hydroxylamine nitrate engine is used for the final air acceleration to hit the target waterline, and the multiple superposition effects of explosion and cavitation generation are used to maximize the combat effectiveness.

[0071] Example:

[0072] Figures 5(a), (b) and (c) are cloud diagrams of the free surface changes when the vehicle enters the water at a speed of 600m / s and at angles of 10°, 15° and 20° respectively. It can be observed that when the angle of entry is 20°, the vehicle enters the water surface at a steeper angle. Due to the relatively large angle, the cavitation generated by the vehicle forms a larger bubble area at the tail of the vehicle. In this case, the impact force of the water flow is strong, and the cavitation morphology appears to be relatively stable and lasts for a long time. The trajectory of the vehicle is strongly affected by the water flow, rapidly decelerating and sinking downward. The water flow is violently disturbed, resulting in a large range of water surface fluctuations and the formation of vortices. When the angle of entry is 15°, the contact area between the vehicle and the water surface is larger, and the reaction force of the water causes the vehicle to produce a smoother trajectory. The cavitation formation area becomes larger, and the closing speed of the cavitation under the vehicle is relatively slow. The motion trajectory of the vehicle is relatively stable, the sinking speed is slowed down, and the trajectory tends to be smoother. The disturbance on the water surface is relatively reduced, but the complex changes in the water flow and the generation of local vortices can still be observed. When the entry angle is 10°, after the navigation body contacts the water surface at a very small angle, due to the small angle and large contact area, the support force of the water body on the navigation body is greater than its gravity and sinking force, causing the navigation body to jump or glide on the water surface, resulting in a ricochet phenomenon. In this case, cavitation is hardly formed, and the water surface is only slightly disturbed. The navigation body will bounce on the water surface many times until its speed and angle are reduced to a certain extent before it finally enters the water or stops drifting.

[0073] Through the above analysis, it is concluded that, under the condition of keeping the same speed of the navigation body, as the angle of entry of the navigation body decreases, the area in contact with the water surface increases, the upward force exerted on the navigation body by the water surface increases, and the depth of entry into the water decreases. At the same time, the area of ​​disturbance on the water surface increases but the depth decreases, the splashing degree of the liquid surface is reduced, and when the angle decreases to a certain extent, a ricochet phenomenon occurs, and the navigation body bounces on the water surface multiple times.

[0074] At the same water entry angle, as the water entry speed increases, the depth of the vehicle entering the water increases slightly, the disturbance of the water surface increases, and the splash effect is more obvious. At the same time, as the speed of the object entering the water increases, the impact load generated when the vehicle hits the water surface increases, the head of the vehicle is subjected to a greater force, and the deformation of the head increases. Since both liquid surface splashing and head bending deformation may affect the trajectory of the vehicle and cause the trajectory of the vehicle to deviate, choosing the right speed is crucial to maintaining the stability of the trajectory of the vehicle.

[0075] Next, the structure of the vehicle is analyzed. As shown in Figure 6 (a), (b), (c), and (d), during the water impact, the head of the vehicle is subjected to large dynamic loads and pressures, and its deformation may affect the stability and durability of the overall structure. It is not difficult to see that under the reaction force of water on the vehicle, the head will deform inward when impacted. In order to ensure the integrity of the internal structure of the vehicle and prevent damage to internal components caused by deformation of the outer shell, it is necessary to limit the maximum deformation value to a specific compliance range when necessary. This is of great significance to engineering design and helps maintain the stability of the vehicle structure and the safety of internal components.

[0076] Figures 7(a), (b), (c), and (d) show the changes in the vertical velocity and horizontal acceleration of the waverider vehicle at different water entry angles (20°, 15°, and 10°). Figure 7(a) reveals the change trend of its velocity over time after the vehicle enters the water. For the 20° water entry case, the speed of the vehicle drops rapidly at the moment of contact with the water surface, indicating that it is subject to strong water resistance, which causes its speed to decrease sharply and tend to zero. Similarly, at the water entry angles of 15° and 10°, the speed decrease trend is still obvious, but as the water entry angle decreases, the speed curve gradually becomes gentle, indicating that the water resistance of the vehicle is relatively small, and the speed decrease rate after entering the water slows down. Especially at the water entry angle of 10°, the vehicle exhibits motion characteristics different from other angles. The speed curve shows that in the early stage of contact with the water surface, the speed not only does not decrease significantly, but increases slightly, which indicates that the vehicle does not completely enter the water at a low angle, but a water drift occurs. As time goes by, the speed gradually decreases, reflecting that the vehicle's gliding on the water surface gradually slows down and eventually the energy is exhausted.

[0077] Figure 7(b) shows the change in the horizontal impact force on the vehicle when it enters the water. The peak acceleration when entering the water at 20° is higher, reaching about 16*10 3 g, indicating that the navigation body is subjected to a stronger impact force from the water at this angle. However, as the entry angle decreases further, the acceleration curves at 15° and 10° are relatively gentle, and the peak values ​​are also lower, indicating that the entry process is smoother and the navigation body is subjected to less force. Therefore, from the comparison of acceleration and speed changes, the entry angle has a significant impact on the motion characteristics of the navigation body. A larger entry angle leads to a more violent impact and greater resistance, while a smaller entry angle is prone to water drifting, making it difficult for the navigation body to enter the water smoothly.

[0078] By analyzing the velocity and acceleration curves of the waverider vehicle at different water entry angles, the following conclusions can be drawn: At a smaller water entry angle (such as 10°, 15°), the vehicle of this shape will experience obvious ballistic deflection during the water entry process. After contacting the water surface, the vehicle will not penetrate into the water, but will gradually turn to a movement parallel to the water surface due to asymmetric external forces. The vehicle cannot remain in the water, but quickly leaves the water surface to achieve the water exit process. During the entire process, due to the smaller water entry angle, the load borne by the vehicle is significantly less than when it enters the water vertically, which helps to protect the structural integrity of the vehicle and avoid structural damage caused by excessive impact force.

[0079] Through the analysis of the process of waverider vehicle entering water, it can be concluded that there will be significant ballistic deflection during the entry process, especially when the entry angle is small, the trajectory of the vehicle will gradually turn to a direction parallel to the water surface. As the vehicle glides in the water, it gradually overcomes gravity and pushes the vehicle to the surface of the water, and finally exits the water. In this process, due to the small entry angle, the water resistance and peak acceleration of the vehicle are significantly lower than when it enters the water vertically, thereby effectively reducing the impact on the vehicle structure and ensuring its structural integrity. This motion characteristic allows the vehicle to remain stable in complex environments and is suitable for performing multiple entry and exit tasks.

[0080] In order to achieve repeated entry and exit operations of the navigation body, two measures can be adopted: First, optimize the entry angle. By automatically adjusting the entry angle control system, dynamically adjust the entry angle according to the state of the navigation body and water flow conditions, so that it always enters the water at a smaller angle (such as 15°), ensuring that the navigation body quickly turns to glide parallel to the water surface after entering the water, and finally exits the water. The second is to strengthen the surface material and structural design of the navigation body, select high-strength, lightweight materials, and use drag-reducing coatings, so that the navigation body can better resist the impact and friction of the water body during entry, glide and exit, thereby achieving smooth multiple entry and exit operations. These measures can not only improve the durability of the navigation body, but also effectively control its motion trajectory to meet the mission requirements of multiple entry and exit.

[0081] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wave-riding vehicle capable of repeatedly entering and exiting water, characterized in that: It comprises a main body structure with a waverider shape, a hydroxylamine nitrate propulsion system (1), a foldable tail wing (2), a warhead (3), a flexible hydrofoil (4) and a magnetic fluid underwater propulsion system (5); Wherein, the warhead (3) is arranged at the head of the aircraft body structure; Two foldable tail wings (2) are symmetrically arranged on the upper surface of the tail of the main body structure, and their angles can be adjusted as needed in different flight stages; The hydroxylamine nitrate propulsion system (1) is arranged at the tail of the body structure; The magnetic fluid underwater propulsion system (5) is arranged at the belly position of the main body structure; Two flexible hydrofoils (4) are symmetrically arranged on both sides of the tail of the main body structure and are installed on the main body structure through a connecting rod structure. When the aircraft is flying in the air, the two flexible hydrofoils (4) are retracted to the lower surface of the tail of the main body structure and can be turned up and unfolded when needed under the drive of the connecting rod mechanism. The turning and unfolding angles can be adjusted according to needs.

2. A wave-riding vehicle capable of repeatedly entering and exiting water as claimed in claim 1, characterized in that: The flexible hydrofoil (4) adopts a bionic manta ray pectoral fin structure.

3. A wave-riding vehicle capable of repeatedly entering and exiting water as claimed in claim 1, characterized in that: The lower surface of the head of the main body structure is a titanium alloy reinforcement area (6).

4. A wave-riding vehicle capable of repeatedly entering and exiting water as claimed in claim 1, characterized in that: The upper surface of the vehicle's main structure adopts the manta ray's bionic design.

5. A method of operation for a waverider vehicle capable of repeatedly entering and exiting water as claimed in claim 1, characterized in that: include: 1) launching a plurality of the above-mentioned spacecraft, which arrive above the target area with rocket propulsion, and perform atmospheric entry and exit operations, during which they perform semi-ballistic aerodynamic deceleration; When reaching the specified height, the speed will drop to a level greater than the water entry speed; 2) When the vehicle reaches the target, it starts to glide in the air to reduce the speed to below 700m / s, meeting the water entry angle and speed requirements; 3) The navigation body changes the angle and trajectory of the aircraft through the control surface of the foldable tail wing (2) so that the angle of entry into the water is guaranteed to be 15°; the aircraft enters the water and begins to enter and exit the water multiple times with the help of the waverider shape, and decelerates during this stage; 4) After the speed of the navigation body decreases to a level that is insufficient to support the vehicle to leave the water again, the navigation mode is started, and the flexible hydrofoil (4) is opened through a mechanical connecting rod device; the flexible hydrofoil (4) is used to adjust the depth and change the direction of the vehicle underwater; and the magnetic fluid underwater propulsion system (5) provided with underwater navigation power; 5) The vehicle lurks in the target sea area. When a target ship passes by, it approaches the target and launches an attack, thus achieving the combat goal of integrated reconnaissance and strike.

6. The combat method according to claim 5, characterized in that: The spacecraft speed will be reduced to 2Ma-3Ma.

7. A method of operating a waverider vehicle capable of repeatedly entering and exiting water as claimed in claim 1, characterized in that: include: 1) Launch the spacecraft, which reaches the target area with the help of rocket propulsion and performs atmospheric entry and exit operations, during which semi-ballistic aerodynamic deceleration is performed; When reaching the specified altitude, the speed will drop to 2Ma-3Ma; 2) Arrive outside the target's air defense circle and start gliding in the air to slow down, so that the speed can drop below 700m / s to meet the water entry angle and speed requirements; 3) The trajectory and water entry angle of the aircraft are controlled by controlling the rudder surface of the foldable tail wing (2) to ensure that the water entry angle is 15 degrees; when the aircraft is 20 km away from the target, it enters the water and exits the water with the help of the waverider shape. After exiting the water, the water entry angle is adjusted with the help of the rudder surface to ensure that the angle of each entry is an appropriate angle, so as to achieve multiple entry and exit; 4) When the vehicle is 5 km away from the target, it dives into the water and opens the flexible hydrofoil (4) to achieve underwater navigation; 5) When approaching the target underwater defense circle, the flexible hydrofoil (4) is folded, the thrust of the magnetohydrodynamic propulsion system is used to make the vehicle out of the water, and the hydroxylamine nitrate engine is used for the final air acceleration to hit the target waterline, and the multiple superposition effects of explosion and cavitation generation are used to maximize the combat effectiveness.

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