Highly cushioned lateral-vertical coupling anti-shock isolation platform

Abstract

The application discloses a high-cushion horizontal-vertical coupling anti-impact isolation platform, which comprises a device mounting platform, an air spring cushion system, an auxiliary support system and a mounting base. The device mounting platform comprises a freely customizable upper mounting base surface and a lower mounting base surface for connecting the auxiliary support system and the vertical air bag unit; the air bag cushion system comprises a vertical cushion air bag group and a horizontal cushion air bag group; the auxiliary support system comprises a support ridge and a square base column; and the mounting base comprises a lower mounting base surface for connecting the ground and an upper mounting base surface for connecting the auxiliary support system. The high-cushion horizontal-vertical coupling anti-impact isolation platform can efficiently isolate impacts and vibrations from different directions and significantly enhance the anti-impact capacity of the device structure. The internal air bag system can quickly respond to and absorb exciting forces, reduces damage to the device or structure, provides excellent damping effect and guarantees the stability and safety of the device system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of impact-resistant, cushioning vibration isolation structures, and in particular to a high-cushioning horizontal-vertical coupling impact-resistant vibration isolation platform. BACKGROUND

[0002] With the rapid development of science and technology, more and more electronic devices and instruments are applied to related fields. Due to their high precision, easy operation, and intelligent judgment, they have become an indispensable part of ships. Research shows that the most serious impact on ships during an explosion is the failure of electronic control systems, radar systems, communication and navigation equipment, engines, and other shipborne equipment caused by transient loads. Damage to these devices can not only result in the loss of key system functions, but can also trigger a chain reaction, causing more serious damage.

[0003] During the impact test, a variety of precision test instruments need to be installed inside the platform, including various sensors, computers, and other precision equipment. Most of these devices are ordinary devices without impact resistance. To ensure that various sensors and test equipment work normally during underwater explosions and save data, these devices must be protected from impact. The cushioning platform is a cushioning device composed of impact isolation elements and a support frame. The measuring equipment is installed on this device. During the underwater explosion process, the impact response of the platform serves as the impact input of the cushioning platform. Through the cushioning and isolation effect of the cushioning platform, the system frequency can be reduced, and the impact on the measuring equipment can be reduced. The primary principle in designing the cushioning platform is to ensure its strength and stiffness, and to provide a safe impact environment for test instruments under the action of explosion impact.

[0004] Therefore, it is of great significance to design a buffer platform that can effectively provide impact protection to ensure the reliability and survivability of these shipborne equipment in extreme conditions. This buffer platform needs to be able to cope with high-intensity multidirectional coupled transient impact, which is a great challenge in the current design of shipborne equipment impact protection platform. The existing shipborne equipment impact protection platform usually adopts a whole or local fixation, combined with a vertical connection support of a buffer unit. Although it can effectively cope with single-direction regular small-intensity regular impact, such as equipment operation vibration, wave impact transmitted to the equipment from the ship body during ship navigation, and small-intensity transient impact, it is insufficient in protection capability when facing the explosion impact of the ship under attack and the motion impact generated by high-intensity maneuvering of the ship, which has the characteristics of large amplitude, narrow pulse width, non-fixed direction and non-single. Therefore, it is an urgent need to develop a new highly adaptive buffer platform technology to improve the reliability and durability of shipborne equipment under extreme conditions. This new buffer platform should have the following key characteristics: 1. It can effectively absorb and disperse high-intensity transient impact energy from all directions, and has effective isolation capability for multidirectional coupled impact; 2. It has rapid response capability and can make buffer action in a very short time to adapt to the dynamic changes of impact load; 3. It is compact and lightweight to reduce the impact on the overall performance of the ship; 4. It is easy to maintain and upgrade, and can be adapted to the latest threat situation and technological progress.

[0005] This new buffer platform has multidirectional coupled transient impact protection capability and can adapt to complex and variable impact environment, which can significantly improve the survivability of shipborne equipment. In order to meet the requirements of high-intensity transient impact resistance, the selection of buffer unit is very important. The commonly used buffer units for existing impact protection platforms include spring buffer units and hydraulic buffer units. Although the spring buffer unit has good vibration isolation effect and can withstand certain radial displacement, it has poor impact resistance effect when dealing with sudden load due to its high natural frequency, and will vibrate for a long time after being subjected to sudden load; the hydraulic buffer unit may be damaged when subjected to axial load because its structure cannot bear radial displacement. Air bag vibration isolator uses compressed gas as working medium, has the advantages of high flexibility, low natural frequency, high controllability and large standard load. They not only can withstand radial displacement, but also can effectively respond to sudden load, so they show significant advantages when dealing with high-intensity transient impact of shipborne equipment in extreme impact environment.

[0006] Considering the above factors, in order to meet the impact resistance requirements of shipborne equipment in complex impact environment, it is of practical demand to design a transverse-vertical coupled impact protection buffer platform using air bag vibration isolator as buffer unit. SUMMARY

[0007] The present application aims to provide a high-cushioning lateral-vertical coupling anti-impact isolation platform.

[0008] A high-cushioning lateral-vertical coupling anti-impact isolation platform, comprising a device mounting platform, an air bag cushioning system, an auxiliary support system and a mounting base; the auxiliary support system comprises square base columns and support ridges; the air bag cushioning system comprises a longitudinal cushioning air bag group and a lateral cushioning air bag group; the lower mounting base surface of the device mounting platform is connected with the longitudinal cushioning air bag group and the support ridges; the upper mounting base surface of the mounting base is connected with the square base columns and the support ridges; the longitudinal cushioning air bag group is connected with the square base columns; the support ridges between the two mounting base surfaces are connected through the lateral cushioning air bag group.

[0009] Further, the air bag inherent frequency, the device mounting platform output acceleration and the maximum force that the platform can input satisfy:

[0010] Air bag output inherent frequency:

[0011] Device mounting platform output acceleration: G out = 2πf nR ΔV≤80g

[0012] Maximum force that the platform can input:

[0013] Wherein, n is the number of vertical / lateral mounting air bags, k is the stiffness of a single mounting air bag, m1 is the mass of the isolation platform, m2 is the mass of a single mounting air bag, is an arbitrary waveform acceleration input.

[0014] Further, the lower mounting base surface of the device mounting platform contains 4 mounting positions on each side, a total of 12 mounting positions, wherein the mounting positions at the four corners are used to connect the longitudinal cushioning air bag group, and the two mounting positions in the middle of each side are used to mount the support ridges connecting the lateral cushioning air bag group.

[0015] Further, the upper mounting base surface of the mounting base is provided with square bases at each corner for connecting the longitudinal cushioning air bag group, and mounting positions are arranged in the middle of each side for mounting the support ridges connecting the lateral cushioning air bag group.

[0016] Further, the longitudinal cushioning air bag group has a total of 4 air bag units, which are respectively mounted at the corners of the buffer, one at each corner, and are connected with the lower mounting base of the device mounting platform and the square base columns on the mounting base; the lateral cushioning air bag group has a total of 8 air bag units, which are mounted at the sides of the buffer, two at each side, and are connected with the lower mounting base surface of the device mounting platform and the upper mounting base surface of the mounting base through the support ridges.

[0017] Further, the air bag buffer unit is composed of n air bags in series.

[0018] Further, the support ridge is composed of two high-strength steel vertical weldings, and mounting holes are left on the support ridge, and two rib plates are arranged on each side to strengthen the support ridge.

[0019] The present application has the following advantages:

[0020] A transverse-vertical coupling impact resistance method is provided, and it is found in the experimental verification stage that, compared with the traditional impact resistance technology, this method only needs to use fewer impact resistance units to achieve the same or even better buffering effect. This method enables the equipment to adapt to various impact environments and conditions, and provides a new direction and possibility for the development of impact resistance technology.

[0021] A transverse-vertical coupling symmetric buffer structure is designed in detail for extreme impact environment of a ship. By skillfully combining the transverse and vertical buffering mechanisms, higher efficient energy absorption and dispersion can be achieved when facing non-unidirectional coupled impact, and buffering and impact resistance protection for multi-directional transient impact of shipborne equipment is provided, which can effectively cope with the complex loading conditions of the equipment carried by the buffering and impact resistance structure in the actual working environment of the shipborne equipment.

[0022] Air bag buffering technology is adopted. The air bag has the characteristics of small size, no creep, high carrying capacity, etc., and compared with the traditional spring buffer unit, the air bag buffer has obvious advantages in absorbing impact energy, and has good buffering effect for high-intensity transient impact in the impact environment of shipborne equipment. Considering the advantage of small size of the air bag buffer, a air bag buffer unit composed of three air bag buffers in series is designed. This design not only improves the safety of the equipment in extreme conditions, but also reduces the maintenance cost when accidental damage occurs. By series design, each air bag buffer can absorb impact energy in stages, which can reduce the load borne by a single buffer, thereby improving the stability and reliability of the whole system.

[0023] The present application has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole structure diagram of the high-buffering transverse-vertical coupling impact resistance and vibration isolation platform of the present application;

[0025] Figure 2 It is a whole structure diagram of the high-buffering transverse-vertical coupling impact resistance and vibration isolation platform of the present application;

[0026] Figure 3Figure 1 is a schematic diagram of a mounting base and associated part auxiliary support system of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0027] Figure 4 Figure 2 is a schematic diagram of a device mounting platform and associated part auxiliary support system of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0028] Figure 5 Figure 3 is a structural schematic diagram of a support ridge of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0029] Figure 6 Figure 4 is a structural schematic diagram of a square base column of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0030] Figure 7 Figure 5 is an acceleration output of different measuring points of a cushion platform table of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0031] Figure 8 Figure 6 is a calculation result of X-direction response of a characteristic point of a table of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0032] Figure 9 Figure 7 is a calculation result of Y-direction response of a characteristic point of a table of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0033] Figure 10 Figure 8 is a calculation result of Z-direction response of a characteristic point of a table of a high-cushion horizontal-vertical coupling anti-impact vibration isolation platform of the present application;

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 1 - device mounting platform, 2 - air spring cushion system, 3 - square base column, 4 - support ridge, 5 - mounting base DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with the drawings.

[0037] In order to fully express the purpose, technical solution and advantages of the embodiments of the present application, the present application will be described in detail below in conjunction with the drawings of the embodiments. Obviously, the following described embodiments are only a part of the embodiments of the present application, but not all complete embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] When a ship is attacked by underwater explosion or the like, the base of the installed device suffers from transient impact load. When the impact duration τ is greater than the natural period T of the vibration isolation system, the impact load is not completely absorbed by the vibration isolation system, and the base of the installed device will be damaged.n When the shock wave is very small, the effect of the shape of the wave on the response of the equipment can be neglected, and the decisive factor is the area contained in the wave shape. In the wave shape expressed in acceleration, the same area means the same velocity at the end of the shock. This process of the sudden change of velocity, which neglects the shape of the shock wave and is expressed by the velocity at the end of the shock, is called velocity step. Its value ΔV is called step velocity, and is mathematically called initial velocity. For an arbitrary wave shape of acceleration input

[0039]

[0040] At present, many standards in China take this as the design value of the shock. At this time, the effect of damping on the explosion shock can be neglected. The maximum displacement of the equipment:

[0041]

[0042] The maximum acceleration of the equipment:

[0043]

[0044] The maximum force acting on the equipment:

[0045]

[0046] In the formula: K z - shock stiffness of the isolation system.

[0047] As can be seen from equation (4), under the condition that the step velocity and the mass of the equipment are constant, in order to reduce the force acting on the equipment, an isolator with the smallest shock stiffness should be selected.

[0048] For example Figure 1 is a typical shock acceleration input curve, and its peak value is 3000g. According to equation (1), the step velocity ΔV of this wave shape is 5m / s.

[0049] Therefore, the natural frequency f n of the isolator can be estimated as:

[0050]

[0051] In equation (5), G out is the maximum output acceleration. In the American MIL-S-901D standard, it is required that the acceleration output response of the platform should be less than 80g when the bottom of the buffer platform is subjected to a shock of 3000g acceleration. Therefore, the design requirement of this buffer platform according to the American MIL-S-901D standard is 80g.

[0052] The buffer element on the existing floating impact platform is basically an air spring. The vibration isolator is preferably a FT75-20 DI CR type three-capsule air spring vibration isolator, and the main performance parameters thereof are as follows: the spring is selected to have a height of 260 cm, a pressure of 6 bar, a force of 4 kN, a volume of 3.2 I, an inherent frequency of 2.1 Hz, and a single weight of 1.8 kg, and the air spring stiffness parameters are shown in Table 1

[0053] Table 1 Air spring stiffness parameters

[0054]

[0055] The entire set of equipment is in accordance with the medium-sized floating impact platform test standard of 1000 kg.

[0056] From the above conditions, the number of air springs is calculated.

[0057] Output inherent frequency

[0058]

[0059] Output acceleration

[0060] G out = 2πf nR ΔV≤80g

[0061] Thus, 0 < n ≤ 15 is obtained, and considering the lightweight of the ship structure and the space utilization rate, at least one vibration isolator is installed on each side, so four FT75-20 DI CR type three-capsule air spring vibration isolators are selected in the vertical position and the lateral position. Thus, the actual vertical inherent frequency of the vibration isolation system can be calculated:

[0062]

[0063] Actual vertical acceleration of the instrument acting on the buffer platform

[0064] G out垂 = 2πf nR ΔV = 39.9g ≤ 80g (8)

[0065] Actual lateral inherent frequency

[0066]

[0067] Actual lateral acceleration of the instrument acting on the buffer platform:

[0068] G out横 = 2πf nR ΔV = 39.9g ≤ 80g (10)

[0069] Through the above calculation analysis and checking, it is known that the design of the buffer device meets the technical requirements.

[0070] In practical applications, the type of air spring is usually also optimized according to design requirements. For example: the known external load impact acceleration is 3000g, the step speed of 5m / s can be calculated by formula (1). According to the relevant standards, according to the actual use requirements, the output impact speed of the vibration isolation platform should be reduced to 39.9g, so the actual lateral / vertical natural frequency is calculated to be 12.7Hz by formula (10). Based on the known fact that the buffer vibration isolation platform selects four air spring isolators in the vertical and lateral positions respectively, according to the actual demand, the spring stiffness k and weight m are calculated by formula (6), and the optimal value is selected by comprehensively considering the lightweight and space utilization of the buffer platform structure. In this example, k = 1.6*106N / m, m = 1.8kg.

[0071] As shown in Figure 7 Take the vertical acceleration input as an example, perform numerical simulation analysis to examine whether the buffer performance of the buffer platform can meet the design requirements. Through the transient response finite element analysis module, the vertical acceleration input is applied to the lower surface of the support seat, and the peak value reaches 3000g. The acceleration output of different measuring points on the platform table is investigated.

[0072] Figures 8 to 10 For the acceleration X direction input, the acceleration response curves of the three directions of the six feature points on the table. As can be seen from the results, the X direction acceleration response of the feature points on the table is significantly higher than that of the other two directions, so the X direction acceleration output curve is analyzed: the acceleration peak of the table is about 30g. At the beginning of the impact, the acceleration response of the table reaches the first peak at 200ms, and then in the subsequent buffer period, the acceleration amplitude rises again at about 360ms, and another maximum value appears at 500ms. This is because at the end of the first buffer period, the buffer platform reaches the compression limit, and the vibration of the foundation will give the test equipment a reaction force, which will act on the buffer platform again, thereby being transmitted to the test equipment. At this time, the amplitude is already smaller than the amplitude of the first vibration period. In the subsequent vibration period, there will also be several extreme values, but they are already significantly smaller than the previous two vibration amplitudes. The buffer platform gradually oscillates and then tends to be stable. The X direction acceleration output of the platform table is not greater than 30g, which is less than the 80g specified in the American MIL-S-901D standard, thereby verifying the rationality of the design of the buffer platform.

[0073] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A highly cushioned lateral- vertical coupling impact isolation platform, characterized by: The device mounting platform (1), the air bag buffer system, the auxiliary support system and the mounting base (5); the auxiliary support system includes square base column (3) and support ridge (4); the air bag buffer system includes longitudinal buffer air bag group and transverse buffer air bag group; the lower mounting base surface of the device mounting platform is connected with longitudinal buffer air bag group and support ridge (4); the upper mounting base surface of the mounting base (5) is connected with square base column (3) and support ridge (4); the longitudinal buffer air bag group is connected with square base column (3); the support ridge (4) between the upper mounting base surface and the lower mounting base surface is connected through the transverse buffer air bag group, the lower mounting base surface of the device mounting platform (1) contains 4 mounting positions on each side, containing 12 mounting positions in total, wherein the mounting positions at the four corners are used for connecting longitudinal buffer air bag group, the two mounting positions in the middle of each side are used for mounting support ridge (4) connected with transverse buffer air bag group, the upper mounting base surface of the mounting base (5) is provided with square base column (3) at each corner for connecting longitudinal buffer air bag group; the middle of each side is provided with mounting position for mounting support ridge (4) connected with transverse buffer air bag group, the longitudinal buffer air bag group has 4 air bag units in total, which are mounted at the four corners of the vibration isolation platform, one at each corner, and are connected with the lower mounting base surface of the device mounting platform (1) and square base column (3) on the upper mounting base surface of the mounting base (5); the transverse buffer air bag group has 8 air bag units in total, which are mounted on the four sides of the vibration isolation platform, two on each side, and are connected with the lower mounting base surface of the device mounting platform (1) and the upper mounting base surface of the mounting base (5) through support ridge (4).

2. A highly cushioned lateral-vertical coupling anti-impact vibration isolation platform according to claim 1, characterized in that: The air bag inherent frequency, the device mounting table output acceleration, and the maximum force that the platform can input satisfy: Airbag output natural frequency: ; Device mounting table output acceleration: ; Maximum force the platform can input: ; where n is the number of vertical / lateral installed air springs, k is the stiffness of a single installed air spring, ml is the mass of the isolation platform, m2 is the mass of a single installed air spring, is the step velocity, mathematically referred to as the initial velocity, is the impact duration, the first second, is the acceleration value at a certain time, is the gravitational acceleration.

3. A highly cushioned lateral-vertical coupling anti-impact vibration isolation platform according to claim 1, wherein: The air bag unit is composed of n air bags in series.

4. A highly cushioned lateral-vertical coupling shock absorbing isolation platform according to claim 1, wherein: The support ridge (4) is composed of two high-strength steel vertical weldings, which have mounting holes on them, and each side has two rib plates for reinforcement.

Images