Vibration isolation system for automobile road simulation and experiment and vibration isolation design method

Abstract

The invention discloses a vibration isolation system for automobile road simulation and experiment and a vibration isolation design method.The vibration isolation system comprises a vibration isolation foundation, a vibration isolation device and a vibration state detection device.The vibration isolation foundation comprises an inner foundation and an outer foundation, the inner foundation is hung downwards and supported in the outer foundation through the vibration isolation device, and the top of the outer foundation is higher than the top of the inner foundation; wherein the vibration state detection device comprises a data acquisition module and a data analysis module connected with the data acquisition module, and the data acquisition module is connected to the outer foundation, the inner foundation and the vibration isolation device. According to the invention, negative effects caused by resonance caused by the test system and the foundation can be effectively reduced, and the dynamic response of the foundation is reduced so as to meet the working requirements of a mechanical system on the table board during normal operation. And meanwhile, the dynamic response of the outer foundation can be remarkably reduced, and the vibration influence on the surrounding environment cannot be generated. The vibration response of the internal and external foundations is obtained in real time, an early warning mechanism is set, and normal work of the vibration isolation system can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering vibration control, and in particular relates to a vibration isolation system and a vibration isolation design method for automobile road simulation and experiment. Background Art

[0002] The automobile road simulation and test platform is mainly used for vibration simulation tests or simulated strengthening tests under indoor conditions. It reproduces the driving conditions of the vehicle under different working and road conditions under indoor conditions to achieve the same effect as the actual working conditions. It is used to assess the load-bearing capacity, vibration reduction performance and vehicle status of the whole vehicle or vehicle parts when an accident occurs, and then evaluate the comfort and smoothness of the vehicle and analyze the causes of the accident. Since the weight of the vehicle is smaller than that of the building structure, it is generally a full-scale test. The foundations of the commonly used automobile road simulation and test platforms are mostly large-volume reinforced concrete foundations. Since the large-volume reinforced concrete foundation is directly connected to the foundation, the foundation vibration is directly transmitted to the surrounding structure through the foundation during the vibration test, which not only affects the safety of the surrounding structure, but more importantly, it has a negative impact on the normal use of the equipment and the comfort of personnel. The vibration isolation foundation can not only effectively reduce the vibration of the foundation itself and play a positive role in the normal operation of the equipment, but also attenuate the vibration of the surrounding environment and reduce the impact of the vibration table operation on the surrounding buildings. Therefore, vibration control of the vehicle road simulation and test platform is of great significance to ensure the normal operation of the experimental platform. Summary of the invention

[0003] The object of the present invention is to provide a vibration isolation system and a vibration isolation design method for automobile road simulation and experiment, with low basic dynamic response.

[0004] In order to achieve the above-mentioned purpose, the vibration isolation system for automobile road simulation and experiment of the present invention includes a vibration isolation foundation and a vibration isolation device, which also includes a vibration state detection device, the vibration isolation foundation includes an inner foundation and an outer foundation, the inner foundation is supported by hanging down in the outer foundation through the vibration isolation device, and the top of the outer foundation is higher than the top of the inner foundation, wherein the vibration state detection device includes a data acquisition module and a data analysis module connected to the data acquisition module, and the data acquisition module is connected to the outer foundation, the inner foundation and the vibration isolation device.

[0005] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, the inner foundation is T-shaped, and the outer foundation is U-shaped.

[0006] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, the external foundation includes a supporting part and a retaining wall, the supporting part is located inside the retaining wall, the supporting part surrounds to form a first accommodating space, the retaining wall surrounds to form a second accommodating space, and the inner foundation is accommodated within the first accommodating space and the second accommodating space.

[0007] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, the inner foundation includes an upper connecting portion and a lower hanging portion, the lower connecting portion is located in the first accommodating space, and the upper connecting portion is located in the second accommodating space.

[0008] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, a raft is arranged on the top of the supporting part, the upper connecting part is supported on the raft, and a gap is provided between the outer edge of the upper connecting part and the retaining wall.

[0009] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, a vibration reduction belt is provided at a position of the retaining wall corresponding to the inner foundation; and a concrete layer is provided on the raft slab.

[0010] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and testing, the inner foundation also includes an inner recessed portion, and the outer foundation also includes an outer recessed portion, the inner recessed portion is arranged at the lower hanging portion corresponding to the raft, and the outer recessed portion is arranged at the supporting portion along the periphery of the raft, and the space between the inner recessed portion, the outer recessed portion and the upper connecting portion forms a maintenance channel.

[0011] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, the data acquisition module includes a dynamic data acquisition instrument and an acceleration sensor, a displacement sensor and a camera respectively connected to the dynamic data acquisition instrument.

[0012] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and experiment, a vibration isolation pad is provided at the bottom end of the vibration isolation device.

[0013] In one embodiment of the above-mentioned vibration isolation system for automobile road simulation and testing, the inner foundation is a concrete foundation member with a built-in steel frame, and the inner foundation includes a connected bottom formwork steel plate and a side formwork steel plate, and the bottom formwork steel plate and / or the side formwork steel plate are connected to the steel frame.

[0014] The vibration isolation design method of the present invention is used for designing a vibration isolation system for automobile road simulation and experiment, and comprises the following steps:

[0015] S100, conduct preliminary scheme design based on site conditions and parameters, establish a non-vibration isolation foundation finite element model for dynamic analysis, and determine whether the foundation vibration response meets the requirements of the allowable vibration standard. If it does, vibration control is not required. If it does not, vibration control of the foundation is required.

[0016] S200, internal foundation structure selection and size design;

[0017] S300, design of the number and location distribution of vibration isolation devices;

[0018] S400, parameter optimization design of vibration isolation system;

[0019] S500, establishing an overall finite element model including the inner foundation, the outer foundation and the vibration isolation device, performing a frequency sweep analysis on the inner foundation and the outer foundation according to the excitation force spectrum of the actuator, and obtaining the vibration responses of the inner foundation and the outer foundation;

[0020] S600, seismic design of the vibration isolation device.

[0021] In one implementation of the above-mentioned vibration isolation design method, the inner foundation is arranged in a T-shape, the outer foundation is arranged in a U-shape, and the inner foundation is supported in the outer foundation by hanging down the vibration isolation device.

[0022] In one implementation of the above-mentioned vibration isolation design method, the step S300 includes: adjusting the position of each steel spring vibration isolator of the vibration isolation device so that the bearing capacity of each steel spring vibration isolator is consistent.

[0023] In one implementation of the above-mentioned vibration isolation design method, the step S300 includes:

[0024] S310, obtaining the number of steel spring vibration isolators according to the sum of the weight of the internal foundation and the upper equipment of the vibration table and the maximum bearing capacity of the steel spring vibration isolators, and evenly placing N steel spring vibration isolators according to the principle of symmetry;

[0025] S320, the bearing capacity of each steel spring vibration isolator is calculated through static analysis, and the placement of the steel spring vibration isolators is adjusted. At the position with higher bearing capacity, the steel spring vibration isolators are arranged relatively densely, and at the position with lower bearing capacity, the steel spring vibration isolators are arranged relatively sparsely;

[0026] S330, repeat step S320 until the bearing capacity of each steel spring isolator is consistent.

[0027] In one implementation of the above-mentioned vibration isolation design method, the center of gravity of the inner foundation and the steel spring vibration isolator of the vibration isolation device are arranged in a horizontal plane.

[0028] In one implementation of the above-mentioned vibration isolation design method, the vibration response of the inner foundation and the outer foundation and the deformation of the vibration isolation device are obtained, warning values ​​of the vibration response and the deformation are set, and an alarm is issued when the vibration response or the deformation exceeds the warning value.

[0029] The beneficial effect of the present invention is that the vibration isolation system and vibration isolation design method for automobile road simulation and experiment of the present invention can effectively reduce the negative impact caused by the resonance caused by the test system and the foundation, and reduce the dynamic response of the foundation to meet the working requirements of the normal operation of the mechanical system on the table. At the same time, the dynamic response of the external foundation will also be significantly reduced, and will not produce vibration effects on the surrounding environment.

[0030] In addition, the present invention adds a vibration monitoring system to obtain the vibration response of the internal and external foundations in real time, and sets an early warning mechanism to ensure the normal operation of the vibration isolation system.

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a cross-sectional view of an embodiment of the vibration isolation system for automobile road simulation and testing according to the present invention.

[0033] Figure 2 The structure diagram of an embodiment of the vibration isolation system for automobile road simulation and experiment of the present invention.

[0034] Figure 3 It is a partial cross-sectional view of an embodiment of the vibration isolation system for automobile road simulation and testing according to the present invention.

[0035] Figure 4 It is a partial cross-sectional view of an embodiment of the vibration isolation system for automobile road simulation and testing according to the present invention.

[0036] Figure 5 It is a step diagram of the vibration isolation design method of the present invention.

[0037] Figure 6 A diagram showing the steps of designing a vibration isolation device in the vibration isolation design method of the present invention;

[0038] Figure 7 The diagram is a top view of an embodiment of the load-bearing area of ​​the vibration isolation system for automobile road simulation and testing according to the present invention.

[0039] Figure 8 A top view of an embodiment of the vibration isolation device arrangement of the vibration isolation system for automobile road simulation and testing of the present invention.

[0040] Among them, the reference numerals

[0041] 100: Vibration Isolation Basics

[0042] 110: Internal foundation

[0043] 111: Upper connection

[0044] 112: Lower hanging part

[0045] 113: Concave part

[0046] 120: External foundation

[0047] 121: Supporting part

[0048] 122: Retaining Wall

[0049] 123: Raft

[0050] 124: Vibration damping belt

[0051] 200: Vibration isolation device

[0052] 210: Steel spring isolator

[0053] 220: Damper

[0054] 300: Vibration state detection device

[0055] 310: Data acquisition module

[0056] 320: Data Analysis Module

[0057] S1: first storage space

[0058] S2: Second storage space

[0059] P: Loading area DETAILED DESCRIPTION

[0060] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0061] References in the specification to "one embodiment", "an embodiment", "an example embodiment", etc., mean that the embodiment being described may include certain features, structures, or characteristics, but not every embodiment must include these certain features, structures, or characteristics. In addition, such statements do not refer to the same embodiment. Further, when a certain feature, structure, or characteristic is described in conjunction with an embodiment, it is indicated that it is within the knowledge of those skilled in the art to combine such feature, structure, or characteristic into other embodiments, whether or not it is explicitly described.

[0062] Certain words are used in the specification and subsequent claims to refer to specific components or parts. It should be understood by those skilled in the art that technical users or manufacturers may refer to the same component or part by different nouns or terms. This specification and subsequent claims do not use differences in names as a way to distinguish components or parts, but use differences in functions of components or parts as the criteria for distinction. "Including" and "comprising" mentioned throughout the specification and subsequent claims are open-ended terms and should be interpreted as "including but not limited to". In addition, the word "connected" here includes any direct and indirect means of connection.

[0063] Combination Figure 1 and Figure 2 The vibration isolation system for automobile road simulation and experiment of the present invention comprises a vibration isolation foundation 100, a vibration isolation device 200 and a vibration state detection device 300. The vibration isolation foundation 100 comprises an inner foundation 110 and an outer foundation 120. The inner foundation 110 is supported in the outer foundation 120 by hanging the vibration isolation device 200. The top of the outer foundation 120 is higher than the top of the inner foundation 110. The table equipment is supported on the inner foundation 110, and the outer foundation 120 is in direct contact with the soil. The vibration isolation device 200 has a low-frequency large load-bearing and large damping ratio, for example, including a steel spring vibration isolator 210, a damper 220 (such as Figure 8 shown).

[0064] Among them, the vibration state detection device 300 includes a data acquisition module 310 and a data analysis module 320 connected to the data acquisition module 310. The data acquisition module 310 is connected to the inner foundation 110, the outer foundation 120 and the vibration isolation device 300, and is used to obtain the vibration response of the inner foundation 110 and the outer foundation 120 and the deformation of the vibration isolation device 300. The data analysis module 320 is used to analyze whether the collected data exceeds the set warning value.

[0065] Among them, the inner foundation 110 is a large-volume steel concrete foundation with high rigidity. The outer foundation 120 has sufficient rigidity, and the inner foundation 110 adopts a hanging form to ensure that the mass and rigidity of the vibration isolation system overlap and reduce the rotation and overturning effects of the vibration isolation foundation 100. The design of the large-volume concrete vibration isolation foundation 100 can effectively reduce the vibration response of the foundation and reduce the impact of vibration diffusion and propagation to the surroundings. Reasonable design of the geometric shape of the vibration isolation foundation 100 can also increase the foundation stiffness and geometric damping ratio.

[0066] The vibration isolation device 200 uses a steel spring vibration isolator 210 and a damper 220 to provide sufficient damping, significantly reducing the resonance response of the foundation and attenuating external environmental vibration. During the equipment experiment, the vibration state detection device 300 is used to obtain the vibration response of the internal and external foundations and the deformation of the vibration isolator, and the warning value is set to ensure the normal use and safety of the vibration isolation system.

[0067] In some embodiments of the present invention, the inner foundation is T-shaped and the outer foundation is U-shaped. The mass of the inner foundation is, for example, greater than 3,000 tons. The T-shaped under-hanging design is used to ensure that the mass and rigidity of the vibration isolation system coincide, thereby reducing the influence of the rotational mode of the vibration isolation system. The outer foundation 120 is formed around the inner foundation 110 to form a U-shape in a cross-sectional view. Increasing the volume and mass of the outer foundation 120 can also effectively reduce the vibration response of the exciter to the foundation and the surrounding environment.

[0068] In detail, the external foundation 120 includes a supporting portion 121 and a retaining wall 122. The supporting portion 121 is located inside the retaining wall 122. The supporting portion 121 surrounds to form a first accommodating space S1, and the retaining wall 122 surrounds to form a second accommodating space S2. The overall cross-section of the first accommodating space S1 and the second accommodating space S2 is T-shaped.

[0069] The inner base 110 is accommodated in the first accommodation space S1 and the second accommodation space S2. The inner base 110 includes an upper connecting portion 111 and a lower hanging portion 112. The upper connecting portion 111 and the lower hanging portion 112 are connected in a T-shape, for example, and the upper connecting portion 111 and the lower hanging portion 112 are adjusted in height to achieve the overlap of the upper connecting portion 111 and the lower hanging portion 112. The upper connecting portion 111 is located in the second accommodation space S2, and the lower connecting portion 112 is located in the first accommodation space S1.

[0070] In some embodiments of the present invention, the inner foundation 110 is a concrete foundation member with a built-in steel frame to increase the overall rigidity of the structure. The inner foundation 110 includes a bottom form steel plate and a side form steel plate connected to each other, and the bottom form steel plate and / or the side form steel plate are connected to the built-in steel frame. That is, a steel plate is designed at the bottom and around the inner foundation 110, and the steel plate is welded to the steel frame. This layer of steel plate is used as the bottom form and side form for pouring concrete, eliminating the formwork process during traditional concrete pouring.

[0071] Among them, a raft 123 is arranged on the top of the supporting part 121 of the outer foundation 120, and the upper connecting part 111 of the inner foundation 110 is supported on the raft 123. There is a gap between the outer edge of the upper connecting part 111 of the inner foundation 110 and the retaining wall 122 of the outer foundation 120. The rigidity of the outer foundation 120 is large enough, and a raft 123 of concrete with a thickness of not less than 800mm is used. According to the foundation conditions, a pile foundation can be used when necessary to ensure the rigidity of the outer foundation 120 and reduce the adverse effects caused by the weak rigidity of the outer foundation. The retaining walls 122 around the outer foundation 120 are completely separated from the inner foundation 110, that is, the retaining walls 122 and the upper connecting part 111 shall not be connected in any way. Further, the gap width between the retaining wall 122 of the outer foundation 120 and the upper connecting part 111 of the inner foundation 110 is not less than 200mm. Preferably, a vibration-damping belt is provided at a position of the retaining wall 122 of the outer foundation 120 corresponding to the upper connection portion 111 of the inner foundation 110, for buffering the huge impact force generated by the collision between the outer foundation 110 and the inner foundation 110 during an occasional earthquake. The vibration-damping belt is, for example, a 50 mm thick polyurethane belt.

[0072] In some embodiments of the present invention, Figure 3 As shown, the outer foundation 120 includes a vibration-damping strip 124 disposed on a raft 123. The vibration-damping strip 124 is, for example, a resin concrete structure. The function of the resin concrete structure is to absorb vibration energy, provide damping and reduce vibration response.

[0073] Combination Figure 1 and Figure 3 In the vibration isolation system for automobile road simulation and experiment of the present invention, the inner foundation 110 further includes an inner recess 113, which is arranged at a position where the lower hanging part 112 corresponds to the raft 123 of the outer foundation 120. The outer foundation 120 further includes an outer recess 124, which is arranged at the outer periphery of the supporting part 121 along the raft 123, and the space between the inner recess 113, the outer recess 124 and the upper connecting part 111 forms a maintenance passage.

[0074] The data acquisition module 310 of the vibration state detection device 300 includes an acceleration sensor, a displacement sensor, a camera, a dynamic data acquisition instrument, etc. The maintenance channel is a maintenance channel reserved for manual operation and serves as the installation location of the camera real-time monitoring system of the data acquisition module 310 .

[0075] The steel spring vibration isolator 210 of the vibration isolation device 200 is designed through parameter optimization to determine the technical parameters of the steel spring vibration isolator, so that the frequency of the vibration isolation system is less than 1.5 Hz, the maximum bearing capacity of a single steel spring support reaches 80 tons, and the steel spring vibration isolator 210 has sufficient vertical and horizontal ultimate deformation capacity to ensure that it will not be damaged under the action of the fortified earthquake. The damping ratio of the damper 220 of the vibration isolation device 200 is greater than 20%.

[0076] The present invention arranges the steel spring isolators 210 according to the distribution of the upper load, optimizes the design of the vibration isolation system parameters, and controls the difference in the compression amount of each steel spring isolator 210 within 5%, so that each steel spring support deforms uniformly, and exerts the maximum vibration isolation performance of each steel spring isolator 210.

[0077] like Figure 5 As shown, the vibration isolation design method of the present invention is used for designing a vibration isolation system for automobile road simulation and experiment, and comprises the following steps:

[0078] S100, conduct preliminary scheme design based on site conditions and parameters, establish a non-vibration isolation foundation finite element model for dynamic analysis, and determine whether the foundation vibration response meets the requirements of the allowable vibration standard. If it does, vibration control is not required. If it does not, vibration control of the foundation is required.

[0079] In the present invention, according to the parameters of the simulation and experimental platform system, the geological conditions of the site, the installation location, the surrounding environment, and the allowable vibration standard, a preliminary design scheme of the foundation is proposed without considering the vibration isolation measures, including the plane size, burial depth and material of the foundation. According to the preliminary design scheme, a non-vibration isolation foundation finite element model including the influence of the soil is established, a vibration load is applied, a sweep frequency analysis or a dynamic time history analysis is performed on the foundation, and the vibration response (displacement, velocity and acceleration) of the top surface of the foundation is extracted. According to the allowable vibration standard of the foundation, it is judged whether the vibration response of the foundation meets the requirements of the allowable vibration standard. If it meets the requirements, vibration control is not required. Otherwise, vibration control of the foundation is required, and the vibration isolation system is designed in detail.

[0080] S200, internal foundation 110 structure selection and size design.

[0081] S300, the number and position distribution of the vibration isolation devices 200 are designed.

[0082] According to the principle of mass-rigidity overlap, an appropriate mass ratio, and combined with the initially selected parameters of the steel spring isolator, the inner foundation 110 is designed, its geometric shape and size are determined, and the center of mass of the inner foundation 110 is calculated.

[0083] Steel spring isolators are very suitable for use in this scenario because they have the characteristics of high load-bearing capacity and can support large-mass vibration isolation foundations. They also have a long service life and are relatively easy to inspect and maintain. In order to minimize the impact of resonance, steel spring isolators should be designed to be low-frequency if practical conditions permit. This can reduce the natural frequency of the entire vibration isolation system and reduce the value of vibration acceleration. Through reasonable design, the vibration isolation frequency of steel spring isolators can reach below 1.5Hz. At the same time, a large proportion of dampers are used to reduce high-frequency vibration responses.

[0084] The design of the vibration isolation system mainly focuses on the shape of the inner and outer foundations, the design parameters and selection of the steel spring isolator 210 and the damper 220. Usually for the inner foundation 110, the T-shaped bottom-hanging concrete inner foundation can not only facilitate the placement of the steel spring isolator 210 and the damper 220, but also help to ensure that the center of gravity of the inner foundation 110 and the steel spring isolator 210 are in the same horizontal plane, that is, to achieve mass-rigidity overlap, which helps to avoid the rotation effect and overturning effect of the inner foundation 110 and reduce the vibration response of the inner foundation 110. Although the exciting force of the automobile road simulation equipment is generally in the vertical direction, if the principle of mass-rigidity overlap is not met, the inner foundation 110 will also produce a horizontal vibration response. Therefore, it is necessary to reduce the impact of the horizontal vibration response through the design of the foundation shape.

[0085] The mass of the inner foundation 110 is generally 10-50 times the mass of the tabletop equipment. A large foundation can significantly reduce the vibration response of the foundation. In addition, if site conditions permit, the inner foundation 110 can be designed to be relatively flat, which can increase the geometric damping of the foundation. The stiffness of the outer foundation 120 is a key factor in the functioning of the entire vibration isolation system. The stiffness of the outer foundation 120 should be large enough. Generally, the stiffness of the outer foundation 120 should be greater than 25 times the stiffness of the vibration isolation system. Conventionally, a concrete raft 123 of not less than 800 mm thick is used. If it does not meet the requirements, a pile foundation can be used.

[0086] The layout of the steel spring isolators 210 is also a very important link. It is necessary to effectively reduce the vibration response of the vibration isolation system and to ensure that the compression of each steel spring isolator 210 is consistent as much as possible. In the design of steel springs and dampers, the principle of symmetry is a basic design requirement. The mass of the inner foundation 110 is obtained according to the size of the inner foundation 110, and then the number and position of the steel spring isolators 210 are determined according to the total mass of the inner foundation 110, the upper platform and the test piece, and the bearing capacity of the steel spring isolators 210.

[0087] S400, parameter optimization design of vibration isolation system. Change the stiffness, damping ratio and mass ratio of the vibration isolation system, analyze the influence of the parameters of the vibration isolation system on the foundation vibration response, and select the optimal stiffness, damping ratio and mass ratio of the vibration isolation system.

[0088] The overall stiffness and damping ratio of the vibration isolation system are mainly adjusted by the steel spring vibration isolator 210. The stiffness and damping ratio of the steel spring vibration isolator 210 are adjusted in the calculation model for verification analysis. The mass ratio of the vibration isolation system mainly refers to the ratio of the mass of the concrete participating in the vibration of the vibration isolation system to the exciting force, which is usually 50 to 500 times. The optimal mass ratio is found within this range.

[0089] S500, establishing an overall finite element model including the inner foundation 110, the outer foundation 120 and the vibration isolation device 200, performing a frequency sweep analysis on the inner foundation 110 and the outer foundation 120 according to the excitation force spectrum of the actuator, and obtaining the vibration responses of the inner foundation 110 and the outer foundation 120.

[0090] After completing the preliminary design of the vibration isolation system, finite element modeling and dynamic analysis are performed. If the vibration response still exceeds the specification requirements, the vibration isolation system needs to be re-optimized, that is, return to step S200 and adjust the frequency, damping ratio and foundation stiffness of the vibration isolation foundation accordingly until the design requirements are met.

[0091] S600, performing earthquake-resistant design on the vibration isolation device 200.

[0092] Finally, the seismic design of the vibration isolation system is carried out, including dynamic analysis under design earthquakes and rare earthquakes, and verification of the ultimate deformation capacity of the vibration isolator. If the deformation capacity requirements of the steel spring vibration isolator 210 are not met, seismic measures need to be applied to ensure that the seismic performance of the vibration isolation system meets the requirements.

[0093] S700, monitor the operation and maintenance of the vibration isolation system, obtain the vibration response of the inner foundation 110 and the outer foundation 120 and the deformation of the vibration isolation device 200 in real time, set warning values ​​for the vibration response and deformation, and issue an alarm when the vibration response or deformation exceeds the warning value.

[0094] Wherein, step S300 includes: adjusting the position of each steel spring vibration isolator 210 of the vibration isolation device 200 so that the bearing capacity of each steel spring vibration isolator 210 is consistent. The number and position of the steel spring vibration isolator 210 are determined by the maximum bearing capacity of a single steel spring vibration isolator 210. In detail, Figures 6 to 8 As shown, step S300 includes:

[0095] S310, according to the sum of the weight of the inner foundation 110 and the upper equipment of the vibration table and the maximum bearing capacity of the steel spring vibration isolator 210, the number of steel spring vibration isolators 210 is obtained, the bearing area P is evenly divided into N parts, and N steel spring vibration isolators 210 are evenly placed according to the principle of symmetry;

[0096] S320, calculating the bearing capacity of each steel spring vibration isolator 210 through static analysis, adjusting the placement position of the steel spring vibration isolator 210, arranging the steel spring vibration isolators 210 to be relatively densely placed at a position with a higher bearing capacity, and arranging the steel spring vibration isolators 210 to be relatively sparsely placed at a position with a lower bearing capacity;

[0097] S330, repeat step S320 until the bearing capacity of each steel spring isolator 210 is consistent.

[0098] Among them, by optimization, the bearing capacity of each steel spring isolator 210 is made consistent, or the error between the bearing capacities of the steel spring isolators 210 is less than 0.1%, which can be regarded as the bearing capacity of the steel spring isolators 210 being consistent. The vibration table foundation requires steel spring isolators 210 to reduce the vibration response and control the maximum acceleration and displacement. When the number of steel spring isolators 210 is determined, the position of the steel spring isolators 210 is adjusted to make the bearing capacity of each steel spring isolator 210 consistent, so that each steel spring isolator 210 can exert the maximum vibration isolation performance.

[0099] For example, if Figure 1 , Figure 7 and Figure 8 As shown, the outer foundation 120 is directly connected to the soil, and a steel spring isolator 210 is placed at the supporting position between the inner foundation 110 and the outer foundation 120. The steel spring isolator 210 needs to bear the weight of the inner foundation 110 and the equipment on the upper part of the vibration table. Ideally, the weight carried by each steel spring isolator 210 is the sum of the weight of the upper foundation divided by N. Alternatively, the sum of the bearing capacity should be 10%-20% higher than the total weight of the inner foundation and the vibration equipment as a margin. The total upper mass is approximately 4,600 tons, and each selected steel spring isolator 210 can bear 871kN. It is calculated that 52 steel spring isolators 210 are required to bear the weight of the upper foundation and the equipment. A certain margin is retained, and a total of 54 steel spring isolators 210 are selected for this vibration table.

[0100] The initial placement of the steel spring isolators 210 is to evenly place 54 steel spring isolators 210 in the annular bearing area P according to the principle of symmetry, that is, to divide the steel spring supports of the steel spring isolators 210 into 54 areas according to the area. The bearing capacity of the steel spring isolators 210 at each position can be obtained through static calculation. In general, the weight carried by the steel spring isolators 210 at the center of the long side is higher than that of the steel spring isolators 210 at the corners.

[0101] The second time the steel spring isolators 210 are placed, the steel spring isolators 210 are placed densely at the position with higher bearing capacity, that is, the center of the long side, and the steel spring isolators 210 at the corners are placed sparsely. The number of steel spring isolators 210 remains unchanged, and only the position is adjusted.

[0102] The steel spring isolator 210 is placed for the third time, and the adjustment method is similar to the second time.

[0103] In this way, iterations are performed until the positions of 54 steel spring isolators 210 are found, so that the load-bearing capacity of each steel spring isolator 210 is consistent.

[0104] During the construction of the steel spring vibration isolator 210, a rubber anti-slip pad can be added to the bottom of the steel spring vibration isolator 210. The friction coefficient of the anti-slip pad is more than 1.5 times. Under the action of an earthquake, the horizontal reaction force of the steel spring support is less than the friction coefficient multiplied by the axial pressure of the steel spring support, ensuring that the support does not slip horizontally.

[0105] The addition of the seismic isolation pad is conducive to fixing the steel spring isolator 210, which is simple to construct, can effectively reduce the horizontal displacement of the steel spring isolator 210, and increase the vibration isolation effect, which is also conducive to the later replacement and maintenance of the support. Of course, in other embodiments, the steel spring isolator 210 can also be fixed to the inner and outer foundations with anchor bolts.

[0106] The present invention is applied, for example, to projects where the starting frequency of the actuator of the experimental platform is less than 1 Hz, the total excitation of the actuator is greater than 2000 kN, and there is a risk of causing excessive vibration of the foundation and the surrounding environment. The present invention can greatly improve the vibration control effect of the foundation of the automobile road simulation vibration table. The operating frequency of the automobile road simulation and test platform is generally 0-50 Hz, and the vibration load generated is generally vertical. The frequency of the vibration isolation system is less than 1.5 Hz, and the damping ratio is greater than 0.2, which can reduce the resonance response of the foundation. The natural frequency of the foundation in the concrete is generally greater than 50 Hz. When working normally, the vibration table will not excite the mode of the foundation itself, avoiding resonance with the foundation itself. The foundation outside the vibration table is directly connected to the soil, and the soil also has a certain elasticity and shock absorption effect. The acceleration of the foundation outside the vibration table can be controlled within 0.02g, meeting the design requirements of relevant design specifications. With the development of the automobile industry, the demand for automobile road simulation vibration tables will also increase. This product can meet the vibration isolation system design of almost all such vibration tables.

[0107] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A vibration isolation system for automobile road simulation and experiment, comprising a vibration isolation foundation and a vibration isolation device, characterized in that: It also includes a vibration state detection device, the vibration isolation foundation includes an inner foundation and an outer foundation, the inner foundation is supported by hanging from the outer foundation through the vibration isolation device, and the top of the outer foundation is higher than the top of the inner foundation, wherein the vibration state detection device includes a data acquisition module and a data analysis module connected to the data acquisition module, and the data acquisition module is connected to the outer foundation, the inner foundation and the vibration isolation device.

2. The vibration isolation system for automobile road simulation and experiment according to claim 1, characterized in that: The inner foundation is T-shaped, and the outer foundation is U-shaped.

3. The vibration isolation system for automobile road simulation and experiment according to claim 1 or 2, characterized in that: The outer foundation includes a supporting part and a retaining wall, the supporting part is located inside the retaining wall, the supporting part surrounds to form a first accommodating space, the retaining wall surrounds to form a second accommodating space, and the inner foundation is accommodated in the first accommodating space and the second accommodating space.

4. The vibration isolation system for automobile road simulation and experiment according to claim 3 is characterized in that: The inner foundation includes an upper connecting portion and a lower hanging portion, the lower connecting portion is located in the first accommodating space, and the upper connecting portion is located in the second accommodating space.

5. The vibration isolation system for automobile road simulation and experiment according to claim 4, characterized in that: A raft is arranged on the top of the supporting part, the upper connecting part is supported on the raft, and a gap is provided between the outer edge of the upper connecting part and the retaining wall.

6. The vibration isolation system for automobile road simulation and experiment according to claim 5, characterized in that: A vibration-damping belt is arranged at a position of the retaining wall corresponding to the inner foundation; and a concrete layer is arranged on the raft slab.

7. The vibration isolation system for automobile road simulation and experiment according to claim 5, characterized in that: The inner foundation also includes an inner recessed portion, and the outer foundation also includes an outer recessed portion. The inner recessed portion is arranged at the lower hanging portion corresponding to the raft plate, and the outer recessed portion is arranged at the supporting portion along the periphery of the raft plate. The space between the inner recessed portion, the outer recessed portion and the upper connecting portion forms a maintenance channel.

8. The vibration isolation system for automobile road simulation and experiment according to any one of claims 1 to 7, characterized in that: The data acquisition module includes a dynamic data acquisition instrument and an acceleration sensor, a displacement sensor and a camera respectively connected to the dynamic data acquisition instrument.

9. The vibration isolation system for automobile road simulation and experiment according to any one of claims 1 to 7, characterized in that: A vibration isolation pad is arranged at the bottom end of the vibration isolation device.

10. The vibration isolation system for automobile road simulation and experiment according to any one of claims 1 to 7, characterized in that: The inner foundation is a concrete foundation member with a built-in steel frame. The inner foundation includes a bottom formwork steel plate and a side formwork steel plate connected to each other. The bottom formwork steel plate and / or the side formwork steel plate are connected to the steel frame.

11. A vibration isolation design method for designing a vibration isolation system for automobile road simulation and experiment, characterized in that: The steps include: S100, conduct preliminary scheme design based on site conditions and parameters, establish a non-vibration isolation foundation finite element model for dynamic analysis, and determine whether the foundation vibration response meets the requirements of the allowable vibration standard. If it does, vibration control is not required. If it does not, vibration control of the foundation is required. S200, internal foundation structure selection and size design; S300, design of the number and location distribution of vibration isolation devices; S400, parameter optimization design of vibration isolation system; S500, establishing an overall finite element model including the inner foundation, the outer foundation and the vibration isolation device, performing a frequency sweep analysis on the inner foundation and the outer foundation according to the excitation force spectrum of the actuator, and obtaining the vibration responses of the inner foundation and the outer foundation; S600, seismic design of the vibration isolation device.

12. The vibration isolation design method according to claim 11, characterized in that: The inner foundation is arranged in a T shape, and the outer foundation is arranged in a U shape, and the inner foundation is supported in the outer foundation by hanging down through a vibration isolation device.

13. The vibration isolation design method according to claim 11, characterized in that: The step S300 includes: adjusting the position of each steel spring isolator of the vibration isolation device so that the bearing capacity of each steel spring isolator is consistent.

14. The vibration isolation design method according to claim 13, characterized in that: The step S300 includes: S310, obtaining the number of steel spring vibration isolators according to the sum of the weight of the internal foundation and the upper equipment of the vibration table and the maximum bearing capacity of the steel spring vibration isolators, and evenly placing N steel spring vibration isolators according to the principle of symmetry; S320, the bearing capacity of each steel spring vibration isolator is calculated through static analysis, and the placement of the steel spring vibration isolators is adjusted. At the position with higher bearing capacity, the steel spring vibration isolators are arranged relatively densely, and at the position with lower bearing capacity, the steel spring vibration isolators are arranged relatively sparsely; S330, repeat step S320 until the bearing capacity of each steel spring isolator is consistent.

15. The vibration isolation design method according to claim 11, characterized in that: The center of gravity of the inner foundation and the steel spring isolator of the vibration isolation device are arranged in a horizontal plane.

16. The vibration isolation design method according to claim 11, characterized in that: Obtain the vibration response of the inner foundation and outer foundation and the deformation of the vibration isolation device, set the warning values ​​of the vibration response and deformation, and issue an alarm when the vibration response or deformation exceeds the warning value.

Images