Resonance test composite support system

Abstract

The invention discloses a composite support system for a resonance test. The composite support system comprises a movable platform, a top cover, an air bag, a bottom cover, a support piece, a base, a guide module and a limiting module, the supporting piece comprises a first fixing ring, a connecting cylinder and a second fixing ring; the limiting module comprises Q limiting units which are uniformly arranged in the circumferential direction of the base; the limiting unit comprises a fixing plate, a limiting plate and a limiting sliding rod. Adjustment of supporting rigidity, strength and frequency can be achieved by selecting different types of air bags so as to meet supporting requirements of various load working conditions, modal decoupling and vibration suppression can be accurately achieved, multi-dimensional movement is accurate, and the ultra-low-frequency dynamic response characteristic and multi-working-condition compatibility are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation structure dynamics testing, and in particular to a resonance test composite support system. Background Art

[0002] Vibration control technology is one of the core topics in aerospace engineering. Its development history can be traced back to the dynamic response research of aircraft structures in the early 20th century. Vibration is widely present in engineering, but in many cases, vibration is undesirable and destructive to the safety and accuracy of mechanical equipment such as on-orbit spacecraft, high-precision instruments and vehicles. As aircraft develop towards high speed, lightweight and high maneuverability, the coupling problem of complex aeroelastic effects and structural dynamics has become increasingly prominent. Full-aircraft ground resonance testing has become a key means to verify the structural integrity and safety of aircraft. Early vibration suppression technologies mainly relied on linear vibration isolation elements (such as metal springs and hydraulic dampers), but their dynamic characteristics were limited by the natural frequency bandwidth, making it difficult to effectively isolate low-frequency vibration interference.

[0003] As a typical nonlinear vibration isolation element, air springs have become a research hotspot in the field of vibration control due to their advantages, including adjustable stiffness, strong load-bearing capacity, and controllable damping characteristics. Their operating principle is based on the volume-pressure characteristics of a closed air cavity. By adjusting the air pressure, nonlinear stiffness can be varied, thereby adapting to the dynamic response requirements under different load conditions. Research has shown that air springs have excellent vibration isolation performance within a certain frequency range.

[0004] Traditional support systems for full-aircraft ground resonance tests mostly use rigid supports or simple vibration isolation devices, which have the following technical bottlenecks: First, modal coupling interference, the rigid body mode of the support system overlaps with the aircraft's elastic mode frequency domain, resulting in increased modal parameter identification errors; second, dynamic response is limited, conventional support structures cannot take into account both ultra-low frequency vibration isolation and large load bearing requirements, and lack adaptability to test conditions; third, stiffness adjustment is rigid, and the existing system relies on mechanical adjustment to achieve stiffness changes, with slow response speed and low accuracy, which cannot meet the testing needs of multi-configuration aircraft. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a resonance test composite support system in view of the defects involved in the background technology.

[0006] The present invention adopts the following technical solutions to solve the above technical problems: A composite support system for a resonance test, comprising a movable platform, a top cover, an airbag, a bottom cover, a support member, a base, a guide module and a limit module; The movable platform is a hollow cylinder with an open lower end and a closed upper end, and its upper end surface is used to carry the test product of the resonance test; The top cover is disc-shaped, and the bottom cover is annular; the airbag is vertically arranged, with its upper end coaxially and tightly connected to the lower end surface of the top cover, and its lower end coaxially and firmly connected to the upper end surface of the bottom cover; The base is a hollow cylinder with an open upper end and a closed lower end; The support member includes a first fixing ring, a connecting tube, and a second fixing ring; the connecting tube is a hollow cylinder with two ends open; the first fixing ring and the second fixing ring are both annular; the upper end of the connecting tube is coaxially fixedly connected to the inner wall of the first fixing ring, and the lower end is coaxially fixedly connected to the outer wall of the second fixing ring; The base is uniformly provided with M support rods circumferentially around its axis, with the lower ends of the support rods being vertically fixed to the bottom wall thereof, where M is a natural number greater than or equal to 3; the upper ends of the M support rods are vertically fixed to the second fixing ring, so that the second fixing ring is located inside the base and coaxial with the base; The outer wall of the first fixing ring and the upper end of the base are coaxially and tightly fixedly connected; The lower end surface of the bottom cover and the upper end surface of the first fixing ring are coaxially fixedly connected, so that the top cover, the airbag, the bottom cover, the support member, and the base form a closed cavity, and a gap is left between the airbag and the connecting tube; The outer wall of the base is evenly provided with N vertical grooves in the circumferential direction, and each groove is provided with P identical blind holes, where N is a natural number greater than or equal to 3, and P is a natural number greater than or equal to 1; The guide module comprises N guide units corresponding one-to-one to the N grooves on the outer wall of the base; The guide unit includes P balls, and the P balls of the guide unit are arranged in P blind holes in their corresponding grooves in a one-to-one correspondence, and a portion of the balls is exposed from the blind holes in which they are located; The side wall of the movable platform is sleeved outside the base, containing the airbag inside, and the inner wall of the side wall of the movable platform and the balls of the N guide units are pressed against each other, so that the movable platform can slide freely up and down relative to the base; The closed end of the movable platform is coaxially fixedly connected to the top cover; The limiting module includes Q limiting units, where Q is a natural number greater than or equal to 3; The Q limiting units are evenly arranged around the circumference of the base, and each includes a fixed plate, a limiting plate and a limiting sliding rod; The fixing plate is fixedly connected to the side wall of the base and is coplanar with the bottom wall of the base; The limiting plate and the fixing plate are vertically fixedly connected, and a vertical strip-shaped through groove is provided on the limiting plate; One end of the limiting slide is vertically fixed to the side wall of the movable platform, and the other end passes through the strip through slot on the limiting plate; the limiting slide is used to cooperate with the strip through slot on the limiting plate, so that the movable platform can only slide up and down relative to the base.

[0007] As a further optimization solution of the composite support system for a resonance test of the present invention, m first bolt holes are uniformly provided circumferentially on the closed end of the movable platform, where m is a natural number greater than or equal to 3; m second bolt holes are provided circumferentially on the top cover, corresponding one-to-one to the first bolt holes, and the second bolt holes and their corresponding first bolt holes are fixed by bolts, so that the top cover and the closed end of the movable platform are coaxially fixedly connected; The second fixing ring is evenly provided with n third bolt holes in the circumferential direction, where n is a natural number greater than or equal to 3; the bottom cover is provided with n fourth bolt holes in the circumferential direction corresponding to the third bolt holes one by one, and the fourth bolt holes and their corresponding third bolt holes are fixed by bolts, so that the bottom cover and the second fixing ring are coaxially fixed.

[0008] As a further optimization solution of the resonance test composite support system of the present invention, the airbag adopts a hyperbolic rubber bag.

[0009] As a further optimization solution of the resonance test composite support system of the present invention, M=8, N=8, P=4, Q=4.

[0010] As a further optimization solution of the composite support system for resonance testing of the present invention, the movable platform, top cover, bottom cover, support member and base are all made of No. 45 steel.

[0011] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects: 1. Precise modal decoupling and vibration suppression: Through the synergistic effect of the airbag's nonlinear stiffness characteristics and the composite support structure, the rigid body mode of the support system and the elastic mode of the test product are effectively separated, avoiding frequency domain overlap problems; 2. Ultra-low frequency dynamic response characteristics: The variable volume pressure control mechanism of the airbag-enclosed air cavity breaks through the frequency bandwidth limitations of traditional linear vibration isolation components; 3. Intelligent Adaptive Stiffness Adjustment: By selecting different airbag models and matching top and bottom covers, the support stiffness can be adjusted to meet the support requirements of various load conditions. This only requires that the specifications of the second bolt hole on the top cover and the fourth bolt hole on the bottom cover are consistent. Compared with mechanical adjustment methods, the adjustment efficiency is improved. 4. Multi-dimensional motion precision control: The guide module and limit module are used in conjunction to achieve longitudinal displacement constraint while ensuring the vertical motion accuracy of single degree of freedom; 5. High reliability structural design: key load-bearing components are made of 45# steel, which reduces the system stiffness attenuation rate and extends the service life; 6. Multi-condition compatibility: Through the quick-change interface design of the top and bottom covers, combined with the variable topology layout of the base support rods, the system can adapt to a variety of typical test conditions, such as aircraft landing gear retraction and extension, and center of mass shift caused by fuel consumption, shortening the switching time between working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the explosion structure of the present invention.

[0013] In the figure, 1-movable platform, 2-top cover, 3-airbag, 4-bottom cover, 5-support member, 6-base, 7-fixing plate, 8-limiting plate, 9-limiting slide bar. DETAILED DESCRIPTION

[0014] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings: The present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make this disclosure thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the accompanying drawings, components are enlarged for clarity.

[0015] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, components, and / or parts, these elements, components, and / or parts are not limited by these terms. These terms are merely used to distinguish elements, components, and / or parts from each other. Therefore, the first element, component, and / or part discussed below can become the second element, component, or part without departing from the teachings of the present invention.

[0016] like Figure 1 、 Figure 2 As shown, the present invention discloses a composite support system for resonance testing, comprising a movable platform, a top cover, an airbag, a bottom cover, a support member, a base, a guide module and a limit module; The movable platform is a hollow cylinder with an open lower end and a closed upper end, and its upper end surface is used to carry the test product of the resonance test; The top cover is disc-shaped, and the bottom cover is annular; the airbag is vertically arranged, with its upper end coaxially and tightly connected to the lower end surface of the top cover, and its lower end coaxially and firmly connected to the upper end surface of the bottom cover; The base is a hollow cylinder with an open upper end and a closed lower end; The support member includes a first fixing ring, a connecting tube, and a second fixing ring; the connecting tube is a hollow cylinder with two ends open; the first fixing ring and the second fixing ring are both annular; the upper end of the connecting tube is coaxially fixedly connected to the inner wall of the first fixing ring, and the lower end is coaxially fixedly connected to the outer wall of the second fixing ring; The base is uniformly provided with M support rods circumferentially around its axis, with the lower ends of the support rods being vertically fixed to the bottom wall thereof, where M is a natural number greater than or equal to 3; the upper ends of the M support rods are vertically fixed to the second fixing ring, so that the second fixing ring is located inside the base and coaxial with the base; The outer wall of the first fixing ring and the upper end of the base are coaxially and tightly fixedly connected; The lower end surface of the bottom cover and the upper end surface of the first fixing ring are coaxially fixedly connected, so that the top cover, the airbag, the bottom cover, the support member, and the base form a closed cavity, and a gap is left between the airbag and the connecting tube; The outer wall of the base is evenly provided with N vertical grooves in the circumferential direction, and each groove is provided with P identical blind holes, where N is a natural number greater than or equal to 3, and P is a natural number greater than or equal to 1; The guide module comprises N guide units corresponding one-to-one to the N grooves on the outer wall of the base; The guide unit includes P balls, and the P balls of the guide unit are arranged in P blind holes in their corresponding grooves in a one-to-one correspondence, and a portion of the balls is exposed from the blind holes in which they are located; The side wall of the movable platform is sleeved outside the base, containing the airbag inside, and the inner wall of the side wall of the movable platform and the balls of the N guide units are pressed against each other, so that the movable platform can slide freely up and down relative to the base; The closed end of the movable platform is coaxially fixedly connected to the top cover; The limiting module includes Q limiting units, where Q is a natural number greater than or equal to 3; The Q limiting units are evenly arranged around the circumference of the base, and each includes a fixed plate, a limiting plate and a limiting sliding rod; The fixing plate is fixedly connected to the side wall of the base and is coplanar with the bottom wall of the base; The limiting plate and the fixing plate are vertically fixedly connected, and a vertical strip-shaped through groove is provided on the limiting plate; One end of the limiting slide is vertically fixed to the side wall of the movable platform, and the other end passes through the strip through slot on the limiting plate; the limiting slide is used to cooperate with the strip through slot on the limiting plate, so that the movable platform can only slide up and down relative to the base.

[0017] The closed end of the movable platform is provided with m first bolt holes uniformly circumferentially, where m is a natural number greater than or equal to 3; the top cover is provided with m second bolt holes circumferentially corresponding to the first bolt holes, and the second bolt holes and their corresponding first bolt holes are fixed by bolts, so that the top cover and the closed end of the movable platform are coaxially fixedly connected; The second fixing ring is evenly provided with n third bolt holes in the circumferential direction, where n is a natural number greater than or equal to 3; the bottom cover is provided with n fourth bolt holes in the circumferential direction corresponding to the third bolt holes one by one, and the fourth bolt holes and their corresponding third bolt holes are fixed by bolts, so that the bottom cover and the second fixing ring are coaxially fixed.

[0018] The airbag preferably adopts a hyperbolic rubber bag, M is preferably 8, N is preferably 8, P is preferably 4, and Q is preferably 4.

[0019] The movable platform, top cover, bottom cover, support member and base are preferably made of No. 45 steel.

[0020] When the present invention is applied, it can be equipped with a full ground support system with a resonance test composite support system, which is mainly composed of the present invention and an aircraft. A common three resonance test composite support systems meet the test requirements of the full ground support system. It is generally used for load-bearing and vibration reduction of aircraft landing gear. The main wheels of the landing gear fall on a movable platform. When disturbed, the displacement deformation of the movable platform can be controlled within a certain range, and the support frequency can be controlled to be lower than the required requirements as needed. The resonance test composite support system is located under the front and rear wheels. The appropriate airbag model is selected according to the load of the front and rear wheels to design the support system to ensure low-frequency support performance.

[0021] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0022] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A resonance test composite support system, characterized in that: It includes a movable platform, a top cover, an airbag, a bottom cover, a support, a base, a guide module and a limit module; The movable platform is a hollow cylinder with an open lower end and a closed upper end, and its upper end surface is used to carry the test product of the resonance test; The top cover is disc-shaped, and the bottom cover is annular; the airbag is vertically arranged, with its upper end coaxially and tightly connected to the lower end surface of the top cover, and its lower end coaxially and firmly connected to the upper end surface of the bottom cover; The base is a hollow cylinder with an open upper end and a closed lower end; The support member includes a first fixing ring, a connecting tube, and a second fixing ring; the connecting tube is a hollow cylinder with two ends open; the first fixing ring and the second fixing ring are both annular; the upper end of the connecting tube is coaxially fixedly connected to the inner wall of the first fixing ring, and the lower end is coaxially fixedly connected to the outer wall of the second fixing ring; The base is uniformly provided with M support rods circumferentially around its axis, with the lower ends of the support rods being vertically fixed to the bottom wall thereof, where M is a natural number greater than or equal to 3; the upper ends of the M support rods are vertically fixed to the second fixing ring, so that the second fixing ring is located inside the base and coaxial with the base; The outer wall of the first fixing ring and the upper end of the base are coaxially and tightly fixedly connected; The lower end surface of the bottom cover and the upper end surface of the first fixing ring are coaxially fixedly connected, so that the top cover, the airbag, the bottom cover, the support member, and the base form a closed cavity, and a gap is left between the airbag and the connecting tube; The outer wall of the base is evenly provided with N vertical grooves in the circumferential direction, and each groove is provided with P identical blind holes, where N is a natural number greater than or equal to 3, and P is a natural number greater than or equal to 1; The guide module comprises N guide units corresponding one-to-one to the N grooves on the outer wall of the base; The guide unit includes P balls, and the P balls of the guide unit are arranged in P blind holes in their corresponding grooves in a one-to-one correspondence, and a portion of the balls is exposed from the blind holes in which they are located; The side wall of the movable platform is sleeved outside the base, containing the airbag inside, and the inner wall of the side wall of the movable platform and the balls of the N guide units are pressed against each other, so that the movable platform can slide freely up and down relative to the base; The closed end of the movable platform is coaxially fixedly connected to the top cover; The limiting module includes Q limiting units, where Q is a natural number greater than or equal to 3; The Q limiting units are evenly arranged around the circumference of the base, and each includes a fixed plate, a limiting plate and a limiting sliding rod; The fixing plate is fixedly connected to the side wall of the base and is coplanar with the bottom wall of the base; The limiting plate and the fixing plate are vertically fixedly connected, and a vertical strip-shaped through groove is provided on the limiting plate; One end of the limiting slide is vertically fixed to the side wall of the movable platform, and the other end passes through the strip through slot on the limiting plate; the limiting slide is used to cooperate with the strip through slot on the limiting plate, so that the movable platform can only slide up and down relative to the base.

2. The resonance test composite support system according to claim 1, characterized in that: The closed end of the movable platform is provided with m first bolt holes uniformly circumferentially, where m is a natural number greater than or equal to 3; the top cover is provided with m second bolt holes circumferentially corresponding to the first bolt holes, and the second bolt holes and their corresponding first bolt holes are fixed by bolts, so that the top cover and the closed end of the movable platform are coaxially fixedly connected; The second fixing ring is evenly provided with n third bolt holes in the circumferential direction, where n is a natural number greater than or equal to 3; the bottom cover is provided with n fourth bolt holes in the circumferential direction corresponding to the third bolt holes one by one, and the fourth bolt holes and their corresponding third bolt holes are fixed by bolts, so that the bottom cover and the second fixing ring are coaxially fixed.

3. The resonance test composite support system according to claim 1, characterized in that: The airbag is a hyperbolic rubber bag.

4. The resonance test composite support system according to claim 1, characterized in that: The M=8, N=8, P=4, Q=4.

5. The resonance test composite support system according to claim 1, characterized in that: The movable platform, top cover, bottom cover, support member and base are all made of 45# steel.

Images