CN101504051A - Semi-active vibration-isolating platform employing magnetorheological damping technology - Google Patents

Abstract

The invention discloses a semi-active vibration isolation platform using magnetorheological damping technology, which relates to a semi-active vibration isolation platform. The purpose of the invention is to solve the problems of insufficient reliability and heavy mass increase of the existing active and passive integrated star vibration isolators. At least three elastic support rods are installed between the upper platform and the lower platform of the present invention. The middle part of the magneto-rheological damper is bent into an outwardly convex arc shape; each magneto-rheological damper is installed in the arc formed by the middle part of the corresponding elastic support rod, and its upper end and lower end are connected with the elastic support rod through the hinge. Hinged, the first radial plate is installed on the inner wall of the upper platform, the second radial plate is installed on the inner wall of the lower platform, the upper sleeve and the lower sleeve are fitted together, the upper end of the upper sleeve is fixed to the first radial plate, and the lower The lower end of the sleeve is fixedly connected with the second spoke plate. The invention reduces the quality of the vibration isolation platform and improves the reliability.

Description

Semi-active vibration isolation platform using magnetorheological damping technology

technical field

The invention relates to a semi-active vibration isolation platform.

Background technique

The worst environment in the life cycle of the satellite is the vibration environment during the launch process, during which it is subjected to various loads. The harsh vibration environment is often the main cause of damage to the satellite. Improving the vibration environment during the satellite launch process is to improve the satellite An important measure of launch safety and reliability. The connection interface between the traditional vehicle and the satellite is the star-rocket connection adapter, which usually adopts a conical shell structure with low damping and high rigidity, which makes it possible to transfer almost all static and dynamic loads from the vehicle. Degrade the performance and reliability of the satellite. By integrating the vibration isolation and damping functions in the satellite-rocket connection adapter structure, the vibration load acting on the satellite can be effectively reduced, and the satellite's entire satellite vibration reduction and vibration isolation can be realized. The entire satellite vibration isolation is to use a vibration isolator to replace the traditional star-rocket connection adapter, thereby reducing the vibration load on the satellite when the rocket is launched. The research on whole-satellite vibration isolation technology began in the early 1990s, and so far, passive whole-satellite vibration isolation technology has achieved certain results. Passive vibration isolation works well for high-frequency vibration isolation, but has insufficient control over low-frequency resonance responses. Active vibration isolation and semi-active vibration isolation have a significant effect on suppressing the satellite's low-frequency resonance, but active vibration isolation and semi-active vibration isolation have more additional components, which reduces their reliability and increases their mass. In short, the current whole-satellite vibration isolation technology is still in the development stage, and active and passive integrated vibration isolation technology has gradually received attention. However, the existing active-passive integrated satellite vibration isolators generally have the disadvantages of insufficient reliability and significant mass increase.

Contents of the invention

The purpose of the present invention is to solve the problems of insufficient reliability and heavy mass increase of the existing active-passive integrated whole star vibration isolator, and further provide a semi-active vibration isolation platform using magnetorheological damping technology.

The technical solution of the present invention is: the semi-active vibration isolation platform adopting the magneto-rheological damping technology is composed of a passive vibration isolation device, a semi-active control device and an anti-sway device, and the passive vibration isolation device includes an upper platform, a lower platform and at least three Elastic support rods, the upper platform and the lower platform are ring-shaped, at least three elastic support rods are installed between the upper platform and the lower platform, and the upper end and the lower end of each elastic support rod are respectively connected with the upper end of the upper platform. The lower end surface is fixedly connected to the upper end surface of the lower platform, and the middle part of each elastic support rod is bent into an outwardly convex arc shape; the semi-active control device is composed of a plurality of magneto-rheological dampers and a plurality of hinges Composition, the number of magnetorheological dampers is consistent with the number of elastic support rods, each magnetorheological damper is installed in the arc formed in the middle of the corresponding elastic support rod, and the upper end of each magnetorheological damper Both the head and the lower end are hinged with elastic support rods through hinges; the anti-sway device is composed of a first web, a second web, an upper sleeve and a lower sleeve, and the first web is installed on the inner wall of the upper platform On the top, the second radial plate is installed on the inner wall of the lower platform, the upper sleeve and the lower sleeve are fitted together, and the upper sleeve and the lower sleeve are in clearance fit, and the upper end surface of the upper sleeve is fixedly connected to the first radial plate, The lower end of the lower sleeve is fixedly connected to the second spoke plate.

Compared with the prior art, the present invention has the following beneficial effects: In order to reduce the axial stiffness of the vibration isolation platform, the present invention bends the middle of each elastic support rod into an arc shape, because the elastic support rod is bent with continuous material It has the function of a spring itself and does not need to add additional springs, so its internal stress changes continuously without sudden changes and has higher reliability; in addition, because the axial, lateral and torsional displacements allowed by the satellite are very small, this The inventive elastic support rod adopts a fixed connection form between the upper platform and the lower platform. Compared with the parallel mechanism with Hooke hinge and spherical hinge, this fixed connection form is not only simple to manufacture, but also can reduce hinges and other connecting parts. The number reduces the quality of the vibration isolation platform and improves the reliability. This fixed form also reduces the gap error when the hinge connection is used, and improves the vibration control accuracy; the magnetorheological damper of the present invention is based on the damping force The control force is provided in the form of MR damper, which can only provide the force opposite to the structural motion, that is, the control force that prevents the structural motion. It is for this reason that the control of the magneto-rheological damper has good stability. The magnetorheological damper and the The connection mode of the platform is simpler, it is only connected to the elastic support rod through the hinge, and there are fewer additional components, which reduces the quality of the vibration isolation platform and improves the reliability; the reliability of the present invention.

Description of drawings

Fig. 1 is an axonometric view of the overall structure of the passive vibration isolation device of the present invention, Fig. 2 is an axonometric view of the overall structure of the present invention, Fig. 3 is a front sectional view of the overall structure of the anti-sway device, and Fig. 4 is a sticking of a viscoelastic damping material layer The cross-sectional schematic diagram behind the outer surface of the elastic support rod, Fig. 5 is to adopt the present invention and not to adopt the random response curve control figure (wherein: dotted line --- to represent not to use the satellite of the present invention) of key points on the satellite of the present invention Random Response Curves for Keypoints, solid line - represents random response curves for keypoints on a satellite using the present invention).

Detailed ways

Specific embodiment one: (see Fig. 1～Fig. 3) the semi-active vibration isolation platform of this embodiment is made up of passive vibration isolation device, semi-active control device and anti-sway device 3, and described passive vibration isolation device comprises upper platform 1, The lower platform 6 and at least three elastic support rods 4, the upper platform 1 and the lower platform 6 are circular, at least three elastic support rods 4 are installed between the upper platform 1 and the lower platform 6, each elastic support The upper end and the lower end of the rod 4 are respectively affixed to the lower end surface of the upper platform 1 and the upper end surface of the lower platform 6, and the middle part of each elastic support rod 4 is bent into an outwardly convex arc shape; The semi-active control device consists of multiple magnetorheological dampers 8 and multiple hinges 7, the number of magnetorheological dampers 8 is consistent with the number of elastic support rods 4, and each magnetorheological damper 8 is installed on the corresponding In the circular arc formed by the middle part of the elastic support rod 4, and the upper end and the lower end of each magneto-rheological damper 8 are hinged with the elastic support rod 4 through the hinge 7; , the second web 5, the upper sleeve 10 and the lower sleeve 11, the first web 2 is installed on the inner wall of the upper platform 1, the second web 5 is installed on the inner wall of the lower platform 6, and the upper sleeve 10 is fitted with the lower sleeve 11, and the upper sleeve 10 and the lower sleeve 11 are in clearance fit, the upper end surface of the upper sleeve 10 is fixedly connected with the first spoke plate 2, and the lower end of the lower sleeve 11 is connected with the second The two spoke plates 5 are affixed.

Embodiment 2: (see FIG. 1 ) The number of elastic support rods 4 in this embodiment is three to six. With such a setting, the reliability is higher. Other compositions and connections are the same as in the first embodiment.

Embodiment 3: (see FIG. 1 ) The elastic support rod 4 of this embodiment is made of carbon fiber reinforced aluminum composite material. The tensile strength of the carbon fiber reinforced aluminum composite material is 665MPa, the density is 2400kg/m ³ , and the elastic modulus is 210GPa. Such setting better meets the requirements of high strength, light weight and low cost of the aerospace structure. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

Embodiment 4: (See FIG. 4 ) The passive vibration isolation device of this embodiment is also provided with a plurality of layers of viscoelastic damping material 9, and each layer of viscoelastic damping material 9 is pasted on the outer surface of the corresponding elastic support rod 4 . Such setting further improves the high-frequency and low-frequency vibration isolation capabilities of the passive vibration isolation device. Other compositions and connections are the same as those in the third embodiment.

Working process: The vibration-isolated satellite is placed on the upper platform 1, and the lower platform 6 is connected with the rocket. When the satellite is launched, the vibration load of the rocket acts on the lower platform 6 and is transmitted to the satellite through the entire vibration isolation platform, causing the satellite to vibrate in all directions. According to the vibration isolation theory, the elastic properties of the elastic support rod 4 of the vibration isolation platform can isolate high-frequency vibration loads. In the low-frequency vibration area, the vibration response of the satellite is relatively large, and the controller determines the current input to the magneto-rheological damper 8 according to the magnitude of the satellite response measured, so that the magnetorheological damper 8 produces the required damping force and suppresses the vibration of the satellite. the response to. The viscoelastic damping material layer 9 is pasted on the outer surface of the elastic support rod 4, which can further improve the high-frequency and low-frequency vibration isolation capabilities. In the frequency band of 0-200 Hz, the random response curve of key points on the satellite after adopting the vibration isolation platform of the present invention is obviously lower than that of the satellite without using the present invention (see FIG. 5 ).

Claims (4)

1. A semi-active vibration isolation platform using magnetorheological damping technology, which is composed of a passive vibration isolation device, a semi-active control device and an anti-sway device (3), characterized in that: the passive vibration isolation device includes an upper platform (1), lower platform (6) and at least three elastic support rods (4), described upper platform (1) and lower platform (6) are circular rings, described upper platform (1) and lower platform (6) ) between at least three elastic support rods (4), the upper end and the lower end of each elastic support rod (4) are respectively affixed to the lower end surface of the upper platform (1) and the upper end surface of the lower platform (6), The middle part of each elastic support rod (4) is bent into an outwardly convex arc; the semi-active control device is composed of a plurality of magneto-rheological dampers (8) and a plurality of hinges (7), The number of magnetorheological dampers (8) is consistent with the number of elastic support rods (4), and each magnetorheological damper (8) is installed in the arc formed in the middle of the corresponding elastic support rods (4), And the upper end and the lower end of each magneto-rheological damper (8) are hinged with the elastic support rod (4) through the hinge (7); Two webs (5), the upper sleeve (10) and the lower sleeve (11), the first web (2) is installed on the inner wall of the upper platform (1), and the second web (5) is installed On the inner wall of the lower platform (6), the upper sleeve (10) is fitted with the lower sleeve (11), and the upper sleeve (10) and the lower sleeve (11) are in clearance fit, and the upper sleeve (10) The upper end surface of the lower sleeve (11) is fixedly connected to the first spoke plate (2), and the lower end of the lower sleeve (11) is fixedly connected to the second spoke plate (5). 2. The semi-active vibration isolation platform using magnetorheological damping technology according to claim 1, characterized in that: the number of the elastic support rods (4) is three to six. 3. The semi-active vibration isolation platform using magnetorheological damping technology according to claim 1 or 2, characterized in that: the elastic support rod (4) is made of carbon fiber reinforced aluminum composite material. 4. The semi-active vibration isolation platform using magnetorheological damping technology according to claim 3, characterized in that: the passive vibration isolation device also includes a plurality of viscoelastic damping material layers (9), each viscoelastic damping material layer The layers (9) are pasted on the outer surfaces of the corresponding elastic support rods (4).

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