CN203585195U - Vibration isolator for inhibiting micro-vibration of in-orbit CMG - Google Patents

Abstract

The utility model provides a vibration isolator for inhibiting the micro-vibration of an in-orbit CMG (Control Moment Gyro). The vibration isolator comprises an adapting plate, a bushing, rubber pads and a washer, wherein the adapting plate is connected with the CMG, and the bushing is used for providing the rubber pads with mounting support; the rubber pads are divided into an upper layer and a lower layer, and a structure which is sandwiched by the upper layer and the lower layer is connected with the CMG. The material of the rubber pads meets the conditions that the tensile strength is 8.5-9.5 MPa, the breaking elongation rate is larger than or equal to four hundred percents, the breaking permanent deformation is smaller than or equal to twenty percents, the shore hardness is 45-55, the shear modulus is 1.5-2.5 MPa, and the loss factor is 0.25. The vibration isolator has the advantages that the weight is light; through the reasonable selection of the material of the rubber pads, good rigidity and damping properties and stable performance are ensured, and meanwhile, the vibration isolating requirement on the in-orbit CMG is met; the design is simple, and the reliability is high; the vibration isolator not only can bear the load of a launching section, but also can realize an in-orbit vibration isolating function; active thermal control is not required.

Description

A kind of for the vibration isolator of the micro-vibration suppression of CMG in-orbit

Technical field

The utility model belongs to vibration isolator field, relates in particular to a kind of for the vibration isolator of the micro-vibration suppression of CMG in-orbit.

Background technique

Along with the performance index such as remote sensing satellite resolution improve, micro-vibration affects on image quality the key issue that problem has gradually become the performance boost of restriction remote sensing satellite.Certain model passing of satelline ground experiment and simulation analysis find that micro-vibration that on star, the normal work of control-moment gyro (CMG) produces is larger, maximum perturbation power reaches 40N, cause the camera optical axis to rock and reach 0.1 rad, higher than the index of 0.0665 rad of camera proposition, have influence on the image quality of camera.China does not also implement the precedent of micro-vibration vibration isolation in-orbit at present, therefore need to design a kind of vibration isolator that carries out micro-vibration suppression for CMG.

Model utility content

For solving the problems of the technologies described above, the utility model provides that a kind of this vibration isolator is lightweight for the vibration isolator of the micro-vibration suppression of CMG in-orbit, and by choose reasonable rubber pad material, there is good stiffness characteristics and damping characteristic, stable performance has solved the demand of CMG vibration isolation in-orbit, simplicity of design simultaneously, reliability is high, can bear transmitter section load, can play in-orbit vibration isolation effect again, not need Active thermal control.

Should comprise for the vibration isolator of the micro-vibration suppression of CMG in-orbit:

Pinboard, lining, rubber cushion and pad;

Described pinboard, is connected with CMG;

Described lining is used to described rubber cushion to provide support is installed;

Described rubber cushion is divided into two-layer up and down, and described upper and lower two-layer clipped structure is connected with CMG;

Described pad, is pressed in above described rubber cushion, and the decrement of described rubber cushion is controlled within the scope of 0.2-0.5mm;

Further, the material of described rubber cushion meets: tensile strength between 8.5-9.5Mpa, elongation at break is more than or equal to 400 percent, setafter break is less than or equal to 20 percent, shore hardness between 45-55, shear modulus between 1.5-2.5Mpa, fissipation factor is 0.25.

The beneficial effects of the utility model are:

(1) the utility model has solved the demand of CMG vibration isolation in-orbit, simplicity of design, and reliability is high, can bear transmitter section load, can play in-orbit vibration isolation effect again, does not need Active thermal control.

(2) the utility model very light in weight, only has 535g, meets product weight requirement on star, compares the weight more than general 1kg of conventional vibration isolation way, reduces approximately 50%.

(3) the utility model, by choose reasonable rubber pad material, has good stiffness characteristics and damping characteristic, and stable performance.

Accompanying drawing explanation

Fig. 1 is the vibration isolator structure schematic diagram for the micro-vibration suppression of CMG in-orbit of the present utility model;

Fig. 2 is the rubber cushion size schematic diagram of the vibration isolator for the micro-vibration suppression of CMG in-orbit of the present utility model;

Fig. 3 is the work schematic diagram of the vibration isolator for the micro-vibration suppression of CMG in-orbit of the present utility model.

Embodiment

Fig. 1 is the vibration isolator structure schematic diagram for the micro-vibration suppression of CMG in-orbit of the present utility model.As shown in Figure 1, the vibration isolator for the micro-vibration suppression of CMG in-orbit of the present utility model comprises:

Pinboard 1, lining 2, rubber cushion 3 and pad 4;

Described pinboard 1, is connected with CMG, is connected specifically with the fondational structure of CMG, needs exactly to reduce the place of transmitting disturbance in the past.

Described lining 2 is used to described rubber cushion to provide support is installed.

Described rubber cushion 3 is divided into two-layer up and down, and described upper and lower two-layer clipped structure is connected with CMG, and the disturbance that CMG produces is through the vibration damping of middle rubber cushion, and the disturbance energy that is delivered to 1 pinboard in figure reduces greatly.

Described pad 4, is pressed in above described rubber cushion, and the decrement of described rubber cushion is controlled within the scope of 0.2-0.5mm;

Further, the material of described rubber cushion meets: tensile strength between 8.5-9.5Mpa, elongation at break is more than or equal to 400 percent, setafter break is less than or equal to 20 percent, shore hardness between 45-55, shear modulus between 1.5-2.5Mpa, fissipation factor is 0.25.

Pinboard is for being connected by screw with CMG, and lining is for providing the installation of rubber cushion to support, and rubber cushion divides two-layer up and down, by crossing matching design, is closely connected with fondational structure.By crossing matching design, pad is tightly pressed in above rubber cushion, decrement is controlled at 0.2～0.5mm, to guarantee that rubber cushion is in compressive state.

The realization of vibration isolator Key Performance Indicator is in the selection with rubber cushion material and size design.The basic parameter of rubber cushion material is as follows:

Rubber cushion rigidity and damping are also closely related with rubber cushion size, by optimal design, can obtain the specific design parameter of rubber cushion size.Lateral stiffness is main relevant with rubber cushion transverse gage, and longitudinal rigidity is main relevant with rubber cushion longitudinal thickness.As shown in Figure 2, large external diameter is 22.2mm to the concrete size of rubber cushion, and little external diameter is 18.2mm, and big or small internal diameter communicates and is 12.7mm, and the cylinder height at large external diameter place is 8.6mm, and the cylinder height at little external diameter place is 3.7mm.Fig. 2 is the rubber cushion size schematic diagram of the vibration isolator for the micro-vibration suppression of CMG in-orbit of the present utility model.

This device should be able to meet following performance index and require:

(1) micro-vibration subtracts device for vibration insutation and can not require the power supply of whole star and thermal control is provided;

(2) micro-vibration subtracts device for vibration insutation and must be able to bear the various environmental effects that transmitter section satellite bears;

(3) micro-vibration subtracts in the various mechanical environments in-orbit of device for vibration insutation in must be able to bearing during satellite operation on orbit and other space environment effect situations and normally works;

(4) micro-vibration subtract device for vibration insutation in-orbit normal work period must be able to reduce momenttum wheel and CMG and normally work and produce, be delivered to the disturbance energy of bearing cylinder;

(5) micro-vibration subtract device for vibration insutation in-orbit normal work period meet the pointing accuracy requirement of momenttum wheel and CMG.

(6) effectively vibration isolation, the amplitude root-mean-square value (RMS) that is delivered to bearing cylinder is reduced by least 20dB;

(7) micro-vibration subtracts fundamental frequency under the clamped boundary conditions of device for vibration insutation and is not less than 14Hz, and can not with other frequency couple on star;

(8) micro-vibration subtracts device for vibration insutation self resonance peak place damping ratios and is not less than 0.25.

When equipment and CMG assembling:

(1) pinboard is contained to boss face down, keep flat; According to R hole sign, adjust vibration isolator, 9 mounting holes on vibration isolator are alignd with 9 tapped holes on mounting bracket.

(2) 9 M8 screws are installed successively, during mounting screw, screw are not screwed.Do like this and can guarantee, when residue screw is installed, can continue to finely tune vibration isolator, make 9 mounting holes and the screw hole can both complete matching, avoid indivedual screws to be subject to shearing force.

(3) after 9 screws are all in place, finally with torque-indicating wrencg by screw-driving, screw-down torque is 20Nm～21Nm.

(4) CMG is placed on pinboard; According to R hole sign, adjust CMG, 12 mounting holes are alignd with 12 tapped holes on vibration isolator.

(5) 12 M6 screws are installed successively, during mounting screw, screw are not screwed.Do like this and can guarantee, when residue screw is installed, can continue to finely tune CMG, make 12 mounting holes and the screw hole can both complete matching, avoid indivedual screws to be subject to shearing force.

(6), after 12 screws are all in place, with torque-indicating wrencg, by screw-driving, screw-down torque is 7.5N*m～8N*m.

(7) vibration isolator installation.

After having assembled, the assembly parts of CMG and vibration isolator can be arranged on to equipment mounting point, by screw-driving, get final product work.As shown in Figure 3, Fig. 3 is the work schematic diagram of the vibration isolator for the micro-vibration suppression of CMG in-orbit of the present utility model.

Certainly; the utility model also can have other various embodiments; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.

Claims (1)

1. for a vibration isolator for the micro-vibration suppression of CMG in-orbit, it is characterized in that, this vibration isolator comprises:

Pinboard, lining, rubber cushion and pad;

Described pinboard, is connected with CMG;

Described lining is used to described rubber cushion to provide support is installed;

Described rubber cushion is divided into two-layer up and down, and described upper and lower two-layer clipped structure is connected with CMG;

Described pad, is pressed in above described rubber cushion, and the decrement of described rubber cushion is controlled within the scope of 0.2-0.5mm;

Further, the material of described rubber cushion meets: tensile strength between 8.5-9.5Mpa, elongation at break is more than or equal to 400 percent, setafter break is less than or equal to 20 percent, shore hardness between 45-55, shear modulus between 1.5-2.5Mpa, fissipation factor is 0.25.

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