CN103359300A - Satellite in-orbit free boundary condition simulation device - Google Patents
Satellite in-orbit free boundary condition simulation device Download PDFInfo
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- CN103359300A CN103359300A CN2013103397386A CN201310339738A CN103359300A CN 103359300 A CN103359300 A CN 103359300A CN 2013103397386 A CN2013103397386 A CN 2013103397386A CN 201310339738 A CN201310339738 A CN 201310339738A CN 103359300 A CN103359300 A CN 103359300A
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Abstract
The invention discloses a satellite in-orbit free boundary condition simulation device. The satellite in-orbit free boundary condition simulation device mainly comprises a satellite butt joint plate, supporting springs, satellite balance adjusting devices, a limiting protecting device and a supporting plate, wherein the satellite butt joint plate at the upper portion of the device and the supporting plate at the lower portion of the device are correspondingly arranged according to the satellite mechanical structure and are generally of an annulus shape, the two ends of each supporting spring are fixedly connected to the annular portions between the satellite butt joint plate and the supporting plate respectively and evenly distributed around the annular portions so that a satellite can be elastically supported, the satellite balance adjusting devices which correspond to the supporting springs in number are fixedly arranged between the bottoms of the supporting springs and the supporting plate so that the supporting springs are supported to adjust inclination of the satellite and the simulation device caused by eccentricity of the satellite, and therefore the satellite is kept horizontal after being connected to the simulation device in a butt joint mode. According to the satellite in-orbit free boundary condition simulation device, the level of the satellite dynamics testing technique is improved, and requirements for verification of in-orbit dynamics characteristics and in-orbit micro-vibration environment tests in the process of developing satellites especially high-precision earth observation satellites are met.
Description
Technical field
The invention belongs to satellite dynamics testing technique field, be specifically related to a kind of satellite at the ground simulator of rail free boundary condition.
Background technology
Free boundary condition is spacecraft residing mechanical boundary conditions when orbital flight such as satellite, in the development process of the ground of the spacecrafts such as satellite, for obtaining the structural dynamic characteristics of satellite when rail flies, and high precision technology index and the reliability of verifying satellites when rail flight is executed the task, must carry out the dynamics tests such as modal test and little vibration test in the face of satellite on ground.When on ground in the face of satellite when testing, need the free boundary condition of analog satellite when rail flies, ideal situation is when supporting satellite weight, satellite is not applied any constrained force, namely make satellite be in free suspended state aloft, yet ground is the environment that gravity is arranged, this desirable free boundary condition can't realize on ground, needs to adopt approximate method to realize the simulation of satellite free boundary condition when rail flies.
External research and comparison morning to the free boundary condition analogy method, 20 century 70 US National Aeronautics and Space Administration (NASA) are when carrying out vibration-testing to unmanned aerial vehicle, utilize elastic string and crane that unmanned aerial vehicle is suspended in midair, free boundary condition when flying with simulated aircraft, yet elastic string has creep properties, can not use in test for a long time, the dynamics of crane has also affected simulate effect simultaneously.U.S. NASA Langley Research Center has carried out the research of nearly zero stiffness Suspension Technique and device in the 80-90 age in 20th century, nearly zero stiffness device is by combination and the prestrain of different springs, produce positive stiffness and negative stiffness, thereby obtain the simulation that zero stiffness is realized free boundary condition.Yet this device itself has nonlinear characteristic, only has the free boundary condition that just can obtain expecting when test article is in balance position, and it is relatively poor freely to simulate the condition simulation effect during away from equilibrium location.The nineties in 20th century, U.S. CSA engineering company has carried out the development of pneumatic/electromagnetic combination suspension gear, is used for the simulation of structure free boundary condition, and it is comprised of the parallel subsystem of two covers, i.e. passive pneumatic system and initiatively electromagnetic system.Passive pneumatic system supports the test specimen total weight by the piston-cylinder of the zerofriction force of particular design, initiatively subsystem produces the Tiny Mass that electromagnetic force comes the Active Compensation suspension gear to increase with a long stroke, non-contacting hot-wire coil, this device relates to pneumatic and calutron, and it is limited to consist of complexity and load-carrying capacity.
At home along with the develop rapidly of China's Aerospace Technology, the method and apparatus that is used for the free boundary condition simulation of space structure Surface power drive test is enriched constantly, the span is opened with suspension bracket, satellite Large deployable antenna suspension type free boundary analog machine such as satellite sun, simultaneously to U.S. CSA company pneumatic/electromagnetic type free boundary condition analog machine also carried out similar research.Generally speaking, compare with astropowers such as the U.S., still there is a certain distance in China aspect the research of satellite free boundary condition analogy method and device.Also do not possess at present the ripe particularly method and apparatus in the simulation of rail free boundary condition of the whole star of Large-scale satellite of satellite that is used for.
Therefore, in order to realize in the dynamics tests such as the little vibration of satellite ground and mode the simulation in the rail free boundary condition, must the corresponding device of development, solve satellite in the ground experiment demand of rail dynamics and the checking of little vibration environment.
Summary of the invention
In order to satisfy the technical need that exists in the prior art, the object of the present invention is to provide a kind of device in the free boundary condition of ground simulation satellite when rail flies, be used for the simulation of the test boundary condition of the dynamics tests such as the little vibration of satellite ground and mode.
The technical solution used in the present invention is as follows:
A kind of satellite is at rail free boundary condition analog machine, the satellites coupling plate that mainly comprises the top that is used to satellite to provide support interface, support spring, the satellite balance regulator, limiting and protecting device and the stay bearing plate that is used for providing the bottom of captiveing joint interface with ground and analog machine integral body being provided support, the satellites coupling plate of upper and lower and stay bearing plate are according to the setting of satellite machinery structural correspondence, be preferably annular arrangement or polygon, a plurality of support springs two ends are fixedly connected on respectively on the annular section between satellites coupling plate and the stay bearing plate and around annular section and evenly distribute, so that satellite is carried out resilient mounting; The quantity satellite balance regulator corresponding with support spring quantity is fixedly installed between support spring bottom and the stay bearing plate, with by the support of support spring being adjusted satellite that satellite off-centre causes and the inclination of analog machine, make satellites coupling maintenance level behind the analog machine; Limiting and protecting device is arranged on the annular section between satellites coupling plate and the stay bearing plate and to satellite by the circumference uniform distribution mode and carries out safety guard-safeguard; wherein; support spring is separately positioned between adjacent two limiting and protecting devices; the satellite balance regulator comprises the support screw thread; the height setting nut and the locking nut that on it support spring bottom are supported; locking nut is arranged on the adjacent base of height setting nut; studdle is the solid metal round bar; the outer wall of round bar is provided with screw thread; height setting nut and locking nut are respectively by regulating the height of support spring bottom with the screw thread fit of screw thread strut bar; studdle is captiveed joint with described stay bearing plate machinery; the studdle diameter does not contact with the spring intersection less than spring inside diameter.
Further, described limiting and protecting device comprises spacing pilot bar, spacing adjusting screw(rod), locking nut and the screw thread strut bar that connects successively, spacing pilot bar and screw thread strut bar are supported on respectively on the upper surface of the basal surface of satellites coupling plate and stay bearing plate, the screw thread strut bar is the solid metal round bar, its outer wall is provided with screw thread, spacing adjusting screw(rod) is hollow round bar, inside is provided with screw thread, be screwed on the screw thread strut bar, locking nut also is screwed on the screw thread strut bar and is arranged on spacing adjusting screw(rod) lower end and to be adjusted to the appropriate location it locked; Spacing pilot bar is bolted on the satellites coupling plate, and pilot bar points to the screw thread strut bar downwards, it is carried out cross spacing when spacing adjusting screw(rod) during to adjusted.
Further, the minimum number of described support spring is chosen 3, and suggestion is chosen for 4～8.Spring is arranged according to circumferentially arranging one every 45 °～120 ° at annulus.
Further, described satellites coupling plate adopts metallic material, and common is aluminum alloy or corrosion-resistant steel.
Further, described stay bearing plate adopts metallic material, and common is aluminum alloy or corrosion-resistant steel.
With prior art, the present invention sets up a kind of device in the free boundary condition of ground simulation satellite when rail flies, realize that satellite ground dynamics test Satellite is in the simulation of rail free boundary condition, improve satellite dynamics testing technique level, satisfy satellite and particularly verify demand at the rail dynamics with at the little vibration environment test of rail in the high precision earth observation satellite development process.
Description of drawings
Fig. 1 is that satellite of the present invention is at the structural representation of rail free boundary condition analog machine.
Wherein, 1 is the satellites coupling plate; 2 is support spring; 3 is the satellite balance regulator; 4 is limiting and protecting device; 5 is stay bearing plate.
Fig. 2 is the limiting and protecting device scheme drawing that satellite of the present invention uses in rail free boundary condition analog machine.
Wherein, 21 is the screw thread strut bar; 22 is spacing adjusting screw(rod); 23 is locking nut; 24 is spacing pilot bar.
Fig. 3 is the satellite balance regulator scheme drawing that satellite of the present invention uses in rail free boundary condition analog machine.
Wherein, 31 is studdle, and 32 is the height setting nut; 33 is locking nut.
The specific embodiment
Below satellite of the present invention is elaborated at rail free boundary condition analog machine, but should describe only exemplaryly, be not intended to protection scope of the present invention is carried out any restriction.
Fig. 1 is that satellite of the present invention is at the structural representation of rail free boundary condition analog machine.This analog machine mainly comprises the satellites coupling plate 1 on the top that is used to satellite to provide support interface, support spring 2, satellite balance regulator 3, limiting and protecting device 4 and the stay bearing plate 5 that is used for providing the bottom of captiveing joint interface with ground and analog machine integral body being provided support, the satellites coupling plate 1 of upper and lower and stay bearing plate 5 are according to the setting of satellite machinery structural correspondence, be preferably annular arrangement or polygon, a plurality of support springs 2 two ends are fixedly connected on respectively on the annular section between satellites coupling plate 1 and the stay bearing plate 5 and around annular section and evenly distribute, so that satellite is carried out resilient mounting; The quantity satellite balance regulator 3 corresponding with support spring quantity is fixedly installed between support spring 2 bottoms and the stay bearing plate 5, with by the support of support spring being adjusted satellite that satellite off-centre causes and the inclination of analog machine, make satellites coupling maintenance level behind the analog machine; Limiting and protecting device 4 is arranged on the annular section between satellites coupling plate and the stay bearing plate and to satellite by the circumference uniform distribution mode and carries out safety guard-safeguard; wherein; support spring 2 is separately positioned between adjacent two limiting and protecting devices 4; as shown in Figure 3; satellite balance regulator 3 comprises studdle 31; the height setting nut 32 that on it support spring 2 bottoms is supported and the first locking nut 33; the first locking nut 33 is arranged on the adjacent base of height setting nut 32; studdle 31 is the solid metal round bar; the outer wall of round bar is provided with screw thread; height setting nut 32 and the first locking nut 33 are respectively by regulating the height of support spring 2 bottoms with the screw thread fit of studdle 31; studdle 31 and described stay bearing plate 5 are mechanical captives joint; studdle 31 diameters do not contact with the spring intersection less than spring inside diameter.
In one embodiment, as shown in Figure 2, limiting and protecting device 4 comprises the spacing pilot bar 24 that connects successively, spacing adjusting screw(rod) 22, the second locking nut 23 and screw thread strut bar 21, spacing pilot bar 24 and screw thread strut bar 21 are supported on respectively on the upper surface of the basal surface of satellites coupling plate 1 and stay bearing plate 5, screw thread strut bar 21 is the solid metal round bar, its outer wall is provided with screw thread, spacing adjusting screw(rod) 22 is hollow round bar, inside is provided with screw thread, be screwed on the screw thread strut bar 21, the second locking nut 23 also is screwed on the screw thread strut bar 21 and is arranged on spacing adjusting screw(rod) 22 lower ends and to be adjusted to the appropriate location it locked; Spacing pilot bar 24 is bolted on the satellites coupling plate 1, and spacing pilot bar 24 points to screw thread strut bars 21 downwards, it is carried out cross spacing when spacing adjusting screw(rod) 22 during to adjusted.
In one embodiment, the minimum number of support spring is chosen 3.In another embodiment,, be chosen for 4～8.
In one embodiment, support spring is arranged according to circumferentially arranging one every 45 °～120 ° at annulus.
In one embodiment, the satellites coupling plate adopts metallic material, is preferably aluminum alloy or corrosion-resistant steel.
In one embodiment, stay bearing plate adopts metallic material, is preferably aluminum alloy or corrosion-resistant steel.
Specifically:
(1) satellites coupling plate
The Main Function of satellites coupling plate provides the interface of installing with satellites coupling, and abutting plate adopts tabular physical construction, and geometric configuration is consistent with satellite interface, and common is the annular arrangement plate, also can be polygon, adopts metallic material, and common is corrosion-resistant steel or aluminum alloy.The size of abutting plate is according to the satellites coupling Interface design, and the abutting plate internal diameter is less than the satellites coupling diameter, and the abutting plate external diameter is greater than the satellites coupling diameter.
(2) support spring
Support spring is the core component of analog machine, a plurality of springs with parallel way via satellite abutting plate satellite is carried out resilient mounting, after supporting satellite, the system that satellite and analog machine form has lower natural frequency, realizes that satellite is in the simulation of rail free boundary condition.Support spring can use the elastomeric elements such as mechanical coil spring or air bellow, and the explanation embodiment as an example of mechanical coil spring example is divided into five large steps:
The first step is chosen the spring number, and the satellites coupling plate is cirque structure, and according to circumferentially a spring being set every 45 °～120 ° at annulus, minimum 3 of spring number generally is chosen for 4～8.
Second step is determined the working load scope of single spring.Consider mechanical stability and the mechanical dimension of analog machine, it is 4～8 that spring number scope is chosen in suggestion.According to satellite weight, and consider the spring load safety factor, determine the working load scope of single spring by following formula:
The minimum working load of spring
The spring maximum working load
Wherein M is the satellite quality, and n is the spring number, and k is safety factor.
For example, satellite quality 2500kg, the spring number is 8, and safety factor is 2.0, and then spring working load scope is
f
Max=2.0 * f
Min=6000N.
In the 3rd step, determine the spring stiffness demand.The low frequency that satellite provides by spring in the simulation of rail free boundary condition supports and realizes, supporting frequency is determined by satellite mass characteristic and spring stiffness, satellite is subjects, and its mass property is fixed, and need choose suitable spring stiffness this moment and could realize the low frequency of satellite is supported.Spring stiffness determines that method divides two small steps:
1) the axial stiffness upper limit is determined.According to the structural dynamics principle, determine spring axial stiffness higher limit by following formula:
K in the formula
A_maxBe spring axial stiffness higher limit, f is for supporting frequency, and M is the satellite quality, and n is the spring number.
For example, support frequency 2Hz, satellite quality 2500kg, 8 of spring numbers, then spring shaft to rigidity requirement is
2) lateral stiffness and the bending stiffness upper limit are determined.Lateral stiffness and bending stiffness are difficult to adopt theoretical formula to be calculated, and adopt finite element analysis and optimization method to determine lateral stiffness and bending stiffness demand, and step is as follows:
I. use common finite element modeling software such as MSC.Patran, dummy satellite is set up in the service property (quality) unit, and gives this mass unit with quality and the rotor inertia value of satellite;
Ii. use common finite element modeling software such as MSC.Patran, use spring unit to set up spring model, and give spring unit with spring shaft to the hypothesis initial value of rigidity value, lateral stiffness and bending stiffness;
Iii. use common finite element modeling software such as MSC.Patran, an end of mass unit and spring unit is rigidly connected, the spring unit other end is applied fixed constraint, obtain finite element analysis model;
Iv. use common finite element modeling software such as MSC.Patran, lateral stiffness and bending stiffness that optimized variable is spring are set, optimization aim is set for supporting frequency, optimization target values is identical with support frequency in the axial stiffness determining step;
V. use common finite element Optimization Software such as MSC.Nastran, optimization calculates spring lateral stiffness higher limit and bending stiffness higher limit.
For example, satellite quality 2500kg, rotor inertia I
x=4700Nm
2, I
y=3300Nm
2, I
z=2600Nm
2, lateral stiffness hypothesis initial value 40000, bending stiffness hypothesis initial value 1000, optimization aim supports frequency 2Hz, and by setting up finite element model and optimizing and calculate, obtaining the lateral stiffness higher limit is 24000N/m, and the bending stiffness higher limit is 1000Nm/rad.
The 4th step, the preliminary type selecting of spring.Utilize the spring maximum working load of determining in the second step, press the spring design General Requirements: 0.2 times of spring test load≤spring maximum working load≤0.8 times spring test load, calculate the spring test load:
According to GB GB/T2089-1994(cylindroid helical-coil compression spring size and parameter) in the test load value of the standard spring that provides, tentatively select qualified spring.
In the 5th step, Spring Selection is confirmed.The Spring Selection affirmation is screened the spring of tentatively choosing and is confirmed, method is by the lateral stiffness of the stability of Calculation Verification spring, spring and spring bending rigidity, when above-mentioned three Verifications all meet, confirm Spring Selection, the implementation step is as follows:
I. the stable Calculation Verification of spring.
Spring stiffness demand according to the individual pen rigidity of the spring of preliminary type selecting and the 3rd step are determined is calculated as follows the active spring coils number:
Formula medi-spring individual pen rigidity provides at GB GB/T2089-1994.
Calculate spring free length according to spring pitch and the number of turns:
L=P×n
1+d
L is spring free length in the formula, n
1Be total coil number of spring (being number of active coils and support number of turns sum) that d is the spring wire diameter.
Carry out according to the following equation the spring Stability Checking
D is the central diameter of selected spring in the formula, b
0Be the stability requirement value, to device of the present invention, the spring state is that an end is fixed end revolution, at this moment b
0=3.7, when above-mentioned formula satisfied, the spring stability requirement was satisfied.
Ii. the lateral stiffness of spring estimation checking
Press following formula estimation spring lateral stiffness
F wherein
AxiallyBe the spring axial load,
Be the spring equivalent bending stiffness,
Be the spring Effective Shear Stiffness, E is the modulus of elasticity of spring material, and d is bar diameter of spring, and μ is the Poisson's ratio of spring material.
Work as K
qWhen going on foot lateral stiffness upper limit required value less than the 3rd, meet the demands.
Iii. the bending stiffness of spring estimation checking
Be calculated as follows spring bending rigidity
Wherein M is the suffered moment of flexure of spring one end, and γ is the spring end corner, and its dependent variable meaning is identical with spring lateral stiffness estimation equation.
Work as K
bDuring less than third order bends rigidity upper limit required value, meet the demands.
Iv. Spring Selection is confirmed
Check spring stability, spring lateral stiffness, spring bending rigidity, when the three met the demands simultaneously, selected spring model was final model.
(3) satellite balance regulator
When centroid of satellite was eccentric, a side spring stress of analog machine was large, and the opposite side spring stress is little, and stressed large deflection of spring is large, and stressed little deflection of spring is little, causes satellite to be in heeling condition.The satellite balance regulator is regulated the spring high and low position for this state, makes satellite be in horizontality.
Embodiment is: balance regulator is comprised of three parts, respectively screw thread strut bar, height setting nut and locking nut, the screw thread strut bar is the solid metal round bar, outer wall is provided with screw thread, be bolted to connection on the stay bearing plate of analog machine, height setting nut and spring lower end plane contact, locking nut is in the middle of height setting nut and screw thread strut bar (referring to Fig. 3).Screw thread strut bar diameter does not contact with the spring intersection less than spring inside diameter, does not introduce friction force.
Spring during to adjusted, is directly upwards revolved the height setting nut, then locking nut is also upwards revolved, contact with the height setting nut, provide larger screw thread friction force with self-locking, prevent from moving down bottom the spring.
When spring is regulated downwards, first with locking nut to backspin, then will the height setting nut to backspin, contact with locking nut, provide larger screw thread friction force with self-locking by locking nut, prevent from moving down bottom the spring.
Above-mentioned embodiment is the most basic method, can use jack that above-mentioned screw thread strut bar, height setting nut and locking nut are substituted, and realizes same function.
(4) limiting and protecting device
If the chance failure that support spring lost efficacy occurs in the use procedure of satellite free boundary analog machine, satellite will drop into ground and cause damage, and limiting and protecting device is set for this reason, prevent that satellite from damaging.
Embodiment is: limiting and protecting device comprises four parts, is respectively the screw thread strut bar, spacing adjusting screw(rod), locking nut and spacing pilot bar.The screw thread strut bar is the solid metal round bar, and outer wall is provided with screw thread, along being evenly arranged on the stay bearing plate circumference, is bolted to connection on the stay bearing plate of analog machine; The screw thread strut bar is hollow round bar, and inside is provided with screw thread, is screwed on the screw thread strut bar; Locking nut also is screwed on the screw thread strut bar, in spacing adjusting screw(rod) lower end; Spacing pilot bar is bolted on the satellites coupling plate, and pilot bar points to the screw thread strut bar downwards, when spacing adjusting screw(rod) carries out cross spacing (referring to Fig. 2) to it during to adjusted.
During use, when satellite when support spring is in the static balance state, spacing adjusting screw(rod) disengages the interface with satellite to backspin, but is no more than spacing pilot bar lower end, and satellite is carried out position limitation protection.
Above-mentioned embodiment is the most basic method, can use jack with above-mentioned screw thread strut bar, spacing adjusting screw(rod), and locking nut substitutes, and realizes same function.
(5) stay bearing plate
The Main Function of stay bearing plate provides the fixing interface in analog machine and ground, and satellite balance regulator fixed interface is provided, and the limiting and protecting device interface is provided, and adopts tabular physical construction, adopts metallic material, and common is corrosion-resistant steel or aluminum alloy.
Although above the specific embodiment of the present invention has been given to describe in detail and explanation; but what should indicate is; we can carry out various equivalences to above-mentioned embodiment according to conception of the present invention and change and modification; when its function that produces does not exceed spiritual that specification sheets and accompanying drawing contain yet, all should be within protection scope of the present invention.
Claims (9)
1. a satellite is at rail free boundary condition analog machine, the satellites coupling plate that mainly comprises the top that is used to satellite to provide support interface, support spring, the satellite balance regulator, limiting and protecting device and the stay bearing plate that is used for providing the bottom of captiveing joint interface with ground and analog machine integral body being provided support, the satellites coupling plate of upper and lower and stay bearing plate are according to the setting of satellite machinery structural correspondence, be preferably annular arrangement or polygon, a plurality of support springs two ends are fixedly connected on respectively on the annular section between satellites coupling plate and the stay bearing plate and around annular section and evenly distribute, so that satellite is carried out resilient mounting; The quantity satellite balance regulator corresponding with support spring quantity is fixedly installed between support spring bottom and the stay bearing plate, with by the support of support spring being adjusted satellite that satellite off-centre causes and the inclination of analog machine, make satellites coupling maintenance level behind the analog machine; Limiting and protecting device is arranged on the annular section between satellites coupling plate and the stay bearing plate and to satellite by the circumference uniform distribution mode and carries out safety guard-safeguard; wherein; support spring is separately positioned between adjacent two limiting and protecting devices; the satellite balance regulator comprises the support screw thread; the height setting nut and the locking nut that on it support spring bottom are supported; locking nut is arranged on the adjacent base of height setting nut; studdle is the solid metal round bar; the outer wall of round bar is provided with screw thread; height setting nut and locking nut are respectively by regulating the height of support spring bottom with the screw thread fit of screw thread strut bar; studdle is captiveed joint with described stay bearing plate machinery; the studdle diameter does not contact with the spring intersection less than spring inside diameter.
2. analog machine as claimed in claim 1, wherein, described limiting and protecting device comprises the spacing pilot bar that connects successively, spacing adjusting screw(rod), locking nut and screw thread strut bar, spacing pilot bar and screw thread strut bar are supported on respectively on the upper surface of the basal surface of satellites coupling plate and stay bearing plate, the screw thread strut bar is the solid metal round bar, its outer wall is provided with screw thread, spacing adjusting screw(rod) is hollow round bar, inside is provided with screw thread, be screwed on the screw thread strut bar, locking nut also is screwed on the screw thread strut bar and is arranged on spacing adjusting screw(rod) lower end and to be adjusted to the appropriate location it locked; Spacing pilot bar is bolted on the satellites coupling plate, and pilot bar points to the screw thread strut bar downwards, it is carried out cross spacing when spacing adjusting screw(rod) during to adjusted.
3. analog machine as claimed in claim 1 or 2, wherein, the minimum number of support spring is 3.
4. analog machine as claimed in claim 3, wherein, the quantity of support spring is 4-8.
5. analog machine as claimed in claim 3, wherein, spring is arranged according to circumferentially arranging one every 45 °～120 ° at annulus.
6. analog machine as claimed in claim 1 or 2, wherein, described satellites coupling plate adopts metallic material.
7. analog machine as claimed in claim 6, wherein, described metallic material is corrosion-resistant steel or aluminum alloy.
8. analog machine as claimed in claim 1 or 2, wherein, described stay bearing plate adopts metallic material.
9. analog machine as claimed in claim 8, wherein, described metallic material is corrosion-resistant steel or aluminum alloy.
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