CN110046413A - A kind of dynamic analysis method for lead screw guide rails formula space focusing platform - Google Patents
A kind of dynamic analysis method for lead screw guide rails formula space focusing platform Download PDFInfo
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- CN110046413A CN110046413A CN201910266141.0A CN201910266141A CN110046413A CN 110046413 A CN110046413 A CN 110046413A CN 201910266141 A CN201910266141 A CN 201910266141A CN 110046413 A CN110046413 A CN 110046413A
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- guiding rail
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- 238000005096 rolling process Methods 0.000 claims description 13
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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Abstract
The invention belongs to optical engineering and Mechanical Structure Analysis fields, it is related to a kind of dynamic analysis method for lead screw guide rails formula space focusing platform, the modeling to focusing platform and guiding rail joint portion is completed including the use of finite element method and the serial spring damping unit of optimization, moving component different in focusing platform is considered as independent elastic system, relationship based on each elastic system, the kinetic parameter of different motion component is equivalent on guiding rail joint portion, and the kinetic parameter of guide rail is obtained in conjunction with the analytic formula based on Elastic Contact Theory, the final finite element dynamic analysis for realizing focusing platform.The analysis method enormously simplifies analysis difficulty, the modeling method of the guiding rail joint portion of optimization can stiffness characteristics to guide rail ball and mass property carry out Equivalent Modeling, further improve global analysis precision and accuracy.The analysis method is enabled more can preferably to complete the Dynamical Characteristics of space focusing platform.
Description
Technical field
The invention belongs to optical engineering and Mechanical Structure Analysis field, it is related to having for lead screw guide rails formula focusing platform
Finite element analysis and dynamics model analysis.
Background technique
Space optical camera is widely applied with the development of current science and technology in military and civilian field.Its work
It is to obtain and provide the image of complete display as task, the target area of shooting must be accurately imaged on CCD photosurface.It adjusts
Focusing mechanism can compensate for causing in camera optical system because of various complex effects as the important component for guaranteeing camera imaging quality
Focal plane caused by the variation of parameter deviates.And lead screw guide rails formula focus adjusting mechanism is as the focus adjusting mechanism form being most widely used,
It is in the camera almost unique moving component.Therefore, the research of its kinetic characteristics is particularly important, but simultaneously because
The mechanism kinematic variety of components is more, and mechanical environment is complicated, so that the dynamic analysis of focusing platform has certain difficulty.
Chief component of the lead screw guide rails formula focusing platform as space focus adjusting mechanism.Its structure includes focusing platform bottom
Seat, motor and deceleration mechanism, transmission mechanism, guiding mechanism and workbench.The transmission mechanism is ball-screw, the guiding
Mechanism is rolling guide, and when work, the input signal after deceleration is passed to ball-screw by shaft coupling by platform, utilizes lead screw
Translation is converted by rotation, rolling guide realizes accurate focusing as guiding mechanism carrying focal plane subassembly designated displacement.This system
With very high contact nonlinear feature.Therefore, the characteristics of mode for grasping such focusing platform is particularly important.It can
Guarantee that there is focal plane load loose mechanics to input, and reliability and stability with higher, while being control focusing essence
Degree provides important evidence.
More perfect research achievement existing for the dynamic analysis of single movement component at present, but it is directed to space camera
The dynamic analysis of focusing platform is more rare.And for such focusing platform, operating condition is complex, physical environment compared with
It is changeable.To dynamic (dynamical) modeling, more stringent requirements are proposed with analysis for this.
Summary of the invention
The object of the present invention is to provide a kind of dynamic analysis sides for lead screw guide rails formula space camera focusing platform
Method.
To achieve the above object, it needs to consider following problems: how the focusing platform comprising multi-motion component be modeled；
How to be suitable for space application small parts movable joint Dynamic Modeling；And how to grasp more in focusing platform
The kinetic parameter and its relationship of component.This directly determines the accuracy and correctness of space focusing platform dynamic analysis.
Technical solution of the invention is as follows:
A kind of dynamic analysis method for lead screw guide rails formula space focusing platform, comprising the following steps:
S1, the finite element model for establishing focusing platform；
The output end of motor and deceleration mechanism in lead screw guide rails formula focusing platform is changed to fixing end, above-mentioned fixing end is solid
It is scheduled on focusing platform pedestal, and is connected with shaft coupling；Lead screw guide rails formula focusing platform can pass herein for any feed screw nut
Dynamic image planes movable type focusing platform；This kind of focusing platform include substantially construction pedestals, motor and deceleration mechanism, transmission mechanism,
Guiding mechanism and this several part of mobile platform.
S2, the kinetic model for establishing guiding rail joint portion；Movement between guiding rail joint portion, that is, guide rail sliding block and guide rail
Engaging portion, i.e. rolling body portion.
Each ball in guiding rail joint portion is modeled using spring-damping element；
S3, the Elastic System Model for establishing focusing platform；
Elastic system is independent by moving component each in focusing platform is equivalent；
S4, the kinetic parameter for obtaining guiding rail joint portion；
S41, the rigidity of guiding rail joint portion in the movement direction is obtained；
According to the Elastic System Model of the step S3 focusing platform established, each elastic system is obtained in conjunction with Elastic Contact Theory
Rigidity；Based on the connection relationship of each elastic system, by the stiffnes s equivalent of different motion component to guiding rail joint portion in movement side
Upward rigidity；
S42, rigidity of the guiding rail joint portion in the non-guide rail direction of motion is obtained；
According to the kinetic model that step S2 is established, exist in conjunction with the analytic formula acquisition guiding rail joint portion of Elastic Contact Theory
Rigidity in the non-guide rail direction of motion；
S5, Dynamics Simulation Analysis is carried out to finite element model；
The step S4 kinetic parameter got is brought into the finite element model of step S1 foundation, passes through finite element software
The dynamic analysis of focusing platform can be realized.
Further, for typical lead screw guide rails formula space focusing platform, the finite element mould of the focusing platform in step S1
Type includes focusing platform pedestal, the fixing end on focusing platform pedestal, shaft coupling, ball-screw, rolling guide and work
Platform；
In above-mentioned fixing end and the fixed focusing platform pedestal of rolling guide；
Above-mentioned shaft coupling and fixing end are connected；
Above-mentioned ball-screw one end and shaft coupling are connected, and the other end is connected by feed screw nut and workbench；
Above-mentioned workbench is arranged on rolling guide by guide rail slide block.
It is of course also possible to other focusing platforms are directed to, as long as that is, described above will be in lead screw guide rails formula focusing platform
Motor and the output end of deceleration mechanism are changed to fixing end, and above-mentioned fixing end is fixed on focusing platform pedestal, and solid with shaft coupling
Even.
Further, in step S2, above-mentioned spring-damping element includes three pairs of Bar units (beam element) and a Point
Unit (dot element)；
Two Bar connect to form a pair of of Bar unit
In global coordinate system, each guide rail ball is respectively carried out using a pair of Bar unit on three translational degree of freedom etc.
Effect, three pairs of same series connection nodes of Bar units shared；
Point unit is located on the series connection node；
Global coordinate system is rectangular coordinate system in space, and three axis directions are respectively the guide rail slide block direction of motion, horizontal vertical in
The direction of guide rail slide block movement, and the direction perpendicular to focusing platform pedestal.
Further, above-mentioned Bar unit is the Bar unit for assigning 1D Spring attribute；
Above-mentioned Point unit is (ground connection qualitative attribute) the Point unit for assigning 0D Ground Mass attribute.
The present invention has the advantages that
1, modeling method of the invention carries out Dynamic Modeling just for guiding rail joint portion, this is for more difference portion
The modeling difficulty and complexity of kinetic model are enormously simplified for the focusing platform of part.
2, since motor is off operating to focus adjusting mechanism during imaging, and mechanism of slowing down is with reverse self-locking.It examines
Consider goal in research and working condition, the output end for mechanism of slowing down is changed to fixing end by the modeling of focusing platform of the present invention, isolation
The influence of reduction gearbox and motor, simplifies finite element model.
3, the guiding rail joint portion kinetic model that the present invention establishes not only is hindered using elasticity of the Bar unit to guide rail ball
Damping characteristics carry out Equivalent Modeling, also add quality of the Point unit to Equivalent Modeling guide rail ball, considerably increase model
Accuracy and precision.
4, the present invention has unified kinetic parameter on guiding rail joint portion for the system stiffnesses of different components is equivalent, convenient
Model analysis, and realize the purpose of challenge simplification.
5, present invention modeling has preferable universality with analysis method, and the modeling can be used for such focus adjusting mechanism
With analysis method.
6, the present invention has higher reliability and precision, the fundamental frequency result of the dynamics model analysis obtained through the invention
It is no more than 3.7% with the error maximum of experimental result.
Detailed description of the invention
Fig. 1 is flow chart of the present invention for the dynamic analysis method of lead screw guide rails formula space focusing platform；
Fig. 2 is the structural schematic diagram of the typical lead screw guide rails formula of certain in embodiment space focusing platform finite element model；
Fig. 3 is the modeling schematic diagram of embodiment guiding rail joint portion；
Appended drawing reference in figure are as follows: 1- focusing platform pedestal, 2- fixing end, 3- shaft coupling, 4- ball-screw, 5- rolling are led
Rail, 6- workbench, 7- feed screw nut, 8- guide rail slide block；
11-Bar cell node, 12-X translational degree of freedom Bar unit, 13-Y translational degree of freedom Bar unit, 14-Z translation is certainly
By spending Bar unit, 15-Point unit, 16- series connection node.
Specific embodiment
In order to clearly illustrate technical characterstic of the invention, below by specific embodiment and its attached drawing is combined, it is right
The present invention is described in detail.It should be noted that component shown in the drawings is not drawn necessarily to scale.Present invention omits
It is of the invention to avoid unnecessary limitation to the description of known assemblies and well-known technique.
A kind of dynamics for lead screw guide rails formula space focusing platform that the present embodiment is proposed with reference to the accompanying drawing
Analysis method is described in detail.
As shown in Figure 1, the present embodiment is directed to the dynamic analysis method of lead screw guide rails formula space focusing platform, by following
Step is realized:
(1) finite element model of focusing platform is established；
Application of the invention is lead screw guide rails formula space focusing platform, since motor is focus adjusting mechanism during imaging
It shuts down, and mechanism of slowing down is with reverse self-locking characteristic.It is contemplated that goal in research and working condition are arrived, by speed reducer
The output end of structure is changed to fixing end, closed coupling.Lead screw guide rails formula focusing platform can be any screw nut driven herein
Image planes movable type focusing platform；This kind of focusing platform includes construction pedestals, motor and deceleration mechanism, transmission mechanism, leads substantially
To mechanism and this several part of mobile platform.For its simplified pinciple of typical focusing platform as shown in Fig. 2, including focusing platform
Pedestal 1, fixing end 2, shaft coupling 3, ball-screw 4, rolling guide 5 and workbench 6；Fixing end 2 and the fixed tune of rolling guide 5
On burnt platform base 1；Shaft coupling 3 and fixing end 2 are connected；4 one end of ball-screw and shaft coupling 3 are connected, and the other end passes through lead screw
Nut 7 and workbench 6 are connected；Workbench 6 is arranged on rolling guide 5 by guide rail slide block 8.
(2) kinetic model of guiding rail joint portion is established；
The modeling of guiding rail joint portion largely affects the accuracy of overall model.It is multiple in aerospace field
Miscellaneous changeable environment influences it from ignoring guide rail ball quality bring.The present invention is using the spring-damping element pair optimized
Each ball is modeled in guiding rail joint portion, and the spring-damping element of every group of optimization includes three pairs of Bar units and a Point
Unit.Two Bar connect to form a pair of of Bar unit, and wherein Bar unit assigns 1D Spring attribute, and Point unit assigns 0D
Ground Mass attribute, so can elastic damping characteristic to ball and mass property carry out Equivalent Modeling.And three pairs
The same series connection node 16 of Bar units shared, in global coordinate system, each guide rail ball is respectively adopted on three translational degree of freedom
Carried out with the Bar unit of a pair of series it is equivalent, in Fig. 3, X translational degree of freedom spring unit 12, Y translational degree of freedom spring unit
13, Z translational degree of freedom spring units 14, Point unit 15 are located on the series connection node.Each ball is all made of one group of optimization
Spring-damping element carries out Equivalent Modeling, and modeling principle is as shown in Figure 3.
(3) Elastic System Model of focusing platform is established；
The foundation of focusing platform elastic system is to be independent elastic system, elastic system for different moving components is equivalent
Number and connection type it is different according to the difference of design.
(4) kinetic parameter of guiding rail joint portion is obtained；
Based on the relationship of step (3) each elastic system, the stiffnes s equivalent of different motion component to guiding rail joint portion is being transported
Rigidity on dynamic direction, to simplify the analysis difficulty of focusing platform.According to the kinetic model that step (2) are established, guide rail is combined
Rigidity of the portion on non-athletic direction is obtained by guideway based on the analytic formula of Elastic Contact Theory.The calculating of the step
The Cheng Junwei prior art, is not described in detail herein.
(5) Dynamics Simulation Analysis is carried out to finite element model.
The kinetic parameter that will acquire, which is brought into the finite element model that step (1) is established, realizes the dynamic of focusing platform
Mechanical analysis.
The method of the present invention is verified by following experiments:
The analysis method carries out dynamics model analysis to certain model focusing platform through the invention first, is somebody's turn to do
The emulation data of the mode fundamental frequency of focusing platform.Then, the experiment of low amounts grade sine sweep is carried out to the focusing platform, obtains mode
The experimental data of fundamental frequency.Last contrast simulation data and experimental data.By many experiments it is found that the mould obtained through the invention
The simulation result of state fundamental frequency and the error maximum of experimental result are no more than 3.7%.
Claims (4)
1. a kind of dynamic analysis method for lead screw guide rails formula space focusing platform, which comprises the following steps:
S1, the finite element model for establishing focusing platform；
The output end of motor and deceleration mechanism in lead screw guide rails formula focusing platform is changed to fixing end, the fixing end is fixed on
On focusing platform pedestal, and it is connected with shaft coupling；
S2, the kinetic model for establishing guiding rail joint portion；
Each ball in guiding rail joint portion is modeled using spring-damping element；
S3, the Elastic System Model for establishing focusing platform；
Elastic system is independent by moving component each in focusing platform is equivalent；
S4, the kinetic parameter for obtaining guiding rail joint portion；
S41, the rigidity of guiding rail joint portion in the movement direction is obtained；
According to the Elastic System Model of the step S3 focusing platform established, the rigid of each elastic system is obtained in conjunction with Elastic Contact Theory
Degree；Based on the connection relationship of each elastic system, in the movement direction by the stiffnes s equivalent of different motion component to guiding rail joint portion
Rigidity；
S42, rigidity of the guiding rail joint portion in the non-guide rail direction of motion is obtained；
Guiding rail joint portion is obtained non-in conjunction with the analytic formula of Elastic Contact Theory according to the kinetic model that step S2 is established
Rigidity in the guide rail direction of motion；
S5, Dynamics Simulation Analysis is carried out to finite element model；
The step S4 kinetic parameter got is brought into the finite element model of step S1 foundation, realizes the power of focusing platform
Credit analysis.
2. a kind of dynamic analysis method for lead screw guide rails formula space focusing platform according to claim 1, special
Sign is:
The finite element model of the focusing platform includes focusing platform pedestal (1), the fixing end on focusing platform pedestal (1)
(2), shaft coupling (3), ball-screw (4), rolling guide (5) and workbench (6)；
On the fixing end (2) and rolling guide (5) fixed focusing platform pedestal (1)；
The shaft coupling (3) and fixing end (2) are connected；
Described ball-screw (4) one end and shaft coupling (3) are connected, and the other end is connected by feed screw nut (7) and workbench (6)；
The workbench (6) is arranged on rolling guide (5) by guide rail slide block (8).
3. a kind of dynamic analysis method for lead screw guide rails formula space focusing platform according to claim 1, special
Sign is:
In step S2, the spring-damping element includes three pairs of Bar units and a Point unit；
Two Bar connect to form a pair of of Bar unit；
In global coordinate system, each guide rail ball is respectively equivalent using the progress of a pair of Bar unit on three translational degree of freedom, and three
To the same series connection node of Bar units shared；
Point unit is located on the series connection node；
Global coordinate system is rectangular coordinate system in space, and three axis directions are respectively the guide rail slide block direction of motion, and horizontal vertical is in guide rail
The direction of slide block movement, and the direction perpendicular to focusing platform pedestal.
4. a kind of dynamic analysis method for lead screw guide rails formula space focusing platform according to claim 3, special
Sign is:
The Bar unit is the Bar unit for assigning 1D Spring attribute；
The Point unit is the Point unit for assigning 0D Ground Mass attribute.
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| CN201910266141.0A CN110046413A (en) | 2019-04-03 | 2019-04-03 | A kind of dynamic analysis method for lead screw guide rails formula space focusing platform |
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| CN201910266141.0A CN110046413A (en) | 2019-04-03 | 2019-04-03 | A kind of dynamic analysis method for lead screw guide rails formula space focusing platform |
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|---|---|---|---|---|
| CN103294866A (en) * | 2013-05-31 | 2013-09-11 | 天津大学 | Tool-finite-element-analysis-oriented screw nut database creating method |
| CN106599480A (en) * | 2016-12-16 | 2017-04-26 | 中国科学院长春光学精密机械与物理研究所 | Modification method of space camera on-orbit micro-vibration simulation model |
| CN109522573A (en) * | 2017-09-20 | 2019-03-26 | 中国科学院长春光学精密机械与物理研究所 | A kind of emulation mode of optical remote sensing camera active optics system |
-
2019
- 2019-04-03 CN CN201910266141.0A patent/CN110046413A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294866A (en) * | 2013-05-31 | 2013-09-11 | 天津大学 | Tool-finite-element-analysis-oriented screw nut database creating method |
| CN106599480A (en) * | 2016-12-16 | 2017-04-26 | 中国科学院长春光学精密机械与物理研究所 | Modification method of space camera on-orbit micro-vibration simulation model |
| CN109522573A (en) * | 2017-09-20 | 2019-03-26 | 中国科学院长春光学精密机械与物理研究所 | A kind of emulation mode of optical remote sensing camera active optics system |
Non-Patent Citations (1)
| Title |
|---|
| 程鹏辉 等: ""空间相机调焦平台的动力学特性研究"", 《光学精密工程》 * |
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