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Double-nut planetary roller screw dynamics research method based on elastic deformation

A planetary roller and elastic deformation technology, applied in constraint-based CAD, complex mathematical operations, geometric CAD, etc., can solve the problem of inability to calculate the pretightening force of double nuts, the inability to calculate the deformation state of parts, and the inability to consider the force and deformation of parts issues such as the impact of

Active Publication Date: 2020-12-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Rigid body dynamic models, such as "Anonlinear six degrees of freedom dynamic model of planetary roller screw mechanism" and "An efficient method for the dynamic analysis of planetary roller screw mechanism", cannot calculate the deformation state of each part, so the preload on the double nut cannot be calculated force
Single-nut planetary roller screw stiffness and load distribution models, such as "Research on Design Method of Planetary Roller Screw Pair Thread Tooth Load Sharing" and "Planetary Roller Screw Pair Roller Load Distribution Considering Error", cannot consider motion The influence of state changes on the stress and deformation of each part
According to the calculation results of the published stiffness and load distribution model, the elastic deformation of the screw, roller and nut threads can have a significant impact on the load distribution between the thread teeth, but this has been ignored in the existing dynamic analysis. an important factor

Method used

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  • Double-nut planetary roller screw dynamics research method based on elastic deformation
  • Double-nut planetary roller screw dynamics research method based on elastic deformation
  • Double-nut planetary roller screw dynamics research method based on elastic deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0243] The selected working condition parameter is that the input speed of the lead screw changes in a sinusoidal form, that is,

[0244]

[0245] In the formula, ——rotational speed of lead screw; t——simulation time;

[0246] The angular acceleration of the lead screw is:

[0247]

[0248] The nut load for a double nut planetary roller screw is:

[0249]

[0250] In the formula:

[0251] f Nz ——Nut load; L S - the lead of the screw;

[0252] The structural parameters and quality parameters of the double-nut planetary roller screw are shown in Table 1 and Table 2, respectively. Select the initial preload between the double nuts as F pre0 =3000N, then the pretightening force of 1# nut and 2# nut, F pre1 and F pre2 Variation with nut load as Figure 9 As shown, the slip-to-roll ratio between the screw and the rollers and the contact force between the cage and the ring gear and the rollers change as Figure 10 , where (a) is the slip-roll ratio change curve be...

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Abstract

The invention discloses a double-nut planetary roller screw dynamics research method based on elastic deformation. The method comprises the following steps: S1, building a double-nut planetary rollerscrew spring quality system which comprehensively considers the elastic deformation, inertia force and pre-tightening force according to the structural features of a double-nut planetary roller screw;s2, calculating an adjoint matrix and a rigidity matrix of the spring mass system; s3, establishing a stress-deformation-motion parameter coupled double-nut planetary roller screw elastic kinetic equation; s4, establishing a rigid body motion equation of the lead screw and the pin roller; and S5, solving the elastic kinetic equation in the step S3 in combination with the rigid body motion equation of the lead screw and the pin roller in the step S4. According to the research method, a stress-deformation-motion parameter coupled double-nut planetary roller screw elastic kinetic equation is provided, and the pre-tightening force, deformation, load distribution and motion state of the mechanism under different use working conditions are obtained by solving the equation.

Description

technical field [0001] The invention relates to the technical field of planetary roller screw drive dynamics, in particular to a method for researching the dynamics of a double-nut planetary roller screw based on elastic deformation. Background technique [0002] The current research focus of scholars on the dynamics of the planetary roller screw is mainly concentrated on the single nut planetary roller screw without preload, and is limited to the analysis of rigid body dynamics. The focus of research on the elastic deformation of planetary roller screws is mainly on the stiffness and load distribution model of a static single-nut planetary roller screw without preload. Rigid body dynamic models, such as "Anonlinear six degrees of freedom dynamic model of planetary roller screw mechanism" and "An efficient method for the dynamic analysis of planetary roller screw mechanism", cannot calculate the deformation state of each part, so the preload on the double nut cannot be calcu...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/17G06F17/16G06F17/11G06F111/04G06F119/14
CPCG06F30/20G06F17/11G06F17/16G06F30/17G06F2111/04G06F2119/14Y02T90/00
Inventor 付晓军刘更李欣王海伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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