Modelling of static contact with friction of threaded surfaces in a planetary roller screw mechanism

Ma, Shangjun; Wu, Linping; Fu, Xiaojun; Li, Yajie; Li, Geng

doi:10.1016/j.mechmachtheory.2019.04.014

Cited by 31 publications

(22 citation statements)

References 20 publications

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“…The possible reasons are as follows: 1) the deformation measured by experiment also contains other deformations such as the structural deformation of the test rig, the clearances of the sensors and the clearances of the components of PRSM [11][12]; 2) the accuracy coefficient is an empirical value, which requires a lot of experiments to obtain. In addition, the selection of accuracy coefficient in this paper refers to the BSM, and the axial stiffness of PRSM may be more sensitive to machining errors.…”

Section: Resultsmentioning

confidence: 99%

Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism

Zhang

et al. 2020

MATEC Web Conf.

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This paper investigates the static stiffness characteristics of the planetary roller screw mechanism (PRSM). Firstly, an analytical model of elastic deformation in the PRSM considering contact deformation, combined deformation of screw shaft and thread deformations is established. Then, an accuracy coefficient is introduced to take into account the effect of machining error and assembly error on elastic deformation. Secondly, the stiffness tests of the PRSM are performed under different loads and nut positions. Lastly, the correctness of the analytical results is verified via the comparison with experimental results. The results show that the analytical results are in good agreement with the experimental results, and the stiffness variations under different loads and nut positions are obtained.

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Section: Resultsmentioning

confidence: 99%

Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism

Zhang

et al. 2020

MATEC Web Conf.

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“…As shown in Table 5, Defining the number of the rollers is seven, the vibration modes of the PRSM can be obtained by Eq. (12), and the results indicate that:…”

Section: Modal Analysismentioning

confidence: 92%

“…And Jones et al [11] also proposed the dynamics equations of motion for the screw, rollers, and nut of PRSM by Lagrange's Method and derived their steady-state angular velocities and screw/roller slip velocities. Ma and his colleagues [12] studied the contact characteristics of threaded surfaces under the combined action of normal pressure and tangential friction forces, and derived not only the velocities of the contact points in the contact ellipse but also the normal pressure and friction force distributions. Fu et al [13] developed a nonlinear six degrees of freedom dynamic model, in which the load distribution coefficient is introduced to describe the load distribution among threads of PRSM, and studied the transient and steady-state behaviours of the PRSM under a heavy and light external load, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model of Planetary Roller Screw Mechanism with Considering Torsional Degree of Freedom

Wan

et al. 2020

MATEC Web Conf.

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To predict accurately the dynamics performance of planetary roller screw mechanism, it is necessary to establish its streamline and engineering-compliant dynamic model, which is the basis of mechanical design and precision control of the system. In this paper, the relative displacement between roller and ring gear along the line of action is deduced and the relationship between nature frequencies and the number of rollers is discussed. Considering the torsional stiffness of all components and the thread mesh stiffness based on the Hertzian contact theory, the purely torsional model for planetary roller screw mechanism is presented to reveal the natural frequencies and vibration mode characteristics of the system. The results show that the natural properties of undamped system in planetary roller screw mechanism are mainly reflected by two typical vibration modes: rotational mode and roller mode.

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“…In the subsequent analysis, the friction coefficient must be set. e sliding friction coefficient is f s � 0.2, and the rolling friction coefficient is f r � 0.1 [22]. Axial loads and constraints are added.…”

Section: Analysis Of Transmission Efficiencymentioning

confidence: 99%

Friction Torque Analysis of Planetary Roller Screw Mechanism in Roller Jamming

Zheng

et al. 2020

Mathematical Problems in Engineering

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The load distribution model of the planetary roller screw mechanism (PRSM) is established on the basis of Hertz contact theory. The objective is to obtain a friction torque model of the PRSM in roller jamming. An example is provided to calculate the friction torque of the PRSM in roller jamming. Thereafter, the transmission efficiency is calculated. A static structural analysis is performed using the finite element method to estimate the contact stress between the threads of the PRSM components. Computational results indirectly reveal that roller jamming exerts considerable influence on the friction torque of the PRSM. Results show that the friction torque of the planetary roller screw increases when the roller is jammed and the wear of the parts is accelerated. This condition leads to structural failure. The results of this study can serve as a foundation for electromechanical actuation systems, which can be useful in designing antijamming systems for safety-critical aircraft applications.

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Modelling of static contact with friction of threaded surfaces in a planetary roller screw mechanism

Cited by 31 publications

References 20 publications

Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism

Experimental Research on Static Stiffness of the Planetary Roller Screw Mechanism

Dynamic Model of Planetary Roller Screw Mechanism with Considering Torsional Degree of Freedom

Friction Torque Analysis of Planetary Roller Screw Mechanism in Roller Jamming

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