Analytical and Experimental Identification of Nonlinearities in a Single-Nut, Preloaded Ball Screw

1997 ◽  
Vol 119 (1) ◽  
pp. 15-19 ◽  
Author(s):  
J. F. Cuttino ◽  
T. A. Dow ◽  
B. F. Knight
Keyword(s):  
Linear Optimization ◽  
Axial Loading ◽  
Rolling Friction ◽  
Ball Screw ◽  
Experimental Identification ◽  
Ball Spinning ◽  
Angle Rotation ◽  
Angular Displacements ◽  
Nonlinear Performance ◽  
Relationship Of

The nonlinear performance of a single-nut, preloaded ball screw actuator is analyzed in this paper. The study identifies the source of nonlinear torque in the ball screw and subsequently maps that torque into the nonlinear displacement response due to windup in the shaft. The study is complemented with an experimental verification using a small angle rotation fixture (ARC) to input very small amplitude angular displacements to the screw while measuring induced torque and displacements. The experimental results are obtained from a Precision Linear Optimization Testbed (PLOT) which was developed to study the ability of different actuator systems to provide long range motion with nanometer accuracy. The analysis is conducted for the case of no axial loading. The study shows that the nonlinearities in the ball screw originate in the rolling friction between the balls and the races which induces torque in the nut and subsequently windup in the shaft. It also shows that the torque can be deduced from a relationship of the torque between a ball spinning in a race.

scholarly journals Stress-strain model for grade 275 reinforcing steel with cyclic loading

1978 ◽  
Vol 11 (2) ◽  
pp. 101-109 ◽  
Author(s):  
K. J. Thompson ◽  
R. Park
Keyword(s):  
Axial Loading ◽  
Strain Curve ◽  
Cyclic Stress ◽  
Stress Strain ◽  
Reinforcing Bar ◽  
Strain Behaviour ◽  
Strain Relationship ◽  
Reversed Loading ◽  
Relationship Of ◽  
Strain Model

The stress-strain relationship of Grade 275 steel reinforcing bar under cyclic (reversed) loading is examined using experimental results obtained previously from eleven test specimens to which a variety of axial loading cycles has been applied. A Ramberg-Osgood function is fitted to the experimental stress-strain curves to follow the cyclic stress-strain behaviour after the first load run in the plastic range. The empirical constants in the function are determined by regression analysis and are found to depend mainly on the plastic strain imposed
in the previous loading run. The monotonic stress-strain curve for the steel, with origin of strains suitably adjusted, is assumed to be the envelope curve giving the upper limit of stress. The resulting Ramberg-Osgood expression and envelope is found to give good agreement with the experimentally measured cyclic stress-strain curves.

MATHEMATICAL MODELING AND EXPERIMENTAL IDENTIFICATION OF BACKLASH NONLINEARITY IN PROTOTYPE OF A ROBOT GANTRY WITH ELECTRIC DRIVE AND BALL SCREW TRANSMISSION

2015 ◽  
Author(s):  
Angelo Fernando Fiori ◽  
Ismael Barbieri Garlet ◽  
Odmartan Ribas Maciel ◽  
Andrei Fiegenbaum ◽  
Antonio Carlos Valdiero ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Electric Drive ◽  
Ball Screw ◽  
Experimental Identification ◽  
Backlash Nonlinearity

Reliability Research of Masonry Column Strengthened with CFRP Based on Monte-Carlo Method

2010 ◽  
Vol 163-167 ◽  
pp. 3079-3083
Author(s):  
Li Li ◽  
Hong Yi Jiang ◽  
Yi Zheng ◽  
Yu Lin Yang ◽  
Mei Zhu Sun
Keyword(s):  
New Technology ◽  
Axial Loading ◽  
Random Variable ◽  
Reinforced Plastics ◽  
Reinforced Masonry ◽  
Brick And Mortar ◽  
The Stability ◽  
Relationship Of ◽  
The Relationship ◽  
Engineering Personnel

CFRP(Carbon Fiber Reinforced Plastics) reinforced structure, as one kind of new technology, has been applied extensively in concrete structure, and CFRP reinforced masonry structure has been began studying and applied. But reliability research of masonry strengthened with CFRP is less, which restrains applying of CFRP. In the paper, Combined with the theory of reliability and tests, supposed that it is basic random variable that strength of brick and mortar and geometry dimension of members and effect of load, it is established that the stability probabilistic formula of brick column reinforced by CFRP under axial-loading. Its reliability is calculated, by means of Matlab. Under the action of different loads and total loads being constant, it is analyzed that the relationship of index of reliability and ratio of loading effect. Some useful results are gotten. And the result calculated is reasonable and reliable and it may supply engineering personnel with computer basis.

High Fidelity Model of a Ball Screw Drive for a Flight Control Servoactuator

2017 ◽  
Author(s):  
Antonio C. Bertolino ◽  
Giovanni Jacazio ◽  
Stefano Mauro ◽  
Massimo Sorli
Keyword(s):  
Sensitivity Analysis ◽  
Flight Control ◽  
Contact Stiffness ◽  
Rolling Friction ◽  
Operating Conditions ◽  
Ball Screw ◽  
High Fidelity ◽  
Health State ◽  
Electric Equipment ◽  
Fidelity Model

Over the past years, a trend toward “more electric” equipment has arisen including flight control systems, leading to a tendency to replace the electro-hydraulic actuators (EHSAs) with electro-mechanical actuators (EMAs), which have however a too high jamming probability for a primary flight control system. An innovative jam tolerant approach is to make the EMA “jam-predictive” by monitoring its health state using effective prognostic algorithms. The need for a high-fidelity model is then paramount. In this study, basing on a typical architecture of an EMA, a detailed analysis of the developed dynamic non-linear ball screw model is presented. The backlash, friction parameters, a model of the rolling/sliding behaviour of a ball with rolling friction are taken into account, contact stiffness and preload are introduced. A discussion is presented on the results of a sensitivity analysis on the efficiency of the mechanism with respect to the above mentioned characteristic parameters under different operating conditions. The model and the results of the sensitivity analysis can be used to better understand the physics within the actuator and the ensuing fault-to-failure mechanisms which are needed for developing more efficient prognostic algorithms.

MODELING AND EXPERIMENTAL IDENTIFICATION OF FRICTION NONLINEARITY IN A BALL SCREW MECHANICAL TRANSMISSION TYPE IN A GANTRY ROBOT

2015 ◽  
Author(s):  
Angelo Fernando Fiori ◽  
Leonardo Maraschin Bortolon ◽  
Rozimerli Raquel Milbeier Richter ◽  
Antonio Carlos Valdiero ◽  
Luiz Antonio Rasia
Keyword(s):  
Ball Screw ◽  
Mechanical Transmission ◽  
Experimental Identification ◽  
Gantry Robot

Research on the Impact between Balls and Re-Circulating Mechanism of Ball Screws

2014 ◽  
Vol 551 ◽  
pp. 370-377 ◽  
Author(s):  
Zuo Ying Zhang ◽  
Wan Li Zhang ◽  
Chi Xu
Keyword(s):  
Contact Time ◽  
Impact Force ◽  
Impact Angle ◽  
Ball Screw ◽  
Hertz Contact ◽  
Elastic Coefficient ◽  
Impact Theory ◽  
Time Calculation ◽  
Relationship Of ◽  
The Impact

A Mechanical model of impact and contact between the ball and re-circulating mechanism in ball screw was brought forward according to the Hertz contact model and classical impact theory, along with the joint relationship of re-circulating mechanism and nut taken into account. Then the formula of the impact force and contact time was induced, which the elastic coefficient of restitution was considering in contact time calculation. Moreover, a special test unit was designed for contact time measurement and the contact time was measured. The result indicates that the new model proposed in this paper is closer to the practical situation than the old model proposed in literature. Based on works mentioned above, the influence of impact angle, parameters of structure and material on impact force was analyzed by numerical simulation.

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