Experimental Routes to Chaos in Ball Bearings

2007 ◽  
Author(s):  
B. Mevel ◽  
J. L. Guyader
Keyword(s):  
Theoretical Prediction ◽  
Resonant Frequency ◽  
Experimental Test ◽  
Test Bench ◽  
Ball Bearing ◽  
Ball Bearings ◽  
Poincaré Maps ◽  
Routes To Chaos ◽  
Theoretical Predictions ◽  
Experimental Test Bench

In a previous paper [1], the theoretical prediction of a ball bearing motion was studied and different routes to chaos described. The aim of this paper is to study experimentally routes to chaos in a ball bearing and to observe whether theoretical predictions of the phenomena are realistic. An experimental test bench was built and a technique to observe Poincare´ maps is proposed. The experience clearly shows the appearance of instability in the bearing motion, and two different routes to chaos are described as expected in theory. The first route is related to the first resonant frequency of the bearing. It is a sub-harmonic route. The second route, related to the second resonant frequency, is a quasi-periodic route.

Research on Dynamic Characteristic of Giant Magnetostrictive Actuator

2014 ◽  
Vol 513-517 ◽  
pp. 2880-2883
Author(s):  
Li Yi Li ◽  
Bai Ping Yan ◽  
Cheng Ming Zhang
Keyword(s):  
Resonant Frequency ◽  
Dynamic Characteristic ◽  
Equivalent Circuit ◽  
Experimental Test ◽  
Coupling Coefficient ◽  
High Frequency ◽  
Test Bench ◽  
Output Force ◽  
Magnetostrictive Actuator ◽  
Experimental Test Bench

The emphasis of this paper is to research dynamic characteristic of giant magnetostrictive actuator (GMA). First, a prototype of GMA driving by a Φ5×40mm GMM rod (Terfenol-D) is made and the experimental test-bench is set, the optimal pre-pressure of GMA is 129N, and GMA can made 39.5μm strain with 218N output force under 5A current. Then, the energy of electrical, magnetic and mechanical of GMA is studied, equivalent circuit of energy conversion is summarized. At last, dynamic characteristic of GMA is measured, and hysteresis of strain under high frequency is tested. The results show that the resonant frequency of GMA is 1200Hz, and the magnetostriction coupling coefficient up to 0.572. The output strain of GMA increase with the frequency increasing before resonant frequency, and GMA has max output strain (49μm) under 1A current at 1200Hz.

Prediction of Ball Motion in High-Speed Thrust-Loaded Ball Bearings

1976 ◽  
Vol 98 (3) ◽  
pp. 463-469 ◽  
Author(s):  
C. R. Gentle ◽  
R. J. Boness
Keyword(s):  
Computer Program ◽  
High Speed ◽  
Ball Bearing ◽  
Viscoelastic Behavior ◽  
Specific Situation ◽  
Fluid Models ◽  
Ball Bearings ◽  
Theoretical Predictions ◽  
Ball Motion

This paper describes the development of a computer program used to analyze completely the motion of a ball in a high-speed, thrust-loaded ball bearing. Particular emphasis is paid to the role of the lubricant in governing the forces and moments acting on each ball. Expressions for these forces due to the rolling and sliding of the ball are derived in the light of the latest fluid models, and estimates are also made of the cage forces applicable in this specific situation. It is found that only when lubricant viscoelastic behavior is considered do the theoretical predictions agree with existing experimental evidence.

scholarly journals Modeling and controller design for an experimental test bench for aircraft actuators

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881536 ◽  
Author(s):  
Yong Zhou ◽  
Xiaogang Zhou
Keyword(s):  
Experimental Test ◽  
Test Bench ◽  
Controller Design ◽  
Operating Conditions ◽  
Control Performance ◽  
Proportional Integral Derivative ◽  
Hydraulic Actuator ◽  
Aerodynamic Forces ◽  
Ground Testing ◽  
Experimental Test Bench

The reliable and repeatable experimental ground testing of aircraft actuator is an essential phase before flight testing. It is not an easy task to simulate the alternating aerodynamic forces on actuators reasonably and accurately in a laboratory. In this article, an experimental test bench is designed to simulate the aerodynamic forces by a hydraulic actuator, which replicates the operating conditions that the actuator will encounter in service. In order to improve the force control performance, a feed-forward compensator and a fuzzy proportional–integral–derivative controller are designed. Both simulation and experimental results show that the designed method can improve the control performance.

scholarly journals EXPERIMENTAL TEST-BENCH FOR RESEACHING PROPERTIES OF FUEL-LUBRICANT MATERIALS

2013 ◽  
Vol 54 (1) ◽  
Author(s):  
Оleksii Puzik ◽  
Gennadii Zaionchkovskyi ◽  
Taras Tarasenko
Keyword(s):  
Experimental Test ◽  
Test Bench ◽  
Experimental Test Bench

scholarly journals A Novel Experimental Test Bench to Investigate the Effects of Cutting Fluids on the Frictional Conditions in Metal Cutting

2020 ◽  
Vol 4 (2) ◽  
pp. 45 ◽  
Author(s):  
Thomas Lakner ◽  
Marvin Hardt
Keyword(s):  
Experimental Test ◽  
Metal Cutting ◽  
Test Bench ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Machining Processes ◽  
Workpiece Material ◽  
Fluid Supply ◽  
Frictional Forces ◽  
Experimental Test Bench

The tribological effect of cutting fluids in the machining processes to reduce the friction in the cutting zone is still widely unknown. Most test benches and procedures do not represent the contact conditions of machining processes adequately, especially for interrupted contacts. This results in a lack of knowledge of the tribological behavior in machining processes. To close this knowledge gap, a novel experimental test bench to investigate the effects of cutting fluids on the frictional conditions in metal cutting under high-pressure cutting fluid supply was developed and utilized within this work. The results show that there is a difference between the frictional forces in interrupted contact compared to continuous contact. Furthermore, the cutting fluid parameters of supply pressure, volumetric flow rate, and impact point of the cutting fluid jet influence the frictional forces, the intensities of which depend on the workpiece material. In conclusion, the novel test bench allows examining the frictional behavior in interrupted cuts with an unprecedented precision, which contributes to a knowledge-based design of the cutting fluid supply for cutting tools.

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