Assessment of the Vibration Excitation and Optimization of Cylindrical Gears

2011 ◽  
Author(s):  
Bernd-Robert Ho¨hn ◽  
Michael Heider ◽  
Karsten Stahl ◽  
Michael Otto ◽  
Jens Bihr
Keyword(s):  
Load Capacity ◽  
High Load ◽  
Noise Generation ◽  
Variable Speed ◽  
Dynamic Effects ◽  
Calculation Methods ◽  
Gear Mesh ◽  
Cylindrical Gears ◽  
Resonance Behavior ◽  
High Load Capacity

Vibration and noise generation of gear stages is mainly caused by the excitation of the gear mesh. This excitation is significantly influenced by geometry of the tooth. Here, both the macro-geometry (main geometry) and the micro-geometry (flank corrections) of the teeth are important. Corrections of the tooth flanks usually have to meet the requirements of low excitation and high load capacity. Furthermore it is oftenly necessary, especially for transmissions with variable speed, to account for the dynamic effects (e.g. resonance behavior) of noise excitation. The computer program DZP (Dynamic Tooth Force Program) provides extensive calculation methods for analyzing mesh excitation and transmission dynamics. The frame program DZPopt provides extensive possibilities to determine an optimum excitation flank correction based on the calculation capabilities of DZP.

An Air Layer Modeling Approach for Air and Air/Vacuum Bearings

1997 ◽  
Vol 119 (3) ◽  
pp. 388-392
Author(s):  
J. M. Pitarresi ◽  
K. A. Haller
Keyword(s):  
Load Capacity ◽  
Load Resistance ◽  
High Load ◽  
Air Bearing ◽  
Air Bearings ◽  
Bearing Surface ◽  
Know How ◽  
Modeling Approach ◽  
Vibrational Characteristics ◽  
High Load Capacity

Air layer supported bearing pads, or “air bearings” as they are commonly called, are popular because of their high load capacity and low in-plane coefficient of friction, making them well suited for supporting moving, high accuracy manufacturing stages. Air/vacuum bearings enhance these capabilities by giving the bearing pad load resistance capacity in both the upward and downward directions. Consequently, it is desirable to know how to model the air layer between the bearing pad and the bearing surface. In this paper, a simple finite element modeling approach is presented for investigating the vibrational characteristics of an air layer supported bearing. It was found that by modeling the air layer as a bed of uniform springs who’s stiffness is determined by load-displacement tests of the bearing, a reasonable representation of the response can be obtained. For a bearing supported by air without vacuum, the dynamic response was very similar to that of a freely supported bearing. The addition of vacuum to an air bearing was found to significantly lower its fundamental frequency which could lead to unwanted resonance problems.

A one-stage, high-load capacity separation actuator using anti-friction rollers and redundant shape memory alloy wires

2015 ◽  
Vol 86 (12) ◽  
pp. 125005 ◽  
Author(s):  
Yan Xiaojun ◽  
Huang Dawei ◽  
Zhang Xiaoyong ◽  
Liu Ying ◽  
Yang Qiaolong
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Load Capacity ◽  
High Load ◽  
One Stage ◽  
High Load Capacity

scholarly journals Analysis of the geometry and contact density of globoid gearing

2020 ◽  
Vol 329 ◽  
pp. 03008
Author(s):  
Aleksandr Vyatkin
Keyword(s):  
Numerical Methods ◽  
Load Capacity ◽  
High Load ◽  
Design Stage ◽  
Energy Losses ◽  
Technological Parameters ◽  
Contact Density ◽  
Small Energy ◽  
Worm Gears ◽  
High Load Capacity

Globoid worm gears have been widely applied in a range of technological branches in which other types of worm gears are less effective. The main functional indicators which facilitated their popularity include high load capacity and durability, low vibroactivity and small energy losses. As the experience of application and the results of the study of globoid worm gears showed, the level of operational properties of globoid gears is higher than that of the others only if the gearing and technological parameters of their manufacturing are optimally chosen during the design stage. This paper describes a method for estimating the gearing parameters of a globoid gear with an account of the geometry of the elements (the geometry of the teeth of the wheel and the worm thread), namely the calculation of the gap fields in the globoid gearing by means of numerical methods.

THE USE OF ADAPTIVE FRICTION COUPLINGS IN THE DRIVES OF EQUIPMENT

2020 ◽  
Author(s):  
N. V. Moiseeva ◽  
Keyword(s):  
Load Capacity ◽  
High Accuracy ◽  
High Load ◽  
Loading Capacity ◽  
Rational Application ◽  
Average Accuracy ◽  
High Load Capacity

The systematization of adaptive friction clutches of all types and generations on the basis of rated load capacity and accuracy of operation is carried out. The systematization allows us to divide all the variety of designs of adaptive friction couplings at groups with particularly high accuracy and low nominal loading capacity, with average accuracy and the rated load capacity and low accuracy and high load capacity. The carried out systematization allows to define areas of rational application of groups of adaptive friction clutches.

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