A Theoretical and Experimental Investigation of Contact Loss in the Clearances of a Four-Bar Mechanism

1986 ◽  
Vol 108 (2) ◽  
pp. 237-244 ◽  
Author(s):  
M. T. Bengisu ◽  
T. Hidayetoglu ◽  
A. Akay
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Model Prediction ◽  
Present Model ◽  
Experimental Studies ◽  
Static Model ◽  
New Criterion ◽  
Theoretical Results

The dynamic behavior of a four-bar mechanism with a clearance at any one of its connections is described using a quasi-static model. Prediction of separation at the joints is based on the deviation of the model at these positions from the zero-clearance values. Corresponding experimental studies have verified the theoretical results satisfactorily. Furthermore, the present model was applied successfully to similar cases published earlier. The existing criteria on the prediction of contact loss are discussed and a new criterion is offered.

Theoretical and Experimental Investigation of Vibration Damping Sheet Dynamic Behavior

2017 ◽  
Vol 265 ◽  
pp. 439-444
Author(s):  
V.D. Cherkasov ◽  
Yuriy V. Yurkin ◽  
V.V. Avdonin
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Loss Factor ◽  
Experimental Studies ◽  
Structure Optimization ◽  
Theoretical Data ◽  
Vibration Damping ◽  
Damping Properties ◽  
Thin Slab ◽  
High Loss

A great deal of attention is presently being drawn to the question of noise and vibration damping. One of the basic means of the effective damping of unfavorable noises and vibrations is the usage of special sheets with high vibration and noise damping properties in thin-slab structures. In this article the results of a study of the dynamic behavior (of the loss factor) of multilayer vibration damping sheets are being described. The aim of this article is to show the design optimization of multilayer vibration damping sheets, carrying a high loss factor. The theoretical prerequisites for the structure optimization of vibration damping sheets, having a high loss factor, have been determined. The experimental studies on the influence of the thickness of the vibration damping layer, thickness and Young’s modulus of experimental with theoretical data have also been carried out. More effective designs of multilayer vibration damping sheets have been scientifically substantiated.

Transient response of the 1-st order dynamic system with fluctuating parameters

1979 ◽  
Vol 44 (7) ◽  
pp. 2184-2195
Author(s):  
Vladimír Herles ◽  
Jan Čermák ◽  
Antonín Havlíček
Keyword(s):  
Dynamic System ◽  
Dynamic Behavior ◽  
Transient Response ◽  
Flow Model ◽  
Stirred Tank ◽  
Order System ◽  
Random Parameters ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Theoretical Results

The paper deals with the analysis of the dynamic behavior of the 1st order system with two random parameters. The theoretical results have been compared with experiments on flow model of a stirred tank reactor.

scholarly journals Selecting a Model for Forecasting

Econometrics ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 26
Author(s):  
Jennifer L. Castle ◽  
Jurgen A. Doornik ◽  
David F. Hendry
Keyword(s):  
Structural Breaks ◽  
Simulation Experiment ◽  
Structural Break ◽  
Static Model ◽  
Forecast Period ◽  
Forecast Performance ◽  
Significance Level ◽  
Forecasting Models ◽  
Theoretical Results

We investigate forecasting in models that condition on variables for which future values are unknown. We consider the role of the significance level because it guides the binary decisions whether to include or exclude variables. The analysis is extended by allowing for a structural break, either in the first forecast period or just before. Theoretical results are derived for a three-variable static model, but generalized to include dynamics and many more variables in the simulation experiment. The results show that the trade-off for selecting variables in forecasting models in a stationary world, namely that variables should be retained if their noncentralities exceed unity, still applies in settings with structural breaks. This provides support for model selection at looser than conventional settings, albeit with many additional features explaining the forecast performance, and with the caveat that retaining irrelevant variables that are subject to location shifts can worsen forecast performance.

Study of a Vibratory Feeder with Repulsive Surface Which Has Directional Characteristic

1980 ◽  
Vol 102 (1) ◽  
pp. 94-101 ◽  
Author(s):  
S. Okabe ◽  
Y. Yokoyama
Keyword(s):  
Experimental Studies ◽  
Directional Characteristic ◽  
Vibratory Feeder ◽  
The Mean ◽  
Theoretical Results

This paper treats the motion of a particle on a vibratory feeder whose track has directional characteristic in repulsive motion, for examples, obliquely bristled track, obliquely sliced track and so on. Under some assumptions, the practical equation for predicting the mean conveying velocity is shown and the relations between conveying condition and the mean conveying velocity are clarified theoretically. These relations are shown in various diagrams. Referring these diagrams, the optimum conveying conditions are discussed also. The theoretical results show that the mean conveying velocity is considerably larger than that of the ordinary feeder. The theoretical results are confirmed by experimental studies.

A self-oscillating gel system with complex dynamic behavior based on a time delay between the oscillations

Soft Matter ◽  
2021 ◽  
Author(s):  
Xiuchen Li ◽  
Jie Li ◽  
Zhaohui Zheng ◽  
Jinni Deng ◽  
Yi Pan ◽  
...  
Keyword(s):  
Time Delay ◽  
Dynamic Behavior ◽  
Experimental Studies ◽  
Complex Dynamic ◽  
Chemical Oscillation ◽  
Mechanical Oscillation ◽  
Behavior Based ◽  
Gel System

The time delay existing between the chemical oscillation and mechanical oscillation (C-M delay) in a self-oscillating gel (SOG) system is observable in previous experimental studies. However, how the C-M delay...

scholarly journals MHD-waves in the geomagnetic tail: A review

10.12737/7168 ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 4-22 ◽  
Author(s):  
Анатолий Леонович ◽  
Anatoliy Leonovich ◽  
Виталий Мазур ◽  
Vitaliy Mazur ◽  
Даниил Козлов ◽  
...  
Keyword(s):  
Numerical Models ◽  
Experimental Studies ◽  
Low Frequency ◽  
Detailed Comparison ◽  
Mhd Waves ◽  
Theoretical Studies ◽  
Geomagnetic Tail ◽  
Magnetopause Oscillations ◽  
Experimental And Theoretical Studies ◽  
Theoretical Results

This article presents the review of experimental and theoretical studies on ultra-low-frequency MHD oscillations of the geomagnetic tail. We consider the Kelvin–Helmholtz instability at the magnetopause, oscillations with a discrete spectrum in the “magic frequencies” range, the ballooning instability of coupled Alfvén and slow magnetosonic waves, and “flapping” oscillations of the current sheet of the geomagnetic tail. Over the last decade, observations from THEMIS, CLUSTER and Double Star satellites have been of great importance for experimental studies. The use of several spacecraft allows us to study the structure of MHD oscillations with high spatial resolution. Due to this, we can make a detailed comparison between theoretical results and those obtained from multi-spacecraft studies. To make such comparisons in theoretical studies, in turn, we have to use the numerical models closest to the real magnetosphere.

scholarly journals UNIVERSAL THREE-PHASE FERRORESONANCE STABILIZERS

2016 ◽  
Vol 19 (1) ◽  
Author(s):  
GEORGI GEORGIEV ◽  
NADEZHDA EVSTATIEVA
Keyword(s):  
Comparative Analysis ◽  
Experimental Studies ◽  
Voltage Stabilizer ◽  
Satisfactory Accuracy ◽  
Three Phase ◽  
Theoretical Results

A comparative analysis has been carried out on two options of three-phase parametric current sources (inductive-capacitive stabilizers). Their capacities to operate in voltage stabilizer mode have been studied. Such capacities were proven and their conditions were defined. Theoretical results were experimentally checked and confirmed with satisfactory accuracy. Based on theoretical and experimental studies it was proven that the considered systems can operate in both modes – as current and voltage stabilizers.

scholarly journals Experimental Investigation of the Effects of Seat Position on Human Dynamic Behavior.

2000 ◽  
Vol 43 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Shuji NISHIYAMA ◽  
Norio UESUGI ◽  
Toru TAKESHIMA ◽  
Yuji KANO
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Seat Position
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