scholarly journals ASSESSMENT OF DYNAMIC FEATURES OF MECHANICAL OSCILLATORS FOR A ROOT-BALLING MACHINE WITH A VIBRATING BLADE

2009 ◽  
Vol 40 (4) ◽  
pp. 1
Author(s):  
Dario Friso ◽  
Marco Bietresato
Keyword(s):  
Theoretical Analysis ◽  
Motion Analysis ◽  
Dynamic Features ◽  
Mechanical Oscillator ◽  
Strong Phase ◽  
Harmonic Motion ◽  
Phase Displacement ◽  
Air Motion ◽  
Mechanical Oscillators ◽  
Oscillating Motion

A theoretical analysis of the oscillating motion produced by a mechanical oscillator for the vibrating blade of a root-balling machine was carried out. The result was harmonic motion with a strong phase displacement with respect to the forcing torque of the eccentric masses; however, the amplitude can be approximately calculated by in-air motion analysis. Experiments were also carried out in order to determine the cutting torque of the blade in typical treenursery soil. These results, together with the indications of other literature reports, were used to propose a possible design directive.

scholarly journals From metaphors to equations: How can we find the good ones?

2000 ◽  
Vol 23 (3) ◽  
pp. 409-410
Author(s):  
Gottfried Mayer-Kress
Keyword(s):  
Boundary Conditions ◽  
Forest Fire ◽  
Water Waves ◽  
Standing Waves ◽  
Musical Instruments ◽  
Oscillator Model ◽  
Mechanical Oscillator ◽  
Target Article ◽  
Mechanical Oscillators

Among the metaphors used in the target article are “musical instruments,” “water waves,” and other types of mechanical oscillators. The corresponding equations have inertial properties and lead to standing waves that depend on boundary conditions. Other, physiologically relevant quantities like refractory times are not contained in the mechanical oscillator model but occur naturally, for instance, in biological forest fire metaphors.

CONTROL OF A DOUBLE IMPACTING MECHANICAL OSCILLATOR USING DISPLACEMENT FEEDBACK

2004 ◽  
Vol 14 (09) ◽  
pp. 3095-3113 ◽  
Author(s):  
E. GUTIÉRREZ ◽  
D. K. ARROWSMITH
Keyword(s):  
Periodic Orbits ◽  
Dynamical Behavior ◽  
Mechanical Oscillator ◽  
Harmonic Motion ◽  
Simple Harmonic Motion

A model which allows a double impacting regime for a particle undergoing simple harmonic motion is considered in some detail. The behavior of the particle in the weak spring limit is considered. Symmetries of the motion are found and the extent of the resonant dynamical behavior is considered. Control equations are developed and strategies are described for both the preservation and the annihilation of experimental and analytical resonant periodic orbits.

LDA Measurement and a Theoretical Analysis of the In-Cylinder Air Motion in a DI Diesel Engine

1985 ◽  
Author(s):  
Shin Matsuoka ◽  
Takeyuki Kamimoto ◽  
Tomonori Urushihara ◽  
Yoshihiro Mochimaru ◽  
Hideo Morita
Keyword(s):  
Diesel Engine ◽  
Theoretical Analysis ◽  
Di Diesel Engine ◽  
Air Motion ◽  
Lda Measurement

scholarly journals Quantum amplification of mechanical oscillator motion

Science ◽  
2019 ◽  
Vol 364 (6446) ◽  
pp. 1163-1165 ◽  
Author(s):  
S. C. Burd ◽  
R. Srinivas ◽  
J. J. Bollinger ◽  
A. C. Wilson ◽  
D. J. Wineland ◽  
...  
Keyword(s):  
Quantum Noise ◽  
Energy State ◽  
Quantum Fluctuations ◽  
Zero Point ◽  
Small Displacement ◽  
Mechanical Oscillator ◽  
Trapped Ion ◽  
Mechanical Oscillators ◽  
Quantum Amplification

Detection of the weakest forces in nature is aided by increasingly sensitive measurements of the motion of mechanical oscillators. However, the attainable knowledge of an oscillator’s motion is limited by quantum fluctuations that exist even if the oscillator is in its lowest possible energy state. We demonstrate a technique for amplifying coherent displacements of a mechanical oscillator with initial magnitudes well below these zero-point fluctuations. When applying two orthogonal squeezing interactions, one before and one after a small displacement, the displacement is amplified, ideally with no added quantum noise. We implemented this protocol with a trapped-ion mechanical oscillator and determined an increase by a factor of up to 7.3 (±0.3) in sensitivity to small displacements.

scholarly journals THE THEORETICAL ANALYSIS OF THE INDIVIDUALTYPOLOGICAL PERSONAL FEATURES INFLUENCE ON THE ACTIVITY EFFICIENCY PROBLEM

2020 ◽  
pp. 39-53
Author(s):  
M. O. Yelesina
Keyword(s):  
Theoretical Analysis ◽  
Information Technologies ◽  
Professional Activity ◽  
Dynamic Features ◽  
Significant Information ◽  
Professional Performance ◽  
Rapid Pace ◽  
The Subject ◽  
The Individual ◽  
And Storage

The article presents a theoretical look on the problem of the infusion  of individual-typological features on the performance efficiency. It is reflected in science through some native and foreign scientific glances, so that they can be understood together. It is designated the main warehouse individual-typological features day and the efficiency of the activity inflow is given. The preliminaries relevance is amortized by the rapid pace development and life rhythm and the significant information  technologies dynamism. It is the reason why people think of the human dignity of guilt of the species, mostly is very effective. The object of investigation is the interchange of individual-typological features and efficiency of professional performance. The subject of this work is an individual-typological specialty. The aim of the article is an analysis of current of native and foreign scientists’ works, directed to the efficiency specialties development. It is also the designation and storage of such individual-typological features as temperament, character and health, as well as the perspectives for the future. The environment is attributed to an understanding of an individual people’s style, who, behind their dynamic features, appeal to the individual temperament. The area of praxeology has been developed, as it has taken the openness of efficiency in other spheres of activity. The understanding of efficiency is seen as the main warehouse assessment of the professional performance success. It is presented the value of the efficiency and the complex characteristics of professional performance, which is rotated in the most significant indicators and determined by the integral people powers as a special feature. It is summarized that the effectiveness of the specialty in professional activity is rich, consequently it is determined by the individual-typological features variety appeared in temperament, character, health, and professionalism. The investigating perspective in this direction is to carry out an empirical research of the individual-typological features influence on the efficiency of performance.

Synchronization of Multiple Mechanical Oscillators Under Noisy Measurements Signals and Mismatch Parameters

2018 ◽  
Vol 19 (7-8) ◽  
pp. 699-707
Author(s):  
Ricardo Aguilar-López ◽  
Juan L. Mata-Machuca ◽  
Rafael Martínez-Guerra ◽  
Claudia A. Pérez-Pinacho
Keyword(s):  
Numerical Simulations ◽  
Additive Noise ◽  
Feedback Controller ◽  
Mechanical Oscillator ◽  
Hyperbolic Tangent ◽  
Hyperbolic Tangent Function ◽  
Control Scheme ◽  
Tangent Function ◽  
Mechanical Oscillators ◽  
Noisy Measurements

Abstract In this article, we present a control scheme to synchronize multiple mechanical oscillators under the master–slave configuration. The proposed scheme is applied in the synchronization of several mechanical oscillators with high nonlinear spring, where four mechanical oscillators are controlled in order to be in state of synchronization with the master mechanical oscillator against additive noise in the measurement signals and mismatch parameters. The proposed control consists of an external feedback controller with a class of hyperbolic tangent function, which gives us the possibility to overcome problems as noise in the measured output and parameter’s mismatch which is important due to the kind of control. The effectiveness of this control scheme is showed via numerical simulations with and without sustained disturbances.

A Fully Compliant Force Balanced Oscillator

2016 ◽  
Author(s):  
Sybren L. Weeke ◽  
Nima Tolou ◽  
Guy Semon ◽  
Just L. Herder
Keyword(s):  
Large Scale ◽  
Center Of Mass ◽  
Low Frequency ◽  
Inertial Forces ◽  
Ambient Vibrations ◽  
Mechanical Oscillator ◽  
Single Piece ◽  
Prismatic Joints ◽  
Reliable Performance ◽  
Mechanical Oscillators

Usage of compliant micro mechanical oscillators has increased in recent years, due to their reliable performance despite the growing demand for miniaturization. However, ambient vibrations affect the momentum of the oscillator, causing inaccuracy, malfunction or even failure of these devices. herefore, this paper presents a compliant force balanced mechanism comprising at least a prismatic joint, thereby creating the opportunity for usage of prismatic oscillators in translational accelerating environments. The proposed mechanism entails the symmetric displacement of two coplanar prismatic joints along non-collinear axes via a shape optimized linkage system. Rigid-body replacement with shape optimized X-bob, Q-LITF and LITF joints yielded a harmonic (R>0.999), low frequency (f = 27 Hz) single piece force balanced micro mechanical oscillator (∅35 mm). Experimental evaluation of large scale prototypes showed a limited ratio of the center of mass compared to the stroke of the device (≈0.01) and proper decoupling of the mechanism from the base, as the oscillating frequency of the balanced devices during ambient disturbances was unaffected, whereas unbalanced devices had frequency deviations up to 1.6%. Moreover, the balanced device reduced the resultant inertial forces transmitted to the base by 95%.

scholarly journals Air Motion in a Four-Stroke Direct Injection Diesel Engine

1974 ◽  
Vol 188 (1) ◽  
pp. 269-280 ◽  
Author(s):  
J. C. Dent ◽  
J. A. Derham
Keyword(s):  
Diesel Engine ◽  
Theoretical Analysis ◽  
Radial Flow ◽  
Direct Injection ◽  
Radial Component ◽  
Swirl Flow ◽  
Direct Injection Diesel Engine ◽  
The Mean ◽  
Air Motion ◽  
Good Agreement

This paper presents the results of a study of the air motion in a motored four-stroke direct injection diesel engine using hot-wire anemometry. The effects of engine speed, valve masking and supercharging on mean air swirl have been studied. A theoretical analysis is developed for the mean air swirl which in general shows good agreement with the experiments reported here and with the measurements of other workers on similarly sized engines. The problem of ‘squish’ has been investigated and it is shown to be the radial component of the spiralling swirl flow entering the combustion chamber. Reasonable agreement has been found between measurement of the radial flow component at the edge of the combustion bowl and a theoretical analysis that considers the bulk radial flow of air to the combustion bowl during the last 30°-40° b.t.d.c. of the compression period.

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