Bounding Solutions for Performance of Vibratory Plows

1974 ◽  
Vol 96 (3) ◽  
pp. 954-959
Author(s):  
L. J. Scerbo ◽  
D. L. Pope
Keyword(s):  
Velocity Vector ◽  
Constant Amplitude ◽  
System Parameters ◽  
Soil Model ◽  
Simple Equations ◽  
Two Parameter

This paper discusses the reduction in the applied drawbar force required to penetrate soil with vibrating plows. Harmonically forced linear and orbital motions of a plow blade are investigated. A rigid blade, vibrating with constant amplitude and a two-parameter soil model is used to represent the system. The assumption that the soil force opposes the instantaneous blade velocity vector is sufficient to describe the soil-blade interaction. Bounding solutions, which relate applied drawbar force to average plowing speed and other system parameters, are obtained as simple equations. These equations put into perspective the relative merits of each of these vibratory motions.

scholarly journals Principal Features of Fatigue and Residual Strength of Composite Materials Subjected to Constant Amplitude (CA) Loading

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2586 ◽  
Author(s):  
Alberto D’Amore ◽  
Luigi Grassia
Keyword(s):  
Experimental Data ◽  
Residual Strength ◽  
Stress Ratio ◽  
Cyclic Stress ◽  
Constant Amplitude ◽  
General Validity ◽  
Robust Test ◽  
Sudden Drop ◽  
Stochastic Nature ◽  
Two Parameter

This paper summarizes the principal features of composites’ responses when subjected to constant amplitude (CA) cyclic loadings. The stochastic nature of the responses; the absence of a detectable fatigue limit; the sudden drop of strength; the general validity of the strength-life equal-rank assumption (SLERA); and, ultimately, the residual strength-life equal-rank assumption (RSLERA) are discussed on the basis of the selected experimental data available in literature. The objective is defining a robust test in order to ascertain the reliability of the phenomenological models. A two-parameter phenomenological model accounting for the maximum cyclic stress, σmax, and the stress ratio, R = σmin/σmax, was used for guidance through the phenomenology of fatigue. It is concluded that the robustness of the models dealing with fatigue can be checked only when the characteristics of the composites’ responses are described simultaneously with fixed parameters.

A Simulator Study of a Two-Parameter Adaptive System

SIMULATION ◽  
1964 ◽  
Vol 3 (1) ◽  
pp. 45-54 ◽  
Author(s):  
R.J. McGrath ◽  
V.C. Rideout
Keyword(s):  
Mean Square Error ◽  
Adaptive System ◽  
Order System ◽  
Mean Square ◽  
Parameter Perturbation ◽  
Third Order ◽  
System Parameters ◽  
The Mean ◽  
Two Parameter ◽  
Param Eters

The use of sinusoidal parameter perturbation applied to a feedback control system to obtain an adaptive scheme which optimizes the system for changes in inputs and/or system parameters is discussed. It is shown that if a parameter perturbation signal is cross- correlated with the system error squared, the corre lator output can be used to adjust the parameter to minimize the mean-square error. Other error meas ures may also be used. Two or more parameters may be simultaneously adjusted, if they are perturbed at different frequencies and each is provided with an independent adaptive loop. A computer simulation of a third-order system having two adjustable param eters was examined for a variety of inputs including random signals. It is shown that the scheme mini mizes the mean-square error in all cases.

Evaluation of Soil Coefficients for Two-Parameter Subgrade Soil Model Based on Rigid Plate Loading Tests

2020 ◽  
Vol 44 (3) ◽  
pp. 20190150
Author(s):  
Wang-Xi Zhang ◽  
Rui Liu ◽  
Xuan-Xun Yuan ◽  
Hyeon-Jong Hwang ◽  
Wei-Jian Yi
Keyword(s):  
Rigid Plate ◽  
Model Based ◽  
Soil Model ◽  
Subgrade Soil ◽  
Loading Tests ◽  
Plate Loading ◽  
Two Parameter

scholarly journals Decision support model for perishable items impacting ramp type demand in a discounted retail supply chain environment

2018 ◽  
Vol 28 (3) ◽  
pp. 371-383
Author(s):  
P.K. Tripathy ◽  
Sujata Sukla
Keyword(s):  
Decision Support Model ◽  
Single Item ◽  
Perishable Items ◽  
System Parameters ◽  
Starting Time ◽  
Eoq Model ◽  
Demand Rate ◽  
Time Periods ◽  
Ramp Type Demand ◽  
Two Parameter

A single item EOQ model has been developed considering demand as a two parameter ramp type function and deterioration as a Heaviside's function. Both pre and post deterioration discounts are considered where the former helps in maintaining constancy in the demand rate and the latter one boosts the demand of decreased quality items. The starting time periods of pre and post deterioration discount have been determined. The effect of both types of discounts in optimising the profit is examined through numerical illustrations. Sensitivity analysis is also appended to find out the effect of various system parameters. From this study it is observed that it will be more advantageous for management to offer pre deterioration discount in enticing the profit.

Some results of the Barbier-Chalonge-Divan system of stellar classification

1966 ◽  
Vol 24 ◽  
pp. 77-90 ◽  
Author(s):  
D. Chalonge
Keyword(s):  
Early Type ◽  
Parameter System ◽  
Early Type Stars ◽  
Two Parameter

Several years ago a three-parameter system of stellar classification has been proposed (1, 2), for the early-type stars (O-G): it was an improvement on the two-parameter system described by Barbier and Chalonge (3).

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

Subjective Time Preference and Willingness to Pay for an Energy-Saving Durable Good

2001 ◽  
Vol 32 (3) ◽  
pp. 133-141 ◽  
Author(s):  
Gerrit Antonides ◽  
Sophia R. Wunderink
Keyword(s):  
Willingness To Pay ◽  
Energy Saving ◽  
Subjective Time ◽  
Durable Good ◽  
Discount Function ◽  
Hyperbolic Discount ◽  
The One ◽  
Two Parameter ◽  
Difference Effect ◽  
Better Than

Summary: Different shapes of individual subjective discount functions were compared using real measures of willingness to accept future monetary outcomes in an experiment. The two-parameter hyperbolic discount function described the data better than three alternative one-parameter discount functions. However, the hyperbolic discount functions did not explain the common difference effect better than the classical discount function. Discount functions were also estimated from survey data of Dutch households who reported their willingness to postpone positive and negative amounts. Future positive amounts were discounted more than future negative amounts and smaller amounts were discounted more than larger amounts. Furthermore, younger people discounted more than older people. Finally, discount functions were used in explaining consumers' willingness to pay for an energy-saving durable good. In this case, the two-parameter discount model could not be estimated and the one-parameter models did not differ significantly in explaining the data.

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