scholarly journals Research on MRD Parametric Model Based on Magic Formula

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Wei Pan ◽  
Zhengtao Yan ◽  
Jingjun Lou ◽  
Shijian Zhu
Keyword(s):  
Experimental Data ◽  
Working Conditions ◽  
Parametric Model ◽  
Parametric Modelling ◽  
Loop Model ◽  
Magnetorheological Dampers ◽  
Nonlinear Characteristics ◽  
Magic Formula ◽  
Parameterized Model ◽  
General Method

In order to get a better description to the nonlinear characteristics of magnetorheological dampers, the magic formula is introduced into the general method of parametric modelling of magnetorheological dampers to propose a new parameterized model called magic formula-hysteresis loop model (MFM). The new model is simple in structure, the physical meaning of each parameter is clear, and the parameter identification is convenient. The fitting and experimental data of MFM and the phenomenon model under different conditions are applied for error analysis and comparison. The results show that the errors of MFM are more accurate and have better fitting and experimental data under different working conditions, which also have better adaptability and versatility.

On the Theory of the Calculation of the Constant Velocity Ball Transmission Joints

1976 ◽  
Vol 98 (3) ◽  
pp. 852-857 ◽  
Author(s):  
N. Bellomo
Keyword(s):  
Working Conditions ◽  
Load Distribution ◽  
Constant Velocity ◽  
Numerical Calculations ◽  
Torque Capacity ◽  
Safe Working ◽  
General Method

In this work a general method for the calculation of constant velocity ball transmission joint with straight grooves is studied. Numerical calculations concerning the forces transmitted by each driving ball and the torque capacity have been realized with reference to known and manufactured types of joint. The study allows one to deduce some important and experimentally confirmed designing rules and gives a precise picture of the load distribution in the joint as well as the limits of safe working conditions.

Model Verification of Mixed Dynamic Systems

1978 ◽  
Vol 100 (2) ◽  
pp. 266-273 ◽  
Author(s):  
J. D. Chrostowski ◽  
D. A. Evensen ◽  
T. K. Hasselman
Keyword(s):  
Experimental Data ◽  
Parameter Estimation ◽  
Dynamic Systems ◽  
Statistical Parameter ◽  
Model Verification ◽  
Passive Networks ◽  
Parameter Values ◽  
Basic Configuration ◽  
General Method

A general method is presented for using experimental data to verify math models of “mixed” dynamic systems. The term “mixed” is used to suggest applicability to combined systems which may include interactive mechanical, hydraulic, electrical, and conceivably other types of components. Automatic matrix generating procedures are employed to facilitate the modeling of passive networks (e.g., hydraulic, electrical). These procedures are augmented by direct matrix input which can be used to complement the network model. The problem of model verification is treated in two parts; verification of the basic configuration of the model and determination of the parameter values associated with that configuration are addressed sequentially. Statistical parameter estimation is employed to identify selected parameter values, recognizing varying degrees of uncertainty with regard to both experimental data and analytical results. An example problem, involving a coupled hydraulic-mechanical system, is included to demonstrate application of the method.

A novel parametric model for magnetorheological dampers considering excitation characteristics

2020 ◽  
Vol 29 (4) ◽  
pp. 045002 ◽  
Author(s):  
Ming Cheng ◽  
Zhaobo Chen ◽  
Wentao Liu ◽  
Yinghou Jiao
Keyword(s):  
Parametric Model ◽  
Magnetorheological Dampers

Three Edged Drill vs. Double - Edged Drill in Aluminium Parts Drilling

2014 ◽  
Vol 1036 ◽  
pp. 382-387
Author(s):  
Eugen Pămîntaş ◽  
Cristian Gheorghe Turc ◽  
Felicia Veronica Banciu
Keyword(s):  
Experimental Data ◽  
Working Conditions ◽  
Performance Indicators ◽  
Experimental Program ◽  
Concrete Case ◽  
Drilling Tool ◽  
Industrial Practice ◽  
Industrial Environment ◽  
High Degree

This paper proposes an answer to a question like "it is better to use something new or use what we already know is a relatively recent technique novelty, which is found in tools manufacturer’s catalogues but still very rarely used, almost unknown in current industrial practice: spiral drill with three cutting edges. To give an endorsed answer, it starts machining a concrete case of a part of aluminium and research, based on a minimal experimental program, the processing with new drilling tool compared with the known helical drill. Answer the question initially is not simple, nor one given in few words and none with the high degree of generality, but one nuanced, depending on the performance indicators considered to be of interest and closeness of experimental working conditions than those found in current industrial environment. Helpful for the formulation and presenting the response is the processing of experimental data in the form of calculations, graphs and summary of the rejection’s causes. In this way, the concluding elements stand out more obvious and a number of partial answers can be formulated and justified recommendations can be done regarding: which of drills, where and in which conditions provides the best quality of machined hole, the best chip fragmentation and with the best ratio: price / quality / operation.

Flow Stress Equations for Type 304 Stainless and AISI 1055 Steels

1985 ◽  
Vol 107 (2) ◽  
pp. 97-100 ◽  
Author(s):  
P. Dadras
Keyword(s):  
Experimental Data ◽  
Stainless Steel ◽  
Flow Stress ◽  
Strain Rate ◽  
Working Conditions ◽  
Hot Working ◽  
304 Stainless Steel ◽  
Strain Behavior ◽  
Type 304 ◽  
Type 304 Stainless Steel

A model for stress-strain behavior under hot working conditions has been proposed. Based on experimental data, equations for the dependence of flow stress on strain, strain rate, and temperature have been developed. Application to type 304 stainless steel and AISI 1055 steel has been demonstrated.

scholarly journals Ratcheting response of biological tissues over asymmetric loading cycles

2021 ◽  
Author(s):  
Mahboubeh Sadat Hashemi
Keyword(s):  
Experimental Data ◽  
Strain Curve ◽  
Biological Tissues ◽  
Parametric Model ◽  
Stress Strain Curve ◽  
Stress Variation ◽  
Ratcheting Strain ◽  
Asymmetric Loading ◽  
Model Predictions ◽  
Failure Region

The purpose of this study is to examine the ratcheting phenomenon in a variety of biological tissues including the trabecular bone, meniscus, articular cartilage and skin, and propose a parametric model to predict the ratcheting strain of these tissues. Furthermore, utilizing experimental data, and the influence of different mechanical and biological parameters on the ratcheting strain are discussed. The dependency of ratcheting on frequency, stress rate, stress variation, physiological environment, and tissue sites is demonstrated. Besides, stiffness of the toe and linear regions in each cycle, and the modulus of the failure region of the stress-strain curve are computed. The energy dissipation in different cycles at two frequencies of 1 Hz and 10 Hz is discussed. A parametric model was employed to predict ratcheting behavior of the said biological tissues. The model predictions of the strain accumulation in tissues are found in agreement with the experimental data.

scholarly journals On Alternative Methods of Determining Radius of Curvature Using Newton’s Rings Set up

2015 ◽  
Vol 48 ◽  
pp. 27-31 ◽  
Author(s):  
K.H. Raveesha ◽  
Kamal Kumar ◽  
B.K. Prasad
Keyword(s):  
Experimental Data ◽  
Alternative Methods ◽  
Radius Of Curvature ◽  
Convex Lens ◽  
Interference Fringes ◽  
Set Up ◽  
Air Film ◽  
General Method

It well known that radius of curvature of a plano convex lens can be determined using Newton’s Rings set up making use of Interference by division of amplitude principle. The general method widely used involves measurement of diameter of several circular dark fringes. We propose two alternative methods involving different formulae. It is based on the fact that, the formation of bright and dark interference fringes is a measure of the thickness of the air film at that point. The methods use simpler geometry and the formulae are easier to derive. We present the experimental data. The results from the experiment are in agreement with results obtained through the general method.

Measuring and Analyzing the Moment of Friction in Double-Row Ball Bearings

2013 ◽  
Vol 199 ◽  
pp. 149-154
Author(s):  
Robert Korbut ◽  
Jerzy Nachimowicz
Keyword(s):  
Experimental Data ◽  
Working Conditions ◽  
Ball Bearing ◽  
Ball Bearings ◽  
Double Row ◽  
The Moment ◽  
Working Resistance ◽  
The Given

On the basis of the experiment, the changes in the moment of friction in the double-row ball bearing were estimated. The experimental data indicated the presence of significant differences between the average values of the moment of friction in the whole spectrum of the rotational speeds that were examined. At the same time it was observed that there exist certain characteristic rotational speeds at which the given bearing is informed by a greater working resistance. It may indicate the presence of both optimal and unfavourable working conditions for these bearings; the conditions during which there occur minimal or, respectively, maximal resistances (in a given situation). The results of the examination were analyzed statistically; the after-examination samples were closely observed and this further visual scrutiny proved that during the work of the bearing, the lubricant was displaced.

A General Method for Data Averaging of Anisotropic Elastic Constants

1993 ◽  
Vol 60 (3) ◽  
pp. 614-618 ◽  
Author(s):  
M. Gre´diac ◽  
A. Vautrin ◽  
G. Verchery
Keyword(s):  
Experimental Data ◽  
Elastic Constants ◽  
Bending Tests ◽  
Compliance Tensor ◽  
Best Value ◽  
Anisotropic Elastic ◽  
Experimental Scatter ◽  
General Method

Redundant experimental data are usually required to determine the best value for the whole set of compliances of an anisotropic laminate. A method is presented here to optimize the compliance tensor values using the five invariants of fourth-rank compliance tensors. A vectorial representation of those invariants is given. It provides a compact presentation of the data and reveals the experimental scatter. Experimental data obtained with bending tests on plates are used as an example to optimize the flexural compliance tensor of a laminate and to show the relevance of the method in practice.

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