Dynamic analysis technique for bodies of forest motor roads

10.12737/2185 ◽  
2014 ◽  
Vol 3 (4) ◽  
pp. 89-93
Author(s):  
Михеевская ◽  
Marina Mikheevskaya ◽  
Сушков ◽  
Sergey Sushkov ◽  
Бурмистрова ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Dynamic Analysis ◽  
Tangential Stress ◽  
Analysis Technique ◽  
Defor Mation ◽  
Consolidation Time

The article describes a method of dynamic analysis of pavement bodies of timber road Ukhta – Troitsky-Pechorsk, a forecast of full sinkage and consolidation time of the subsoil. Reinforcing gravel with geogrids increases the overall (equivalent) elastic modulus of structure for 6…15 %, reduces the magnitude of the tangential stress in the layer, underlying the geogrid by 25…80 %, increases the modulus of defor-mation with significant precipitation more than in 2 times.

Dynamic Analysis of Long Floating Structures in Waves

2004 ◽  
Author(s):  
Eric Morris ◽  
Norman Allyn ◽  
Michael Isaacson
Keyword(s):  
Dynamic Analysis ◽  
Harmonic Wave ◽  
Superposition Principle ◽  
Wave Spectrum ◽  
Storm Event ◽  
Bending Moments ◽  
Floating Structures ◽  
Directional Wave Spectrum ◽  
Analysis Technique ◽  
Directional Wave

This paper describes a frequency domain dynamic analysis technique for calculating the response of long floating structures in waves. Due to the large dimensions of the structure, it is necessary to account for the correlation of wave forces along the structure length to accurately calculate the response. The sea surface is therefore modeled as short-crested and is described by a directional wave spectrum. The dynamic analysis technique uses a superposition principle in which the short-crested sea is composed of numerous harmonic wave components with different frequencies and directions of propagation and amplitudes calculated from the directional wave spectrum. Hydrodynamic coefficients are calculated using a 2-dimensional diffraction program. The structure is modeled using beam elements in the ANSYS finite element program and moorings are represented using spring elements. The response of the structure to each wave component is calculated in a series of harmonic analyses. Spectral analysis is used to calculate the variance of the responses in a given storm event. The responses of interest for a given exceedence probability are then determined. The covariance of the responses is calculated and coincident response combinations are produced based on the assumption that the responses have a multi-variate normal distribution. The magnitude of coincident responses is often of interest in structural design. For example, a member subject to bi-axial bending could be designed to have excess resistance if the maximum value of the orthogonal bending moments obtained from a dynamic analysis is used rather than the coincident bending moments.

scholarly journals Dynamic Analysis Technique of Rotating Centrifugal Impeller

1991 ◽  
Author(s):  
Jin Zhang ◽  
X. J. Chen ◽  
W. L. Wang
Keyword(s):  
Experimental Data ◽  
Dynamic Analysis ◽  
Natural Frequencies ◽  
Coupled System ◽  
Economic Benefits ◽  
Centrifugal Impeller ◽  
Stiffness Matrices ◽  
Analysis Technique ◽  
Reduced Coordinates ◽  
Made In

A dynamic analysis technique which can be employed in rotating centrifugal impeller is presented in this paper. It shows that multi–component partition can be made in repetitive sector region of the centrifugal impeller. The basic repectivie sector region of the centrifugal impeller is divided into three substructures: the full blade, the short blade and the sectorial part of the disc. By using Benfield mode substitution combined with group transformation successfully, the Hermite generalized mass and stiffness matrices under the reduced coordinates are derived. From this, the natural frequencies and the corresponding modal shapes of the bladed disc coupled system can be solved. The comparison of the analytical results obtained by using this method, other methods and the experimental data of models verifies the reliability, practicability and considerable economic benefits of the method presented in this paper.

scholarly journals HLola: a Very Functional Tool for Extensible Stream Runtime Verification

2021 ◽  
pp. 349-356
Author(s):  
Felipe Gorostiaga ◽  
César Sánchez
Keyword(s):  
Dynamic Analysis ◽  
Open Source ◽  
Ad Hoc ◽  
Runtime Verification ◽  
Data Types ◽  
Tool Chain ◽  
Stream Monitoring ◽  
Functional Aspects ◽  
Analysis Technique ◽  
Functional Features

AbstractWe present , an extensible Stream Runtime Verification (SRV) tool, that borrows from the functional language Haskell (1) rich types for data in events and verdicts; and (2) functional features for parametrization, libraries, high-order specification transformations, etc.SRV is a formal dynamic analysis technique that generalizes Runtime Verification (RV) algorithms from temporal logics like LTL to stream monitoring, allowing the computation of verdicts richer than Booleans (quantitative values and beyond). The keystone of SRV is the clean separation between temporal dependencies and data computations. However, in spite of this theoretical separation previous engines include hardwired implementations of just a few datatypes, requiring complex changes in the tool chain to incorporate new data types. Additionally, when previous tools implement features like parametrization these are implemented in an ad-hoc way. In contrast, is implemented as a Haskell embedded DSL, borrowing datatypes and functional aspects from Haskell, resulting in an extensible engine (The tool is available open-source at http://github.com/imdea-software/hlola). We illustrate through several examples, including a UAV monitoring infrastructure with predictive characteristics that has been validated in online runtime verification in real mission planning.

An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments

1992 ◽  
Vol 7 (6) ◽  
pp. 1564-1583 ◽  
Author(s):  
W.C. Oliver ◽  
G.M. Pharr
Keyword(s):  
Elastic Modulus ◽  
Peak Load ◽  
Soda Lime ◽  
Indentation Load ◽  
Fused Silica ◽  
Soda Lime Glass ◽  
Flat Punch ◽  
Analysis Technique ◽  
Load Displacement ◽  
Improved Technique

The indentation load-displacement behavior of six materials tested with a Berkovich indenter has been carefully documented to establish an improved method for determining hardness and elastic modulus from indentation load-displacement data. The materials included fused silica, soda–lime glass, and single crystals of aluminum, tungsten, quartz, and sapphire. It is shown that the load–displacement curves during unloading in these materials are not linear, even in the initial stages, thereby suggesting that the flat punch approximation used so often in the analysis of unloading data is not entirely adequate. An analysis technique is presented that accounts for the curvature in the unloading data and provides a physically justifiable procedure for determining the depth which should be used in conjunction with the indenter shape function to establish the contact area at peak load. The hardnesses and elastic moduli of the six materials are computed using the analysis procedure and compared with values determined by independent means to assess the accuracy of the method. The results show that with good technique, moduli can be measured to within 5%.

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