The influence of time derivative terms on the mechanical behaviour of loose sands

2000 ◽  
pp. 303-318
Author(s):  
C. di Prisco ◽  
S. Imposimato
Keyword(s):  
Mechanical Behaviour ◽  
Time Derivative

Modeling of mechanical behaviour of HSLA low carbon bainitic steel thermomechanically processed

2003 ◽  
Vol 112 ◽  
pp. 449-452
Author(s):  
D. B. Santos ◽  
P. C.M. Rodrigues ◽  
A. B. Cota
Keyword(s):  
Mechanical Behaviour ◽  
Bainitic Steel ◽  
Low Carbon

Optimized control over modes of hydraulic percussion cutting heads of mining machines

2020 ◽  
pp. 95-104
Author(s):  
Yu. M. Smirnov ◽  
B. M. Kenzhin ◽  
N. S. Smakova ◽  
M. A. Zhurunova
Keyword(s):  
Time Derivative ◽  
Operating Conditions ◽  
Control Action ◽  
Main Function ◽  
Output Data ◽  
Working Cycle ◽  
Control Units ◽  
Action Change ◽  
Function Element ◽  
Service Factors

The main cause of the disagreement between the actual and calculated output data of hydraulic percussion mining machines is the erroneous feed of manipulation signals by the control units. For the maximal fitting of the calculated and actual figures, the continuous method of control action using the third time derivative of the law of motion of the main function element is accepted, namely, the accuracy. The mathematical models of control using displacement, velocity and acceleration are developed. The service factors of mining machines are found. Based on the theory of control and the mathematical logic theory, the logical circuits of formation of manipulation signals in each phase of the working cycle are developed. The main elements are converters, integrators and accumulators ensuring decomposition of elements of the logical circuits and further generation of appropriate control action. It is found that the simplest way is to generate the control action for acceleration of the key function element. For the developed circuits, it is recommended to use general charts of the control action change, implementable for a certain design of hydraulic percussion cutting heads in certain operating conditions.

MATHEMATICAL MODELLING OF MECHANICAL BEHAVIOUR OF CELLULOSE-BASED FIBRES EXPOSED TO GAMMA RAYS AND HYDROTHERMAL TREATMENT

2015 ◽  
Vol 14 (3) ◽  
pp. 601-605 ◽  
Author(s):  
Cristina M. Ursescu ◽  
Angelica Olaru ◽  
Teodor Malutan. ◽  
Maria Geba ◽  
Corina Malutan
Keyword(s):  
Mathematical Modelling ◽  
Hydrothermal Treatment ◽  
Gamma Rays ◽  
Mechanical Behaviour

Concrete mechanical behaviour and calcium leaching weak coupling

2006 ◽  
Vol 10 (9) ◽  
pp. 1147-1175 ◽  
Author(s):  
Laurie Lacarrièrre ◽  
Alain Sellier ◽  
Xavier Bourbon
Keyword(s):  
Mechanical Behaviour ◽  
Weak Coupling ◽  
Calcium Leaching
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