scholarly journals METHODOLOGY FOR THE DYNAMIC ANALYSIS OF BUILDINGS SUBJECTED TO SEISMIC ACTIONS: INCORPORATING THE EFFECT OF NON-STRUCTURAL ELEMENTS

2017 ◽  
Author(s):  
MA CARMEN GARCÍA PASTOR ◽  
AMAYA GÓMEZ YÁBAR
Keyword(s):  
Dynamic Analysis ◽  
Structural Elements

On Application of Theory of Distributions to Static and Dynamic Analysis of Cracked Beams

2016 ◽  
Vol 16 (10) ◽  
pp. 1550073 ◽  
Author(s):  
Ricardo Oscar Grossi ◽  
Javier Leandro Raffo
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Numerical Results ◽  
Structural Elements ◽  
Computationally Efficient ◽  
Static And Dynamic Analysis ◽  
Rigorous Framework ◽  
Rigorous Study ◽  
Vibration Problems ◽  
Derivatives Of

This paper presents a rigorous study on the static and dynamic behavior of beams affected by cracks. The theory of distributions developed by Laurent Schwartz is adopted as it is particularly suitable for the treatment of discontinuities in functions for the deflection and derivatives of the beam. Thus, this paper presents a contribution towards the understanding and application of the theory of distributions to the static and dynamic behavior of structural elements affected by cracks. A simple, computationally efficient and accurate algorithm is developed for the problems of concern. Numerical results are presented for beams with two cracks. The algorithms developed for beams with discontinuities are obtained in a rigorous framework for static and vibration problems.

Structural and Dynamic Behavior of Pretwisted Rods and Beams

1991 ◽  
Vol 44 (12) ◽  
pp. 483-515 ◽  
Author(s):  
Aviv Rosen
Keyword(s):  
Composite Materials ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Static Analysis ◽  
High Temperatures ◽  
The Other ◽  
Present Review ◽  
Structural Elements ◽  
Coupling Effects ◽  
Very High

Because of being important structural elements in many engineering applications on one hand, and presenting inherent complicated coupling effects on the other hand, pretwisted rods have attracted the interest of many researchers. During the years, as a result of engineering breakthroughs, like the introduction of composite materials or operating at very high temperatures, the problems associated with pretwisted rods became more complicated. The present review will present the research during the last fifty years. It will be divided into three main subjects: static analysis, dynamic analysis and stability problems. The review will concentrate on the structural and dynamic aspects of pretwisted rods. Derivations of models and solution techniques will be addressed.

Simulation and Control Synthesis of Manipulator in Assembling Technical Parts

1979 ◽  
Vol 101 (4) ◽  
pp. 332-338 ◽  
Author(s):  
D. Stokic´ ◽  
M. Vukobratovic´
Keyword(s):  
Dynamic Analysis ◽  
Process Simulation ◽  
Control Synthesis ◽  
Structural Elements ◽  
Contact Points ◽  
Simulation And Control ◽  
External Forces ◽  
And Control ◽  
Insertion Process ◽  
Manipulator Control

The problem of simulation and synthesis of manipulator control in the phase of joining the structural elements and subassemblies is considered in this paper. Special attention has been devoted to the complete dynamic analysis of the ensemble: manipulator – working object and external forces in the process of assembling the elements. Results of the insertion process simulation with and without feedback with respect to the forces in contact points between the working object and environment are presented.

scholarly journals Research Concerning the Optimization of the Mechanism of the Conventional Sucker Rod Pumping Units

2019 ◽  
Vol 70 (5) ◽  
pp. 1795-1799
Author(s):  
Georgeta Toma
Keyword(s):  
Dynamic Analysis ◽  
Operating Parameters ◽  
Optimal Solutions ◽  
Structural Elements ◽  
Sucker Rod ◽  
Pumping Unit ◽  
Pumping Equipment ◽  
Pumping Units

Finding optimal solutions to design the mechanism of the conventional sucker rod pumping units is always present due to many problems that involve. The study in this case involves both the cinematic and dynamic analysis of the mechanism of the conventional pumping units, making sure that the optimization solution maintain unchanged certain operating parameters of the pumping equipment such as the stroke of the sucker rod column. In the paper is presented a method of determining the optimal dimensions of the structural elements of the mechanism of the conventional pumping units in order to reduce the maximum values of the connection forces in the bearings in the conditions of maintaining unchanged the stroke of the sucker rod column. The simulations have been performed in the case of a C-640D-305-120 pumping unit.

scholarly journals Analysis of vibration status of power generating unit reducers

2019 ◽  
Vol 2019 (4) ◽  
pp. 96-106
Author(s):  
Вадим Пшеничный ◽  
Vadim Pshenichnyy ◽  
Алексей Сальников ◽  
Alexey Salnikov
Keyword(s):  
Dynamic Analysis ◽  
High Speed ◽  
Operation Mode ◽  
Technical Condition ◽  
Vibration Measurement ◽  
Structural Elements ◽  
Bending Vibrations ◽  
Dynamic Interactions ◽  
Low Speed ◽  
Power Generating Unit

The reducers of power units are being studied. Dynamic analysis of the basic structural elements of reducers has been carried out. There have been found the possible causes of the increased wear of surfaces of toothed linkages of herringbone transfer. There are given the results of studying dynamic interactions by vibration characteristics of measuring the vibration level in bearing blocks and elements of reducers of power units at their technological operation mode. To analyze the frequency interaction of structural elements of the studied reducers there were used the results of modal analysis of earlier conducted researches of the reducer power unit. It has been stated that for conducting vibrodiagnostic control the third class machines were chosen due to their powerful primary engines, and other machines with rotating masses mounted on massive foundations, rigid in the direction of vibration measurement. Phase angles of high-speed and low-speed shaft wheels for the purpose of defining a corner of phase shift (torsional fluctuations of shaft wheels) at reverse frequencies and frequencies of toothed linkage have been studied. In terms of dynamic analysis it allows to trace trajectories of linkages in toothed couples of divided wheels of herringbone gearing. The diagrams of gear trajectories are illustrated for bending vibrations of the shaft-wheels. The research results confirming the nonlinear relationship between the level of axial vibrations and the displacement angle of instantaneous phase angle are presented. It has been recommended to reduce the level of axial vibration transmitted from the coupling to 0.1–0.2 mm/s for eliminating uneven wear in the chevron gear; carry out structural improvements to the high-speed and low-speed shaft-wheels with increasing rigidity between the elements of chevron transmission; operate gearboxes within critical values; timely monitor the technical condition of gearboxes.

Structure Analysis Loaded by Interior Blast Effect

2014 ◽  
Vol 617 ◽  
pp. 86-91
Author(s):  
Daniel Makovička ◽  
Daniel Makovička
Keyword(s):  
Stress State ◽  
Dynamic Response ◽  
Dynamic Analysis ◽  
Static Analysis ◽  
Structure Analysis ◽  
Detailed Calculation ◽  
Building Structure ◽  
Structural Elements ◽  
Blast Effect ◽  
Limit Stress

The paper determines the parameters of the explosion wave excited by a terrorist charge and assumption of the building structure of a railway station based on dynamic analysis. Certain simplified methods according to various publications, according to our own experimental results and according to 3D computations based on detailed calculation modelling of the interior of the room are compared to determine the explosive effects. Equivalent static analysis was applied to the dynamic response of the structural elements of the selected room. The damage caused to these structural elements is weighted on the basis of the angle of failure of the central axis / surface, and on the basis of the limit stress state of these structures.

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