A Theory for the Identification of a Single Degree-of-Freedom Machine From its Periodic Operating Characteristics

1983 ◽  
Vol 105 (3) ◽  
pp. 445-451 ◽  
Author(s):  
J. L. Wiederrich
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Dynamic Analysis ◽  
Dynamic Properties ◽  
Degree Of Freedom ◽  
Operating Characteristics ◽  
Energy Potential ◽  
Single Degree Of Freedom ◽  
Single Degree

The dynamic properties of a machine are defined by its kinetic energy, potential energy, and dissipation functions. These functions form the basis for the dynamic analysis of a machine. This paper presents a theory whereby these functions may be determined from the observed forced periodic operating response of a single degree of freedom machine. This method may have applications in machinery development and diagnosis.

scholarly journals An approach to quantify the influence of ground motion uncertainty on elastoplastic system acceleration in incremental dynamic analysis

2017 ◽  
Vol 20 (11) ◽  
pp. 1744-1756 ◽  
Author(s):  
Peng Deng ◽  
Shiling Pei ◽  
John W. van de Lindt ◽  
Hongyan Liu ◽  
Chao Zhang
Keyword(s):  
Dynamic Analysis ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Structural Response ◽  
Incremental Dynamic Analysis ◽  
Degree Of Freedom ◽  
Maximum Acceleration ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Performance Based Earthquake Engineering

Inclusion of ground motion–induced uncertainty in structural response evaluation is an essential component for performance-based earthquake engineering. In current practice, ground motion uncertainty is often represented in performance-based earthquake engineering analysis empirically through the use of one or more ground motion suites. How to quantitatively characterize ground motion–induced structural response uncertainty propagation at different seismic hazard levels has not been thoroughly studied to date. In this study, a procedure to quantify the influence of ground motion uncertainty on elastoplastic single-degree-of-freedom acceleration responses in an incremental dynamic analysis is proposed. By modeling the shape of the incremental dynamic analysis curves, the formula to calculate uncertainty in maximum acceleration responses of linear systems and elastoplastic single-degree-of-freedom systems is constructed. This closed-form calculation provided a quantitative way to establish statistical equivalency for different ground motion suites with regard to acceleration response in these simple systems. This equivalence was validated through a numerical experiment, in which an equivalent ground motion suite for an existing ground motion suite was constructed and shown to yield statistically similar acceleration responses to that of the existing ground motion suite at all intensity levels.

Dynamic analysis of single-degree-of-freedom systems (DYANAS): A graphical user interface for OpenSees

2018 ◽  
Vol 177 ◽  
pp. 395-408 ◽  
Author(s):  
Georgios Baltzopoulos ◽  
Roberto Baraschino ◽  
Iunio Iervolino ◽  
Dimitrios Vamvatsikos
Keyword(s):  
User Interface ◽  
Dynamic Analysis ◽  
Graphical User Interface ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree

scholarly journals Required Time Gap Between Mainshock and Aftershock for Dynamic Analysis of Structures

2021 ◽  
Author(s):  
Roohollah M. Pirooz ◽  
Soheila Habashi ◽  
Ali Massumi
Keyword(s):  
Dynamic Analysis ◽  
Ground Motion ◽  
Strong Motion ◽  
Degree Of Freedom ◽  
Vibration Period ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Rest Time ◽  
Time Gap ◽  
Earthquake Sequences

Abstract Despite the various studies carried out to evaluate the effects of seismic sequences on structures, the matter of the time gap required to be considered between the mainshock and its corresponding aftershocks in dynamic analyses has never been focused on directly. This subtle but in the meantime effective subject, influences on the amount of accumulated damage caused by earthquake sequences. In the present study, 244 near fault ground motion components from 122 earthquakes were applied to a wide variety of single degree of freedom systems having vibrating period of 0.05 to 7 seconds with linear and nonlinear behavior. Furthermore, 2 planar steel moment-resisting frames, having 3 and 12 stories, were subjected to a set of 30 ground motion components. The purpose of this investigation was to estimate the required time for the structures to cease the free vibration at the end of the mainshock. The main purpose is to generate an estimation that is function of structural system’s parameters and the strong motion duration. Excellent correlations were obtained between the rest time and the following parameters: the combination of natural period of single degree of freedom systems, as well as the strong motion duration of earthquake sequences. In consequence, a formula is proposed which estimates the required optimized rest-time of a structure based on natural vibration period, as well as the duration of strong motion. Additionally, results obtained from the dynamic analysis of the steel frames validate the rest-time values achieved from the proposed formula.

scholarly journals Dynamic Response of RC Cantilever Beam by Equivalent Single Degree of Freedom Method on Elastic Analysis – A Review on Transformation Factors and Dynamic Magnification Factors

2018 ◽  
Vol 159 ◽  
pp. 01005
Author(s):  
Sri Tudjono ◽  
Patria Kusumaningrum
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Cantilever Beam ◽  
Mode Shape ◽  
Degree Of Freedom ◽  
Elastic Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Magnification Factors ◽  
Method Analysis

The response of multi-degree-of-freedom (MDOF) structure can be correlated to the response of an equivalent single-degree-of-freedom (SDOF) system, implying that the response is controlled by a single, unchanged mode shape. This equivalent SDOF method is eminent as an approximate method of dynamic analysis. In this study, equivalent SDOF method analysis is carried out on RC cantilever beam subjected to dynamic blast loading to review the transformation factors (TFs) provided by TM5-1300 code.

Kinematics and Dynamics Analysis of the Lifting System of a Welding and Tube-Transferring Car for Deepwater Pipe-Laying Vessels

2011 ◽  
Vol 199-200 ◽  
pp. 32-40
Author(s):  
Yi Lai Ma ◽  
Li Lin ◽  
Xian Wen Liu
Keyword(s):  
Dynamic Analysis ◽  
Reaction Force ◽  
Degree Of Freedom ◽  
Kinematics And Dynamics ◽  
Dynamics Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Support Reaction ◽  
Lifting System ◽  
Selection Of

The tube-transferring car is a key part of transportation system for deepwater pipe-laying vessels. This paper covers the design of a tube-transferring car for deep sea pipe-laying, especially its lifting mechanism. Kinematics and dynamics analysis of the lifting mechanism is conducted. During dynamic analysis and calculation, the single degree of freedom mechanical system dynamic analysis method is used. The results show that the rotation angle of the lifting system has a direct impact on the lifting speed and driving force. The support reaction force in each kinematic pair which is calculated by choosing the single degree of freedom dynamics provides a theoretical basis for the design of the lifting mechanism, which is finally reflected in the selection of horizontal drive of the feeding machine and the related parameter design．

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