Dynamic Behavior of a Hydraulically Actuated Mechanism. Part 2: Nonlinear Character

1986 ◽  
Vol 108 (2) ◽  
pp. 250-254
Author(s):  
V. Venkatraman ◽  
R. W. Mayne
Keyword(s):  
Dynamic Response ◽  
Transient Response ◽  
Adequate Description ◽  
Linear Behavior ◽  
Transmission Angle ◽  
Dimensionless Groups ◽  
Hydraulically Actuated ◽  
Nonlinear Character ◽  
The Common ◽  
Nonlinear Nature

The first of these papers considering a hydraulically actuated mechanism presents the common oscillating cylinder arrangement and sets of equations which describe the dynamic system. It then defines dimensionless groups that characterize the actuator-mechanism and explores the quasi-linear behavior of the system. This present paper focuses on the nonlinear nature of the system. Effects of transmission angle, mechanism geometry and loading are considered as well as the range of operation in which the small perturbation behavior provides an adequate description of the dynamic response. The paper closes by identifying a new parameter which plays an important role in characterizing the dependence of the system transient response on mechanism geometry.

Non-Destructive Vibration Tests on Reinforced Concrete Structures

2015 ◽  
Vol 660 ◽  
pp. 186-191 ◽  
Author(s):  
Marina Lute
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Reinforced Concrete Beams ◽  
Reinforced Concrete Structures ◽  
Linear Behavior ◽  
Non Linear ◽  
Vibration Tests ◽  
Non Destructive

The purpose of this paper is looking at the dynamic response of existing reinforced concrete structures which have possibly sustained various levels of damage, a set of tests need to be identified that will be able to detect damage and quantify the damage if damage exists. In this work it is presented a further study on the effect of damage on the behavior of reinforced concrete beams. In particular, the non-linear behavior of these beams is considered once significant cracking has been introduced, outlining the stage of testing carried out in dynamic field.

Agent-Based Modeling

2017 ◽  
pp. 36-51
Keyword(s):  
Complex Adaptive Systems ◽  
Adaptive Systems ◽  
Complexity Science ◽  
Agent Based Modeling ◽  
Agent Based ◽  
Linear Behavior ◽  
Complex Adaptive ◽  
Economic Markets ◽  
The Common ◽  
Policy Problems

Agent based modeling is one of many tools, from the complexity sciences, available to investigate complex policy problems. Complexity science investigates the non-linear behavior of complex adaptive systems. Complex adaptive systems can be found across a broad spectrum of the natural and human created world. Examples of complex adaptive systems include various ecosystems, economic markets, immune response, and most importantly for this research, human social organization and competition / cooperation. The common thread among these types of systems is that they do not behave in a mechanistic way which has led to problems in utilizing traditional methods for studying them. Complex adaptive systems do not follow the Newtonian paradigm of systems that behave like a clock works whereby understanding the workings of each of the parts provides an understanding of the whole. By understanding the workings of the parts and a few external rules, predictions can be made about the behavior of the system as a whole under varying circumstances. Such systems are labeled deterministic (Zimmerman, Lindberg, & Plsek, 1998).

Research Progress on Wind-Resistant and Seismic Performance of Glass Curtain Wall Supported by Plane Cable Net

2014 ◽  
Vol 578-579 ◽  
pp. 790-794
Author(s):  
Ming Li ◽  
Yuan Qing Wang ◽  
Wei Tao ◽  
Bin Wang ◽  
Qing Xian Yu ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Seismic Performance ◽  
Seismic Design ◽  
Research Progress ◽  
Seismic Load ◽  
Curtain Wall ◽  
Main Structure ◽  
Geometrical Nonlinear ◽  
Nonlinear Character ◽  
Glass Curtain Wall

Glass curtain wall supported by plane cable net (PCNCW) is very popular in civil engineering for its advantages of beautiful appearance and good permeability etc. Because plane cable net (PCN) has the obvious geometrical nonlinear character and its dynamic response is affected by the main structure it attached to, it has to be considered particularly in wind-resistant and seismic design. In recent years, many research results have been achieved on wind-resistant and seismic performance of PCNCW, including the study on how to calculate the equivalent static wind and seismic load, how the factors influence the wind-resistant force behavior, discussion on seismic fortification criterion, and how it is influenced by the main structure under wind and seismic load. These results are overviewed and the problems needed to be further studied in the future is prospected.

Comparison of the dynamic response of two columns of milling machines made of standard carpentry and metal foam sandwiches

2015 ◽  
Vol 23 (17) ◽  
pp. 2782-2794 ◽  
Author(s):  
M Portentoso ◽  
P Pennacchi ◽  
S Chatterton
Keyword(s):  
Dynamic Response ◽  
Metal Foam ◽  
Experimental Tests ◽  
Wide Frequency Range ◽  
Linear Behavior ◽  
Modal Damping ◽  
Wide Range ◽  
Milling Machines ◽  
Foam Filled ◽  
Mechanical Performances

In this paper, a comparison between two different machine tool columns is presented. The two columns are realized with a different technology: classic metalworking versus metal foam sandwiches. The aim of the experimental tests is the evaluation of their different mechanical performances and characteristics, with a particular focus on the dynamic response and on the convenience to consider system damping as a key parameter. This kind of comparison is generally believed as difficult, because the foam-filled structures usually show not-linear behavior, which makes not applicable the usual experimental modal procedures. The comparison is carried out in terms of both modal analysis and wide frequency range excitation, as described in the paper. A new method is introduced by the authors to deem which technology is the more suitable, based on overall dynamic response in a wide range of frequency, rather than on modal damping.

scholarly journals Dynamic Response of Tapered Fluid Lines : 2nd Report, Transient Response

1986 ◽  
Vol 29 (257) ◽  
pp. 3725-3730 ◽  
Author(s):  
Takayoshi MUTO ◽  
Hirotaka KAYUKAWA
Keyword(s):  
Dynamic Response ◽  
Transient Response

Dynamic Behavior of a Hydraulically Actuated Mechanism. Part 1: Small Perturbations

1986 ◽  
Vol 108 (2) ◽  
pp. 245-249 ◽  
Author(s):  
V. Venkatraman ◽  
R. W. Mayne
Keyword(s):  
Dynamic Behavior ◽  
Transient Response ◽  
Hydraulic Cylinder ◽  
Design Guidelines ◽  
System Behavior ◽  
Small Perturbations ◽  
Wide Range ◽  
Hydraulically Actuated ◽  
Quantitative Design ◽  
Parameter Values

This paper considers the dynamic behavior of a mechanism actuated by an oscillating hydraulic cylinder. The analysis is generalized by introducing nondimensional parameters. In this first portion of the paper, linearization is applied to explore the basic nature of the system transient response. A wide range of parameter values is considered to illustrate the effects of fluid capacitance, fluid inertance, load, leakage and friction on the system behavior and quantitative design guidelines are indicated. Part 2 of the paper deals with nonlinear aspects of the actuator-mechanism system.

Shock and Dynamic Loading in Portable Electronic Assemblies: Experimental Results

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
A. F. Askari Farahani ◽  
M. Al-Bassyiouni ◽  
A. Dasgupta
Keyword(s):  
Dynamic Response ◽  
Dynamic Loading ◽  
Transient Response ◽  
Failure Modes ◽  
Dynamic Contact ◽  
System Level ◽  
Printed Wiring Board ◽  
Electronic Product ◽  
Electronic Assemblies ◽  
Plastic Housing

The development of portable electronics poses design challenges when evolving new designs for high strain-rate life cycle loading, such as in drop events, blast events, vibration, ultrasonic process steps, etc. This paper discusses an experimental investigation of the transient response of a portable electronic product and its subassemblies to dynamic mechanical loading encountered in drop and shock conditions. The portable electronic product tested in this study consists of a circuit card assembly and a battery pack supported in a two-piece plastic housing with a separate battery compartment. Dynamic loading, consisting of various shock profiles, is applied using an electrodynamic shaker. A number of drop tests are also conducted on a drop tower. Fourier transform technique (FFT) is utilized to analyze the dynamic response of the printed wiring board and the plastic housing in the frequency domain. Tests at the subassembly level are used to study the dynamic response of the individual constituents. The nonlinear interactions due to dynamic contact between these subassemblies are then investigated through shock and drop testing at the system level. These results will be used in a subsequent study to investigate the ability of finite element models to accurately capture this transient response of complex portable electronic assemblies under shock and drop loading. The long-term goal of this combined study is to demonstrate a systematic modeling methodology to predict the drop response of future portable electronic products, so that relevant failure modes can be eliminated by design iterations early in the design cycle.

Motion Performance Analysis of Double-Slider Two-DOF Parallel Manipulators

2010 ◽  
Author(s):  
Hong Zhou ◽  
Mukesh Nagapuri ◽  
Sheetal Reddy Mamidi ◽  
Raj Kumar Gandham
Keyword(s):  
Performance Analysis ◽  
Parallel Manipulator ◽  
Parallel Manipulators ◽  
Degree Of Freedom ◽  
Serial Manipulators ◽  
Operation Speed ◽  
Transmission Angle ◽  
Motion Performance ◽  
The Common ◽  
Two Degree Of Freedom

Double-slider parallel manipulators are closed-loop two-degree-of-freedom linkages. They are preferred to use because of their simplicity plus the common advantages of parallel manipulators such as high stiffness, load-bearing, operation speed and precision positioning. Like other parallel manipulators, the output motion of double-slider parallel manipulators is not as flexible as two-degree-of-freedom serial manipulators. The motion performance analysis plays a crucial role for this type of parallel manipulator to be applied successfully. In this paper, the linkage feasibility conditions are established based on the transmission angle. When feasibility conditions are satisfied, there is no dead position during operation. The workspace is generated by using curve-enveloping theory. The singularity characteristics are analyzed within the workspace. The motion performance index contours within the workspace are produced using the condition number of the manipulator Jacobian matrix. The results of this paper provide guidelines to design this type of parallel manipulator.

An Investigation of a-Si:H Thin Film Transistors by A Comparison of Transient Measurements and Numerical Simulations.

1992 ◽  
Vol 258 ◽  
Author(s):  
M.F. Willums ◽  
M. Hack ◽  
P.G. Lecomber ◽  
J. Shaw
Keyword(s):  
Thin Film ◽  
Dynamic Response ◽  
Numerical Simulations ◽  
Amorphous Silicon ◽  
Transient Response ◽  
Thin Film Transistors ◽  
Silicon Layer ◽  
Drain Current ◽  
Two Dimensional ◽  
Transient Measurements

ABSTRACTTransient measurements of the source-drain current ISD of amorphous silicon (a-Si:H) thin film transistors are compared with the results of two dimensional simulations. In particular, we have investigated the effect of different amorphous silicon layer thicknesses on the transient response. It is found that the dynamic response of a transistor with 0.4 μm a-Si:H is significantly slower than that of a device with only 0.06 μm of a-Si:H.

Application of Floquet Theory to On-Off Valve Controlled Pneumatic Actuators

1992 ◽  
Vol 114 (2) ◽  
pp. 299-305 ◽  
Author(s):  
Cengiz Kunt ◽  
Rajendra Singh
Keyword(s):  
Dynamic Response ◽  
Transient Response ◽  
Floquet Theory ◽  
Linear Time ◽  
Computational Technique ◽  
Valuable Insight ◽  
Pneumatic Actuators ◽  
Periodic Linear ◽  
Straightforward Solution ◽  
The Stability

A periodic linear time varying (LTV) model for on-off valve controlled pneumatic actuation systems, was described in an earlier paper by the authors. Based on this LTV model formulation, Floquet’s Theorem is invoked to characterize dynamic response of the system. A new computational technique called the expanded state space method is developed to calculate the frequency response of the LTV system with staircase coefficient variations. This technique is computationally superior to the straightforward solution scheme. Floquet Theory is also used to assess the nature of transient response. A single acting cylinder system controlled by an on-off valve is considered to illustrate the stability and transient response issues. Computer simulation based on the nonlinear model is used to obtain detailed results. It is shown that application of the Floquet Theory provides valuable insight into the dynamic response of the class of actuators considered.

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