State-of-the-Art: Building Pounding, Link Elements and the Evaluation of Impact Forces and Energy Dissipation

2013 ◽  
Author(s):  
H. Naderpour ◽  
R.C. Barros ◽  
S.M. Khatami
Keyword(s):  
Energy Dissipation ◽  
State Of The Art ◽  
Impact Forces

scholarly journals Experimental Analysis on the Cyclic Response of Beam to Column Joints: State-of-the-Art at Salerno University

2014 ◽  
Vol 8 (1) ◽  
pp. 227-247 ◽  
Author(s):  
M. Latour ◽  
G. Rizzano
Keyword(s):  
Energy Dissipation ◽  
Design Process ◽  
Research Group ◽  
Experimental Analysis ◽  
State Of The Art ◽  
Initial Stiffness ◽  
Design Rules ◽  
Cyclic Behaviour ◽  
Analytical Work ◽  
The University

Aiming to provide a contribution to the codification of design rules for dissipative joints to be applied to MRFs, in last five years, a comprehensive experimental and analytical work dealing with the cyclic behaviour of beam-to-column joints has been developed by the research group of the University of Salerno. In particular, the activity has regarded the study of both classical and innovative typologies characterized by the same initial stiffness and resistance but by different hysteretic behaviours due to the different source of energy dissipation supply imposed in the design process. In this paper, the main results of such a study, performed at the laboratory of materials and structures of the University of Salerno, are reported in order to provide an overview on the main mechanisms involved in the energy dissipation of partial-strength connections. A particular attention is given to the design issues by presenting the procedures aimed at providing to the joints adequate characteristics in terms of stiffness, resistance and ductility supply by hierarchically controlling the behaviour of the single joint components. Furthermore, the results of tested joints (classical and innovative) are compared in terms of hysteretic behaviour and energy dissipation supply in order to point out the advantages of the different connecting systems.

scholarly journals Block ramps for stream power attenuation in gravel-bed streams: a review

2020 ◽  
Author(s):  
Rakesh Kumar Chaudhary ◽  
Nayan Sharma ◽  
Zulfequar Ahmad
Keyword(s):  
Energy Dissipation ◽  
Flow Resistance ◽  
Simple Technique ◽  
State Of The Art ◽  
Flow Characteristics ◽  
Stream Power ◽  
Gravel Bed ◽  
The Past ◽  
Gravel Bed Streams ◽  
Block Ramp

Abstract Application of block ramp technique in steep gradient streams for energy dissipation as well as to maintain river stability finds increasing favor amongst researchers and practitioners in river engineering. This paper dwells on a comprehensive state-of-the-art review of flow resistance, energy dissipation,flow characteristics, stability, and drag force on block ramp by various investigators in the past. The forms and equations for each type are thoroughly discussed with the objective of finding the grey areas and gaps. While, more research is warranted further to improve the equations, essential for design analysis. Block ramps can be a promising simple technique to achieve reasonable attenuation of devastating fluvial forces unleashed in gravel-bed streams during cloud bursts.

scholarly journals Geographic and Opportunistic Recovery with Depth and Power Transmission Adjustment for Energy-Efficiency and Void Hole Alleviation in UWSNs

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 709 ◽  
Author(s):  
Abdul Mateen ◽  
Muhammad Awais ◽  
Nadeem Javaid ◽  
Farruh Ishmanov ◽  
Muhammad Afzal ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Routing Protocols ◽  
Power Transmission ◽  
State Of The Art ◽  
Maximum Energy ◽  
Underwater Wireless Sensor Networks ◽  
Routing Schemes ◽  
End To End Delay ◽  
Extra Energy ◽  
Wide Range

Underwater Wireless Sensor Networks (UWSNs) are promising and emerging frameworks having a wide range of applications. The underwater sensor deployment is beneficial; however, some factors limit the performance of the network, i.e., less reliability, high end-to-end delay and maximum energy dissipation. The provisioning of the aforementioned factors has become a challenging task for the research community. In UWSNs, battery consumption is inevitable and has a direct impact on the performance of the network. Most of the time energy dissipates due to the creation of void holes and imbalanced network deployment. In this work, two routing protocols are proposed to avoid the void hole and extra energy dissipation problems which, due to which lifespan of the network increases. To show the efficacy of the proposed routing schemes, they are compared with the state of the art protocols. Simulation results show that the proposed schemes outperform the counterparts.

scholarly journals Ultra-Low-Energy Straintronics Using Multiferroic Composites

2014 ◽  
Vol 1691 ◽  
Author(s):  
Kuntal Roy
Keyword(s):  
Signal Processing ◽  
Energy Dissipation ◽  
Room Temperature ◽  
State Of The Art ◽  
Low Energy ◽  
Analog Signal ◽  
Suitable Choice ◽  
Voltage Gain ◽  
Magnetization Dynamics ◽  
Current State

ABSTRACTThe primary impediment to continued improvement of charge-based electronics is the excessive energy dissipation incurred in switching a bit of information. With suitable choice of materials, devices made of multiferroic composites, i.e., strain-coupled piezoelectric-magnetostrictive heterostructures, dissipate miniscule amount of energy of ∼1 attojoule at room-temperature, while switching in sub-nanosecond delay. Apart from devising memory bits, such devices can be also utilized for building logic, so that they can be deemed suitable for computing purposes as well. Here, we first review the current state of the art for building nanoelectronics using multiferroic composites. On a recent development, it is shown that these multiferroic straintronic devices can be also utilized for analog signal processing, with suitable choice of materials. By solving stochastic Landau-Lifshitz-Gilbert equation of magnetization dynamics at room-temperature, it is shown that we can achieve a voltage gain, i.e., these straintronic devices can act as voltage amplifiers.

On the Evolution of Energy Dissipation Devices for Seismic Design

2002 ◽  
Vol 18 (2) ◽  
pp. 309-346 ◽  
Author(s):  
Juan Enrique Martínez-Rueda
Keyword(s):  
Energy Dissipation ◽  
Nonlinear Analysis ◽  
Seismic Design ◽  
Historical Perspective ◽  
State Of The Art ◽  
Original Research ◽  
Experimental Assessment ◽  
Analysis Techniques ◽  
The Subject ◽  
Energy Dissipation Devices

A review of the evolution of energy dissipation devices of hysteretic type is presented. Both friction and yielding devices are included in the paper covering a worldwide range of applications. Due to the increasingly large number of available devices, the paper does not attempt to present a state-of-the-art on the subject, but to focus on discussing the main original research efforts that have paved the way of the current technology of energy dissipation devices. Relevant past applications of devices are briefly described making particular emphasis on important issues such as experimental assessment, effectiveness of their modeling by nonlinear analysis techniques, materials and constructability. Devices selected for discussion in the paper are presented in a historical perspective and are considered pioneer original steps or research efforts directed towards an efficient and rational use of energy dissipation technology.

scholarly journals Microscopic Theory of Energy Dissipation and Decoherence in Solid-State Quantum Devices: Need for Nonlocal Scattering Models

Entropy ◽  
2018 ◽  
Vol 20 (10) ◽  
pp. 726 ◽  
Author(s):  
Rita Iotti ◽  
Fausto Rossi
Keyword(s):  
Relaxation Time ◽  
Energy Dissipation ◽  
State Of The Art ◽  
Microscopic Theory ◽  
Quantum Mechanical ◽  
Pauli Blocking ◽  
Quantum Devices ◽  
Semiconductor Nanostructure ◽  
Carrier Interaction ◽  
Intersubband Relaxation

Energy dissipation and decoherence in state-of-the-art quantum nanomaterials and related nanodevices are routinely described and simulated via local scattering models, namely relaxation-time and Boltzmann-like schemes. The incorporation of such local scattering approaches within the Wigner-function formalism may lead to anomalous results, such as suppression of intersubband relaxation, incorrect thermalization dynamics, and violation of probability-density positivity. The primary goal of this article is to investigate a recently proposed quantum-mechanical (nonlocal) generalization (Phys. Rev. B 2017, 96, 115420) of semiclassical (local) scattering models, extending such treatment to carrier–carrier interaction, and focusing in particular on the nonlocal character of Pauli-blocking contributions. In order to concretely show the intrinsic limitations of local scattering models, a few simulated experiments of energy dissipation and decoherence in a prototypical quantum-well semiconductor nanostructure are also presented.

scholarly journals Variable Impedance Control and Learning—A Review

2020 ◽  
Vol 7 ◽  
Author(s):  
Fares J. Abu-Dakka ◽  
Matteo Saveriano
Keyword(s):  
State Of The Art ◽  
Impedance Control ◽  
Mechanical Impedance ◽  
Contact Forces ◽  
Task Execution ◽  
Context Variable ◽  
Advantages And Disadvantages ◽  
Impact Forces ◽  
And Control ◽  
Open Issues

Robots that physically interact with their surroundings, in order to accomplish some tasks or assist humans in their activities, require to exploit contact forces in a safe and proficient manner. Impedance control is considered as a prominent approach in robotics to avoid large impact forces while operating in unstructured environments. In such environments, the conditions under which the interaction occurs may significantly vary during the task execution. This demands robots to be endowed with online adaptation capabilities to cope with sudden and unexpected changes in the environment. In this context, variable impedance control arises as a powerful tool to modulate the robot's behavior in response to variations in its surroundings. In this survey, we present the state-of-the-art of approaches devoted to variable impedance control from control and learning perspectives (separately and jointly). Moreover, we propose a new taxonomy for mechanical impedance based on variability, learning, and control. The objective of this survey is to put together the concepts and efforts that have been done so far in this field, and to describe advantages and disadvantages of each approach. The survey concludes with open issues in the field and an envisioned framework that may potentially solve them.

Sign in / Sign up

Export Citation Format

Share Document