scholarly journals System identification of smart structures under high impact loads

2012 ◽  
Author(s):  
Y. Kim ◽  
T. El-Korchi ◽  
K. S. Arsava
Keyword(s):  
System Identification ◽  
Smart Structures ◽  
High Impact ◽  
Impact Loads

Nonlinear system identification of smart structures under high impact loads

2013 ◽  
Vol 22 (5) ◽  
pp. 055008 ◽  
Author(s):  
Kemal Sarp Arsava ◽  
Yeesock Kim ◽  
Tahar El-Korchi ◽  
Hyo Seon Park
Keyword(s):  
System Identification ◽  
Nonlinear System ◽  
Smart Structures ◽  
Nonlinear System Identification ◽  
High Impact ◽  
Impact Loads

Mechanism of Parameters Variation about Electronic Components Subjected to High Impact Loads

2010 ◽  
Vol 44-47 ◽  
pp. 256-259 ◽  
Author(s):  
Bo Li ◽  
Ya Zhang ◽  
Hong Xiang Zhang
Keyword(s):  
Data Collection ◽  
Stress Level ◽  
Main Parameter ◽  
High Speed ◽  
Dynamic Testing ◽  
High Impact ◽  
Impact Loads ◽  
Electronic Components ◽  
Collection System ◽  
High Speed Data

Large quantity dynamic testing experiments are carried out to testing the parameter of electronic components in high over loading impact condition with a standard hammer machine and a high speed data collection system. And the experiments were performed for about 5000 times to more than 30 types of resistors, capacitors, transistors to test their main parameter in different stress level and fixing mode. The parameter of some electronic components appears more or less unstable, namely temporary failure, and it is sensitive to different stress level and impact direct in experiments, which can offer important value of references for reliability lifespan.

scholarly journals Simulation-Based Design and Optimization of Accelerometers Subject to High-Temperature and High-Impact Loads

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3759 ◽  
Author(s):  
Ji Li ◽  
Yaling Tian ◽  
Junjie Dan ◽  
Zhuming Bi ◽  
Jinhui Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
High Impact ◽  
Impact Loads ◽  
Sensing Element ◽  
Design And Optimization ◽  
Static And Dynamic Analysis ◽  
Simulation Based Design ◽  
Coupling Behavior ◽  
Simulation Based ◽  
Complete Failure

Due to multi-factor coupling behavior, the performance evaluation of an accelerometer subject to high-temperature and high-impact loads poses a significant challenge during its design phase. In this paper, the simulation-based method is applied to optimize the design of the accelerometer. The proposed method can reduce the uncertainties and improve the fidelity of the simulation in the sense that (i) the preloading conditions of fasteners are taken into consideration and modeled in static analysis; (ii) all types of loadings, including bolt preloads, thermal loads, and impact loads, are defined in virtual dynamic prototype of the accelerometer. It is our finding that from static and dynamic analysis, an accelerometer is exposed to the risk of malfunction and even a complete failure if the temperature rises to a certain limit; it has been proved that the thermal properties of sensing components are the most critical factors for an accelerometer to achieve its desired performance. Accordingly, we use a simulation-based method to optimize the thermal expansion coefficient of the sensing element and get the expected design objectives.

Extension velocity limiter for the ring of an elastically adaptive peripheral docking mechanism

2020 ◽  
pp. 44-55
Author(s):  
Yaroslav V. RASSKAZOV ◽  
Ivan E. CHERNYSHEV ◽  
Viktor D. KOBETS
Keyword(s):  
Friction Coefficient ◽  
High Velocity ◽  
Viscous Friction ◽  
High Impact ◽  
Ball Screw ◽  
Simplified Model ◽  
Initial Contact ◽  
Impact Loads ◽  
Ring Extension ◽  
Docking Mechanism

The docking ring of an elastically adaptive docking mechanism on the initial contact signal is extended by spring-loaded mechanisms of the rods in order to improve capture conditions. In the process, it reaches a high velocity, which applies unacceptably high impact loads to the docking interface. This paper discusses an extension velocity limiter for the docking ring, its analytical model, and a brief procedure for calculating its parameters. It describes a simplified model for ring extension during initial contact, and a method for determining viscous friction coefficient of the ball-screw pair of the docking mechanism, which is a parameter in the model. It presents the procedure, results and comparison of simulations of the docking ring extension both with the use of the proposed retarder and without it. It is demonstrated that the use of the velocity limiter permits to meet the requirements of the International Standard for pulsed loads on the passive interface. The paper describes a design option for velocity limiter that has acceptable mass and dimensions. Keywords: spacecraft docking, elastically adaptive docking mechanism, retraction device, velocity limiter, mechanical governor

Neuromuscular control in extreme high impact loads

2006 ◽  
Vol 39 ◽  
pp. S177
Author(s):  
J. Avela ◽  
M. Ishikawa ◽  
C. Nicol ◽  
P. Chavet ◽  
J. Peltonen ◽  
...  
Keyword(s):  
Neuromuscular Control ◽  
High Impact ◽  
Impact Loads

System identification of smart structures using a wavelet neuro-fuzzy model

2012 ◽  
Vol 21 (11) ◽  
pp. 115009 ◽  
Author(s):  
Ryan Mitchell ◽  
Yeesock Kim ◽  
Tahar El-Korchi
Keyword(s):  
System Identification ◽  
Smart Structures ◽  
Fuzzy Model ◽  
Neuro Fuzzy
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