An Improved Strain-Gage Signal Conditioner for Dynamic Stress Measurement

1991 ◽  
Author(s):  
Bob G. Mahrenholz
Keyword(s):  
Strain Gage ◽  
Dynamic Stress ◽  
Stress Measurement ◽  
Improved Strain

scholarly journals Dynamic Stress Measurement with Sensor Data Compensation

Electronics ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 859
Author(s):  
Jingjing Gu ◽  
Zhiteng Dong ◽  
Cai Zhang ◽  
Xiaojiang Du ◽  
Mohsen Guizani
Keyword(s):  
Neural Network ◽  
Dynamic Stress ◽  
Stress Measurement ◽  
Rapid Change ◽  
Back Propagation ◽  
Environmental Parameters ◽  
Back Propagation Neural Network ◽  
Sensor Data ◽  
Bee Colony ◽  
Stability Of Solution

Applying parachutes-deployed Wireless Sensor Network (WSN) in monitoring the high-altitude space is a promising solution for its effectiveness and cost. However, both the high deviation of data and the rapid change of various environment factors (air pressure, temperature, wind speed, etc.) pose a great challenge. To this end, we solve this challenge with data compensation in dynamic stress measurements of parachutes during the working stage. Specifically, we construct a data compensation model to correct the deviation based on neural network by taking into account a variety of environmental parameters, and name it as Data Compensation based on Back Propagation Neural Network (DC-BPNN). Then, for improving the speed and accuracy of training the DC-BPNN, we propose a novel Adaptive Artificial Bee Colony (AABC) algorithm. We also address its stability of solution by deriving a stability bound. Finally, to verify the real performance, we conduct a set of real implemented experiments of airdropped WSN.

Thin film stress measurement by fiber optic strain gage

2006 ◽  
Vol 494 (1-2) ◽  
pp. 141-145 ◽  
Author(s):  
S.M.M. Quintero ◽  
W.G. Quirino ◽  
A.L.C. Triques ◽  
L.C.G. Valente ◽  
A.M.B. Braga ◽  
...  
Keyword(s):  
Thin Film ◽  
Strain Gage ◽  
Fiber Optic ◽  
Stress Measurement ◽  
Film Stress ◽  
Thin Film Stress

Nondestructive Monitoring of Stress Relaxation in Welded Steel Plates

2002 ◽  
Vol 124 (3) ◽  
pp. 343-348 ◽  
Author(s):  
Brent H. Chance ◽  
Don E. Bray
Keyword(s):  
Stress Relaxation ◽  
Strain Gage ◽  
Stress Measurement ◽  
Steel Plates ◽  
Tension Stress ◽  
Nondestructive Monitoring ◽  
Strain Gages ◽  
Welded Steel ◽  
Ultrasonic Measurements ◽  
Oriented Parallel

This study investigates transverse stress relaxation in welded steel plates. Two different methods of stress measurement were used; strain gages and critically refracted longitudinal LCR waves. The material investigated was ASTM 1008/1010 steel. T-shaped slots were cut from each edge of each specimen in order to provide a uniaxial tension stress field in the area of investigation. After the plates were stress-relieved by annealing, the transverse slots were then welded and allowed to cool. Strain gages were applied to the bridge area joining the middle of the plate and oriented parallel to the long side of the plate. Initial strain gage and ultrasonic measurements were then performed. At different time intervals, cutting through a sample plate’s welds relieved the stresses. Strain gage and ultrasonic measurements were then repeated. Both the strain gage and LCR methods indicate that there is a measurable stress relaxation in the plates, and that it occurs in a time-dependent and predictable manner.

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