Dynamic Studies on the Recurve Bow

2015 ◽  
Vol 741 ◽  
pp. 37-40
Author(s):  
Ji He Zhou ◽  
Yu Qin Shi
Keyword(s):  
Dynamic Characteristics ◽  
Strain Gauge ◽  
Dynamic Strain ◽  
Measurement Technology ◽  
Acceleration Sensor ◽  
Electrical Quantity ◽  
Dynamic Studies ◽  
Strain Process ◽  
Quantity Measurement

By utilizing the acceleration sensor and the strain gauge, the non electrical quantity measurement technology, we collected the data of the dynamic strain process in the actual shooting circumstances of athletes and get the data through the computer; exploratory proposed the dynamic characteristics of the bow.

Technique of Strain-Gauge Measurement of the Dynamic Characteristics of Percussion Music

2020 ◽  
Vol 56 (2) ◽  
pp. 186-191
Author(s):  
V. À. Maksimyuk ◽  
Å. À. Sushchenko ◽  
I. B. Fetisov
Keyword(s):  
Dynamic Characteristics ◽  
Strain Gauge ◽  
Gauge Measurement

Dynamic Response Analysis of Mortar Block under Blast Loading Using Digital Image Correlation

2018 ◽  
Vol 910 ◽  
pp. 161-166 ◽  
Author(s):  
Tei Saburi ◽  
Toshiaki Takahashi ◽  
Shiro Kubota ◽  
Yuji Ogata
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Gauge ◽  
Strain Distribution ◽  
Three Dimensional ◽  
Image Correlation ◽  
Dynamic Strain ◽  
Small Scale ◽  
Response Analysis ◽  
Strain Profile

The dynamic strain distribution behavior of a mortar block blasting was experimentally investigated. A small-scale blasting experiment using a mortar block with well-defined property was conducted and the dynamic strain distribution on the mortal block surface was analyzed using a Digital Image Correlation (DIC) method to establish the effective method for investigating the relationship between blast design and fracture mechanism. The block was blasted by simultaneous detonation of Composition C4 explosive charges with an electric detonator in two boreholes. The behavior of the block surface was observed by two high-speed cameras for three-dimensional DIC analysis and it was also measured by a strain-gauge for comparison. The three-dimensional displacements of the free surface of the block were obtained and dynamic strain distributions were computed. A point strain profile extracted from the analyzed strain distribution data was compared with a directly observed strain profile by the strain gauge.

Application of Piezoelectricity Acceleration Sensor to Dynamic Characteristics Monitoring of Tied Arch Bridge

2012 ◽  
Vol 184-185 ◽  
pp. 715-718 ◽  
Author(s):  
Yi Li ◽  
Zhong Guo ◽  
Hua Wei
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Dynamic Characteristics ◽  
Health Monitoring ◽  
Damping Ratio ◽  
Vibration Signal ◽  
Mode Shapes ◽  
Acceleration Sensor ◽  
Arch Bridge ◽  
Tied Arch Bridge

In bridge structural health monitoring, random vibration test and monitoring bridge dynamic characteristics provides an effective method for evaluation of bridge safety and serviceability performance. Piezoelectric accelerometer overcome the draw backs of the traditional sensor characteristic measuring instrument which are functional singleness and monopoly used, a piezoelectricity acceleration sensor performance analysis and dynamic characteristics monitoring system base on a tied arch bridge health monitoring system was designed, and the hardware structure and software of the system were introduced, acquired vibration signal can be displayed, stored, analyzed and processed in real time. The vibration frequency of the bridge structure, mode shapes and damping ratio is calculated base on the monitoring data, and the amplitude of frequency domain shows that the system was validated in actual real-time monitoring of bridge dynamic characteristics.

scholarly journals Design, development, calibration, and testing of indigenously developed strain gauge based dynamometer for cutting force measurement in the milling process

2020 ◽  
Vol 14 (2) ◽  
pp. 6594-6609 ◽  
Author(s):  
T. Mohanraj ◽  
S. Shankar ◽  
R. Rajasekar ◽  
M.S. Uddin
Keyword(s):  
Cutting Force ◽  
Dynamic Characteristics ◽  
Strain Gauge ◽  
Force Measurement ◽  
Machining Process ◽  
Series Data ◽  
Design Development ◽  
Element Analysis ◽  
Cross Sensitivity ◽  
Static And Dynamic Characteristics

In this work, a milling dynamometer based on strain gauge with an octagonal and square ring was designed and tested. Strain gauges were attached with the mechanical rings to detect the deformation, during the machining process. Wheatstone bridge circuit was equipped with gauges to acquire the strain as voltage owing to the deformation of mechanical rings when machining takes place. The finite element analysis (FEA) was used to identify the location of maximum deformation and stress. The direction of rings and location of gauges were decided to increase the sensitivity and decrease the cross-sensitivity. Then, the cutting force was acquired through NI 6221 M series data acquisition (DAQ) card. The dynamometer had undergone a cycle of tests to verify its static and dynamic characteristics. The metrological characterization was performed according to the calibration procedure based on ISO 376 – 2011 standard. The cutting force was measured with both the dynamometers through milling experiments based on Taguchi’s L9 orthogonal array and the results were recorded. The measured cutting force varied from 300 N to 550 N. The obtained results depicted that low-cost milling dynamometer was reliable to measure the three component machining force. Overall, the square ring based dynamometer provides the better static and dynamic characteristics in terms of linearity, cross-sensitivity (4%), uncertainty (0.054%), and natural frequency (362.41 rev/s).

High temperature static and dynamic strain response of PdCr thin film strain gauge prepared on Ni-based superalloy

2019 ◽  
Vol 298 ◽  
pp. 111571 ◽  
Author(s):  
Hao Liu ◽  
Xiling Mao ◽  
Zhengbing Yang ◽  
Jinting Cui ◽  
Shuwen Jiang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Strain Gauge ◽  
Dynamic Strain ◽  
Strain Response

scholarly journals Investigation on Seismic Damage Model Test of a High Concrete Gravity Dam Based on Application of FBG Strain Sensor

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mingming Wang ◽  
Jianyun Chen ◽  
Hai Wei ◽  
Bingyue Song ◽  
Weirong Xiao
Keyword(s):  
Strain Gauge ◽  
Safety Evaluation ◽  
Strain Sensor ◽  
High Sensitivity ◽  
Model Material ◽  
Gravity Dam ◽  
Scale Model ◽  
Dynamic Strain ◽  
Small Scale ◽  
Small Scale Model

A 203-m-high gravity dam being built in earthquake-prone areas needs to be investigated very carefully to determine its dynamic responses, damage mechanism, and safety evaluation. The dynamic characteristics, seismic responses, failure mode, and safety evaluation of the above structure are presented through dynamic fracture test for small-scale model on shaking table. Because the strength of the model material is very low, the traditional strain gauge is also not easy to be glued to the surface of model. It is difficult to measure the accurate strain data of small-scale model during testing. Therefore, Fiber Bragg Grating (FBG) strain sensor is presented to obtain the strain of small-scale model during testing, due to its high sensitivity. The dynamic strain and residual strain are obtained with the FBG sensors embedded in model. The FBG sensor is adhered to model material completely and shows advantages of ease for installation, high sensitivity, and reliability compared with traditional resistance strain gauge. The model during testing is submitted with earthquake wave from the Chinese Code. In the experiment, the peak ground acceleration (PGA) of the first crack in the model indicates the safety level of the gravity dam. The crack locations and forms determine the damageable part of gravity dam under intense earthquake. After the final analysis, the safety evaluation result of the gravity dam under strong earthquake is given in order to guide the implementation of the project.

Venous Claudication Evaluated by Ambulatory Plethysmography

1992 ◽  
Vol 7 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Iris Baumgartner ◽  
U. K. Franzeck ◽  
A. Bollinger
Keyword(s):  
Strain Gauge ◽  
Treadmill Exercise ◽  
Venous Occlusion ◽  
University Hospital ◽  
Dynamic Strain ◽  
Volume Changes ◽  
Strain Gauge Plethysmography ◽  
The Subject ◽  
Venous Claudication ◽  
Prospective Investigation

Objective: To determine whether dynamic plethysmography during treadmill exercise allows objective confirmation of venous claudication. Design: Prospective investigation of the use of calf volume changes during treadmill work using dynamic strain-gauge plethysmography. Setting: University Hospital, Zürich, Switzerland. Patients: Eighteen patients with suspected venous claudication who had occlusions or stenoses in the femoral or iliac veins shown on phlebography and/or Duplex scanning, compared to a group of 20 healthy volunteers. Interventions: Venous occlusion strain-gauge plethysmography was carried out, followed by continuous volume recording while on a treadmill set at 10° and velocity of 7 km/hr for 3 minutes or until pain forced the subject to stop. Main outcome measure: Calf volume changes during exercise. Results: Significant differences were observed in calf volume changes during exercise in the group of patients with venous stenoses or occlusions and symptomatic venous claudication. Conclusion: Dynamic plethysmography during treadmill exercise allows objective confirmation of venous claudication.

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