scholarly journals Fabrication And Analysis Of 3d Wind Sonic Using A Dual Transduser Sensor Arrangement

2021 ◽  
Vol 1951 (1) ◽  
pp. 012039
Author(s):  
E E Barus ◽  
M S Muntini ◽  
A C Louk
Keyword(s):  
Sensor Arrangement

Rotating Accuracy Measurement System of Spindle Based on Three Point Method

2013 ◽  
Vol 333-335 ◽  
pp. 167-171
Author(s):  
Peng Qing Wang ◽  
Hong Jun Wang ◽  
He Peng Gao
Keyword(s):  
Personal Computer ◽  
Rotating Machinery ◽  
Point Method ◽  
Measuring System ◽  
Harmonic Suppression ◽  
Construction Site ◽  
Software Module ◽  
Accuracy Measurement ◽  
Sensor Arrangement ◽  
On Line

In order to measure the rotating machinery fault quickly and conveniently at a construction site, a new measuring system of rotating accuracy of spindle was developed according to three point method. With summarizing the principle of error separation technique based on three point method, the function, hardware construction and software module of this module were introduced. The problem of harmonic suppression is relieved by changing the sensor arrangement. The measuring system mainly consists of three eddy current sensors ,a acquisition card and a personal computer. After a few parameters were inputted, the rotation accuracy of calculation and display could be carried out automatically on line at a construction site.

Research and Application of Ultrasonic Guided Wave With L(0,2) Mode for Elbow Tube Defect Inspection

2018 ◽  
Author(s):  
Ju Ding ◽  
Min Zhang ◽  
Shu-Hong Liu ◽  
Chen-huai Tang ◽  
Jie-Lu Wang ◽  
...  
Keyword(s):  
Guided Wave ◽  
Test Results ◽  
Wave Excitation ◽  
Defect Inspection ◽  
Long Distance ◽  
Pipeline Inspection ◽  
Type Wave ◽  
Sensor Arrangement ◽  
Pipe Elbow ◽  
Ultrasonic Guided Wave

Ultrasonic guided wave inspection technology has been widely for long distance pipeline inspection; however, the pipe elbow’s discontinuous structure and the dispersion of L-type wave are restricting the application of this technology. This paper proposes a method of L(0,2) mode guided wave excitation based on magnetostrictive effect and explores the optimization of the magnetization sensor arrangement. Test results shows that the proposed method can detect many types of defects in the pipe elbow. This paper encourages the use of L(0,2) mode guided wave excitation based on magnetostrictive effect in pipeline site inspections.

scholarly journals Condition Assessment of PC Tendon Duct Filling by Elastic Wave Velocity Mapping

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Kit Fook Liu ◽  
Hwa Kian Chai ◽  
Nima Mehrabi ◽  
Kobayashi Yoshikazu ◽  
Tomoki Shiotani
Keyword(s):  
Travel Time ◽  
Prestressed Concrete ◽  
Large Scale ◽  
Imaging Techniques ◽  
Effective Means ◽  
Concrete Structures ◽  
Tendon Sheath ◽  
Elastic Wave Velocity ◽  
Velocity Mapping ◽  
Sensor Arrangement

Imaging techniques are high in demand for modern nondestructive evaluation of large-scale concrete structures. The travel-time tomography (TTT) technique, which is based on the principle of mapping the change of propagation velocity of transient elastic waves in a measured object, has found increasing application for assessing in situ concrete structures. The primary aim of this technique is to detect defects that exist in a structure. The TTT technique can offer an effective means for assessing tendon duct filling of prestressed concrete (PC) elements. This study is aimed at clarifying some of the issues pertaining to the reliability of the technique for this purpose, such as sensor arrangement, model, meshing, type of tendon sheath, thickness of sheath, and material type as well as the scale of inhomogeneity. The work involved 2D simulations of wave motions, signal processing to extract travel time of waves, and tomography reconstruction computation for velocity mapping of defect in tendon duct.

scholarly journals Network Optimisation and Performance Analysis of a Multistatic Acoustic Navigation Sensor

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5718
Author(s):  
Rohan Kapoor ◽  
Alessandro Gardi ◽  
Roberto Sabatini
Keyword(s):  
Acoustic Waves ◽  
Navigation Systems ◽  
Sound Waves ◽  
Test Volume ◽  
Positioning Accuracy ◽  
Sensor Arrangement ◽  
Pvt Data ◽  
Acoustic Navigation ◽  
And Performance ◽  
Ranging Errors

This paper addresses some of the existing research gaps in the practical use of acoustic waves for navigation of autonomous air and surface vehicles. After providing a characterisation of ultrasonic transducers, a multistatic sensor arrangement is discussed, with multiple transmitters broadcasting their respective signals in a round-robin fashion, following a time division multiple access (TDMA) scheme. In particular, an optimisation methodology for the placement of transmitters in a given test volume is presented with the objective of minimizing the position dilution of precision (PDOP) and maximizing the sensor availability. Additionally, the contribution of platform dynamics to positioning error is also analysed in order to support future ground and flight vehicle test activities. Results are presented of both theoretical and experimental data analysis performed to determine the positioning accuracy attainable from the proposed multistatic acoustic navigation sensor. In particular, the ranging errors due to signal delays and attenuation of sound waves in air are analytically derived, and static indoor positioning tests are performed to determine the positioning accuracy attainable with different transmitter–receiver-relative geometries. Additionally, it is shown that the proposed transmitter placement optimisation methodology leads to increased accuracy and better coverage in an indoor environment, where the required position, velocity, and time (PVT) data cannot be delivered by satellite-based navigation systems.

Physical constraints fused equiangular tight frame method for Blade Tip Timing sensor arrangement

Measurement ◽  
2019 ◽  
Vol 145 ◽  
pp. 841-851 ◽  
Author(s):  
Shuming Wu ◽  
Zhibin Zhao ◽  
Zhibo Yang ◽  
Shaohua Tian ◽  
Laihao Yang ◽  
...  
Keyword(s):  
Tight Frame ◽  
Physical Constraints ◽  
Sensor Arrangement ◽  
Blade Tip ◽  
Frame Method

Cleaning magnetometer data using multi sensor configuration

2020 ◽  
Author(s):  
Dragos Constantinescu ◽  
Hans-Ulrich Auster ◽  
Magda Delva ◽  
Olaf Hillenmaier ◽  
Werner Magnes ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Sensor Arrangement ◽  
Magnetometer Data ◽  
Service Oriented ◽  
Sensor Configuration ◽  
First Time ◽  
The Magnetic Field ◽  
Magnetic Cleanliness

<p>Measuring the in situ magnetic field using space borne instruments requires either a magnetically clean platform and/or a very long boom for accommodating magnetometers sensors at a large distance from the spacecraft body. This significantly drives up the costs and time for building the spacecraft. Here we present an alternative sensor configuration and an algorithm allowing for ulterior removing of the spacecraft generated disturbances from the magnetic field measurements, thus lessening the need for a magnetic cleanliness program.</p><p>The Service Oriented Spacecraft Magnetometer (SOSMAG) onboard the Korean Geostationary Satellite GEO-KOMPSAT-2A (GK-2A) uses for the first time a multi-sensor configuration for onboard data cleaning. To remove the AC disturbances, a combination of the measurements from sensors placed at different positions from the disturbance sources is processed onboard. Sensor biases due to daily temperature variations are also removed using the specific SOSMAG sensor arrangement. </p><p> </p>

Stochastic Optimal Control of Vehicles With Elastic Body and Active Suspension

1986 ◽  
Vol 108 (2) ◽  
pp. 106-110 ◽  
Author(s):  
Aleksander Hac´
Keyword(s):  
Optimal Control ◽  
Stochastic Optimal Control ◽  
Measurement Errors ◽  
Active Suspension ◽  
Active System ◽  
State Behavior ◽  
Controlled System ◽  
Sensor Arrangement ◽  
Suspension Control ◽  
Control Forces

A discrete-continuous vibrating system, which can be treated as a model of a vehicle with an active suspension moving on a randomly profiled road, is considered in this paper. By the use of stochastic optimal control and estimation theory the suspension control forces and the steady-state behavior of an optimally controlled system in the presence of measurement errors are calculated and compared with the performance of an optimal passive system. The emphasis is on modeling and measurement problems. The need for taking body elasticity into account in the vehicle model is considered and the influence of sensor arrangement and accuracy upon the performance of the active system is determined.

Damage Identification of T-Beam Bridge Based on Distributed Long-Gauge Strain Mode Theory

2014 ◽  
Vol 501-504 ◽  
pp. 1352-1358
Author(s):  
Bi Tao Wu ◽  
Gang Wu ◽  
Cai Qian Yang
Keyword(s):  
Reinforced Concrete ◽  
Strain Amplitude ◽  
Health Monitoring ◽  
Damage Identification ◽  
Amplitude Variation ◽  
Strain Mode ◽  
Mode Theory ◽  
Sensor Arrangement ◽  
Beam Bridge ◽  
T Beam

Damage identification of a T-beam bridge which contains five T-beams is conducted based on distributed long - gauge strain mode theory, considering the damage and aging problems of widely used simple-supported reinforced concrete T-beam bridges. Assuming that the damage occurs in the different T-beams, the normalized strain mode is used to identify the damage. The sensitivity of the normalized strain mode of each T-beam and change rule of strain mode curve is studied at the same time. It is effective to apply modal strain amplitude variation degree to detect damages. If sensors are arranged reasonablely, a good damage identification can be obtained by utilizing distributed long-gauge strain mode theory even if the damage is slight.Some suggestions are given for the sensor arrangement and health monitoring of this kind of bridge when using the distributed long-gauge strain mode theory at last.

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