scholarly journals Effect of Tensile Force on Magnetostrictive Sensors for Generating and Receiving Longitudinal Mode Guided Waves in Steel Wires

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Jiang Xu ◽  
Yong Li ◽  
Guang Chen
Keyword(s):  
Magnetic Field ◽  
Coupling Coefficient ◽  
Guided Waves ◽  
Steel Wire ◽  
Tensile Force ◽  
Longitudinal Mode ◽  
Effective Field ◽  
Bias Magnetic Field ◽  
Magnetostrictive Sensor ◽  
The Relationship

When the longitudinal mode guided waves based on magnetostrictive effect were employed to inspect the bridge cables, we found that there was a large difference in the signal’s amplitude of the same specification cable under different tensile force. This difference would affect the test results and the identification of defects. It is necessary to study the effect of tensile force on the signal for the reliability of detection. Firstly, the effective field theory is employed to take the force as an additional bias magnetic field. Then, the effect of the tensile force on generating and receiving longitudinal mode guided waves based on magnetostrictive effect is obtained by the relationship between the bias magnetic field and the magnetostrictive coupling coefficient. Finally, the experiment of the magnetostrictive sensor is carried out on a Φ5 mm steel wire under different force. The experimental results are in good agreement with the theoretical results. The results show that the existence of the tensile force would change the operation point for generating and receiving the longitudinal mode guided waves based on magnetostrictive effect, which associated with the coupling coefficient. In order to obtain the optimal conversion efficiency for the force state wire and cable, the applied bias magnetic field should be set smaller than the bias magnetic field for the force-free state.

scholarly journals Longitudinal Guided Wave Inspection of Small-Diameter Elbowed Steel Tubes with a Novel Squirrel-Cage Magnetostrictive Sensor

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Yao Liu ◽  
Xiucheng Liu ◽  
Chehua Yang ◽  
Wenxin Guo ◽  
Bin Wu ◽  
...  
Keyword(s):  
Finite Element ◽  
Guided Waves ◽  
Mode Conversion ◽  
Small Diameter ◽  
Longitudinal Mode ◽  
Guided Wave ◽  
Wall Defect ◽  
Squirrel Cage ◽  
Simulation Results ◽  
Magnetostrictive Sensor

In the study, ultrasonic longitudinal mode guided waves were employed to detect defects in elbowed tubes (without welds) with a diameter of 10 mm. Finite element simulation results highlighted that the emitted L(0,1) mode guided waves experienced strong reflection and mode conversion at the elbow region to generate F(1,1) mode, followed by slow and weak F(2,1) mode. The guided wave reflected from the elbow with a through-wall defect was manifested as two overlapped wave packets, which were good indicators of a defective elbow. To conduct L(0,1) mode guided waves inspection on the small-diameter elbowed tubes, a novel tailored squirrel-cage magnetostrictive sensor was employed in the experiment. The new sensor employed the configuration of segmental iron-cobalt strips and small-size permanent magnet arrays. The entire sensor is composed of two identical C-shaped sensor elements and can be recycled and installed conveniently. Experimental results obtained from healthy and defective tubes were consistent with the conclusions obtained from finite element simulations. An artificial through-wall defect at the elbow and a notch defect at the straight part of the tube could be simultaneously detected by L(0,1) mode guided waves through comparing experimental signals with simulation results.

A Study on Magnetostrictive Sensor for Detecting the Weld Defects

2011 ◽  
Vol 264-265 ◽  
pp. 373-378
Author(s):  
J.H. Seo ◽  
Il Soo Kim ◽  
B.Y. Kang ◽  
J.Y. Shim ◽  
J.W. Jeong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Real Time ◽  
Capital Investment ◽  
Guided Waves ◽  
Gas Oil ◽  
Efficient Tool ◽  
Weld Defects ◽  
Magnetostrictive Sensor ◽  
Industrial Needs ◽  
The Relationship

Industries such as gas, oil, petrochemical, chemical, and electric power have generally employed for the operation and used to enlarge the equipment or structures that require a high capital investment. In order to meet these requirements, the industries are increasingly moved toward saving the experimental verifications and computer simulation. Therefore industries to reduce the maintenance costs without compromising operational safety have been forced on finding better and more efficient methods to inspect their equipment and structures. It was motivated to meet the industrial needs and to secure and maintain the institute's technical initiative and leadership in the development of this new and exciting technology. Also, the system with many sensors could be detected the weld defects, and was useful for real-time monitoring. This paper is focused on the development of the real-time non-contract monitoring system as an efficient tool for the experimental study of weld defects based on the relationship between the measured voltage and input parameters. The monitoring technology involves the use of Ms S (Magnetostrictive Sensors) for the generation and detection of the guided waves. The developed system was employed to the experimental study in order to fine the weld defects for steel object with artificial defects used in the welding field.

Displacement model of the giant magnetostrictive actuator with strong bias magnetic field at low frequency

2016 ◽  
Vol 230 (19) ◽  
pp. 3568-3574
Author(s):  
Xue Guangming ◽  
Zhang Peilin ◽  
He Zhongbo ◽  
Li Dongwei ◽  
Yang Zhaoshu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Frequency ◽  
Experimental System ◽  
Bias Field ◽  
Bias Magnetic Field ◽  
Exciting Frequency ◽  
Magnetostrictive Actuator ◽  
Mass Spring ◽  
Displacement Model ◽  
The Relationship

A giant magnetostrictive actuator is designed with strong bias magnetic field. The influence of the strong bias field is introduced, and the corresponding exciting input signal is selected. Magnetic reluctance estimation, approximate linearity between the strain and magnetic field, and a mass–spring–damper system assumption are employed to analyze the actuator’s displacement with low-frequency signal input. An experimental system is designed, and properties of the proposed actuator are tested. With the help of square wave test, appropriate direction of exciting signal for the magnetostrictive actuator is determined. With the help of sinusoidal wave test, the established model is validated and the relationship between the maximum value of the displacement and of the current is analyzed. With exciting frequency lower than 200 Hz, the errors between the calculating and testing results are within 1.0 m, which validates the model.

The Factors Influcing Energy Transfer Efficiency of Micro-Actuator

2012 ◽  
Vol 197 ◽  
pp. 808-813
Author(s):  
Ai Qun Xu
Keyword(s):  
Magnetic Field ◽  
Energy Transfer ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Bias Magnetic Field ◽  
Micro Actuator ◽  
The Relationship

Micro-actuators using giant magnetostrictive material as the core of drive components are becoming more and more widely used in the field of precise micro-actuator. In order to improve the energy transfer efficiency of the micro-actuator, reduce energy losing as heat and improve the working accuracy of micro-actuator.The relationship of pre-compression stress, magnetoconducivity and electromechanical coupling factor has been analyzed in the theory; A reasonable composition form of bias magnetic field has been put out; The relationship between bias magnetic field and electromechanical coupling factor has been analyzed; The configuration and size of coils have been optimized; The relationship between bias magnetic field and electromechanical factor has been discussed and experiments on correlative fields have been accomplished. When GMM is driven by constant magnetic field, measures like optimizing pre-compression stress, configuration and size of coils can be taken to improve giant magnetostrictive energy transfer efficiency and working performance of micro-actuator so that the driving performance can reach the best.

MODEL AND EXPERIMENTAL STUDY OF GIANT MAGNETOSTRICTIVE POWER GENERATION

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2374-2379
Author(s):  
Z. H. WANG ◽  
B. W. WANG ◽  
Y. F. YI ◽  
M. W. WANG ◽  
Y. B. WANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Power Generation ◽  
Electromagnetic Induction ◽  
Output Voltage ◽  
Coupling Model ◽  
Bias Magnetic Field ◽  
Power Generator ◽  
Mechanical Coupling ◽  
Giant Magnetostrictive Material ◽  
The Relationship

A mathematical model of vibration power generation (VPG) with the giant magnetostrictive material (GMM) is proposed on the basis of the magneto-mechanical coupling model, Jiles-Atherton model and electromagnetic induction law. According to the model, the output voltage of a giant magnetostrictive power generator has been calculated under the condition of different vibration frequency, pre-stress and bias magnetic field. The calculating results show that the model can reveal the relationship between the input vibrating stress and output voltage. The experiment of a giant magnetostrictive power generator has been carried out, and the experimental results agree well with the calculating results.

The relationship between the fatigue damage and the group speed of guided waves in the steel wire

2020 ◽  
Vol 64 (1-4) ◽  
pp. 541-547
Author(s):  
Zhihao Zhang ◽  
Jiang Xu ◽  
Yong Li
Keyword(s):  
Cyclic Loading ◽  
Fatigue Damage ◽  
Exponential Function ◽  
Calibration Curve ◽  
Guided Waves ◽  
Steel Wire ◽  
Group Speed ◽  
The Relationship

Failure of the cables can cause a bridge to collapse. Fatigue damage of steel wire is one of the causes of cable failure. In this paper, we study the relationship between the fatigue damage and the group speed of guided waves in the steel wire. The relationship between cyclic loading times and group speed of steel wire is obtained by applying tension to steel wire. The results show that the group speed of guided waves increases linearly before the 6.02 million cyclic-loading times, increases exponentially from 6.02 to 6.97 million times. The curve of the relationship between the group speed of the guided waves and the number of cyclic loading times can be fitted to an exponential function, and this curve can be used as a calibration curve to evaluate the fatigue damage of steel wire.

A flexural mode guided wave transducer for pipes based on magnetostrictive effect

2020 ◽  
Vol 64 (1-4) ◽  
pp. 335-342
Author(s):  
Yun Sun ◽  
Jiang Xu ◽  
Chaoyue Hu ◽  
Guang Chen ◽  
Yunfei Li
Keyword(s):  
Magnetic Field ◽  
Guided Waves ◽  
Permanent Magnets ◽  
Wave Structure ◽  
Guided Wave ◽  
Circumferential Direction ◽  
Bias Magnetic Field ◽  
Flexural Mode ◽  
Axial Crack ◽  
Wave Transducer

The flexural mode guided waves of pipes which are sensitive the axial crack and suitable for wave focused gain more attention recently. In this paper, a non-contact flexural mode guided wave transducer based on magnetostrictive effect is provided for pipes. Based on the magnetostrictive transduction principle and the wave structure of the flexural mode guided wave, the sensing method for generating and receiving the flexural mode guided waves based on magnetostrictive effect is obtained. According to the theoretical analysis, a non-contact magnetostrictive transducer for F (3, m) mode guided waves is given. Six permanent magnets which are evenly distributed in the circumferential direction of the pipe and arranged in opposite polarities are employed to provide the bias magnetic field in the circumferential direction. A solenoid coil is employed to induce the axial alternating magnetic field. The bias magnetic field distribution of the flexural mode guided wave in the pipeline is analyzed by the finite element simulation. The mode of the transduction guided wave in the pipe is verified by experiments based on the dispersion curves.

scholarly journals The use of a magnetic flux leakage in the assessment of the technical state of a steel wire rope subjected to bending

2018 ◽  
Vol 48 (1) ◽  
pp. 493-513
Author(s):  
Paweł Mazurek ◽  
Jerzy Kwaśniewski ◽  
Maciej Roskosz ◽  
Ryszard Siwoń-Olszewski
Keyword(s):  
Magnetic Field ◽  
Steel Wire ◽  
Wire Rope ◽  
Technical State ◽  
Magnetic Flux Leakage ◽  
Wire Ropes ◽  
State Of Stress ◽  
Real Objects ◽  
The Relationship ◽  
Flux Leakage

Abstract The technical state of steel wire ropes has a decisive impact on the safety of people using the equipment in which they are installed. The basis for increasing safety is the ability to assess the condition of the working steel wire. The article presents the use of magnetometric sensors to determine the relationship between the number of steel wire rope bends and its magnetic field induction value. This knowledge, referred to ropes working on real objects, allows to determine the state of stress prevailing in them as well as their condition.

Magnetoelectric Effect of the Ba0.80Sr0.2TiO3-CoFe2O4 Ceramic Composites by Molten-Salt Synthesis Method

2012 ◽  
Vol 268-270 ◽  
pp. 63-66
Author(s):  
Wei Rao ◽  
Ding Guo Li ◽  
Hong Chun Yan
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Molten Salt ◽  
Coupling Coefficient ◽  
Magnetoelectric Effect ◽  
Synthesis Method ◽  
Ceramic Composites ◽  
Molten Salt Synthesis ◽  
Interfacial Coupling ◽  
Bias Magnetic Field

This paper presents the structural, ferroelectric, ferromagnetic, resonance and magnetoelectric (ME) properties of multilayered ME composites fabricated using molten-salt synthesis method. The compositions corresponding to CoFe2O4 (CFO) with particle size of ~ 150 nm and Ba0.8Sr0.2TiO3 (BST) with particle size of ~ 100 nm were chosen as ferromagnetic and ferroelectric phases. The largest direct magnetoelectric (DME) and converse magnetoelectric (CME) coefficients of the multilayered ME composite were, respectively, 36 μV/cm•Oe at a bias magnetic field of 2800 Oe and 1.16×10-3G/V at a frequency of 30 kHz. In addition, the corresponding interfacial coupling coefficient was calculated to be 3.2×10-5. For the multilayered ME composite, the resonance frequency of 4.97 MHz and bandwidth of 30 kHz were obtained using capacitance-frequency spectrum method.

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