scholarly journals Low-Frequency Vibration Sensor with a Sub-nm Sensitivity Using a Bidomain Lithium Niobate Crystal

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 614 ◽  
Author(s):  
Ilya Kubasov ◽  
Aleksandr Kislyuk ◽  
Andrei Turutin ◽  
Alexander Bykov ◽  
Dmitry Kiselev ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Vibration Sensor ◽  
Gravitational Acceleration ◽  
Frequency Sensor ◽  
Linear Behavior ◽  
Low Frequency Vibration ◽  
Acceleration Amplitude ◽  
Vibrational Excitations

We present a low-frequency sensor for the detection of vibrations, with a sub-nm amplitude, based on a cantilever made of a single-crystalline lithium niobate (LiNbO3) plate, with a bidomain ferroelectric structure. The sensitivity of the sensor-to-sinusoidal vibrational excitations was measured in terms of displacement as well as of acceleration amplitude. We show a linear behavior of the response, with the vibrational displacement amplitude in the entire studied frequency range up to 150 Hz. The sensitivity of the developed sensor varies from minimum values of 20 μV/nm and 7 V/g (where g = 9.81 m/s2 is the gravitational acceleration), at a frequency of 23 Hz, to peak values of 92.5 mV/nm and 2443 V/g, at the mechanical resonance of the cantilever at 97.25 Hz. The smallest detectable vibration depended on the excitation frequency and varied from 100 nm, at 7 Hz, to 0.1 nm, at frequencies above 38 Hz. Sensors using bidomain lithium niobate single crystals, as sensitive elements, are promising for the detection of ultra-weak low-frequency vibrations in a wide temperature range and in harsh environments.

An Ultra-Low Frequency Vibration Sensor Realized by Using the Magnetoelectric Speed Sensor

2013 ◽  
Vol 278-280 ◽  
pp. 704-708 ◽  
Author(s):  
Zhang Yi Yuan ◽  
Ke Dong ◽  
Yu Xia Qian
Keyword(s):  
Function Theory ◽  
Low Frequency ◽  
Vibration Sensor ◽  
Speed Sensor ◽  
Frequency Sensor ◽  
Low Frequency Vibration ◽  
Before And After ◽  
The Difference ◽  
Output Characteristics ◽  
Physical Phenomena

Ultra-low frequency vibrations are ordinary physical phenomena, and absolute vibrant sensors are usually used to detect them. The author presents a method that using magnetoelectric speed sensor to detect ultra-low frequency vibrations. With cascade correcting circuit, the lowest frequency that can be measured will be less than 0.5Hz while the best damping is maintained. The author has systematically analyzed the correcting circuit, transfer function, theory of operation, and the difference between output characteristics before and after correcting to the ultra-low frequency sensor.

205201 Study on Reduction of Residual Stress in Welded Joint Using Low Frequency Vibration : Effect of Excitation Frequency

2011 ◽  
Vol 2011.17 (0) ◽  
pp. 139-140
Author(s):  
Shigeru Aoki ◽  
Tadashi Nishimura ◽  
Tetsumaro Hiroi ◽  
Seiji Hirai ◽  
Katsumi Kurita ◽  
...  
Keyword(s):  
Residual Stress ◽  
Welded Joint ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Vibration Effect ◽  
Low Frequency Vibration

Research on the Performance of Cantilever Low Frequency Vibration Sensor Based on Thin-diameter Excessively Tilted Fiber Grating

2020 ◽  
Vol 49 (12) ◽  
pp. 42-50
Author(s):  
邹雪 Xue ZOU ◽  
邓欧 Ou DENG ◽  
罗彬彬 Bin-bin LUO ◽  
吴德操 De-cao WU ◽  
赵明富 Ming-fu ZHAO ◽  
...  
Keyword(s):  
Low Frequency ◽  
Vibration Sensor ◽  
Fiber Grating ◽  
Low Frequency Vibration

scholarly journals Dynamic Parameter Optimization and Experimental Study of Tuned Slab Damper on Metro Systems

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Guang-Hui Xu
Keyword(s):  
Parameter Optimization ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Dynamic Parameter ◽  
Complex Method ◽  
Low Frequency Vibration ◽  
Track System ◽  
Train Operation ◽  
Metro Systems ◽  
Set Up

With the increase of axle weight and speed, the interaction between vehicles and the track becomes more and more intense, and the problem of wheel-rail dynamic action is more serious. In order to reduce the low-frequency vibration caused by train operation, a three-layer elastic track damping structure is proposed. The complex method is used to optimize the dynamic parameters, structural patterns, and coupling relations of the track structure, which allows multiple elastic units to work in harmony with each other to achieve the effects of absorbing vibration energy and reducing vibration transmission. Finally, a real size model experimental platform is set up to verify the dynamic parameter optimization results. The results show that the vertical mode of the main track system of the coupling-tuned slab damper-floating slab is 26.898 Hz close to the train excitation frequency, and the corresponding equivalent mass is 6074.53 kg. The amplitude of the vibration components in the 20∼40 Hz band can be reduced to 41.8% by using the complex method. The maximum insertion loss is about 10 dB, and the vibration of low-frequency band is not amplified.

Broadband and Low Frequency Vibration-Based Energy Harvesting Improvement Through Magnetically Induced Frequency Up-Conversion

2010 ◽  
Author(s):  
Adam M. Wickenheiser
Keyword(s):  
Energy Harvester ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Beam Theory ◽  
Magnetic Interaction ◽  
Large Mass ◽  
Stochastic Simulations ◽  
Base Excitation ◽  
Low Frequency Vibration ◽  
Compact Design

In order to extract as much energy as possible from ambient vibrations, many vibration-based energy harvesters (VEHs) are designed to resonate at a specific base excitation frequency. Unfortunately, many vibration energy sources are low frequency (0.5 Hz–100 Hz), intermittent, and broadband. Thus, resonant VEHs would not be excited continuously and would require a large mass or size to tune to such a low frequency. This work presents the modeling, analysis, and experimental application of a nonlinear, magnetically excited energy harvester that exhibits efficient broadband, frequency-independent performance. This design utilizes a passive auxiliary structure that remains stationary relative to the base motion of the VEH. This device is especially effective for driving frequencies well below its fundamental frequency, thus enabling a more compact design compared to traditional resonant topologies. A mechanical model based on Euler-Bernoulli beam theory is coupled to a linear circuit and a model of the nonlinear, magnetic interaction to produce a distributed parameter magneto-electromechanical system. The results of both harmonic and broadband, stochastic simulations demonstrate multiple-order-of-magnitude power harvesting performance improvement at low driving frequencies and an insensitivity to time-varying base excitation frequency content. Furthermore, the proposed system is shown to enable more practical designs than a resonant energy harvester for the specific example of harvesting energy from walking motion.

Driving Wetting Transitions on Textured Surfaces Using Ultrasonic Vibration

2020 ◽  
Author(s):  
Matthew Trapuzzano ◽  
Nathan Crane ◽  
Rasim Guldiken ◽  
Andrés Tejada-Martínez
Keyword(s):  
Ultrasonic Vibration ◽  
Liquid Droplet ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Surface Topology ◽  
Liquid Droplets ◽  
Textured Surfaces ◽  
External Energy ◽  
Low Frequency Vibration ◽  
The Right

Abstract Adhesives, medical devices, and many cleaning products depend on the wetting of liquids on solid surfaces. The liquid/solid interaction depends on chemistry, surface topology, and external energy input. For instance, surfactants are commonly used in cleaning solutions to improve their effectiveness, and electrical fields are frequently used to control the contact angle of liquid droplets. Low frequency vibration has been used to spread, move, and manipulate droplets using the mode shape oscillations of the droplet to displace the contact line. Ultrasonic vibration (above 20 kHz) can also cause a liquid droplet to wet or spread out on a solid surface under the right circumstances. We have previously demonstrated that ultrasonic vibration can be used to control the wetting/spreading of liquid droplets on smooth hydrophobic surfaces and that the response is relatively insensitive to excitation frequency or fluid properties [1]. This paper reports on the use of ultrasonic vibration to initiate spreading on surfaces with etched pillars. Ultrasonic vibration successfully initiated a transition from Cassie to Wenzel states in all geometries with no apparent need to tune excitation frequencies to the geometry. However, the magnitude of the acceleration required to initiate the transition decreased with increased pillar spacing. For small pillar spacing, some smooth spreading in the Cassie wetting mode was observed before transition.

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