scholarly journals Improvement of Tuning Fork Gyroscope Drive-mode Oscillation Matched using a Differential Driving Suspension Frame

2016 ◽  
Vol 6 (6) ◽  
pp. 2716
Author(s):  
Thang Nguyen Van ◽  
Tran-Duc Tan ◽  
Hung Vu Ngoc ◽  
Trinh Chu Duc
Keyword(s):  
Tuning Fork ◽  
Mechanical Vibration ◽  
Differential Amplifier ◽  
Drive Mode ◽  
Mechanical Vibrations ◽  
Amplifier Circuit ◽  
Differential Phase ◽  
Mode Oscillation ◽  
Novel Design ◽  
Suspension Frame

<p>This paper presents a novel design of a vibration tuning fork gyroscope (TFG) based on a differential driving suspension coupling spring between two gyroscopes. The proposed TFG is equivalent to a transistor differential amplifier circuit. The mechanical vibrations of driving frames are, therefore, well matched. The matching level depends on stiffness of spring. When three various TFG structures respond to differential stiffness of spring, their the driving frame mechanical vibration is well matched in case the input excitation driving differential phase is less than 3.5°, 2.5°, and 4°, respectively. The fabricated tuning fork gyroscope linearly operates in the range from -200 to +200 degree/s with the resolution of about 0.45 mV/degree/s.</p>

Improvement of Tuning Fork Gyroscope Drive-mode Oscillation Matched using a Differential Driving Suspension Frame

2016 ◽  
Vol 6 (6) ◽  
pp. 2716
Author(s):  
Thang Nguyen Van ◽  
Tran-Duc Tan ◽  
Hung Vu Ngoc ◽  
Trinh Chu Duc
Keyword(s):  
Tuning Fork ◽  
Mechanical Vibration ◽  
Differential Amplifier ◽  
Drive Mode ◽  
Mechanical Vibrations ◽  
Amplifier Circuit ◽  
Differential Phase ◽  
Mode Oscillation ◽  
Novel Design ◽  
Suspension Frame

<p>This paper presents a novel design of a vibration tuning fork gyroscope (TFG) based on a differential driving suspension coupling spring between two gyroscopes. The proposed TFG is equivalent to a transistor differential amplifier circuit. The mechanical vibrations of driving frames are, therefore, well matched. The matching level depends on stiffness of spring. When three various TFG structures respond to differential stiffness of spring, their the driving frame mechanical vibration is well matched in case the input excitation driving differential phase is less than 3.5°, 2.5°, and 4°, respectively. The fabricated tuning fork gyroscope linearly operates in the range from -200 to +200 degree/s with the resolution of about 0.45 mV/degree/s.</p>

scholarly journals Modal Analysis and Rotor-Dynamics of an Interior Permanent Magnet Synchronous Motor: An Experimental and Theoretical Study

2020 ◽  
Vol 10 (17) ◽  
pp. 5881
Author(s):  
Selma Čorović ◽  
Damijan Miljavec
Keyword(s):  
Modal Analysis ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Natural Frequencies ◽  
Permanent Magnet Synchronous Motor ◽  
Mechanical Vibration ◽  
Mechanical Vibrations ◽  
Wide Range ◽  
Interior Permanent Magnet ◽  
Interior Permanent Magnets

This paper investigates mechanical vibrations of an interior permanent magnet (IPM) synchronous electrical motor designed for a wide range of speeds by virtue of the modal and rotordynamic theory. Mechanical vibrations of the case study IPM motor components were detected and analyzed via numerical, analytical and experimental investigation. First, a finite element-based model of the stator assembly including windings was set up and validated with experimental and analytical results. Second, the influence of the presence of the motor housing on the natural frequencies of the stator and windings was investigated by virtue of numerical modal analysis. The experimental and numerical modal analyses were further carried out on the IPM rotor configuration. The results show that the natural frequencies of the IPM rotor increase due to the presence of the magnets. Finally, detailed numerical rotordynamic analysis was performed in order to investigate the most critical speeds of the IPM rotor with bearings. Based on the obtained results, the key parameters related to mechanical vibrations response phenomena, which are important when designing electrical motors with interior permanent magnets, are provided. The main findings reported here can be used for experimental and theoretical mechanical vibration analysis of other types of rotating electrical machines.

scholarly journals A Decoupling Design with T-Shape Structure for the Aluminum Nitride Gyroscope

Micromachines ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 244
Author(s):  
Yang ◽  
Si ◽  
Han ◽  
Zhang ◽  
Ning ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Microelectromechanical Systems ◽  
Sense Mode ◽  
Drive Mode ◽  
Aln Film ◽  
Shape Structure ◽  
Mems Gyroscopes ◽  
Sense Electrode ◽  
Working Principle ◽  
Novel Design

This paper reports a novel design for the decoupling of microelectromechanical systems (MEMS) gyroscopes. The MEMS gyroscope is based on piezoelectric aluminum nitride (AlN) film, and the main structure is a mass hung by T-shape beams. A pair of parallel drive electrodes are symmetrically placed on the surface of the vertical bar for driving the oscillating mass. A serpentine sense electrode is placed on the lateral bar. When the gyroscope is oscillating in drive mode, charges with equal quantity and opposite sign will be polarized and distributed symmetrically along the lateral bar. These charges neutralize each other at the sense electrode. Therefore, no coupling signals can be detected from the sense electrode. This design can realize the decoupling between the drive mode and sense mode. In this work, the T-shape decoupled structure was designed as the key component of an AlN piezoelectric gyroscope and the whole structure was simulated by COMSOL Multiphysics 5.2a. The working principle of the decoupling is described in detail. Electrical properties were characterized by the dynamic signal analyzer. According to the test results, the drive mode and the sense mode are decoupled. The coefficient of orthogonal coupling is 1.55%.

An Analysis of the Galvanometer Amplifier and its Response to Alternating Electromotive Forces and Mechanical Vibrations

1951 ◽  
Vol 4 (4) ◽  
pp. 560
Author(s):  
RG Wylie ◽  
AFA Harper
Keyword(s):  
Frequency Response ◽  
Response Curve ◽  
Mechanical Vibration ◽  
Frequency Response Curve ◽  
Mechanical Vibrations ◽  
Frequency Axis ◽  
Critical Damping

A system which is representative of most practical galvanometer amplifiers is analysed and the response of the system to alternating e.m.f.'s and to mechanical vibration is determined. It is shown that the values of the circuit constants can be so chosen that the galvanometer movement is at least critically damped for all conditions of operation and that, for critical damping. the frequency response curve for the amplifier to applied alternating e.m.f.'s resembles that for the galvanometer alone but is expanded along the frequency axis by a factor which depends on the degree of feedback. Mechanical vibration with a component about the axis of the galvanometer cod produces an effect which is markedly increased by the provision of feedback.

scholarly journals Optical Fiber Based Distributed Mechanical Vibration Sensing

2021 ◽  
Author(s):  
Vít Novotný ◽  
Petr Sysel ◽  
Aleš Prokeš ◽  
Pavel Hanák ◽  
Karel Slavíček ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Mechanical Vibration ◽  
Single Mode ◽  
Mechanical Vibrations ◽  
Real Situation ◽  
Optical Link ◽  
Distributed Sensor ◽  
Sensing System ◽  
System Components ◽  
Vibration Sensing

The distributed long-range sensing system using the standard telecommunication single-mode optical fiber in a function of a distributed sensor for sensing of mechanical vibrations is described. Various events generating vibrations such as walking or running person, moving cars, trains and others can be detected, localized and classified. The sensor and related sensing system components were designed and constructed and the system was tested both in the laboratory and in the real situation with 88 km telecom optical link, and the results are presented.

scholarly journals Novel design for differential phase shifter structure by using multi‐section coupled lines

2020 ◽  
Vol 56 (11) ◽  
pp. 553-556
Author(s):  
M.D. Geyikoglu ◽  
H. Koc Polat ◽  
B. Cavusoglu
Keyword(s):  
Phase Shifter ◽  
Differential Phase ◽  
Coupled Lines ◽  
Novel Design

A Multiple-Beam Tuning-Fork Gyroscope With High Quality Factors

2009 ◽  
Author(s):  
Ren Wang ◽  
Shiva Krishna Durgam ◽  
Zhili Hao ◽  
Linda Vahala
Keyword(s):  
Tuning Fork ◽  
Rate Sensitivity ◽  
Sense Mode ◽  
Quality Factors ◽  
Drive Mode ◽  
High Quality ◽  
Multiple Beam ◽  
Frequency Split ◽  
Operation Frequency ◽  
Mask Fabrication

This paper reports on the design, fabrication, and testing of a multiple-beam tuning-fork gyroscope featuring high Quality factors (Q). A multiple-beam tuning-fork structure is designed to achieve high Qs in its drive mode and sense mode. The gyroscope is fabricated on a 30μm-thick SOI wafer using a one-mask fabrication process. The measured Qs of the fabricated gyroscope are 162,060 in the drive-mode and 85,168 in the sense mode at an operation frequency of 16.8kHz. Under a frequency split of 6Hz, the prototype device demonstrates a rate sensitivity of 0.02mV/°/sec.

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