scholarly journals Structural Solutions that Increase the Dynamic Accuracy of a Wave Solid-State Gyroscope

2021 ◽  
Vol 12 (2) ◽  
pp. 146-155
Author(s):  
D. M. Malyutin
Keyword(s):  
Information Processing ◽  
Solid State ◽  
Measurement Error ◽  
Angular Velocity ◽  
Phase Lag ◽  
Dynamic Accuracy ◽  
First Case ◽  
Piezoelectric Elements ◽  
Dynamic Errors ◽  
Structural Solutions

The development of wave solid-state gyroscopes (VTG) is one of the promising areas of development of gyroscopic angular velocity sensors. VTG from the standpoint of manufacturing technology, tuning and control systems, as well as accuracy characteristics, has a number of advantages compared to other types of gyroscopes. When developing VTG, they strive to reduce the gyroscope's own care, zero signal bias, and the non-linearity of the scale factor in the operating temperature range However, when creating the device, due attention is often not paid to the existing opportunities to improve the dynamic accuracy of the gyroscope by developing promising structural solutions for building control circuits and information processing. The solution to this problem was the goal of the work.Using the methods of the theory of automatic control, the dynamics of a wave solid-state gyroscope with a metal resonator and piezoelectric elements in the closed-loop mode of Сoriolis acceleration compensation are studied. Piezoelectric elements perform the functions of displacement and force sensors.Two promising structural solutions for constructing VTG control and information processing circuits are proposed and considered. Relations are established for selecting the parameters of the links of these contours, which provide an increase in the dynamic accuracy of the gyroscope. In the first case, the proposed structure for constructing the VTG allows us to significantly reduce the dynamic errors caused by the difference in the scale coefficient of the VTG at different frequencies of the measured angular velocity in the bandwidth. Such a structure for constructing a VTG can be recommended when solving a measurement problem in which it is necessary to accurately measure the angular velocity, and the phase lag of the output signal in relation to the measured angular velocity is of secondary importance. In the second case, the proposed structure of the VTG construction corresponds to the transfer function of the relative measurement error with secondorder astatism, and the absolute measurement error in the frequency band of 10 Hz does not exceed 0.1 %.

Study on Dynamic Accuracy of CNC in Aviation Part

2011 ◽  
Vol 314-316 ◽  
pp. 1717-1720
Author(s):  
Li Du ◽  
Wei Wang ◽  
Zhi Yong Song ◽  
Jie Xiong Ding
Keyword(s):  
High Speed ◽  
Influence Factors ◽  
Maximum Error ◽  
Error Sources ◽  
Dynamic Accuracy ◽  
Cutting Test ◽  
Manufacture Process ◽  
Shape Precision ◽  
Dynamic Errors ◽  
And Control

Thin-walled parts are widely used in aerospace engineering. For their complexity under loading and the higher shape precision, it’s difficult for their manufacturing on high speed machine. In order to understand manufacture process, characteristic of aviation part in high speed machining is investigated. Error sources on parts are classified and the maximum error, dynamic errors are studied on its main influence factors, such as cutting force and vibration. Finally, useful method on cutting test part is proposed, which can observe and control dynamic accuracy of aviation part and ensure effective manufacture.

Plasmas: A New Class of Motion-Induced Brightness Illusion

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 16-16 ◽  
Author(s):  
P Tse
Keyword(s):  
Angular Velocity ◽  
Visual Angle ◽  
White Background ◽  
Phase Lag ◽  
High Background ◽  
Computer Screen ◽  
Dark Background ◽  
New Class ◽  
Black Cross ◽  
Dark Figure

When a white figure is set in smooth continuous motion against a dark background, a ‘shadowy’ region forms around and behind it, somewhat similar to the wake that a boat leaves in water. Conversely, when a dark figure moves against a white background, this ‘wake’ appears lighter than the background. When several such figures move, these ‘wakes’ can link up in surprising ways. For example, if four white circles of radius r are positioned on a dark background at the vertices of an imaginary square whose width is, say, 4 r, and this imaginary square rotates about its centre, bands darker than the background form between the four circles, linking them through the centre. This ‘black cross’ is nonrigid, and is accompanied by dark ‘wakes’ on the outside of the circles. I call these illusory brightness regions ‘plasmas’. The relation of this effect to other motion-induced brightness illusions is considered. In particular, this effect has different properties than either induced gratings (McCourt, 1982 Vision Research22 119 – 134) or phantom gratings (Tynan and Sekuler, 1975 Science188 951 – 952). Plasmas are not due to retinal afterimages or persistence, since they form in regions never traversed by the moving figure. Nor are they an artifact of the computer screen, since the illusion occurs equally well in displays constructed from paper. Plasmas have the opposite phase relative to the inducing figure, disappear when a figure stops moving, are strongest at high background/inducer contrast, and are most visible when the luminance of the inducers is in the photopic range. Experiments measuring the strength of plasmas as a function of angular velocity and visual angle are described. A model is proposed according to which plasmas are due to a phase lag in luminance-edge induced lateral inhibition.

scholarly journals A Solid-State Wave Gyro with Independent Channels for Measuring the Angle and Angular Velocity

2020 ◽  
Vol 18 (4) ◽  
pp. 21
Author(s):  
R. V. Melnikov ◽  
G. A. Trutnev ◽  
A. V. Krivov ◽  
I. R. Kadyrov
Keyword(s):  
Solid State ◽  
Angular Velocity ◽  
State Wave

В работе рассматривается новый перспективный принцип работы твердотельного волнового гироскопа (ТВГ) – одновременная работа прибора в режимах свободных и вынужденных колебаний на независимых формах колебаний. Режим свободных колебаний реализует датчик угла (ДУ), режим вынужденных колебаний формирует датчик угловой скорости (ДУС). Режим ДУ и ДУС являются независимыми каналами инерциальной информации. Режим ДУС реализует измерения мгновенной угловой скорости, но имеет большие погрешности вычисления угла поворота на длинном интервале времени при работе прибора в условиях вибраций и ударов. Режим ДУ реализует устойчивое физическое интегрирование угловой скорости (эффект Брайана) в любых условиях внешних механических воздействий на длинных интервалах времени, но имеет большие погрешности в определении мгновенной угловой скорости. Достоинством ДУ является широкий динамический диапазон, датчик работает в диапазоне угловых скоростей до нескольких тысяч градусов в секунду, с угловыми ускорениями до нескольких десятков тысяч градусов в секунду в квадрате. Динамический диапазон режима ДУС существенно меньше. Режим ТВГ с одновременной независимой работой в режимах ДУ и ДУС расширяет сферу применения ТВГ, одновременно повышает надежность, точность измерений, а также увеличивает устойчивость к внешним возмущениям. В области навигации и управления движением актуальным направлением является разработка прецизионных систем, обладающих высокой точностью определения мгновенной угловой скорости, широким динамическим диапазоном и устойчивостью интегрирования угловой скорости на длительных временных промежутках. Одна из попыток справиться с одновременными требованиями к точности и робастности – это разработка двухрежимного ТВГ, переключающего режимы в зависимости от требований. Существенным недостатком двухрежимного переключающегося ТВГ является наличие переходных процессов при переключении режимов, во время которого не происходит адекватного  измерения вращения. Также отсутствуют четкие критерии переключения режимов. Предлагается принципиально другой подход: разработка ТВГ, в котором два режима совмещены одновременно. Разделение режимов предлагается осуществлять не по времени, а по частоте. В резонаторе формируется не менее двух форм колебаний на своих резонансных частотах. Колебания по одной из форм используются для режима ДУ, другая форма используется для режима ДУС. Тем самым достигается формирование двух независимых каналов и получение преимуществ обоих режимов.

(Solid state) cavity QED for quantum and classical information processing

2011 ◽  
Author(s):  
Jelena Vuckovic ◽  
Arka Majumdar ◽  
Erik Kim ◽  
Michal Bajcsy ◽  
Alexander Papageorge ◽  
...  
Keyword(s):  
Information Processing ◽  
Solid State ◽  
Cavity Qed ◽  
Classical Information

Dynamic accuracy of the electromagnetic flowmeter

1965 ◽  
Vol 20 (1) ◽  
pp. 142-147 ◽  
Author(s):  
M. F. O'Rourke
Keyword(s):  
Magnetic Field ◽  
Pulsatile Flow ◽  
Output Signal ◽  
Oscillatory Flow ◽  
Electromagnetic Flowmeter ◽  
Sine Wave ◽  
Dynamic Calibration ◽  
Phase Lag ◽  
Dynamic Accuracy ◽  
Sinusoidal Flow

Dynamic calibration of electromagnetic flowmeters was performed by resolving the output signal when sinusoidal flow of known characteristics was pumped through the probe. In two instruments amplitude and phase were found to be frequency dependent in the range 0–20 cycle/sec; the magnitude of these effects was not insignificant as many have assumed. In a sine wave instrument using a variety of probes, both amplitude and phase increased linearly with frequency: the former increasing by 0.57% per cycle per second, the latter by 3.6° per cycle per second. In the square wave flowmeter at 0 damping, amplitude decreased significantly above 5 cycle/sec, while phase lag increased by 4.9° per cycle per second. These effects are concluded to be due to the output filtering network. In the sine wave instrument it was demonstrated that magnetic field nonuniformity within the probe did not alter the accuracy in recording steady or oscillatory flow. It was thus possible to construct a small short flowmeter probe having narrow electromagnet coils, and it is expected that this probe should cause minimal interference to pulsatile flow patterns. magnetic fields flowmeter probes; frequency-response flowmeter Submitted on April 16, 1964

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