Determination of an hydraulic motor's minimum rotation-frequency stability

1978 ◽  
Vol 21 (12) ◽  
pp. 1675-1677
Author(s):  
V. M. Petukhov ◽  
F. G. Pruglov
Keyword(s):  
Rotation Frequency ◽  
Frequency Stability

scholarly journals Frequency and temperature control for complex system engineering in optoelectronics and electronics: an overview

2020 ◽  
Vol 11 ◽  
pp. 7 ◽  
Author(s):  
Patrice Salzenstein
Keyword(s):  
Complex System ◽  
Temperature Control ◽  
Frequency Stability ◽  
Optical Components ◽  
Optical Signals ◽  
Microwave Oscillators ◽  
Measurement Results ◽  
Physical Principles ◽  
Control Complex

To take advantage of the physical principles of determining parameters, such as frequency stability, noise and also alignment of optical signals, it is necessary to control complex systems. This work allows explaining it through various concrete cases such as the determination of phase noise of microwave oscillators, the control of the temperature of the manufacturing process of optical components. We also discuss the estimation of the uncertainty associated with the measurement results, as it is fundamental to control the error range.

scholarly journals Determination of Controllers Constraints for Frequency Stability in an Islanded Microgrid

2012 ◽  
pp. 822-825
Author(s):  
M. Kohansal ◽  
G.B. Gharehpetian ◽  
M. Abedi ◽  
M.J. Sanjari
Keyword(s):  
Frequency Stability ◽  
Islanded Microgrid

scholarly journals The investigation of the kinetics of hydrochemical oxidation of metal sulphides with the aim of determination of the optimal conditions for the selective extraction of molybdenum from ores

2005 ◽  
Vol 41 (1) ◽  
pp. 33-45 ◽  
Author(s):  
V. Lutsik ◽  
A. Sobolev
Keyword(s):  
Rotation Frequency ◽  
Rotating Disk ◽  
Selective Extraction ◽  
Solution Temperature ◽  
Specific Rate ◽  
Disk Rotation ◽  
Diffusion Controlled ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

The kinetics of the oxidation of molybdenyte, pyrite and sphalerite in solutions of nitric acid, hydrogen peroxide, and sodium hypochlorite was studied by the rotating disk method. The influence of the molar concentration of reagent, pH of solution, temperature, disk rotation frequency, and duration of measurements on the specific rate of hydrochemical oxidation of sulpfides was determined. The kinetic models allowing to calculate the dissolution rate of sulphides when these parameters change simultaneously were obtained. The conditions of kinetically and diffusion-controlled processes were detected. The details of mechanism of the studied processes were revealed. The nature of intermediate solid products, the reasons and the conditions of their formation as well as the character of their influence on the kinetics of dissolution processes were determined. The probable schemes of interactions corresponding to the observable kinetic dependences were offered. The conditions of the effective and selective molybdenum leaching directly from ore without its concentration were found.

scholarly journals Derivation of the Rotational Frequency of Massive Stars from Seismic Studies

2004 ◽  
Vol 215 ◽  
pp. 199-204 ◽  
Author(s):  
C. Aerts ◽  
R. Scuflaire ◽  
A. Thoul
Keyword(s):  
Main Sequence ◽  
High Spatial Resolution ◽  
Massive Stars ◽  
Accurate Determination ◽  
Rotation Frequency ◽  
Rotational Frequency ◽  
Current Status ◽  
B Stars ◽  
Made In

In this contribution we review the current status of the determination of the rotational frequency in non-radially pulsating B stars, i.e. β Cep stars and slowly pulsating B stars. Considerable progress is currently being made in the understanding of the non-radial oscillations of main-sequence B stars by means of high-temporal, high-spatial resolution spectroscopic time series. This has led to the detection of frequency multiplets, which are interpreted as rotationally splitted non-radial modes and which allow an accurate determination of the surface rotational frequency in some stars. We outline how our future goal, i.e. the derivation of the internal rotation frequency, can be achieved.

DISTANCE MEASUREMENTS USING FREQUENCY STABILIZED Nd:YAG LASERS

1996 ◽  
Vol 05 (03) ◽  
pp. 543-550
Author(s):  
VERED MAHAL ◽  
ADY ARIE
Keyword(s):  
Frequency Stability ◽  
Precise Determination ◽  
Phase Shifting ◽  
Distance Measurements ◽  
Fringe Contrast ◽  
Nd:Yag Lasers ◽  
Wide Range ◽  
Diode Pumped ◽  
Selection Of

Two diode-pumped tunable Nd:YAG lasers locked to sub-Doppler transitions of 127I2 and 133 Cs 2 are used as a source for two-wavelength interferometry. The synthetic wavelength, Λ=c/∆ν, is highly stable and accurate, owing to the frequency stability of the locked lasers and the precise determination of the frequency difference Δν between Cs 2 and I 2 transitions. The dense spectra of these molecules allows selection of Λ over a wide range, between 8.5 mm and several meters, thus enabling distance measurements with a large non-ambiguity range. Fringe contrast and phase-shifting methods are used to measure the phase difference. An accuracy of 70 μm is achieved for Λ~19 mm, i.e. Λ/260.

Manifestation of Berry’s Phase in Nuclear Quadrupole Resonance Spectra of Rotating Powder Samples

2008 ◽  
Vol 63 (1-2) ◽  
pp. 81-87 ◽  
Author(s):  
Nikolay Sinyavsky ◽  
Mariusz Maćkowiak ◽  
Claudia Schmidt
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Asymmetry Parameter ◽  
Rotation Frequency ◽  
Berry's Phase ◽  
Berry’S Phase ◽  
Sample Rotation ◽  
Quadrupole Resonance ◽  
Powder Samples ◽  
Nuclear Quadrupole

The effect of Berry’s phase on the nuclear quadrupole resonance (NQR) spectra of rotating powder samples is studied experimentally, and its application for the determination of the electric field gradient asymmetry η is demonstrated. The NQR frequency splittings, which are observed for the spin 3/2 nucleus of 35Cl in powder samples of p-dichlorobenzene (C6H4Cl2) and cyanuric chloride (C3N3Cl3), are interpreted as a manifestation of Berry’s phase, associated with the adiabatically changing Hamiltonian due to sample rotation. The accumulation of Berry’s phase during the rotation process is responsible for the observed dependence of the NQR line shape on the rotation frequency and the asymmetry parameter. The proposed method for the determination of η involves the analysis of the NQR powder patterns of the rotating samples.

scholarly journals Dependence of Dowel Joint Strength on Welding Temperature in Rotary Welding

2021 ◽  
Vol 72 (2) ◽  
pp. 169-178
Author(s):  
Ivica Župčić ◽  
Ivan Žulj ◽  
Ivica Grbac ◽  
Kristijan Radmanović
Keyword(s):  
Joint Strength ◽  
Rotation Frequency ◽  
Precise Determination ◽  
Future Research ◽  
Transfer Model ◽  
Weld Penetration ◽  
Welding Temperature ◽  
Dowel Joint ◽  
The Impact

The system for measuring the welding temperature with measuring probes has been developed for the requirements of this but also of future research (at the Faculty of Forestry and Wood Technology, University of Zagreb). The research is based on determining the welding temperature and its impact on the joint strength or the embedded force of the dowel. Based on research results, the impact of the dowel rotation frequency and temperature on the joint strength has been determined. The measured welding temperature increased as the rotation frequency increased (the rotation frequencies of 865 min-1 and 1520 min-1 were used in the research). The maximum welding temperature in pine samples welded at the rotation frequency of 1520 min-1 amounts to 217 °C, while in samples welded at the rotation frequency of 865 min-1 it amounts to 179 °C (weld penetration of 20 mm). The maximum welding temperature in beech samples welded at the rotation frequency of 865 min-1 amounts to 181 °C, and 213 °C at the rotation frequency of 1520 min-1 (weld penetration of 20 mm). The impact of the wood type on the welding temperature has not been proven. In order to avoid difficulties encountered in contact measurement of the welding temperature, a heat transfer model was developed for a more precise determination of the welding temperature.

scholarly journals Experimental determination of the energy efficiency of rotors of vertical-axis wind turbines for autonomous power supply on land and at sea

2018 ◽  
Vol 245 ◽  
pp. 06016 ◽  
Author(s):  
Nikolai Shishkin ◽  
Roman Il’in
Keyword(s):  
Power Supply ◽  
Experimental Studies ◽  
Rotation Frequency ◽  
Vertical Axis ◽  
Geometrical Parameters ◽  
Horizontal Axis Wind Turbine ◽  
A Value ◽  
First Time ◽  
Supply Systems

For the first time, experimental studies have been performed to assess the effect of flaps with triangular elements on the operation of the N-Darrieus and Savonius rotors. It has been established that the rotational speed of the original N-Darrieus and Savonius rotors having blades with flaps is greater than the rotation frequency of the N-Darrieus and Savonius rotors of the known construction by 18%, and the power factors of the N-Darrieus and Savonius rotors are for 17% and 19% more. Optimization of the geometrical parameters of the blades can lead to an increase in the power factor of the N-Darrieus rotor up to a value of 0.72, which is higher than the maximum possible value of 0.45 for the horizontal axis wind turbine. It is advisable to aggregate N-Darrieus rotors with Savonius rotors having a large starting torque. The upgraded N-Darrieus and Savonius rotors, as well as the combined rotors based on them, can be used in power supply systems for various objects on land and at sea.

Mathematical Model of Dynamic-Kinematic Error of a Harmonic Drive

2021 ◽  
pp. 48-54
Author(s):  
I.E. Lyuminarsky ◽  
S.E. Lyuminarsky ◽  
V.V. Balasanyan
Keyword(s):  
Mathematical Model ◽  
Frequency Response ◽  
Rotation Frequency ◽  
Elastic Interaction ◽  
Gear Train ◽  
Kinematic Error ◽  
Resonant Frequencies ◽  
Urgent Task ◽  
Wave Generator

Reducing the kinematic error when designing a high-precision drive with a harmonic gear train (HGT) is an urgent task. Currently, a large number of studies have been conducted to determine this parameter, but the effect of the wave generator rotation frequency on the kinematic error of the HGT has been considered insufficiently. A mathematical model is proposed for determining the frequency response of the HGT dynamic-kinematic error, taking into account the elastic interaction of its elements and the error of the cam mounting. The results of the calculated determination of the frequency response of a HGT with a cam wave generator are presented. The presence of several resonant frequencies that occur due to periodic changes in the relative position of the HGT elements and the vector of the cam mounting error is defined. It is proved that the two main resonant frequencies are caused by the rotation of the vector of the cam mounting error relative to the large axis of the wave generator and the balls of the flexible bearing.

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