Using these design principles and steps,a torsional pendulum of the magnetometer was designed. The inherent frequency and the static distortion of this design module were simulated in ANSYS. It can be seen that the designing results from the proposed method are in good accordance with the simulation results,which validate the reliability of the model and the rationality of the designing method.
3.The vibration modal analysis of the wind turbine blade are presented . Theresults of the nature frequency and vibration are obtained, and we can configure thenature vibration characteristic of impeller blade and the tower structure system,keeping away from the impeller frequency when impeller run, controlling thevibration response of the tower system.
The test principle,instruments used and measured information are presented. Using the modern Fourier analyzer and its mode analyzer system,the measured value of nature frequency and damper coefficient of the stator core are accurate.
In order to accurately measure and recorder various measured signals, we ought tocorrectly select the nature frequency, damping of oscillators and magnitude of the measured signalsource matching with internal resistance rg of oscil1ator. We also properly adjust the posit1on of thelight dots, so that the arc errors are reduced.
Firstly,the simple equivalent physical model is built. Then,the second type of the Lagrange formula is established on the basis of the energy method of the multi-freedom-degree system. The spatial model without damp composed of inertia matrix [ M ] and rigidity matrix [ K ] is established to obtain the multi-order free frequency in different directions of the closed bus wire.
This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT).
The natural frequency reached 1.201-kHz using finite element analysis, and the practice measurement result was 1-kHz.
Using the differentials of a stiffness matrix to design parameters, a method for calculating the sensitivity of natural frequency is presented.
Through the mode analysis of the liquid-solid coupled system, the first-order natural frequency, diaphragm vibration shape and amplitude-frequency relationship are obtained.
The natural frequency of the system was less than that of the structure on rigid foundation if the SSI is not taken into account, while its damping ratio was larger than that of the structure.
Code combining is used to exploit the multiple signal copies resulting from the inherent frequency diversity of spread spectrum.
Even though the gain due to selection in frequency selective channels is reduced compared to that in flat fading channels due to the inherent frequency diversity, the performance improvement is significant when the system is interference limited.
Each device operates at some inherent frequency, with wide variation among devices.
The windowing helps by reducing the inherent frequency broadening of each interferer caused by the finite duration of the FFT.
The local-ether wave equation incorporating a nature frequency and the electric scalar potential is presented, from which the electrostatic force in conjunction with the inertial mass is derived.
It is found that, with the flow velocity increased, the nature frequency of the pipes reduced, increased, reduced again and so on.
Meanwhile the third-order approximate analytic expression is given for describing the nonlinear relation between nature frequency and peripheral moment, transverse loads, amplitude, base angle under the small deformation.
Changing from case 1 to case 2, the overall bridge system becomes softer which makes the nature frequency smaller.
For example, if a structure is damaged locally, its stiffness will decrease which lead to nature frequency decrease and damping increase.
The averaging is performed in the neighborhood of the critical free frequency of a nonlinear system.
The results, in particular, provide a key to understanding the particle acceleration process in relativistic accelerators near the critical free frequency.
We find that the corrections increase with the cut-off frequency and become negligible when the ratio between the Einstein coefficient of spontaneous emission and the free frequency of the two-level system is considerably small.
A?modulation-free frequency stabilization system has been designed which uses the differential signal from two frequency-displaced beams traversing a Rb cell and which probe the Doppler-broadened Rb S-P lineshape at microwatt power levels.
When optimized this way, the frequency modulation transfer signal can be used for the sensitive optical detection of rare species or isotopes, Doppler-free frequency measurements or as a sensitive error signal for laser frequency stabilization.