(4)The practical measures show that: Stress of pipelines accords with national demand and peak value of vibration decreases from 1mm to 0.2mm, whereas the inherent frequency of each phase increased generally.
Let the inherent frequency, frequency of excitation force, vibration response of mechanical parts be processed according to reality into random variables, by means of combining relevant optimization technique, reliability theory and fuzzy mathematics into an organic whole, and taking the traditional vibration designing method as a foundation, the fuzzy optimization designing method on machinery components based on reliability was put forward.
This paper calculates the intrinsic frequency of the free vibration of the thick-wall cylinder by using the energy principles based on the threedimensional elasticity theory. A very close agreement between the theoretical predication and the practical result is attained.
Through theoretical analysis against the main performance index intrinsic frequency of actuator on Electro hydraulic Servo Dynamic Testing Machine, this article has submitted how to improve the design method of the intrinsic frequency.
Based on Flgge's shell equations, a method for calculating the eigen-frequencie s and modal solution is derived for the travelling-wave resonance response of cy l indrical shells. A speed formula for the rotating cylindrical shells at resonant frequency is obtained.
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.
On this assumption, deviations of the Zeitgeber-frequency from the intrinsic frequency of the dependent systems cause phase-angle differences between the two systems.
Also, with short and relatively weak intersegmental connections, the network remains robust against perturbations as well as intrinsic frequency differences along the chain.
The temporal variation of the tidal component of the wind changes the observed frequency, sometimes substantially, while leaving the intrinsic frequency unaltered.
The intrinsic frequency and vertical and horizontal wavelengths of gravity waves in the stratosphere are 2f-3f, where f is the Coriolis parameter, and 2-3?km and 300-500?km, respectively.
Numerical evidence is given here that the family of such orbits is a continuous function of the rotation frequency Ω which varies between Ω?=?0, for the planar figure eight orbit with intrinsic frequency ω, and Ω =?ω for the circular Lagrange orbit.
The simulated results show that FSS may operate in different bands and especially generate a large reduction in the resonant frequency for a fixed unit cell size through different loadings.
Because of coupling of the mechanical and magnetic effects, coupled magnetoacoustic oscillations of a wave nature develop in a certain (resonant) frequency region.
It is found that such a system possesses a rather interesting nontrivial property: under certain conditions it has a resonant frequency at which the rotation of the particles relative to the fluid is most intense.
The dependence of the resonant frequency on the tube length is investigated.
The technique involves measuring the resonant frequency and Q factor of a microwave cavity containing a poly-Si specimen, on which basis the relative permittivity εr and the dissipation factor tanδ are calculated.