In this paper, the signal s strong non-stationary feature is demonstrated with time-frequency two-dimensional analysis by using the Wigner Distribution (WD) for pressure fluctuation signal in gas-solid fluidized beds.
The pressure fluctuation signal of the centrifugal pump inlet was analyzed and disposed by wavelet combined with autocorrelation analysis. The spectrum and energy of different scales of the inception cavitation signal were obtained.
The digital low pass filter method make it possible to decompose the turbulent fluctuating signal into two parts:one is the large scale eddies in which the coherent structures are expected to exist and the other is the small scale eddies that are nearly isotropy. But how to get rid of the noncoherent signal from the large scale part is still a problem to be solved.
For this problem, this discourse combining The Special Type Glue Pipe Workshop of South-West Rubber Factory designed and taken charged of construction by the author investigates its dynamical characteristic systemically, does some test in the field, collects ordinary time pulse signal of the workshop, takes the FFT change and receives the pulse Fourier spectrum and some related immanence vibration specialty.
We experimentely studied βe, because it is difficult to set accurately the value of βe. In the study we used interrelated analysis method to given the pressure pulse signal within hydraulic pipe and found variation regular of βe value with working pressure and temprature.
Flue gas pressure pulse signals and temperature pulse signals are analyzed to obtain the effects of flue gas velocity and temperature on the principal fluctuation frequency of gas flow, and further to choose a proper sensor.
Secondly, the temperature and pressure pulse signals of the high temperature flue gas, obtained by thermocouple and pressure sensor, are introduced to explain the applicability of sensor characteristics.
The transient pulse signal fidelity has also been investigated by finite-difference time-domain (FDTD) method.
The instrument was designed for the separation of a periodic pulse signal from noise and interference.
The circuit includes a wide-band dc amplifier with a differential input and a linear amplitude-frequency characteristic in the range of 0 to 2 × 106 Hz combined with a sample-and-hold circuit for controlling the dc component of a pulse signal.
Algorithms for the suppression of noise and detection of a pulse signal in both time and spectral areas stipulate the use of an analog-to-digital converter with a high resolution, allowing us to cover the dynamic range the signal and noise.
It is shown that the instantaneous frequency of the reflected pulse signal may substantially differ from the rated frequency of a piezoelectric transducer for different types of reflectors.
A data acquisition system containing up to four multichannel galvanically insulated modules capable of recording the shapes of single pulse signals is described.
It contains eight four-channel modules that record the shapes of single pulse signals, a controller module of the system bus of the crate, a fiber-optic communication line, and an interface card for connection to the ISA bus of a personal computer.
Characteristics of pulse signals transmitted in a multichannel information speed system widely used in physical setups of the State Research Center Institute of High-Energy Physics on a 70-GeV accelerator are studied.
A method of frequency measurements of pulse signals in the millimeter/submillimeter wavelength region, including signals with a pulse duration shorter than 10 μs and a repetition rate of 0.1 Hz, is considered.
Investigation on the automatic parameters extraction of pulse signals based on wavelet transform