Based on Bernoulli equation, nonlinear differential equation for dynamic internal pressure is derived and random vibration theory combined with iteration algorithm is used to obtain the solution. Numerical examples are provided to investigate frequency response characteristic of internal pressure and the influences of opening ratio, opening number and opening position on fluctuating internal pressure.

Based on Bernoulli equation, nonlinear differential equation for dynamic internal pressure is derived and random vibration theory combined with iteration algorithm is used to obtain the solution. Numerical examples are provided to investigate frequency response characteristic of internal pressure and the influences of opening ratio, opening number and opening position on fluctuating internal pressure.

It is shown that diffusants which take part in surface reactions of finite rate or are subject to reversible trapping within the solid have a frequency response characteristic of the process involved.

A composite method to determine the tapping coefficients along with the coefficients of the subfilter to approximate overall frequency response characteristic is proposed.

Theoretical studies have been made on the effective ionization rates of electrons and holes of the device, I-V characteristic and the frequency response characteristic of the AlxGa1-xAs/GaAs superlattice p+-i-n+ structure.

Probe bandwidth refers to the frequency response characteristic of a probe and specifies the normal operating frequency range of the probe.

In contrast to this, phonograph preamp circuits not only scale the signal, they also impart a specific frequency response characteristic to it.

By the Hamilton’s principle, this paper presents a generalized formulation for modeling the system with passive piezoelectric shunt circuit. It is applicable to various structures and shunt circuits. Formulations of single-degree-of-freedom system for four types of piezoelectric shunt circuits, R-shunt –circuit, L-shunt –circuit, RL-series-shunt –circuit and RL-parallel-shunt –circuit, are obtained. The frequency response characteristics of the systems with these four passive piezoelectric shunt circuits...

By the Hamilton’s principle, this paper presents a generalized formulation for modeling the system with passive piezoelectric shunt circuit. It is applicable to various structures and shunt circuits. Formulations of single-degree-of-freedom system for four types of piezoelectric shunt circuits, R-shunt –circuit, L-shunt –circuit, RL-series-shunt –circuit and RL-parallel-shunt –circuit, are obtained. The frequency response characteristics of the systems with these four passive piezoelectric shunt circuits are analyzed by numerical methods, and the effect of electrical and mechanical parameters on the system response is also investigated. Several conclusions and some problems to be studied in the future are highlighted.

The spatial filtering fundamental theory of electrodynamic sensor is introduced and its spatial filtering property is also analyzed quantitatively in the paper.Further,the temporal frequency response characteristics of electrodynamic sensor are derived and the experimental test results on a gravity-fed conveyor are presented.Theoretical and experimental results obtained demonstrate that electrodynamic sensor acts as a low-pass filter in the spatial frequency domain and the spatial frequency...

The spatial filtering fundamental theory of electrodynamic sensor is introduced and its spatial filtering property is also analyzed quantitatively in the paper.Further,the temporal frequency response characteristics of electrodynamic sensor are derived and the experimental test results on a gravity-fed conveyor are presented.Theoretical and experimental results obtained demonstrate that electrodynamic sensor acts as a low-pass filter in the spatial frequency domain and the spatial frequency bandwidth broadens with the increase of radial coordinate and the decrease of the axial length of the electrode.The measurement system including electrodynamic sensor and its signal electronics acts as a band pass filter in the temporal frequency domain.The effects of radial position and the axial length of the electrode on the temporal frequency bandwidth are similar to the spatial frequency domain.In addition higher particle velocity and smaller particle size result in a wider temporal frequency bandwidth.

A method for estimating wind-induced fluctuating internal pressure in the frequency domain is proposed and wind tunnel tests were carried out to verify the method. Based on Bernoulli equation, nonlinear differential equation for dynamic internal pressure is derived and random vibration theory combined with iteration algorithm is used to obtain the solution. Numerical examples are provided to investigate frequency response characteristic of internal pressure and the influences of opening ratio, opening...

A method for estimating wind-induced fluctuating internal pressure in the frequency domain is proposed and wind tunnel tests were carried out to verify the method. Based on Bernoulli equation, nonlinear differential equation for dynamic internal pressure is derived and random vibration theory combined with iteration algorithm is used to obtain the solution. Numerical examples are provided to investigate frequency response characteristic of internal pressure and the influences of opening ratio, opening number and opening position on fluctuating internal pressure. A series of low-rise building models with various openings were designed and wind tunnel tests were conducted. Experimental results agree well with theoretical ones. It is shown that the internal pressure fluctuation is determined by the frequency response characteristic of the cavity-orifice dynamic system and orifice pressure spectrum for single opening structures. For structures with multiple openings, wind pressure correlations at orifices also affect fluctuating internal pressure considerably.