A complex number used to characterize exponential and damped sinusoidal motion in the same way that an ordinary frequency characterizes simple harmonic motion; designated by the constant s corresponding to a motion whose amplitude is given by Aest, where A is a constant and t is time.McGraw...
A parameter sensitivity analysis shows that the friction coefficient is linearly correlated with the system's instability and the frequency of the unstable modes of vibration.doi:10.1016/j.wear.2019.203150O. El BeshbichiC. WanS. BruniE. Kassa...
Microchannels are the essential elements in animals, plants, and various artificial devices such as soft robotics, wearable sensors, and organs-on-a-chip. However, three-dimensional (3D) microchannels with complex geometry and a high aspect ratio remain
thesetwofiniteelementapproachesarenotcapableofpredictingapproximatelyidenticalunstablefrequencies.TheABAQUSapproachcanpredictinstabilitiesofhighfrequencyupto20kHzormore,whiletheNASTRANapproachcanonlypredictsomeinstabilitiesofhighfrequency,notal1.Moreover,thesimulationresultsalsoshowthatboththecontactspringstifinessandmeshsize...
The torsional wave T(0,1) at low frequency is generally the most preferred mode due to its non-dispersion and low demands on the transduction system. In addition, enabled by the miniaturized transducers that can be integrated into the monitored structure, GW-based SHM in an in situ and ...
The ABAQUS approach can predict instabilities of high frequency up to 20 kHz or more, while the NASTRAN approach can only predict some instabilities of high frequency, not all. Moreover, the simulation results also show that both the contact spring stiffness and mesh size have influences to ...
Studies of the natural oscillations of perforated vibrating surfaces have been conducted using the finite element method in Abaqus, which has proved sufficient accuracy of calculations. The dependencies of the natural oscillation frequency of perforated surface samples on their thic...
The ABAQUS approach can predict instabilities of high frequency up to 20 kHz or more, while the NASTRAN approach can only predict some instabilities of high frequency, not all. Moreover, the simulation results also show that both the contact spring stiffness and mesh size have influences ...
Furthermore, the resonance of the femoral components at a frequency of 3177 Hz is found to be the source of the unstable vibration in squeaking. On the basis of the etiology of squeaking, two methods for suppressing squeaking are proposed. One method is adding ultra-high molecular weight ...
The complex damping model is often used in frequency domain structural analyses because of its characteristics of constant modal damping ratio with frequency and frequency-independent energy dissipation. Based on the five-parameter integer-order derivative method, a user subroutine of ABAQUS is developed...