spurious oscillation การใช้

• Stability in this context refers to " an amplifier's immunity to causing spurious oscillations ".
• Capturing sharp changes in the solution requires the use of second or higher-order numerical schemes that do not introduce spurious oscillations.
• In present undergraduate engineering education, the emphasis on linear systems develops a way of thinking that dismisses nonlinear dynamics as spurious oscillations.
• Spurious oscillation may occur as particles cross the boundaries of the mesh in MPM, although this effect can be minimized by using generalized interpolation methods ( GIMP ).
• Although the above second-order scheme provides greater accuracy for smooth solutions, it is not a total variation diminishing ( TVD ) scheme and introduces spurious oscillations into the solution where discontinuities or shocks are present.
• The function \ phi \ left ( r _ i \ right ) is a limiter function that limits the slope of the piecewise approximations to ensure the solution is TVD, thereby avoiding the spurious oscillations that would otherwise occur around discontinuities or shocks-see Flux limiter section.
• However, the approximate solutions can still contain ( decaying ) spurious oscillations if the ratio of time step & Delta; times the thermal diffusivity to the square of space step, & Delta;, is large ( typically larger than 1 / 2 per Von Neumann stability analysis ).
• Though shock waves are sharp discontinuities, in numerical solutions of fluid flow with discontinuities ( shock wave, contact discontinuity or slip line ), the shock wave can be smoothed out by low-order numerical method ( due to numerical dissipation ) or there are spurious oscillations near shock surface by high-order numerical method ( due to Gibbs phenomena ).