Scilab Home page | Wiki | Bug tracker | Forge | Mailing list archives | ATOMS | File exchange
Please login or create an account
Change language to: Français - Português - 日本語 - Русский

Please note that the recommended version of Scilab is 6.0.2. This page might be outdated.
See the recommended documentation of this function

Scilab Help >> Control Systems - CACSD > Linear Analysis > Frequency Domain > freson

freson

peak frequencies

Syntax

fr=freson(h)

Arguments

h

A siso linear dynamical system, in state space, transfer function or zpk representations.

fr

vector of peak frequencies in Hz

Description

returns the vector frequencies at which the response amplitude of a siso dynamical system is a relative maximum also called resonance frequencies.

Examples

Continuous time system

h=syslin('c',-1+%s,(3+2*%s+%s^2)*(50+0.1*%s+%s^2));
fr=freson(h)
clf;bode(h);
fig=gcf();sca(fig.children(2));
[phi,db]=phasemag(repfreq(h,fr));
plot(fr,db(:),'+r')

Discrete time system

hd=dscr(h,0.01)
fr=freson(hd)
clf;bode(hd);
fig=gcf();sca(fig.children(2));
[phi,db]=phasemag(repfreq(hd,fr));
plot(fr,db(:),'+r');

See also

  • frep2tf — transfer function realization from frequency response
  • zgrid — zgrid plot
  • h_norm — H-infinity norm

History

VersionDescription
6.0

handling discrete systems and zpk representation, peak detection improved.

Scilab Enterprises
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Tue Feb 14 15:02:45 CET 2017