2-33 (a) are at = One poles at = 0. 0, s Marginally stable. s j1.6583, j1.6583 −1.5+ −1.5− (b) Poles are at = 2, 2 Two poles on axis. Marginally stable. s j j jω −5, − (c) are at = + Two poles in RHP. Unstable. 0.4344 0.4344 s j2.3593, j2.3593 −0.8688, − (d) Poles are at = All poles in the LHP. Stable. s j, j −5, −1+ −1− (e) are at = 1.6634 + 1.6634 Two poles in RHP. Unstable. s j2.164, j2.164 −1.3387, − (f) Poles are at = ± ± Two poles in RHP. 21.3487 Unstable. s j22.6376, j22.6023 −22.8487 2-35 38 39 40. CHAP8.
2-33 (a) are at s = 0, −1.5+ j1.6583, −1.5− j1.6583 One poles at s = 0. Marginally stable. (b) Poles are at s = −5, − j 2, j 2 Two poles on jω axis. Marginally stable. (c) are at s = −0.8688, 0.4344 + j2.3593, 0.4344 − j2.3593 Two poles in RHP. Unstable. (d) Poles are at s = −5, −1+ j, −1− j All poles in the LHP. Stable. (e) are at s = −1.3387, 1.6634 + j2.164, 1.6634 − j2.164 Two poles in RHP. Unstable. (f) Poles are at s = −22.8487 ± j22.6376, 21.3487 ± j22.6023 Two poles in RHP. Unstable. 2-35 38 39 40. CHAP8.