Self-oscillation existence = SOE, namely the operation result from program uhp.nb. the (uhx, uhr) is multi-solution.

Self-oscillation disappearance = SOD, namely the operation result from program onlyup.nb.

, the θ is arbitrary

(a)

;;;;;;;; SOE

(b)

;;;;;;;; SOE

(c)

;;;;;;;; SOE

(d)

;;;;;;

; SOD

(e)

;;;;;;

; SOD

(f)

;;;;;;

; SOD

(g)

;;;;;;

; SOD