Oscillation criteria are obtained for the higher order neutral type nonlinear forced differential equation with oscillating coefficients of the form y(t)+∑lj=1pj(t)y(σj(t)) (n) +∫ -γ q(t,s)f(y(t+s))dσ(s)=h(t)
By using global inverse function theorems this paper proves the existense and uniqueness of periodic solution of forced Liénard equation x″+f(x)x′+g(t,x)=e(t) The results generalize and improve some known results.
The combination structure of shaped steel was adopted for crossing tower. The main forced components were combined with welding cross column and angle steel, the yield strength of high-strength steel material was 430～450 Mpa, the biggest thickness of cross column was 65 mm.
Oscillation of forced neutral differential equations with positive and negative coefficients
In this paper the forced neutral differential equation with positive and negative coefficients is considered, where f ε L1(t0, ∞) ∩ C ([t0, ∞),R), P,Q,R ε C ([t0, ∞), R+) and r,τ,σ∈(0, ∞).
Oscillation for forced odd order neutral differential equations
In this paper, the forced odd order neutral differential equations of the form are considered 1 A sufficient condition for the oscillation of all solutions is obtained.
Meanwhile, some structure parameters that may affect the dynamic performance and forced vibration under unbalance motivation of the rotor-bearing system considering mechanical seals are analyzed in the paper.