MT-16.20 al.2002 →F=-mg(-x) Helicopter blade Figure 17.5 Representation of helicopter blade (radial force due to rotation) similar to previous case Once have F(x), proceed to solve equation (17-6). Since it is fourth order, need four boundary conditions (two at each end of the beam column) same possible boundary conditions as previously enumerated Notes When El-->0, equation(17-6)reduces to d/d dx dx this is a string(second order only need two boundary conditions one at each end Paul A Lagace @2001 Unit 17-9MIT - 16.20 Fall, 2002 ⇒ F = -mg (l - x) • Helicopter blade Figure 17.5 Representation of helicopter blade (radial force due to rotation) similar to previous case Once have F(x), proceed to solve equation (17-6). Since it is fourth order, need four boundary conditions (two at each end of the beam￾column) --> same possible boundary conditions as previously enumerated Notes: • When EI --> 0, equation (17-6) reduces to: − d F dw  = pz dx  dx  this is a string (second order ⇒ only need two boundary conditions -- one at each end) Paul A. Lagace © 2001 Unit 17 - 9