Helicopter rotors have traditionally been equipped
with passive dampers for aeromechanical stability.
These passive systems have fixed characteristics, and
add to mechanical complexity and high maintenance
cost. Furthermore, they are unable to change to
compensate for an unexpected loading trends as
typically encountered by a rotary wing vehicle.
Semi-active control strategies are dissipative in
nature, inherently stable, and require a little
energy to operate. Hence, they appear to be
particularly promising in addressing a
number of the challenges facing active control
strategies, in that...

This book is based on a critical study on the existing purchase procedures and practices of the company and suggest reforms to enhance service level of the purchase department and its customers. This book covers various topics in-depth such as various departmental structure, functions of various modules of Enterprise Resource Planning software i.e. ERP LN FP-2, MRP, BOM, make or buy decisions, purchase specifications, price evaluation system, proforma invoice, purchase order, quality inspection, goods receipt note, letter of credit, source management, price analysis, cost analysis and value...