The behaviour of a remote-position-control servo mechanism with hard-spring non-linear characteristics

An experimental investigation was carried out to obtain the behaviour of a position-control system whose amplifier has a non-linear amplitude characteristic classed as the ¿hard-spring¿ type. Apart from the non-linearity aspect the system is simple, being a second-order remote-position-control servo mechanism stabilized by a ¿phase advance¿ network. Results have been obtained for transient response and steady-state frequency response under various operating conditions. Some theoretical verification is also included.