The root-locus showed what follows. 1) The value of the ratio has no effects on the form of the root locus, but the marginal value of the stability for the proportional gain increases as the ratio increases. 2) When the ratio exceeds the original airway resistance in the experimental system, the system becomes unstable. 3) The system remains stable but becomes more oscillatory when the lung compliance decreases, this is, the lung gets stiffer.
This paper describes the development of a soil nailing machine that is now in commercial operation, thetechnique being exploited by Soil Nailing Ltd. The machine basically consists of an electrohydraulicallyoperated mobile vehicle, both wheel and tracked types being used, to which is connected a pneumaticallyoperated air launcher capable of firing “nails” up to 38mm diameter, 6m long, at a very high exit velocity. This results in a highly manoeuvrable system that can fire nails economically, rapidly, accurately, and will be playing a vital role in a range of Civil engineering applications concerned with the strengthening of soils.