Traduction de «vitesse acoustique de référence » (Français → Anglais) :

particle velocity

sound particle velocity

sound particle velocity

instantaneous particle velocity

particle velocity

local particle velocity

volume velocity

The speed either at AA' or PP' is defined as the vehicle speed when the reference point passes AA' (vAA' ) or PP' (vPP' ).

The reference sound is assessed at a single point in one discrete gear, simulating an acceleration condition starting with an entry speed at vaa equal to 50 km/h and assuming an exit speed at vbb equal to 61 km/h.

The reference engine speed, nref_k, shall be calculated using the gear ratio of gear k at the reference speed of vref = 61 km/h.

6. Points out that functional specifications adopted by the Member States Interoperability Committee make version 2.3.0 the reference, as does the European Railway Agency. This version makes it possible to start operating high speed/high capacity international corridors in Europe as early as 2007 and is regarded as the common reference in the framework of the studies conducted by the European coordinator; considers that further efforts would make it possible to move in four or five years' time to a higher version; notes that in the framework of its "Change Control Management" process the European Railway Agency will have to assess the ...[+++]technical and economic relevance of such further developments, while abiding by the principle of continuity and upward and downward compatibility with version 2.3.0; believes that stabilisation and more extensive standardisation will enable system components to be manufactured in larger numbers, achieving economies of scale; considers that the price level, which today is up to eight times as high as the target prices originally specified, could then be reduced and ERTMS could be placed on an economically rational footing;