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A possible approach to the statistical description of granular assembliesstarts from Edwards' assumption that all blocked states occupying the samevolume are equally probable (S.F. Edwards, R. Oakeshott, Physica A 157, 1080(1989)). We performed computer simulations using two-dimensional polygonalparticles excited periodically according to two different protocols: excitationby pulses of "negative gravity" and excitation by "rotating gravity". The firstprotocol exhibits a non-monotonous dependency of the mean volume fraction onthe pulse strength. The overlapping histogram method is used in order to testwhether or not the volume distribution is described by a Boltzmann-likedistribution, and to calculate the inverse compactivity as well as thelogarithm of the partition sum. We find that the mean volume is a uniquefunction of the measured granular temperature, independently of the protocoland of the branch in $\phi(g)$ and all determined quantities are in agreementwith Edwards' theory.

Simulations support protocol independency of the granular temperature