Method and device for compressing granular materials

A method of compacting granular materials by means of a compacting device, which comprises a resonance vibrator designed as a linear oscillator with an oscillatory mass-spring system having a natural frequency, the mass of which system comprises a vibrating table, a mold for the material to be compacted and the material itself, and comprises an exciter for generating oscillations of the mass-spring system, which exciter can be regulated or controlled with respect to its exciter frequency, a frequency range Δf being selected for the exciter

• frequency fE or the natural frequency fN and the corresponding frequency fE or fN being adjusted during the compacting operation within the frequency range from its lower value to its upper value in such a way that it passes through the selected frequency range Δf in a given sequence function,
• the natural frequency being adjusted by means of an adjusting device during the compacting in such a way that it follows the exciter frequency, passing through the respectively selected frequency range Δf, or, when the natural frequency passes through the selected frequency range Δf, the exciter frequency follows in a predetermined dependence, in each case if appropriate while maintaining a specific frequency separation δf.