Schwingtisch

Schwingtisch

Modal testing

Schwingtisch

Vibrating table

schwingtisch

vibrating table

Befestigung des Gestelles auf dem Schwingtisch

Fixing of the frame on the oscillating table

Mit dem Schwingtisch wird ein Frequenzzyklus dergestalt ausgeführt, dass der als Prüfbeanspruchung unter Nummer 5.1 angegebene Frequenzbereich mit den jeweils zugehörigen Amplituden von der unteren zur oberen Frequenzgrenze und wieder zurück mit einer Geschwindigkeit von einer Oktave pro Minute durchlaufen wird.

A frequency cycle is effected with the vibrating table so that the frequency range indicated in paragraph 5.1, with its corresponding amplitudes, is covered from the lowest frequency to the highest and conversely, at a rate of one octave per minute.

Die Alu Platte wurde auf dem Schwingtisch montiert

The aluminum plate was mounted on the swinging table

Nach dem fünften Zyklus kann bei stillgesetztem Schwingtisch die Funktion geprüft und die für die Verwendung an Bord wesentlichen Funktionsdaten gemessen und festgehalten werden.

After the fifth cycle, the vibrating table may be stopped, the functions are tested and the operating data of importance for on-board use recorded and noted.

Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Kraftübertragungsorgan (908) zwischen der Haupt-Systemfeder (970) und dem Schwingtisch (124) vorgesehen ist und das Kraftübertragungsorgan wenigstens über einen Teil des bei der Durchführung der oberen Schwingwegamplitude (+A) zurückgelegten Schwingweges nicht durch die Federkraft der Haupt-Systemfeder belastbar ist, wodurch ein Freilaufweg (+A) des Kraftübertragungsorgans definiert ist, wobei bei Verwendung einer hydraulischen Haupt-Systemfeder (970) für die Befüllung bzw. Entleerung des durch den Freilaufweg ( A) des Federkolbens (908) erzeugbaren Zylindervolumens (+A) eine besondere Volumenaustausch-Einrichtung (920) vorgesehen ist, wobei der Federkolben (908) dem Kraftübertragungsorgan zugeordnet oder mit diesem identisch ist, und bei Verwendung einer mechanischen Haupt-Systemfeder ein Abheben des Kraftübertragungsorgans von der einzigen Feder bzw. von der resultierenden Feder vorgesehen ist.

A device for the compaction of granular materials into moldings (108) by the introduction of essentially harmonic vibrational forces, with an oscillatable mass/spring system (136) with one or more characteristic frequencies, comprising a main system spring (150, 970) for continuous conversion between kinetic energy of the mass/spring system (136) and spring energy, and a mass, which has an oscillating table (124), on which the spring force of the main system spring (150, 970) acts, and a mold (106) for receiving the moldings (108) which is firmly connected to the oscillating table (124) at least during compaction, an exciting device (144) adjustable with respect to its exciting frequency, with an exciting actuator for exciting the mass/spring system (136) to forced oscillations, from which the vibrational forces can be derived, the exciting force generated by the exciting actuator acting on the oscillating table (124), and the exciting frequency for the oscillations being either at the characteristic frequency or in the vicinity of the latter or being adjustable through a frequency range, within which at least one characteristic frequency is located, a control (190) for controlling or regulating the exciting device (144), a press plate (110) for acting by force on the moldings (108) in the mold (106), the forces transmitted by the press plate (110), on the one hand, and the forces transmitted by the main system spring (150, 970), on the other hand, being supported relative to a frame (100), through which forces involved in compaction are led along a closed force flux path, characterized ???in that the exciting actuator (144) and the main system spring (150, 970) are designed separately from one another and the force flux paths of the exciting force and of the spring force run at least partially separately, the main system spring (150, 970) being designed as a single mechanical spring or as a resultant spring composed of a plurality of mechanical individual springs. The device as claimed in claim 1 or 2, characterized in that a force transmission member (908) is provided between the main system spring (970) and the oscillating table (124), and the force transmission member cannot be loaded by the spring force of the main system spring at least over part of the oscillation excursion covered during the execution of the upper oscillation excursion amplitude (+A), with the result that a free-run path (+A) of the force transmission member is defined, a special volume exchange device (920) being provided when a hydraulic main system spring (970) is used for filling and emptying the cylinder volume (+A) capable of being generated by the free-run path (+A) of the spring piston (908), the spring piston (908) being assigned to the force transmission member or being identical to the latter, and a lifting-off of the force transmission member by the single spring or by the resultant spring being provided when a mechanical main system spring is used.