MB Modal Exciters – Ideally suited for experimental modal analysis
Modal shakers are used for local excitation of different structures to identify a structure´s modal properties such as natural frequencies, mode shapes, stiffness and damping. In contrast to classical shaker systems, modal shakers do not have a mounting table for fixing the test specimens. The connection to the structure is made via a pre-loaded piano wire or a stinger. Properly-featured modal exciters and amplifiers are critical to acquiring good experimental modal data and valid frequency response functions. In order to minimize the influence of the modal shaker on the structural resonances, these shaker systems are equipped with extremely lightweight moving elements. The axial stiffness of the suspension guiduing the moving element is also reduced to a minimum.
Extensive system accessories such as stingers in various diameters and lengths, chucks, additional weights and suitable sensors facilitate the connection of the vibration exciters to the structure to be investigated. Contact us to learn more about our Modal Exciters…
|Modal 50||Modal 110||Modal 250||Modal 500|
|Max. dynamic Force|
|220N peak||500N peak||1000N peak||2000N peak|
|110N rms||250N rms||500N rms||1000N rms|
|Max. Displacement||25mm pk-pk||38mm pk-pk||50mm pk-pk||50mm pk-pk|
|Frequency Range||DC-5000Hz, nutzbar bis 1000Hz||DC-5000Hz, nutzbar bis 1000Hz||DC-3000Hz, nutzbar bis 1000Hz||DC-3000Hz, nutzbar bis 1000Hz|
|Weight Moving Element||0,15kg||0,6kg||1,4kg||3kg|
|Connection to Structure||Wire or Stinger||Wire or Stinger||Stinger||Stinger|
|Attachment||Clamping Chuck||Clamping Chuck||Thread||Thread|
|Integrierte Kühlung||optional, external blower||optional, external blower||optional, external blower||optional, external blower|
|Weight, includuing Trunnion Base||25kg||22kg||115kg||205kg|
|Recommended Amplifier||MB 500VI||MB 500VI||MB 1000VI||PVL-Serie|
- Stinger clearance holes through the exciter armature for easy set-up.
- Collet chuck to quickly grip a smooth stinger without cutting one to a precise length.
- Lightweight armature that doesn’t mass load the test item.
- Weak armature suspension that doesn’t apply additional forces to the test item.
- Long strokes up to 50mm for flexible structures and low frequency “suspended shaker” tests.
- Thin stingers (including piano wire) decouples force inputs in all directions except the driven axis – avoids “cross axis” error in force measurement.
- Broad usable frequency range (DC-3000+ Hz) handles almost every modal survey.
- Uses permantent magnets to create a static magnetic field.
- No DC Field Coils -> Lower electrical poer dissipation and less heating
- Amplfiers with voltage and current feedback
- Amplifiers can be remotely operated over Ethernet network
- Modal analysis / modal testing