이용
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General mechanical mobility measurements
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Experimental modal analysis on most mechanical structures
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SISO, MISO, SIMO and MIMO modal test applications
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Advanced structural dynamic investigations
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Structural damage detection
| 기능
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Force rating 650N sine (Type 4827) and 1000 N sine (Type 4828) (with forced air cooling)
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Rugged, industrial design
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Can be delivered as a complete turnkey excitation systems (Types 3627 and 3628)
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High force-to-weight ratio
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2" peak-to-peak displacement for best low-frequency excitation
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High-rigidity, low-mass magnesium armature for minimised force drop-offs at resonance frequencies
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Wide frequency range
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Low stray magnetic field
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Built-in air switch for protection against damage related to excessive current
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Blocked forced air cooling with installation of Squeak and Rattle Option WQ-2553 (maximum operating time is 2 hours)
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Electronic DC control of tension wire pre-tensioning
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Full range of stingers – tension wire technology (only electrical pre-tensioning) as well as traditional push/pull stinger technology (optional)
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Built-in optical sensor for accurate determination of armature position
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Ideal for any excitation signal (sine, impulse or random based signals)
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With a force rating of 650N (sine) and 1000N (sine) respectively, Modal Exciters Types 4827 and 4828 are ideal for high-precision excitation of a variety of mechanical structures in SISO/SIMO test setups, e.g., large automotive structures, aerospace structures, locomotives, truck body-in-white, large engines, large industrial turbines, heavy-duty pumps, etc. These modal exciters are also ideal for demanding and uncompromised excitation of large and very large structures in MISO/MIMO test setups.
The low armature weight helps to ensure high-quality force measurements by minimising force drop-offs at the test specimen's resonance frequencies. Unique roller guide suspension of the armature provides for a full 2˜ peak-to-peak displacement capability and form a strong rectilinear guidance system providing very high transverse stiffness to counteract rotational movement of the structure under test. Also, through this configuration, Modal Exciters Types 4827 and 4828 can absorb high lateral forces without damage to the exciter's internal construction.
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