Uses
- General mechanical mobility measurements
- Experimental modal analysis on most mechanical structures
- SISO, MISO, SIMO and MIMO modal testing applications
- Advanced structural dynamics investigations
- Structural damage detection
- Finite element model correlation
| Features
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Force rating 200N sine (Type 4825) or 400 N sine (Type 4826)
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Rugged, industrial design
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Extremely high force-to-weight ratio due to rare-earth magnet technology
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One inch 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
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Compact construction enabling easy positioning/orientation relative to test object
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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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Built-in optical sensor for accurate determination of armature position
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Ideal for any excitation signal (sine, impulse and random signals)
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Electronic DC control of tension wire pre-tensioning (optional)
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Hole-through design for choice of tension wire stingers . tension wire technology as well as traditional push/pull stinger technology (optional)
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Robust lateral exciter stands for easy positioning and orientation (optional)
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Can be delivered as a complete turn-key excitation system with trunnion, auxiliary hardware and all necessary cables
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With a force rating of 200N (sine) and 400N (sine) respectively, Modal Exciters Types 4825 and 4826 are ideal for high-precision excitation of a variety of mechanical components in SISO/SIMO test setups, e.g., automotive structures, aerospace sub-structures, passenger car and truck body-in-white, engines, power train and drive train components. Also, these modal exciters are ideal for demanding and uncompromised excitation of large and very large structures in MISO/MIMO test setups. Based on unique rare-earth neodymium magnet technology, Modal Exciters Types 4825 and 4826 feature extremely small physical dimensions relative to the force rating along with low total weight and a low-mass, high-rigidity, spring-suspended armature.
The low armature weight helps to ensure high-quality force measurements by minimising force drop-offs at the test specimen's resonance frequencies. Four upper radial flexures and four lower radial flexures, the latter providing an additional guide for best stabilisation, form a strong rectilinear guidance system which keeps the driver coil perfectly centered in the magnetic assembly's air gap. In the transverse directions and in torsion, the flexure system provides very high stiffness to counteract rotational movement of the test specimen. Also, through this configuration, the modal exciter can absorb high lateral forces without damage to the exciter's internal construction.
The "hole-through" design makes it possible to use tension wire stingers or traditional push/pull stingers with the exciter. Easy and fast attachment of both types of stingers is achieved with the chuck nut assembly (for use with tension wire stingers) or with an M6 to 10–32 UNF threaded insert (for use with...
For a full Description and Specifications, see 
Product Data
