用途
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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
| 特点
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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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4827和4828模态激振器是为大型复杂结构模态试验而设计的电动模态激振器，能提供精确、稳定、可靠的长时间运行。高品质材料、严格的品质控制和牢固的结构能在无限制条件激振方法下为任何模态试验提供多种多样的模态激励。
4827和4828激振器的激励力分别为650N (正弦)和1000 N (正弦)，特别适合作为SISO/SIMO试验系统中各种机械部件高精度激励，如大型汽车结构件、宇航结构、机车、载货车白车身、大型发动机、大型工业涡轮、重型泵站等。 这种模态激振器也是大型或超大型结构MISO/MIMO试验系统中条件苛刻且不确定激振的理想激振器。
较低的动圈重量能减少在共振频率时试件的力的分散，确保高品质的力测量。特殊的滚子导向支承能保证完整的2英寸峰-峰值位移行程并构成强烈的平行导向系统，具有很高的刚度，阻止试件的旋转运动。 此外，通过这种构造，激振器能吸收大的侧向力，保护其内部不受损坏。
完整的描述和技术规格，见
产品资料
