The term Degree of Freedom (DOF) appears in many areas of engineering. However, the same phrase refers to very different mathematical concepts depending on context.
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At our Santa Clara headquarters, the Crystal Instruments engineering team has constructed an 8-shaker MIMO vibration test system to demonstrate advanced multi-input multi-output (MIMO) control capabilities. This tabletop platform integrates eight coordinated shakers arranged around a central test structure, allowing us to reproduce complex excitation patterns and investigate sophisticated vibration control strategies.
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For engineers needing to verify performance against rigorous requirements, CTP ensures adherence to complex standards like MIL-STD-810H Method 520.5 Combined Environments. The new Combined Test Procedure (CTP) feature in EDM 12.1 allows users to synchronize temperature, humidity, and vibration testing in a single, unified workflow.
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Traditional SoR control methods, whether single-axis sequential testing or multi-axis TWR waveform replication, have significant limitations in representing true multi-directional vibration environments. The development of Crystal Instruments’ real MIMO Sine-on-Random control overcomes these barriers by integrating advanced adaptive MIMO algorithms with independent control of sine and random components
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Air cooled 60 kN electrodynamic shaker is capable of testing medium to large size assemblies up to 1000 kg on the bare armature, with even more load support utilizing the head expander (with pneumatic load support) or the high pressure slip plate.
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