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US 7,924,020 B2Granted
Free-state modal frequency response testing
AssigneeSeagate Technology LLC
InventorsYuqi Wang, YiRen Hong, Takkoon Ooi, YiChao Ma, Kok Tong Soh, MingChou Lin
Life of this patent
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Abstract
An apparatus and associated method is provided for suspending a test object in a gravitational field from a support member, exciting the test object by noncontactingly engaging it with a predetermined waveform force, and characterizing the test object qualitatively in relation to an observed modal frequency response of the test object to the excitation.
Claims21
A method, comprising:
- suspending a test object in a gravitational field from a support member;
- exciting the test object by noncontactingly engaging it with a predetermined phased waveform force;
- and
- characterizing the test object qualitatively in relationship to an observed modal frequency response of the test object to the exciting step.
1 more element
An apparatus, comprising:
- a fixture that suspends a test object in a gravitational field;
- a solenoid that noncontactingly excites the test object by imparting a predetermined magnetic wave force to the test object that is generated in relation to varying an input frequency of an excitation voltage to the solenoid;
- and
- an analyzer that qualitatively characterizes the test object in terms of its modal frequency response to the excitation.
1 more element
An apparatus, comprising:
- a fixture that suspends a test object in a gravitational field;
- a cone speaker that noncontactingly excites the test object by imparting a predetermined acoustic wave force to the test object that is generated in relation to varying a sound pressure level associated with an excitation voltage to the cone speaker;
- and
- an analyzer that qualitatively characterizes the test object in terms of its modal frequency response to the excitation.
1 more element
A modal frequency response tester, comprising:
- a fixture that operably suspends a test object in a gravitational field;
- and
- means for qualitatively characterizing the test object in relation to observing its modal frequency response to a free-state waveform excitation force.
Dependencies are inferred from the claim text.