System and method for inspecting parts using frequency response function
First Claim
1. A system for the non-destructive, in-situ testing of one or more parts manufactured using an additive manufacturing process, the system comprising:
- an additive manufacturing build platform positioned in an additive manufacturing machine and configured to support the one or more parts during the additive manufacturing process;
an input mechanism configured to excite with an excitation force the additive manufacturing build platform on which one or more parts are located to induce a dynamic response in the one or more parts;
an output mechanism configured to sense the induced dynamic response in the one or more parts; and
a processing element configured to determine a relationship between the excitation force and the dynamic response and to compare a phase of the determined relationship to a reference in order to identify an indication of a defect in the one or more parts, and to communicate an alert if the indication of the defect is identified.
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Abstract
A system and method for the non-destructive testing of additively manufactured parts. An input mechanism excites with an excitation force (e.g., a vibration) an additive manufacturing build platform on which the part is located to induce a dynamic response in the part. An output mechanism (e.g., a non-contact transducer) senses the induced dynamic response in the part. A processor determines and examines the relationship between the response and excitation to identify an indication of a defect in the part, and communicates an alert if the indication is identified. The processor may compare the phase, magnitude, coherence, or time delay of the relationship to a reference relationship and/or may compare the modal frequency or the modal damping to a reference to identify a deviation greater than a pre-established threshold.
37 Citations
23 Claims
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1. A system for the non-destructive, in-situ testing of one or more parts manufactured using an additive manufacturing process, the system comprising:
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an additive manufacturing build platform positioned in an additive manufacturing machine and configured to support the one or more parts during the additive manufacturing process; an input mechanism configured to excite with an excitation force the additive manufacturing build platform on which one or more parts are located to induce a dynamic response in the one or more parts; an output mechanism configured to sense the induced dynamic response in the one or more parts; and a processing element configured to determine a relationship between the excitation force and the dynamic response and to compare a phase of the determined relationship to a reference in order to identify an indication of a defect in the one or more parts, and to communicate an alert if the indication of the defect is identified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for the non-destructive, in-situ testing of one or more parts manufactured using an additive manufacturing process, the method comprising:
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manufacturing a part with a known defect on an additive manufacturing build platform using additive manufacturing; exciting with an input mechanism the additive manufacturing build platform on which the part with the known defect is located by using an excitation force to induce a first dynamic response in the part with the known defect, the additive manufacturing build platform being positioned in an additive manufacturing machine and configured to support the part with the known defect during the additive manufacturing process; sensing with an output mechanism the first dynamic response in the part with the known defect; determining with an electronic processing element a relationship between the excitation force and the first dynamic response to identify an indication of the known defect; exciting with the input mechanism the additive manufacturing build platform used in additive manufacturing on which the one or more parts are located by using the excitation force to induce a second dynamic response in the one or more parts, the additive manufacturing build platform being positioned in the additive manufacturing machine and configured to support the one or more parts during the additive manufacturing process; sensing with the output mechanism the second dynamic response in the one or more parts; and determining with the electronic processing element a relationship between the excitation force and the second dynamic response to determine if the indication of the known defect is present in the relationship between the excitation force and the second dynamic response, and electronically communicating an alert if the indication of the known defect is identified. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification