The Boeing Company

Jaffar Sher Iqbal

Mark Alan Negley

Bret A Voss

Alan Edgar Landmann

Mostafa Rassaian

Mark M Gmerek

Kenneth Joseph Hunziker

Jenna Kristin Pang

Giacomo Licciardi

A composite structure, such as a laminated composite panel, for example, comprises one or more layers or 'plies' embedded in a matrix material or otherwise fixed together in an arrangement, commonly referred to as a 'stack up.' Each material in the structure has a corresponding material failure model (MFM) defining the physical characteristics of that material. A ballistic threshold velocity computing device obtains the MFMs for each material in the composite structure, generates a predicted ballistic velocity threshold velocity for each MFM, and then generates a parametric model to compute a composite ballistic velocity threshold velocity for the composite structure.

Determining the ballistic threshold velocity for a composite structure using multiple failure models

A panel includes a structural substrate and a damping element including a viscoelastic material (VEM) layer coupleable to the structural substrate of the aircraft, and a constraining layer coupled to the VEM layer. The VEM layer is configured to dampen a vibration of the structural substrate. The constraining layer is configured to apply a shear force to the VEM layer.

Methods and systems for damping a cabin air compressor inlet

A computer system enables a noise level associated with a structural substrate to be reduced. The computer system includes a memory device for storing data, and a processor in communication with the memory device. The processor is programmed to define a modulus of elasticity, a thickness, and/or a distribution associated with one or more damping elements coupleable to the structural substrate, define at least one operating parameter associated with the structural substrate and the one or more damping elements, simulate a first performance of the structural substrate and/or the one or more damping elements to generate a first performance data set; and determine whether the first performance data set satisfies a predetermined threshold. The first performance data set is associated with the at least one operating parameter and the modulus of elasticity, the thickness, and/or the distribution associated with the one or more damping elements.

Methods and systems for determining a structural parameter for noise and vibration control

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Seattle, WA, United States of America

Jaffar Sher Iqbal