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US 7,925,475 B2Granted
Analyzing structural design relative to vibrational and/or acoustic loading
AssigneeThe Boeing Company
InventorsMostafa Rassaian, Jung-Chuan Lee
Life of this patent
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Abstract
A computer-performed method of designing a structure. User-selected design parameters are input to a parametric model of the structure. Boundary conditions and load conditions are applied to the model to determine a response of the structure to the conditions. Based on the load conditions, an analysis method is selected. The modeled response is analyzed using the selected analysis method to obtain power spectral density (PSD) values for the model. The PSD values are averaged over a user-selected frequency range to evaluate the design parameters for acoustic transmission loss. This method provides a high degree of flexibility in formulating structural design analyses.
Claims19
A method of designing a structure, the method comprising:
- receiving one or more user-selected design parameters;
- inputting the design parameters to a parametric model of the structure;
- representing one or more load conditions as one or more input power spectral density (PSD) values that define one or more excitation conditions,
- applying one or more boundary conditions and the one or more input PSD values to the model to simulate a response of the structure to the one or more load conditions;
- based on a type of the one or more input PSD values representing at least one of the one or more load conditions, selecting a modal analysis method;
- analyzing the simulated response using the selected analysis method to obtain power spectral density (PSD) values representing nodal displacement, nodal acceleration, nodal velocity, and element stress for user-selected structural elements of the model;
- averaging at least some of the obtained PSD values over a user-selected frequency range to evaluate effects of excitation-structural coupling on the structure;
- and
- based on the averaged PSD values, adjusting the design parameters for convergence toward an optimized design for the structure;
- the method performed by one or more processors and memory.
7 more elements
A method of optimizing a design of a structure comprising:
- inputting one or more design parameters selected by a user to a parametric model of the structure;
- preloading the model with data representing one or more initial stresses on the structure and simulating a response by the stressed structure to the initial stresses;
- receiving one or more excitation conditions specified by the user as one or more input power spectral density (PSD) values;
- applying one or more boundary conditions and one or more of the input PSD values to the model to obtain data descriptive of a response of the stressed structure to the one or more excitation conditions;
- based on a type of input PSD representing at least one of the one or more specified excitation conditions, selecting one of a plurality of frequency-domain analysis methods;
- using the selected analysis method to analyze the data to obtain power spectral density (PSD) values representing nodal displacement, nodal acceleration, nodal velocity, and element stress for one or more selected structural elements of the model;
- averaging one or more of the obtained PSD values over a user-selected frequency range to evaluate effects of excitation-structural coupling on the structure;
- and
- based on the averaging of the one or more obtained PSD values:
- adjusting the design parameters;
- providing the adjusted design parameters to the model;
- and
- repeating at least the applying, selecting, and using steps to obtain an optimized design;
- the method performed by one or more processors and memory.
11 more elements
A system for designing a structure comprising one or more processors and memory configured to:
- receive one or more design parameters selected by a user;
- input the design parameters to a parametric model of the structure;
- represent one or more excitation conditions specified by the user as one or more input power spectral density (PSD) values;
- apply one or more boundary conditions and one or more of the input PSD values to the model to obtain frequency-domain data descriptive of a response of the structure to the one or more excitation conditions;
- based on a type of input PSD representing at least one of the one or more specified excitation conditions, select one of a plurality of modal response analysis methods;
- use the selected analysis method to analyze the data to obtain power spectral density (PSD) values representing effects of excitation-structural coupling on one or more selected structural elements of the model;
- wherein the obtained PSD values comprise at least one of values representing nodal displacement, nodal acceleration, nodal velocity and element stress;
- averaging one or more of the obtained PSD values over a user-selected frequency range to evaluate effects of excitation-structural coupling on the structure;
- and
- based on the one or more obtained PSD values:
- adjust the design parameters;
- provide the adjusted design parameters to the model;
- and
- repeat at least the applying and using to obtain an optimized design.
11 more elements
Dependencies are inferred from the claim text.