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Shock Response Spectrum (SRS) Analysis

Project Brief

This case study details the comprehensive shock response spectrum (SRS) analysis conducted on the SWIR assembly. Utilizing the finite element software, we evaluated structural forces, stresses, and displacements to ensure the assembly could withstand specified shock inputs. The analysis provided critical insights into the structural integrity and resilience of the SWIR assembly under shock conditions.

Challenges and Objectives

The client required an in-depth shock analysis of their SWIR assembly to determine if it could endure the specified shock inputs defined by the shock response spectrum (SRS). The key challenges included:

  • Handling a pre-meshed model received from the client, ensuring it met all necessary analysis requirements.
  • Fixing the structure accurately at the flexure interface plate to simulate real-world conditions.

The primary objective was to validate that the SWIR assembly could withstand the shock requirements without experiencing structural failure.

Methodology (Solutions Implemented)

Our approach began with receiving and verifying the pre-meshed model from the client. The following steps were implemented to achieve the analysis objectives:

  1. Model Verification and Pre-processing:
    • Contact Elements: Treated as bonded with no separation to mimic real-world conditions.
    • Material Assumptions: Assumed homogeneous materials for weld regions and structural members, identical to the components being analyzed.
  2. Finite Element Analysis (FEA):
    • Response Spectrum Method: The FEA model utilized the SRS method to simulate the shock response.
    • Structural Analysis Assumptions: Assumed no snow loads, self-restraining loads, or other external loads applied during the analysis.
  3. Post-processing and Results Interpretation:
    • Structural Forces and Stresses: Evaluated to determine the structural integrity under shock conditions.
    • Displacements: Measured to ensure they were within acceptable limits, confirming the assembly’s capability to withstand the specified SRS inputs.

Benefits (Results Achieved)

The SRS analysis provided significant benefits, including:

  1. Validation of Structural Integrity:
    • Stress Analysis: Revealed that the stresses within the assembly were within the permissible limits, ensuring no risk of structural failure.
    • Displacement Analysis: Confirmed that the displacements were minimal and did not compromise the assembly’s functionality.
  2. Enhanced Confidence in Design:
    • The analysis validated the client’s design assumptions and provided a robust confirmation that the SWIR assembly could endure the required shock inputs.
  3. Quantifiable Data:
    • Delivered precise numerical results and graphical representations of the stress and displacement distributions.

Summary of Project

This case study highlights the successful application of shock response spectrum (SRS) analysis on the SWIR assembly. By addressing the client’s challenges and meeting the objectives, we provided a thorough validation of the assembly’s capability to withstand specified shock inputs. The comprehensive analysis, supported by precise data and clear conclusions, reinforced the structural integrity of the SWIR assembly, enhancing the client’s confidence in their design and its real-world applicability.

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