Excellence in engineering
www.airframedesigns.com
Our core capabilities cover traditional static stress analysis (hand calculation), FEM (Finite Element Modelling), and F&DT (Fatigue and Damage Tolerance) evaluation. Analysis
Our team is highly familiar with current IATA, CAA, FAA, EASA, and UK MAA regulatory requirements, alongside historical JAA, CAR, and BCAR equivalent airworthiness specifications. Certification
We assist UK-CAA & EASA design organisations in the certification of changes or repairs to aircraft and rotorcraft providing a peer review service of elected certification basis, certification plans, and compliance demonstration evidence.
Our CVEs (Compliance Verification Engineers) visit test facilities to witness and verify test activities that underpin certification, and we hold regular dialogue with the competent authorities. As a turn-key package of support we can independently compile and verify substantiation evidence, working within the framework and constraints of the customer design organisation policies.
We also provide support in the assessment of vibration, bird strike, and aerodynamics, including CFD (Computational Fluid Dynamics). For traditional static stress analysis, we use a combination of hand-calculations, MATHCAD computation, Excel Spreadsheets, and PYTHON scripting to check the strength of metallic, non- metallic, and composite structures. We perform analysis to suit the client needs, whether this be initial sizing to support conceptual design phases, or final design calculations to support project certification submissions. Our primary finite element modelling tool is MSC ONE, using NASTRAN code with PATRAN and APEX pre and post processors. This provides an advanced meshing and generative design capability that streamlines CAD clean-up and simplifies the meshing and modelling workflow.
Our engineers are highly familiar with the techniques employed for modelling airframe thin- walled structures using beam and shell elements (e.g., major fittings) using 3D TET or HEX solid elements. We perform Fatigue Analyses using either a stress- based (s-N) or strain-based (e-N) approach and develop the necessary analysis tools from first principles to suit the analysis requirements and needs of the customer. For Damage Tolerance we conduct a crack growth assessment using in-house scripts, client-supplied software, or commercially available tools such as AFGROW or NASGRO. We have extensive knowledge in the F&DT assessment of fuselage penetrations for antenna feed-throughs and the substantiation of modified Fatigue Critical Structure.
We awarded the monument stress analysis to AFD owing to their extensive experience and knowledge in analysing this kind of structure and their pro- active approach to resolving technical difficulties often encountered in the design phase. The added value of using AFD was their pre-existing relationship with our customer (the DOA) enabling AFD to compile, check and verify the structural substantiation.
Kevin Hann, Engineering Manager, JETMS Completions
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