Demonstration analyses showcasing our methodology, deliverables, and technical rigor. All examples use fictional hardware for illustration purposes.
LA Tech Designs LLC specializes in mechanical engineering analysis for aerospace, defense, and high-reliability electronics programs. Our portfolio demonstrates the types of analysis deliverables we produce — including finite element analysis (FEA) reports, hand calculation packages, and test prediction documents — all formatted to industry and customer standards.
Each case study below walks through our engineering methodology from problem definition through final margin-of-safety assessment. Analysis disciplines covered include random vibration, structural FEA, steady-state thermal, and PCB/CCA dynamic analysis — the core capabilities we bring to every program.
This case study applies MIL-STD-810 random vibration methodology to a fictional avionics line replaceable unit (LRU). The analysis covers input power spectral density (PSD) profile definition, finite element modal extraction, response PSD generation, and component-level fatigue life estimation using the Steinberg three-band technique. Transmissibility curves are computed across the frequency range of interest to identify resonant modes and assess amplification factors. Miles' equation is applied for simplified GRMS response checks at critical attachment points. Final deliverables include a margin-of-safety summary table and a test prediction report formatted to customer requirements.
This study presents a steady-state conduction and convection thermal analysis of a fictional avionics enclosure housing multiple power-dissipating PCB assemblies. Using ANSYS Mechanical, the model predicts junction temperatures (Tj) for critical semiconductor devices and compares results against manufacturer derating curves. Thermal resistance paths from junction to ambient are characterized for each component, and heat sink geometry is optimized to maintain all devices below maximum rated temperatures across the defined operating environment. The deliverable includes a thermal contour map, a component-level Tj summary, and design recommendations for heat spreading improvements.
This case study demonstrates natural frequency prediction and dynamic suitability assessment for a fictional multi-layer circuit card assembly (CCA) populated with through-hole and surface-mount components. The first natural frequency (fn1) is calculated analytically using the Steinberg simplified plate method, accounting for board dimensions, layer stackup, edge support conditions, and component mass distribution. Results are evaluated against the Steinberg allowable deflection criteria to determine component fatigue risk under random vibration loading. IPC-2221 guidelines are referenced for component placement best practices, and conformal coating effects on fatigue life are discussed.
All case studies use fictional hardware and programs for demonstration purposes only. No proprietary or ITAR-controlled information is presented.