MP-AI-20/mechanical-engineering-skills

abrasive-wear

Abrasive wear — Archard wear law, two-body vs. three-body abrasion, hardness ratio, abrasion-resistant steels, ceramics, rubber liners, slurry wear, ASTM G65/G105/G75 testing.

abs-system

Anti-lock braking system (ABS) — wheel slip control, slip ratio, hydraulic modulator, ECU logic, brake force distribution, stability, SAE J2246, vehicle dynamics.

absorption-refrigeration

Absorption refrigeration — LiBr-water and NH3-water cycles, COP, generator/absorber/condenser/evaporator heat duties, waste heat driven cooling, double-effect cycles, ASHRAE standards.

accelerated-life-testing

Accelerated life testing (ALT) — Arrhenius/Coffin-Manson/power-law models, acceleration factors, HALT/HASS, Weibull analysis, test planning, MIL-HDBK-781, IEC 60068.

acoustic-emission

Acoustic emission (AE) testing — Kaiser effect, source location, AE parameters (count, energy, amplitude), wave modes, transducer selection, pressure vessel monitoring, ASME Section V Article 12, ASTM E1316.

acoustic-enclosure

Acoustic enclosure design — insertion loss, transmission loss (mass law), coincidence frequency, damping, leakage, vibration isolation, OSHA/ISO limits, NR/NC curves.

acoustic-fatigue

Acoustic fatigue — random acoustic loading on panels, SPL/OASPL, Miner's rule for random fatigue, Miles equation, panel response, jet engine exhaust, MIL-STD-1530, ESDU 84008.

acoustic-induced-vibration

Acoustic-induced vibration (AIV) in piping — Carucci-Mueller method, flow-induced noise, acoustic power, pipe wall response, branch connections, EI guidelines, NORSOK L-002.

acoustic-standards

Acoustic standards — noise measurement (ISO 3744/3746 sound power), community noise (dBA/Leq/Lnight/Lden), vibration-induced structure-borne noise, machinery noise emission directives, EPA/EU noise limits.

acoustics-nvh

Acoustics and NVH — sound pressure level (dB), octave bands, sound power, transmission loss, absorption, room acoustics (RT60), noise source ranking, sound intensity, STC ratings.

active-magnetic-bearing

Active magnetic bearing (AMB) — electromagnetic force model, PID/LQR control, rotor dynamics on AMB, stiffness/damping estimation, backup bearings, ISO 14839, high-speed machine applications.

active-noise-control

Active noise control (ANC) — feedforward/feedback ANC, LMS filtered-x algorithm, secondary path, coherence, ANC headphones, duct noise cancellation, ANSI S1.11.

active-vibration-control

Active vibration control (AVC) — feedforward/feedback architectures, filtered-x LMS, piezoelectric actuators, active mounts, AMD, ANC, stability, hardware, applications.

actuator-selection

Actuator selection — electric (servo/stepper/linear), pneumatic, hydraulic, piezoelectric, SMA; force/speed/stroke requirements, backdrivability, duty cycle, power density comparison, IEC 61800.

adaptive-control

Adaptive control — MRAC (model reference), self-tuning regulator, MIT rule, Lyapunov-based adaptation, gain scheduling, parameter identification, stability, aerospace and process applications.

additive-manufacturing

Additive manufacturing (3D printing) — process selection (FDM/SLA/SLS/DMLS/LPBF), design for AM (DfAM), topology optimization, support structures, material properties, post-processing, tolerances.

adhesive-joints

Adhesive joint design — lap joint stress (Volkersen, Goland-Reissner), peel stress, failure modes, surface preparation, structural adhesives, design guidelines.

adhesive-selection

Adhesive selection — epoxy/acrylic/polyurethane/silicone, lap shear strength, peel strength, surface preparation, ASTM D1002/D1876/D903, bonded joint design, thermal limits, aerospace/structural bonding.

adjoint-method-cfd

Adjoint method in CFD — continuous/discrete adjoint, sensitivity derivation, shape optimization, gradient computation, drag minimization, adjoint boundary conditions, OpenFOAM/SU2.

aeroacoustics

Aeroacoustics — Lighthill's equation, Ffowcs Williams-Hawkings (FW-H), trailing-edge noise, tonal vs. broadband noise, Curle's analogy, propeller/fan noise, OASPL prediction, NASA SP-8018.

aeroelasticity

Aeroelasticity — flutter, divergence, control reversal, Theodorsen function, Vg/Vω methods, Collar's triangle, flutter speed prediction, GVT, FAR 25.629, MIL-A-8870.

afterburner-design

Afterburner (reheat) design — V-gutter flameholder, fuel injection, combustion efficiency, turbine exit conditions, augmentation ratio, screech/buzz instability, military jet engine thrust augmentation.

agitator-design

Agitator/mixer design — impeller type selection, Power number/Flow number, Reynolds number for mixing, blend time, gas-liquid mixing, scale-up, baffles, ASME mixing vessel, Rushton turbine, pitched blade.

air-bearing

Air bearings — hydrostatic vs. aerodynamic, load capacity, stiffness, orifice/porous compensation, squeeze film, precision spindles, cleanroom applications, ISO 12849 design.

air-preparation

Compressed air preparation — filtration/regulation/lubrication (FRL), drying (refrigerant/desiccant), air quality ISO 8573-1, dew point, pressure drop, compressor selection, ISO 4414.

aircraft-structures

Aircraft structural analysis — wing bending/torsion, shear flow, semi-monocoque, idealized sections, flutter, fail-safe/damage tolerance, FAR 25 loads, structural weight estimation.

airfoil-aerodynamics

Airfoil aerodynamics — lift and drag, thin airfoil theory, NACA sections, angle of attack, stall, Cl vs α curves, boundary layer, induced drag, finite wing theory, Prandtl lifting line.

airframe-fatigue

Airframe fatigue — safe-life/damage-tolerant/fail-safe design philosophies, spectrum loading, crack growth da/dN, AFGROW/NASGRO, gust spectrum (FAR 25.571), structural test articles, MIL-STD-1530.

aluminum-alloys

Aluminum alloy designation, tempers, properties table (2xxx, 5xxx, 6xxx, 7xxx), weldability, formability, corrosion resistance, selection guide, casting alloys.

am-build-orientation

AM build orientation — anisotropy effects, surface finish vs. orientation, support minimization, staircase effect, thermal gradient, LPBF/FDM/SLA orientation strategies, build time estimation.

am-fatigue-metal

Metal AM fatigue — LPBF/DED fatigue properties, porosity effects, surface finish, residual stress, HIP treatment, S-N comparison to wrought, ASTM E466, crack initiation mechanisms.

am-lattice-structures

AM lattice structures — topology types (BCC/FCC/TPMS), relative density, Gibson-Ashby scaling, mechanical properties, heat exchanger lattices, energy absorption, manufacturability constraints.

am-post-processing-metal

Metal AM post-processing — stress relief, HIP (hot isostatic pressing), machining AM parts, surface finish improvement (media blasting/electropolishing/vibratory), wire EDM, support removal, quality inspection.

am-quality-control

AM quality control — in-process monitoring (melt pool, layer), CT scanning, porosity analysis, NDT for AM, dimensional accuracy, ASTM F3049/F3122/F3184, qualification strategy.

am-residual-stress

AM residual stress — LPBF/DED stress mechanisms, temperature gradient mechanism (TGM), distortion prediction, stress relief heat treatment, XRD/neutron diffraction measurement, support optimization.

am-support-structures

AM support structures — types (block/tree/lattice/conical), support angle criteria, thermal bridging, removal methods, support optimization, FDM vs. LPBF strategies, Materialise Magics.

annealing

Annealing heat treatment — full annealing, process annealing, recrystallization, stress relief, spheroidize annealing, atmosphere control, steel/aluminum/copper, grain growth, ASTM A322.

arch-analysis

Arch structural analysis — three-hinged/two-hinged/fixed arches, thrust line, parabolic arch, horizontal thrust, influence lines, buckling, concrete arches, AISC/ACI arch design.

attitude-control

Spacecraft attitude determination and control system (ADCS) — Euler equations of rigid body rotation, reaction wheels (momentum exchange), magnetorquers (magnetic dipole), thrusters (torque arm), attitude sensors (star tracker, sun sensor, magnetometer,…

audit-calculator

Run the 5-dimension gold standard audit on any MechCodex calculator. Checks theory depth, diagram quality, design tools, sidebar sections, chart panels. Outputs pass/fail per dimension with specific fixes.