Expert-level biomechanics covering musculoskeletal mechanics, gait analysis, joint biomechanics, soft tissue mechanics, bone mechanics, and sports biomechanics.
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Free body diagram: isolate body segment, include muscle forces and joint reactions. Muscle force estimation: redundant problem, optimization methods required. Moment arm: perpendicular distance from muscle line of action to joint center. Hill muscle model: contractile element, series elastic, parallel elastic components. Force-velocity relationship: muscle force decreases with increasing shortening velocity.
Gait cycle: heel strike to next heel strike, stance 60% and swing 40%. Ground reaction force: measured by force plate, three components. Joint moments: inverse dynamics from kinematics and GRF data. EMG: electromyography measures muscle activation timing and relative magnitude. Kinematics: motion capture tracks marker positions, derives joint angles.
Knee: tibiofemoral and patellofemoral joints, cruciate and collateral ligaments. Hip: ball and socket, high contact forces, cup and stem in total hip replacement. Spine: intervertebral disc mechanics, facet joint loading, core muscle stabilization. Shoulder: glenohumeral instability, rotator cuff muscle coordination.
Bone: cortical and cancellous, anisotropic, viscoelastic, fracture mechanics. Cartilage: biphasic theory, fluid pressurization carries load acutely. Ligament and tendon: nonlinear stress-strain, toe region then linear region. Muscle: active and passive forces, fiber architecture determines function.
| Pitfall | Fix |
|---|---|
| Ignoring muscle co-contraction | Antagonist muscles increase joint loading |
| Static analysis for dynamic activities | Use inverse dynamics for running and jumping |
| Wrong joint center location | Small errors propagate to large moment errors |
| Assuming rigid bone | Include deformation for fracture risk studies |
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Expert-level abstract algebra knowledge. Use when working with groups, rings, fields, modules, Galois theory, representation theory, or algebraic structures. Also use when the user mentions 'group', 'ring', 'field', 'homomorphism', 'isomorphism', 'normal subgroup', 'quotient group', 'Sylow theorem', 'Galois theory', 'polynomial ring', 'ideal', 'module', 'vector space', or 'representation theory'.
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Expert-level acoustics knowledge. Use when working with sound waves, acoustic propagation, resonance, standing waves, Doppler effect, room acoustics, ultrasound, noise control, musical acoustics, or architectural acoustics. Also use when the user mentions 'sound wave', 'decibel', 'frequency', 'resonance', 'standing wave', 'Doppler effect', 'acoustic impedance', 'reverberation', 'ultrasound', 'noise control', 'harmonics', or 'sound intensity'.
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Expert-level aerodynamics covering subsonic and supersonic flow, lift and drag, airfoil theory, boundary layers, compressible flow, and CFD methods.
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Expert-level air quality engineering covering pollutant sources, atmospheric dispersion, air quality standards, emission controls, and air quality modeling.
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Expert-level aircraft structures covering structural design philosophy, wing and fuselage analysis, fatigue and damage tolerance, composite structures, and certification.
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Expert-level algorithms and complexity theory covering sorting, searching, graph algorithms, dynamic programming, greedy algorithms, NP-completeness, and algorithm design paradigms.
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