What are the key considerations in designing vehicle closure systems (doors, hood, trunk)?

Closure design considerations include: Structural requirements (door impact beam, hinge stiffness, latch strength), sealing (weather protection, acoustic isolation), kinematics (swing arc, clearance, effort), mass (affects door sag, hinge wear), safety (child locks, anti-pinch), and perceived quality (sound, effort, feel). Doors must support window regulators, mirrors, speakers while meeting crash and NVH requirements. Latching systems require reliable engagement, easy release, and crash-rated strength. Design balances all requirements while meeting opening/closing effort targets (typically 30-50 N).