🛞 Hydropneumatic Suspension Strut: Gas Spring and Orifice Damper (2D side view)

2D side view of a hydropneumatic suspension strut: a polytropic gas spring and a quadratic orifice damper under a sprung mass driven by a rough road. Same RK4 solver files as the 3D page, with equilibrium, natural-frequency and energy-balance checks.