The latest version of ASTM 2291-11 was published with new instantaneous combined acceleration egg plots that were reshaped to allow for accelerations less than 200 ms to fall outside the allowable limits. When re-evaluating the center of the ellipse, it was determined that the boundary lines should be centered at a location that includes gravity. The proposed language and figures update the current language to re-center the limit curves with a center point that includes gravity. This update only applies to the combination curves that have Z direction accelerations.
Keywordsacceleration limits; amusement ride or devices; anti-rollback devices; chain; clearance envelope; containment; control systems; design; electrical; emergency safety device; fasteners; fatigue; fencing; guardrails; hydraulics; impact factor; loads and strengths; mechanical systems; operational hours; pneumatics; restraints; ride analysis; welding; wire rope; Amusement rides/devices; Design--consumer products/applications;
Draft Under Development