Rotational Hard Stop

Purpose

Ideal rotational hard stop

Library

Mechanical / Rotational / Components

Description

The Rotational Hard Stop models an ideal one- or two-sided hard stop in a rotational system, which restricts the relative displacement of the two flanges between an upper and lower limit. While the displacement is within the limits, no torque is transmitted. When the displacement hits either limit, the displacement is clamped at the limit and the flanges become rigidly connected until the transmitted torque reverses.

Fig. 287 shows the displacement/torque characteristic and the state chart of the component.

Fig. 287 Rotational hard stop displacement/torque characteristic and state chart

Parameters

Upper limit

The maximum displacement \(\theta_{\mathrm{max}}\) between the flanges. Set to inf to disable this limit.

Lower limit

The minimum displacement \(\theta_{\mathrm{min}}\) between the flanges. Set to -inf to disable this limit.

Initial displacement

The initial displacement of the flanges, in radians. May be specified in order to provide proper initial conditions if absolute angles are measured anywhere in the system. Otherwise, this parameter can be left blank.

Probe Signals

Torque

The transmitted torque \(\tau\) flowing from the unmarked to the marked flange, in newton-meters \((\mathrm{Nm})\).

Displacement

The displacement \(\theta\) of the marked flange with respect to the unmarked flange, in radians.

State

The internal state of the component: -1 in lower limit, 0 inside limits, +1 in upper limit.