Abstract
This disclosure describes a digital twin of a governed robot that is fit to be relied on for safety decisions. Each robot has one certified twin, a model of its body, actuators, sensors, payload limits and current configuration, bound by cryptographic reference to the robot's portable credential (its passport) and to the hardware identity attested there. The twin is held and run by an independent safety plane, not by the robot's own control software, so that the robot cannot shape the model that judges it. The twin carries a fidelity statement: how closely it is known to match the real machine, measured by declared calibration tests on the real robot, with the date, the method and the measured error. That statement expires after a declared interval, and immediately on any change to the machine, such as a replaced part, new firmware, a changed tool or a collision. An expired or unmatched twin cannot be used to admit actions. Every action admitted on the strength of a twin rehearsal records the twin version used, so that an incident can later be replayed on exactly the model that approved it. The fidelity of the twin limits the robot's autonomy: a robot whose twin is stale or imprecise is held to a lower rung of its governor ladder, with slower speeds, smaller workspaces or human approval, until the twin is renewed. The twin and its history are placed in custody with an accredited holder, so that safety evidence remains available if the maker withdraws support, changes ownership or ceases to exist. Every calibration, renewal, change, use and transfer of custody is a signed record.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Wang, Edward D. H., "SI Robot Twin™: A Certified Digital Twin for Each Governed Robot, Bound to the Robot's Passport and Held by an Independent Safety Plane, with Attested Fidelity that Expires and Must Be Renewed against the Real Machine, a Twin Version Recorded with Every Action It Was Used to Admit, Fidelity that Limits What the Robot May Do, and Custody that Survives the Maker", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/12892