Smart Elastomer Seal with Remote Monitoring for Condition Based Maintenance

NASA is developing a common launch infrastructure to support multiple types of rockets. In order to reduce cost and simplify service of infrastructure, automation of multiple processes is highly desirable. In this approach, Autonomous Control Technologiesperform functions such as anomaly and fault detection, fault isolation, diagnostics and prognostics for critical components. There is a clear need for instrumented monitoring of critical seal components of the propellant delivery system, since a loss of propellant lines integrity can cause great damage, as learned from the Challenger accident, which was caused by a faulty O-ring. A team of physicists and engineers from AT-Tek will design, fabricate, and test an inexpensive elastomer seal with an embedded sensor that can be in-situ-interrogated by compact electronics built into the vacuum flange. The integrated “smart seal” package can self-monitor such parameters as compression and elasticity of the seal material, both of which are critical for preventing catastrophic seal failures. Compared to previous attempts, AT-Tek’s novel approach will dramatically increase the sensitivity of the detection of critical seal parameters and realize a practical smart seal for the first time. The ultimate goal of this innovation is to integrate a smart seal into an autonomous propellant management infrastructure, thus enabling condition-based maintenance (not time-based) of critical elastomer seals for the first time. Another advantage of seal monitoring is ability to detect degradation of the seal before actual failure, with an option to adjust process parameters (pressure, temperature, etc) or bypass the degrading connection without aborting the process. This willminimize the risk of failure even if maintenance of degrading seal is not readily possible. If successful, the AT-Tek smart seal will form another smart assetintegrated into NASA’s Autonomous Control Technologies system.