# Doppler effect ## Overview The shift in frequency of waves when the source and observer move relative to each other. ## Acoustics bridge Acoustic tuning ## Hub connections ### Engineering Center of Excellence Secondary acoustic application context (to be developed). ### Advanced Manufacturing Center of Excellence Secondary acoustic application context (to be developed). ### Transportation Center of Excellence (primary) This article bridges [[PORTAL_Acoustics]] to the [[WT!Transportation_Center_of_Excellence]]. The acoustic signature of doppler effect is central to transportation operations. ### Energy Center of Excellence Secondary acoustic application context (to be developed). ### IT Center of Excellence Secondary acoustic application context (to be developed). ### HealthForce Center of Excellence Secondary acoustic application context (to be developed). ### Northern Agricultural Center of Excellence Secondary acoustic application context (to be developed). ### Southern Agricultural Center of Excellence Secondary acoustic application context (to be developed). ### Space Mining In Minnesota — Center Circle Secondary acoustic application context (to be developed). --- *Bridge article, scaffolded from [[PORTAL_Acoustics]]. Minimal content; awaiting expansion.*