https://meetings-archive.aps.org/nef/2014/e3/3/
Theory of self-oscillation and mode locking in a longitudinal photoacoustic resonator - Fall 2014...
The wave equation for pressure that governs generation of the photoacoustic effect possesses a forcing term proportional to the time derivative of the energy de
theory ofself oscillationmode lockinglongitudinalphotoacoustic
https://www.amm.shu.edu.cn/EN/Y1988/V9/I8/737
ON SELF-EXCITED OSCILLATION OF DYNAMIC SYSTEMS WITH GAP
dynamic systemsselfexcitedoscillationgap