Aerosol-generating device and system

An aerosol-generating device, comprising:

• a membrane having an aerosol-generation zone, in which the aerosol-generation zone comprises a plurality of nozzles, the plurality of nozzles being the only nozzles in the aerosol-generation zone;
• and
• an actuator coupled to the membrane,
• wherein the actuator is configured to excite the membrane to induce a vibration of the membrane at one or more predetermined modal frequencies of the membrane such that a liquid aerosol-forming substrate passing through the plurality of nozzles is aerosolised,
• wherein more than 50% of the plurality of nozzles are located closer to antinodes than to nodes of the membrane, where the antinodes and the nodes correspond to the membrane being excited at the one or more predetermined modal frequencies of the membrane,
• wherein the membrane continuously and progressively changes in thickness in a step-free manner from a centre of the membrane to a peripheral edge of the membrane, and
• wherein the aerosol-generating device is configured to selectively apply and release a constraint to the membrane so as to adjust a response of the membrane to the one or more predetermined modal frequencies.