Thermoacoustic device with diaphragm structure

A thermoacoustic device comprising:

• a loop tube in which a working gas is sealed;
• a stack in which a temperature gradient is generated in a tube axis direction of the loop tube, the stack being provided in the loop tube;
• a diaphragm structure including a diaphragm provided in the loop tube, an operation unit, and a controller operating as an electronic control unit, the diaphragm having a surface extending in a direction intersecting the tube axis direction and being configured to vibrate with a component of vibration in the tube axis direction, the operation unit being configured to apply a physical quantity that is required, to the diaphragm to change a rigidity of the diaphragm in the tube axis direction, and the electronic control unit being configured to perform control to change the physical quantity applied to the diaphragm;
• and
• a sensor configured to detect a parameter correlated with a work flow of the working gas, wherein the electronic control unit is configured to perform control to reduce the rigidity of the diaphragm when the parameter changes due to a decrease in the work flow, and to increase the rigidity of the diaphragm when the parameter changes due to an increase in the work flow.