Sound-absorbing panel with a cellular core and a de-icing system

An air intake structure for a nacelle of an aircraft, the air intake structure delimiting a channel and comprising:

• a lip having a U-shaped cross section oriented towards the rear;
• a first sound-absorbing panel fixed behind the lip and delimiting the channel, the first sound-absorbing panel comprising:
• a first inner skin traversed by holes and oriented towards a channel in which a fluid flows;
• a heating mat comprising a plurality of strips fixed to the first inner skin on the side opposite to the channel and oriented in a first direction, where two adjacent strips are distant from each other in order to define a slot between them;
• a base fixed to the plurality of strips on the side opposite to the first inner skin, where the base comprises, on the strips side, grooves extending in a second direction different from the first direction and where the base has, between two successive grooves, a rib;
• a cellular core fixed to the base on the side opposite to the strips;
• and
• a first outer panel fixed to the cellular core on the side opposite to the base;
• a second sound-absorbing panel fixed behind the first sound-absorbing panel and comprising a cellular core fixed between a second inner skin pierced with holes and oriented towards the channel and a second outer panel oriented in the opposite direction,
• wherein the first sound-absorbing panel is configured to attenuate a first range of frequencies and the second sound-absorbing panel is configured to attenuate a second range of frequencies, and
• wherein the second range of frequencies is higher than the first range of frequencies.