Method for producing a vane comprising a reinforced cavity

A method for manufacturing a turbomachine vane made of composite material and having a cavity, comprising:

• making a core with a shape of the cavity of the vane to be manufactured, said core comprising a reinforcing structure occupying only part of the volume of the core, a remaining volume of the core being occupied by a material of a fleeting nature, the reinforcing structure having at least partly lattice architecture consisting of a three-dimensional set of bars,
• forming a composite material skin around the core, and
• eliminating the fleeting material to obtain a composite material vane with a cavity reinforced by the reinforcing structure,
• wherein at least one bar of the three-dimensional set of bars extends from an inner wall of the composite material skin to an opposite inner wall of the composite material skin,
• wherein the reinforcing structure comprises at least one support element joining two walls of the cavity facing each other, and
• wherein the method further comprises studying natural modes of vibration of the walls of the cavity in order to determine a location of anti-nodes of the natural modes of vibration, the support element being positioned on one or several of the antinodes of the natural modes of vibration of the walls of the cavity.