A method for detecting faults of a structure, by means of a device for detecting faults of a structure, the device comprising a calculation unit and a plurality of transducers intended to be positioned on or in the structure, - first transducers of the plurality of transducers being capable of being in an emission mode where they emit an excitation signal, - second transducers of the plurality of the transducers being capable of being in a reception mode where they receive a reception signal in response to the excitation signal emitted by a first transducer in the emission mode, the excitation signals and the reception signals being capable of propagating along the structure or in the structure, the first transducers forming a hexagonal meshing so as to delimit between them several mutually adjacent mesh cells, the second transducers being positioned on respective emission circles of the first transducers, each emission circle of a first transducer being centered on the first transducer, a meshing consisting of a plurality of mesh cells and defined by the plurality of transducers having been previously positioned on or in the structure, the method comprising the steps consisting of: - extracting,, depending on the excitation signals emitted by the first transducers and on the reception signals received by the second transducers, a signature for each of the mesh cells, - comparing the signatures to one another to identify, among the mesh cells, at least one mesh cell as localizing a fault of the structure, called a faulty mesh cell, when the signature of this mesh cell is different from several other signatures of several other mesh cells, the extraction and comparison steps being implemented by the calculation unit, wherein the mesh cells are equilateral triangles of which each vertex corresponds to the position of a first transducer, wherein the positioning of the transducers 100 is considered to be a positioning of their projection on a horizontal plane with two dimensions. - first transducers of the plurality of transducers being capable of being in an emission mode where they emit an excitation signal, - second transducers of the plurality of the transducers being capable of being in a reception mode where they receive a reception signal in response to the excitation signal emitted by a first transducer in the emission mode, the excitation signals and the reception signals being capable of propagating along the structure or in the structure, the first transducers forming a hexagonal meshing so as to delimit between them several mutually adjacent mesh cells, the second transducers being positioned on respective emission circles of the first transducers, each emission circle of a first transducer being centered on the first transducer, a meshing consisting of a plurality of mesh cells and defined by the plurality of transducers having been previously positioned on or in the structure, the method comprising the steps consisting of: - extracting,, depending on the excitation signals emitted by the first transducers and on the reception signals received by the second transducers, a signature for each of the mesh cells, - comparing the signatures to one another to identify, among the mesh cells, at least one mesh cell as localizing a fault of the structure, called a faulty mesh cell, when the signature of this mesh cell is different from several other signatures of several other mesh cells, - extracting,, depending on the excitation signals emitted by the first transducers and on the reception signals received by the second transducers, a signature for each of the mesh cells, - comparing the signatures to one another to identify, among the mesh cells, at least one mesh cell as localizing a fault of the structure, called a faulty mesh cell, when the signature of this mesh cell is different from several other signatures of several other mesh cells, the extraction and comparison steps being implemented by the calculation unit, wherein the mesh cells are equilateral triangles of which each vertex corresponds to the position of a first transducer, wherein the positioning of the transducers 100 is considered to be a positioning of their projection on a horizontal plane with two dimensions.