Abstract: A method of determining a trajectory for a rotorcraft, comprising: receiving an initial trajectory defining a planned flight path of the rotorcraft between a starting point and a target point; performing iterations of a loop comprising adding the initial trajectory to a set of selectable trajectories, evaluating a noise indicator of the rotorcraft for the initial trajectory on the basis of a noise-related acoustic footprint and a noise exposure level-related acoustic footprint, adding the evaluated noise indicator to a set of evaluated noise indicators, determining an alternative trajectory defining an alternative flight path of the rotorcraft between the starting point and the target point on the basis of the evaluated noise indicator, and setting the alternative trajectory as initial trajectory; and outputting a trajectory of the set of selectable trajectories associated with a selected noise indicator fulfilling predetermined noise indicator conditions.

Abstract: A method of determining a trajectory for a rotorcraft, comprising: receiving an initial trajectory defining a planned flight path of the rotorcraft between a starting point and a target point; performing iterations of a loop comprising adding the initial trajectory to a set of selectable trajectories, evaluating a noise indicator of the rotorcraft for the initial trajectory on the basis of a noise-related acoustic footprint and a noise exposure level-related acoustic footprint, adding the evaluated noise indicator to a set of evaluated noise indicators, determining an alternative trajectory defining an alternative flight path of the rotorcraft between the starting point and the target point on the basis of the evaluated noise indicator, and setting the alternative trajectory as initial trajectory; and outputting a trajectory of the set of selectable trajectories associated with a selected noise indicator fulfilling predetermined noise indicator conditions.

Abstract: A noise treatment device (D) comprising at least one local noise sound sensor (30) and at least one sound system having a support (11, 12) and at least one sound actuator (21, 22, 21?, 22?). The device also includes a position sensor for determining the position of a person's head, at least one treatment unit (40, 40?) connected to the local noise sound sensor to receive a local noise signal and configured to deliver a control signal to each sound actuator (21, 22, 21?, 22?), the control signal being a function of the local noise signal and of at least one transfer function per ear, and active matching means (70) co-operating with the position sensor in order to keep each transfer function used in preparing each control signal representative of the path to be traveled by the anti-noise.

Abstract: A self-supporting acoustic insulation panel (1) comprising a visible wall (3) that is not self-supporting and an invisible wall (2) that is not self-supporting facing a source (50) of soundwaves. A porous core (20) is arranged between the visible wall (3) and the invisible wall (2), a plurality of link elements (5) each extending from the invisible wall (2) towards the visible wall (3), each link element (5) passing through an orifice (21) in said core (20) and being connected to the visible wall (3) and to the invisible wall (2), each link element (5) separating the visible wall (3) from the invisible wall (2) and mechanically linking the visible wall (3) with the invisible wall (2) while acoustically decoupling the visible wall (3) from the invisible wall (2).

Abstract: A soundproofing covering (10) having resonators (30). Said covering (10) comprises a trellis (20) provided with at least two resonators (30) and at least one stud (50) for fastening at least two resonators (30) to a panel (5) that is to be treated, each resonator (30) including a blade (31) extending longitudinally in a plane (P1) from one end (32) of the resonator (30) that is fastened to a stud (50) to another end (33) of the resonator (30), said blade (31) having at least one transverse protuberance (35) for oscillating in an elevation direction (D1) perpendicular to said plane (P1), each stud (50) extending in elevation from a face for securing to the panel (5) that is to be treated towards each resonator (30) fastened to the stud (50), at least one stud (50) having damper means (60) interposed between said face and each of the resonators (30) fastened to the stud.

Abstract: A self-supporting acoustic insulation panel (1) comprising a visible wall (3) that is not self-supporting and an invisible wall (2) that is not self-supporting facing a source (50) of soundwaves. A porous core (20) is arranged between the visible wall (3) and the invisible wall (2), a plurality of link elements (5) each extending from the invisible wall (2) towards the visible wall (3), each link element (5) passing through an orifice (21) in said core (20) and being connected to the visible wall (3) and to the invisible wall (2), each link element (5) separating the visible wall (3) from the invisible wall (2) and mechanically linking the visible wall (3) with the invisible wall (2) while acoustically decoupling the visible wall (3) from the invisible wall (2).

Abstract: A soundproofing covering (10) having resonators (30). Said covering (10) comprises a trellis (20) provided with at least two resonators (30) and at least one stud (50) for fastening at least two resonators (30) to a panel (5) that is to be treated, each resonator (30) including a blade (31) extending longitudinally in a plane (P1) from one end (32) of the resonator (30) that is fastened to a stud (50) to another end (33) of the resonator (30), said blade (31) having at least one transverse protuberance (35) for oscillating in an elevation direction (D1) perpendicular to said plane (P1), each stud (50) extending in elevation from a face for securing to the panel (5) that is to be treated towards each resonator (30) fastened to the stud (50), at least one stud (50) having damper means (60) interposed between said face and each of the resonators (30) fastened to the stud.

Abstract: An insulating coating (1) with high damping power and suitable for being fastened to a structure (2). The coating comprises a dissipater mesh made up of a plurality of dissipater elements (3) and of nodes (4) with the bottom end (4?) of each node being fastened to said structure (2). Each dissipater element is secured to first and second nodes (6, 7). The bottom ends (4?) of said nodes (4) project from said dissipater elements (3) so as to be suitable for creating an empty space (5) between the dissipater elements (3) and said structure (2). In addition, at least one dissipater element (3) is provided with at least one branch (10, 20) provided with a heavy element (30, 31, 32). The heavy element (30, 31, 32) has a first mass that is greater than or equal to a second mass of said branch (10, 20).

Abstract: A noise treatment device (D) comprising at least one local noise sound sensor (30) and at least one sound system having a support (11, 12) and at least one sound actuator (21, 22, 21?, 22?). The device also includes a position sensor for determining the position of a person's head, at least one treatment unit (40, 40?) connected to the local noise sound sensor to receive a local noise signal and configured to deliver a control signal to each sound actuator (21, 22, 21?, 22?), the control signal being a function of said local noise signal and of at least one transfer function per ear, and active matching means (70) co-operating with said position sensor in order to keep each transfer function used in preparing each control signal representative of the path to be traveled by said anti-noise.

Abstract: An insulating coating (1) with high damping power and suitable for being fastened to a structure (2). The coating comprises a dissipater mesh made up of a plurality of dissipater elements (3) and of nodes (4) with the bottom end (4?) of each node being fastened to said structure (2). Each dissipater element is secured to first and second nodes (6, 7). The bottom ends (4?) of said nodes (4) project from said dissipater elements (3) so as to be suitable for creating an empty space (5) between the dissipater elements (3) and said structure (2). In addition, at least one dissipater element (3) is provided with at least one branch (10, 20) provided with a heavy element (30, 31, 32). The heavy element (30, 31, 32) has a first mass that is greater than or equal to a second mass of said branch (10, 20).