초록 ▼

A low-noise level landing apparatus for helicopters comprises a helicopter position calculator for calculating the position of the helicopter, a data input device, an air data sensor for measuring an airspeed and a descending angle, a rotor tachometer for detecting a rotor rotational speed, a memory

A low-noise level landing apparatus for helicopters comprises a helicopter position calculator for calculating the position of the helicopter, a data input device, an air data sensor for measuring an airspeed and a descending angle, a rotor tachometer for detecting a rotor rotational speed, a memory and a fuel gauge for calculating the weight of the helicopter, a rotor rotational speed controller for controlling the rotor rotational speed, a BVI noise generating area database device for storing noise levels in accordance with parameters of descending speed, airspeed, descending angle, rotor rotational speed and weight of the helicopter. A computer selects a flight route, an airspeed, a descending angle and a rotor rotational speed wherein noise is reduced, by setting a plurality of flight routes on the basis of the helicopter position and landing point and by referring to the noise generating area database device. Low-noise level landing is then carried out by pilot manual control or automatic flight control. By modifying the selected flight route on the basis of ground noise data received by a data receiver, the optimal flight route is reselected. As a result, a flight route wherein noise reduction can be attained during landing can be selected more properly.

대표청구항 ▼

[What is claimed is:] [1.]data receiving means for receiving noise data measured on a ground by data communication;helicopter position calculating means for calculating a position of the helicopter;landing route setting means for setting a landing route;air data measuring means for measuring an airs

[What is claimed is:] [1.]data receiving means for receiving noise data measured on a ground by data communication;helicopter position calculating means for calculating a position of the helicopter;landing route setting means for setting a landing route;air data measuring means for measuring an airspeed and a descending speed;rotor rotational speed measuring means for measuring a rotor rotational speed;helicopter weight measuring means for measuring a weight of the helicopter;noise generating area database means for storing noise levels with respect to parameters of descending speed, airspeed, descending angle, rotor rotational speed and weight of helicopter; andflight route calculating means for determining a low-noise level flight route by setting a plurality of flight routes on the basis of the helicopter position and landing point and by referring to the noise generating area database with regard to those data from each measuring means,wherein the flight route calculating means modifies a preselected flight route on the basis of the noise data from the data receiving means, and reselects an optimal flight route.