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| The US Army wants to reduce helicopter noise |
US Army researchers consider helicopter noise reduction technology a top priority in aircraft design so that helicopters can visualize how troops and supplies will silently move to the battlefield in the future. .
The US Army has made it a priority to develop a quiet helicopter design so that these vehicles can operate while monitoring and transporting cargo without the noise of conventional helicopters.
The US military sees eVTOL as a potential solution, which means future military helicopters could look like unmanned aerial vehicles.
The Army is studying the acoustic properties of vertical electric take-off and landing aircraft with distributed electric motors.
The VTOL helicopter would rise directly into the air and then land in the same manner.
Consumers and many commercial drones also use this design, although there are significant differences between propellers.
Helicopter fans are very large and make a lot of noise, while drones have several small propellers to reduce the noise level.
The US Army plans to develop this type of helicopter for future helicopters that could use an electric VTOL platform with smaller propellers.
The army said in a press release: It may differ from what we are used to from helicopters.
The research was used to confirm that eVTOL produces different types of noise and indicated that axial fans can reduce noise and improve performance compared to conventional fans, where the fans are placed in an aircraft.
"I believe that axial fans with multi-height blades could be useful for eVTOL applications," said George Jacobles, a military research engineer at the Bureau of Vehicle Technology.
He added: Increasing the degree of design freedom could improve the efficiency and control of the audio signal, as the results showed, but more research is needed to reduce axial clearance noise.