The Boeing F-15EX or what the US Air Force calls the F-15 Eagle II, and is projected to strengthen the Indonesian Air Force in the future, is reported to have completed the first acoustic tests at Eglin Air Force Base in Florida for the first time.
In addition to the first for the F-15EX, apparently this acoustic test is also the first to be carried out on the F-15 family, which in fact the first prototype flew 50 years ago. Quoted from eglin.af.mil (7/11/2022), it was stated that this acoustic test was carried out to measure the noise level (noise pollution) of the General Electric GE-129 engine.
This acoustic test takes place on the ground and in the air – capturing ground and flight sound, where this acoustic test aims to establish a sound data base to update information about predicted noise levels.
To capture voice data, experts from Blue Ridge Research and Consulting placed more than 100 microphones strategically around the aircraft.
Separately, 45 microphones were deployed 1,200 meters laterally and 305 meters horizontally across the test field to capture sound from more than 70 F-15 Eagle II tests. The tests consisted of ground testing at idle and with the engine running and flight testing at various altitudes and aircraft configurations.
In a quiet open space at Eglin Air Base, an F-15EX Eagle II on a hillside at 152 meters above sea level, with afterburners on, the US Air Force's newest twin engine fighter jet traverses a row of vertical and horizontal microphones on the ground that captures every decibel of sound the plane makes as it roars and begins to turn to pass again.
The above activity is just one of many sound recording processes that have taken place during the F-15's acoustic testing over the past two weeks.
A spokesman for Eglin Field said this was the first acoustic test on an F-15 since the aircraft's initial launch in the early 1970s and the first on a GE-129 engine. The US Department of Defense-initiated tests were carried out exclusively on the F-15EX as it became a new model in the US Air Force inventory.
In more detail, James Potter, Department of the Air Force community planner, said that the purpose of the acoustic test is to establish a baseline for sound data, so the Department of Defense can update noise level predictions and models at the locations where new aircraft will fly and be deployed.
"As the lead test development organization, the Operational Flight Program Combined Test Force (OFP CTF) will conduct an environmental impact study and we are now one step closer to bringing this new aircraft to an operational unit," said First Lt. Zachary Arns, OFP CTF deputy mission support section chief. .
The F-15EX Eagle II is an updated version of the F-15 Eagle fighter jet, it was introduced in 2018 and made its first flight in 2021. The aircraft first launched air-to-air missiles in February 2022. The Eagle II will replace the F-15C/ D Eagle and will be one of the fighter jets that can launch hypersonic missiles.
For the US Air Force, the F-15 Eagle II is planned to be deployed at Kadena Air Base, Japan, implying that acoustic tests are important for the 'acceptance' of the aircraft in the future. Noise is often a problem in deploying fighter jets, such as the case at Udon Thani Air Base (Thailand), where residents around the air base complained about noise pollution caused by the roar of Singapore's F-16 fighter jets.
Sound levels detected during combat exercises at Udon Air Base were measured at 64.8–65.2 decibels, too loud for residential areas. Teachers at a school near the air base must stop class every time a fighter jet takes off, lands, or flies over it. Children were asked to protect their ears from noise. The roar of the F-16 was so loud that it triggered a car alarm and rattled windows and doors.
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