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Herschel Undergoes Acoustic And Vibration Tests

A picture of the Herschel spacecraft being prepared for acoustic tests. On 5 and 6 June 2008, the Herschel spacecraft successfully passed its acoustic tests. During the tests, the spacecraft was subjected to acoustic noise, generated to simulate the noise levels during launch, at the European Space Research and Technology Centre's Large European Acoustic Facility (LEAF). Credits: ESA (A. Le Floc'h)
by Staff Writers
Paris, France (ESA) Jul 01, 2008
The Herschel spacecraft is now undergoing a series of mechanical tests at ESA's European Space Research and Technology Centre, ESTEC. The tests are carried out to ensure that the spacecraft can withstand the acoustic and vibration loads that it will encounter during launch.

The vibration tests were started on Friday, 20 June and will be completed next week. In the video, taken on 23 June, the spacecraft can be seen fastened on an electrodynamic shaker inside a clean room.

It is seen being shaken along its longitudinal axis (the X-axis) at frequencies starting from 4 Hertz, increasing to 100 Hertz over a period of about 80 seconds.

Such vibration tests will also be performed along the two lateral axes (the Y and the Z axis), four times each, with differing loads each time. The spacecraft's electronic components are checked for normal functionality before and after each run.

Earlier this month, on 5 and 6 June, Herschel successfully passed the acoustic test. During the test, the spacecraft was subjected to acoustic noise, generated to simulate the noise levels that it will encounter during launch.

The test was carried out at ESTEC's Large European Acoustic Facility (LEAF).

The Herschel infrared observatory's telescope will carry the largest mirror ever flown in space. With this telescope and its three science instruments, it will observe and study relatively cool objects everywhere in the Universe, in unprecedented detail. Herschel will study the birth and evolution of a wide range of celestial bodies - from stars in our own backyard to distant galaxies.

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Russian-US Launch Firm To Put Satellite In Orbit In August
Moscow (RIA Novosti) Jun 30, 2008
The Russian-American joint venture International Launch Services (ILS) has started preparations for the first launch of a Proton-M rocket since one partially failed in March, the Khrunichev State Research and Production Center said Friday.

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