Airmount truck vibration4/19/2023 ![]() Model 22 springs were used for the ignition condition and Model 20-2 springs were used for the burnout condition. For each configuration, three cradles supported the missile, with a pair of Firestone Airmount® springs in each cradle. The test setup for the missile is shown in Figure 1. Two configurations of the missile were tested, with one representing the ignition (full motor) condition and other the burnout (empty motor) condition. The two air springs can be seen along with their air reservoirs. A Cradle is shown with the missile elevated on its saddle. To eliminate these problems, the missile was supported on air springs. The responses of the masses of the slings and chain falls, excited by vibration, influenced the test results. The stretching required frequent readjustments to maintain the proper load distribution and alignment with the shaker. Problems stemming from this setup included continual stretching of the slings and excitation of them under vibration. Previous tests used slings from an overhead structure to support the missile. The missile under test was a short-range air-launched target (SRALT) Hera craft that weighed 21,300 lbs. To achieve accuracy, it is necessary to minimize the influence of the supports on the test results. ![]() For the GVS test, the missile is supported in a horizontal plane and excited at its aft end. conducted ground vibration survey (GVS) tests on the missiles it designs and builds. To obtain more accurate data for use in developing the electronics and algorithms in the guidance system, Coleman Aerospace Corp. The control panel for the air springs is next to the missile Five cradles are located under the missile and the shaker used for exciting it is at the far right. The overall missile is shown in its Test Configuration. Simulating the free vibration condition in the laboratory, however, is a difficult task, since the required supports can affect the test results. When developing the guidance system of a missile, it is necessary to know the resonant frequencies and mode shapes of the missile in flight.
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