MIL-STD-1822A(USAF)
using instrumented bomb test units, this has been found to be prohibitively expensive and so other means of producing the required data have been developed. Bomb case loads for external carriage are generally predicted (using 6 DOF M&S) based on the aerodynamic characteristics which have been measured in wind tunnel tests and the performance characteristics of the aircraft.
4.3.1.4 Static ejection tests.
Static ejection tests are run for initial compatibility and whenever questions arise about the magnitude of shock spectra that will be imposed on bomb components during ejection. A newly designed or redesigned rack will undergo static ejection testing. When an ejector cartridge's performance is changed, the modified cartridge will require static ejection testing. Static ejection tests can also be used to help determine the bomb pitch and ejection velocity that will occur during weapon release. The test configuration generally consists of a DoD supplied rack mounted on a relatively rigid beam with the SNL-supplied Static Ejection Test Unit (SETU). The SETU is a specially designed test unit containing components that have been instrumented to measure the shock spectra; data is collected for later analysis. The unit is ejected off the rack and the acceleration data spectra are recorded. A video of the test is usually recorded using a high speed camera to record pitch angle and velocity information. The tests may be run at a contractor facility or at a DoD engineering facility. These tests may also be run with the rack mounted on a real aircraft in order to get real-world (less severe) results.
4.3.1.5 Electromagnetic (EM) test and analysis.
Modern military aircraft are exposed to a very complex electromagnetic environment. Onboard sources include UHF, VHF, and EHF communication transmitters, radars, and electronic warfare equipment such as Electronic Counter-Measures (ECM) pods. The aircraft may also be exposed to significant EM fields due to external sources such as radars and communication transmitters both on the ground and on nearby aircraft. In general, nuclear weapons are designed to be safe and reliable when exposed to a set of EM environments that are specified in the Stockpile-to-Target Sequence (STS). These environments include the EM exposure that a bomb will see when carried on the aircraft specified in the MCs. When a new aircraft is designed that has a requirement to carry nuclear weapons, the EM environments at weapon carriage points must be determined to verify that they are below the STS limits. Aircraft with an established nuclear weapon capability may have new equipment added to its store list and this new equipment may change the expected EM environments at nuclear weapon carriage locations. Again, the EM exposure that the weapons will see must be determined. Predictions of the electromagnetic fields expected at nuclear weapon locations due to radiators on new aircraft or new radiators on existing aircraft are usually generated by the DoD (by either a contractor or by a DoD engineering laboratory) based on radiator design parameters such as the peak and average power, antenna gain, and physical proximity to weapon locations. SNL engineers may also perform some worst case calculations based on these same parameters. If the field strength predictions are remotely close to the weapon design limits, a test will be conducted on the aircraft to determine the actual field strength.
4.3.1.6 Survivability analyses and test.
Nuclear survivability requirements are included in the STS for nuclear weapons. Nuclear weapons and their delivery aircraft are designed to be safe and reliable when exposed to the set of nuclear effects environments specified in the STS. Support equipment may experience nuclear effects environments on the ground, which is one phase in the STS. If support equipment is not survivable, nuclear weapons cannot be employed in their prescribed manner. Nuclear environments are typically specified for different operational employment phases of the weapon's life cycle. These environments include thermal, overpressure, gust, and ionizing
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