11/27/2023 0 Comments Rugged obsidian 9![]() This is one of the reasons why The Silencer Sound Standard requires examining multiple sound signature metrics. The FRP phenomenon cannot always be shown by viewing only the peak sound pressure. PEW Science note: First-round sound signatures always differ from subsequent shots, as the atmosphere within the silencer changes. Regardless of this measured early-time phenomenon, the overall shape of the impulse waveforms measured at the muzzle, from shot-to-shot, are extremely consistent, highlighting the silencer’s overall sound performance consistency at the muzzle after the FRP, as well as the relative consistency of the tested semiautomatic firearm configuration. Waveforms measured at the shooter’s ear indicate that this early-time peak event is non-trivial ( PEW Science members can read the continuation of this discussion in the member’s-only version of this review). Therefore, the early-time peaks in Shot 1 and Shot 4 may result from events other than sustained combustion. The combination of the measured timing of sound pressure peaks and the peak impulse timing indicates that the FRP behavior of the silencer measured at the muzzle is not a result of the event occurring at the earliest peak. The behavior of the MOD9 FS in this test and this somewhat erratically occurring (but consistent in impulse amplitude) early-time gas pulse can easily be seen in the sharp initial impulse rise of Shots 1 and 4 beginning at a time of approximately 29.9 milliseconds (Fig 4b). Shots 2, 3, and 5) is the differing sound signature between the two groups characterized by the aforementioned higher early-time gas pulses. The reason for the data acquisition triggering time discrepancy between the two shot groups (Shots 1 and 4 vs. This is clearly illustrated in Fig 4a the impulse histories for the other three shots are shifted in time by approximately 1 millisecond. ![]() Note that Shot 1 and Shot 4 both possess higher early-time gas pulses which resulted in earlier PEW-SOFT triggering time. ![]() Figure 4a also shows FRP in the impulse regime. The measured pressure regime first-round-pop (FRP) is evident when comparing Shot 1 (Fig 1) to Shot 2 (Fig 3b). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |