As an essential component of ammunition, pyrotechnics can control ignition with high reliability.However, due to limits of fabrication technology, traditional pyrotechnics are bulky. To achieve both functionality and ...As an essential component of ammunition, pyrotechnics can control ignition with high reliability.However, due to limits of fabrication technology, traditional pyrotechnics are bulky. To achieve both functionality and miniaturization, MEMS pyrotechnics integrate initiator, safety-and-arming(S&A) device and lead charge and keep all components within a small size. MEMS S&A devices, as the core component to ensure system safety, are difficult to achieve active and rapid response to control signals with high safety and reliability. In order to overcome the difficulty, we propose the design and characterization of a MEMS pyrotechnic with a double-layer barrier S&A device. The MEMS pyrotechnic is a high-integrated device with an overall size of 13.4 × 8.5 × 5.2 mm^(3). The initiator is a Ni Cr bridge foil covered with an Al/Cu O energetic film, which can generate flame when ignited by an excitation voltage.To match the flame energy, lead styphnate is chosen in this study as the lead charge. The S&A device contains four semi-circular barriers, which are directly driven by V-shape electro-thermal actuators to gain active control of the pyrotechnics’ ignition condition with rapid response. To improve the system’s reliability, the four barriers are axisymmetrically placed in two layers, two barriers for each layer, to constitute a double-layer structure with a thickness of 100 μm. The ignition test results show that the S&A device can prevent the initiator from detonating the lead charge in safety condition. In arming condition, the lead charge will be detonated.展开更多
The title compound,（E）-ethyl 2-（5-（3-methyl-2-butenyloxy）-2-（3-（4-（3-methyl-2-butenyloxy）phenyl） acryloyl） phenoxy）acetate（1）,has been synthesized and characterized by FT-IR and 1H-NMR spectroscopy,ESI-M...The title compound,（E）-ethyl 2-（5-（3-methyl-2-butenyloxy）-2-（3-（4-（3-methyl-2-butenyloxy）phenyl） acryloyl） phenoxy）acetate（1）,has been synthesized and characterized by FT-IR and 1H-NMR spectroscopy,ESI-MS,and X-ray single-crystal diffraction.FT-IR,1H-NMR and ESI-MS confirm the functional groups,particularly the ethyl groups in the ester moiety,of the compound.The single-crystal X-ray diffraction has revealed a monoclinic structure,space group P21/n with a = 14.6832（14）,b = 7.7581（7）,c = 23.075（2）,β = 101.670（2）o,V = 2574.2（4） ？3,Z = 4,Dc = 1.235 g/cm,μ = 0.085 mm-1,and F（000） = 1024.The skeleton of chalcone in the molecular structure is coplanar.展开更多
基金the National Key R&D Program of China(2017YFB1102900)the Fundamental Research Funds for the Central Universities(xzy012019004).
文摘As an essential component of ammunition, pyrotechnics can control ignition with high reliability.However, due to limits of fabrication technology, traditional pyrotechnics are bulky. To achieve both functionality and miniaturization, MEMS pyrotechnics integrate initiator, safety-and-arming(S&A) device and lead charge and keep all components within a small size. MEMS S&A devices, as the core component to ensure system safety, are difficult to achieve active and rapid response to control signals with high safety and reliability. In order to overcome the difficulty, we propose the design and characterization of a MEMS pyrotechnic with a double-layer barrier S&A device. The MEMS pyrotechnic is a high-integrated device with an overall size of 13.4 × 8.5 × 5.2 mm^(3). The initiator is a Ni Cr bridge foil covered with an Al/Cu O energetic film, which can generate flame when ignited by an excitation voltage.To match the flame energy, lead styphnate is chosen in this study as the lead charge. The S&A device contains four semi-circular barriers, which are directly driven by V-shape electro-thermal actuators to gain active control of the pyrotechnics’ ignition condition with rapid response. To improve the system’s reliability, the four barriers are axisymmetrically placed in two layers, two barriers for each layer, to constitute a double-layer structure with a thickness of 100 μm. The ignition test results show that the S&A device can prevent the initiator from detonating the lead charge in safety condition. In arming condition, the lead charge will be detonated.
基金Supported by the Jiangxi Provincial Department of Education (GJJ08433)Jiangxi Provincial Department of Science and Technology (2008ZD06100)
文摘The title compound,（E）-ethyl 2-（5-（3-methyl-2-butenyloxy）-2-（3-（4-（3-methyl-2-butenyloxy）phenyl） acryloyl） phenoxy）acetate（1）,has been synthesized and characterized by FT-IR and 1H-NMR spectroscopy,ESI-MS,and X-ray single-crystal diffraction.FT-IR,1H-NMR and ESI-MS confirm the functional groups,particularly the ethyl groups in the ester moiety,of the compound.The single-crystal X-ray diffraction has revealed a monoclinic structure,space group P21/n with a = 14.6832（14）,b = 7.7581（7）,c = 23.075（2）,β = 101.670（2）o,V = 2574.2（4） ？3,Z = 4,Dc = 1.235 g/cm,μ = 0.085 mm-1,and F（000） = 1024.The skeleton of chalcone in the molecular structure is coplanar.
