以航空发动机与船舰燃气轮机为代表的高端透平机械在高效率,大机动飞行等工况要求下,内部结构趋于紧凑化和复杂化,使得内部转静子发生碰摩的概率也随之增加,由于其内部少测点、难监测,往往难以及时准确地发现碰摩故障。提出了一种叶尖...以航空发动机与船舰燃气轮机为代表的高端透平机械在高效率,大机动飞行等工况要求下,内部结构趋于紧凑化和复杂化,使得内部转静子发生碰摩的概率也随之增加,由于其内部少测点、难监测,往往难以及时准确地发现碰摩故障。提出了一种叶尖间隙时频特征融合的转子碰摩故障诊断方法,首先通过叶尖振动-间隙复合传感器获取叶尖间隙(blade tip clearance,BTC)序列,然后通过机器学习算法评估BTC序列的异常性;若有异常警报,则对异常信号进行傅里叶分解并汇总各分量的时频能量谱;最后通过时频能量谱中的碰摩带判断故障的发生。试验结果表明,在对转子施加短时、持续碰摩两种工况后,机器学习模型能够实时诊断,且报警后所提方法能完整分辨出两种碰摩的发生,以及持续碰摩缓慢施加、快速结束的过程。通过与转子振动信号进行对比,表明该方法可通过机匣测点获取叶尖间隙并感知转子碰摩故障,实现了“一传多感”,为透平机械的状态监测和健康管理提供了新的方法。展开更多
Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure ...Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure was solved by direct method and refined by full-matrix least-square method. The crystal is monoclinic and belongs to space group Cc with a=2.645 3(5) nm, b= 1.670 4(3) nm, c=1\^821 6(4) nm, β=128.16(3) °, V=6.329(2) nm 3, Z=2 , D c=20.200 Mg/m 3, M r= 1 314.744, μ=10.274 mm -1, F(000) =38 226, GOF=0.99, R=0.094 1, ωR=0.257 3.展开更多
A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, ...A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, was obtained under a mild synthesis condition. The titled compound is crystallized in a monoclinic system, space group P2(1)/c with a=1.584 7(7) nm, b=1.426 7(6) nm, c=1.936 3(6) nm, β=113.186(7)°, V=4.024 6(3) nm 3, Z=4, D X=1.947 mg/m 3, M r=1 179.92, μ=1.662 mm -1, F(000)=2 344, R=0.074 8, wR=0.215 1. Three cadmium centers link with each other through BDC or BTC ligand to form a 3-D open framework.展开更多
文摘以航空发动机与船舰燃气轮机为代表的高端透平机械在高效率,大机动飞行等工况要求下,内部结构趋于紧凑化和复杂化,使得内部转静子发生碰摩的概率也随之增加,由于其内部少测点、难监测,往往难以及时准确地发现碰摩故障。提出了一种叶尖间隙时频特征融合的转子碰摩故障诊断方法,首先通过叶尖振动-间隙复合传感器获取叶尖间隙(blade tip clearance,BTC)序列,然后通过机器学习算法评估BTC序列的异常性;若有异常警报,则对异常信号进行傅里叶分解并汇总各分量的时频能量谱;最后通过时频能量谱中的碰摩带判断故障的发生。试验结果表明,在对转子施加短时、持续碰摩两种工况后,机器学习模型能够实时诊断,且报警后所提方法能完整分辨出两种碰摩的发生,以及持续碰摩缓慢施加、快速结束的过程。通过与转子振动信号进行对比,表明该方法可通过机匣测点获取叶尖间隙并感知转子碰摩故障,实现了“一传多感”,为透平机械的状态监测和健康管理提供了新的方法。
文摘Compound [Co 3(BTC)(HBTC)(H 2BTC)(C 2H 4O 2) 3]·3(DMF)·6(H 3O) was synthesized under mild conditions and its crystal structure was determined by using single crystal X-ray diffraction. The crystal structure was solved by direct method and refined by full-matrix least-square method. The crystal is monoclinic and belongs to space group Cc with a=2.645 3(5) nm, b= 1.670 4(3) nm, c=1\^821 6(4) nm, β=128.16(3) °, V=6.329(2) nm 3, Z=2 , D c=20.200 Mg/m 3, M r= 1 314.744, μ=10.274 mm -1, F(000) =38 226, GOF=0.99, R=0.094 1, ωR=0.257 3.
文摘A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, was obtained under a mild synthesis condition. The titled compound is crystallized in a monoclinic system, space group P2(1)/c with a=1.584 7(7) nm, b=1.426 7(6) nm, c=1.936 3(6) nm, β=113.186(7)°, V=4.024 6(3) nm 3, Z=4, D X=1.947 mg/m 3, M r=1 179.92, μ=1.662 mm -1, F(000)=2 344, R=0.074 8, wR=0.215 1. Three cadmium centers link with each other through BDC or BTC ligand to form a 3-D open framework.
