The dynamic equation of cracked rotor in rotational frame was modelled, the numerical simulation solutions of the cracked rotor and the uncracked rotor were obtained. By the wavelet transform, the time frequency prope...The dynamic equation of cracked rotor in rotational frame was modelled, the numerical simulation solutions of the cracked rotor and the uncracked rotor were obtained. By the wavelet transform, the time frequency properties of the cracked rotor and the uncracked rotor were discussed, the difference of the time frequency properties between the cracked rotor and the uncracked rotor was compared. A new detection algorithm using wavelet transform to identify crack was proposed. The experiments verify the availability and validity of the wavelet transform in identification of crack.展开更多
The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was presented for the on-line separation and detection of mixture of peptides. With th...The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was presented for the on-line separation and detection of mixture of peptides. With the ultra-high resolution and unmatchable mass measurement accuracy FT-ICR-MS provides, the separation and identification of angiotensin III, octreotide and elastin chemotactic were successfully achieved using this fabricated device, which showed its great application potential in detection and structural identification for multicomponent sample.展开更多
Complex surface shape measurement has been a focus topic in the CAD/CAM field. A popular method for measuring dimensional information is using a 3D coordinate measuring machine (CMM)with a touch trigger probe. The mea...Complex surface shape measurement has been a focus topic in the CAD/CAM field. A popular method for measuring dimensional information is using a 3D coordinate measuring machine (CMM)with a touch trigger probe. The measurement set up with CMM, however, is a time consuming task and the accuracy of the measurement deteriorates as the speed of measurement increase. Non-contact measurement is favored since high speed measurement can be achieved and problems with vibration and friction can be eliminated. Although much research has been conducted in non-contact measurement using image capturing and processing schemes, accuracy is poor and measurement is limited. Some optical technologies developed provide a good accuracy but the dynamic range and versatility is very limited. A novel fiber-optic sensor used for the inspection of complex internal contours is presented in this paper, which is able to measure a surface shape in a non-contact manner with high accuracy and high speed, and is compact and flexible to be incorporated into a CMM. Modulation functions for tilted surface shape measurement, based on the Gaussian distribution of the emitting beam from single-mode fiber (SMF), were derived for specular reflection. The feasibility of the proposed measurement principle was verified by simulations.展开更多
基金National Fundam ental Foundation ofResearch and Developm ent (No.G19980 2 0 3 2 1)
文摘The dynamic equation of cracked rotor in rotational frame was modelled, the numerical simulation solutions of the cracked rotor and the uncracked rotor were obtained. By the wavelet transform, the time frequency properties of the cracked rotor and the uncracked rotor were discussed, the difference of the time frequency properties between the cracked rotor and the uncracked rotor was compared. A new detection algorithm using wavelet transform to identify crack was proposed. The experiments verify the availability and validity of the wavelet transform in identification of crack.
基金supported by the National Natural Science Foundation of China (20035010 and 20175033) and Instrumental Innovation Project of Chinese Academy of Sciences.
文摘The coupling of capillary electrophoresis to electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was presented for the on-line separation and detection of mixture of peptides. With the ultra-high resolution and unmatchable mass measurement accuracy FT-ICR-MS provides, the separation and identification of angiotensin III, octreotide and elastin chemotactic were successfully achieved using this fabricated device, which showed its great application potential in detection and structural identification for multicomponent sample.
文摘Complex surface shape measurement has been a focus topic in the CAD/CAM field. A popular method for measuring dimensional information is using a 3D coordinate measuring machine (CMM)with a touch trigger probe. The measurement set up with CMM, however, is a time consuming task and the accuracy of the measurement deteriorates as the speed of measurement increase. Non-contact measurement is favored since high speed measurement can be achieved and problems with vibration and friction can be eliminated. Although much research has been conducted in non-contact measurement using image capturing and processing schemes, accuracy is poor and measurement is limited. Some optical technologies developed provide a good accuracy but the dynamic range and versatility is very limited. A novel fiber-optic sensor used for the inspection of complex internal contours is presented in this paper, which is able to measure a surface shape in a non-contact manner with high accuracy and high speed, and is compact and flexible to be incorporated into a CMM. Modulation functions for tilted surface shape measurement, based on the Gaussian distribution of the emitting beam from single-mode fiber (SMF), were derived for specular reflection. The feasibility of the proposed measurement principle was verified by simulations.
