Xiaofeng Tang - Academia.edu (original) (raw)
Papers by Xiaofeng Tang
In this paper we have researched on a method based on estimate of tire longitudinal stiffness for... more In this paper we have researched on a method based on estimate of tire longitudinal stiffness for tire pressure monitoring. To solve the problem, a self-adaptive nonlinear filter and an optimal FIR derivative have been designed and applied to vehicle speed calculation and acceleration estimate respectively. Finally, the Least Squares method based on pattern search is adopted to estimate the
ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system ... more ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system and the TPMS system are mutually independent; the article proposed a merged thought between the two. Using fuzzy PID adaptive control algorithm realized two kinds of functions, and using mat lab tool simulates system. The simulation result showed that the fusion thought proposed in this article guaranteed to control slipping rate and monitored tire pressure, which explained system feasibility and saved cost simultaneously.
In this paper we have researched on a method based on estimate of tire longitudinal stiffness for... more In this paper we have researched on a method based on estimate of tire longitudinal stiffness for tire pressure monitoring. To solve the problem, a self-adaptive nonlinear filter and an optimal FIR derivative have been designed and applied to vehicle speed calculation and acceleration estimate respectively. Finally, the Least Squares method based on pattern search is adopted to estimate the
ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system ... more ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system and the TPMS system are mutually independent; the article proposed a merged thought between the two. Using fuzzy PID adaptive control algorithm realized two kinds of functions, and using mat lab tool simulates system. The simulation result showed that the fusion thought proposed in this article guaranteed to control slipping rate and monitored tire pressure, which explained system feasibility and saved cost simultaneously.
Chemical Physics, 2011
Using the novel threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging technique... more Using the novel threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging technique, the dissociative photoionization of N 2 O molecule via the C 2 + ionic state has been investigated. Four fragment ions, NO + , N 2 + , O + , and N + , are observed, respectively, and the NO + and N + ions are always dominant in the whole excitation energy range of the C 2 + ionic state. Subsequently, the TPEPICO three-dimensional time-sliced velocity images of NO + dissociated from the vibrational state-selected N 2 O + (C 2 + ) ions have been recorded. Thus the kinetic and internal energy distributions of the NO + fragments have been obtained directly as the bimodal distributions, suggesting that the NO + fragments are formed via both NO + (X 1 + ) + N( 2 P) and NO + (X 1 + ) + N( 2 D) dissociation channels. Almost the same vibrational population reversions are identified for both dissociation pathways. Interestingly, the obtained branching ratios of the two channels exhibit some dependence on the excited vibrational mode for N 2 O + (C 2 + ), in which the excited asymmetrical stretching potentially promotes dissociation possibility along the NO + (X 1 + ) + N( 2 D) pathway. In addition, the measured anisotropic parameters of NO + are close to 0.5, indicating that the C 2 + state of N 2 O + is fully predissociative, indeed, with a tendency of parallel dissociation, and therefore, the corresponding predissociation mechanisms for the N 2 O + (C 2 + ) ions are depicted.
Review of Scientific Instruments, 2009
A novel threshold photoelectron-photoion coincidence ͑TPEPICO͒ imaging spectrometer at the U14-A ... more A novel threshold photoelectron-photoion coincidence ͑TPEPICO͒ imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is applied to magnify images of photoelectrons instead of traditional accelerating electric field in order to suppress the contribution of energetic electrons in the threshold photoelectron spectroscopy ͑TPES͒ and the mass-selected TPEPICO spectroscopy. The typical energy resolution of TPES is measured to be 9 meV ͑full width at half maximum͒, as shown on the 2 P 1/2 ionization of argon. The measured mass resolving power for the present TPEPICO imaging spectrometer is above 900 of M / ⌬M. Subsequently as a benchmark, oxygen molecule is photoionized by monochromatic synchrotron radiation at 20.298 eV and dissociates to an oxygen atomic ion and a neutral oxygen atom, and the translation energy distribution of oxygen atomic ion is measured by the time-sliced imaging based on mass-selected TPEPICO experiment. The kinetic energy resolution of the present ion velocity imaging is better than 3% of ⌬E / E.
To improve the real-time property for typical Pulse Doppler radar simulation, an idea of signal-l... more To improve the real-time property for typical Pulse Doppler radar simulation, an idea of signal-level simulation using hardware was proposed. The system framework and information flow was studied, then a host method of moving target echo simulation was given. Most of all, radar signal processing was realized by FPGA, which includes digital quadrature detection with IF sampling, pulse compression based
In this paper we have researched on a method based on estimate of tire longitudinal stiffness for... more In this paper we have researched on a method based on estimate of tire longitudinal stiffness for tire pressure monitoring. To solve the problem, a self-adaptive nonlinear filter and an optimal FIR derivative have been designed and applied to vehicle speed calculation and acceleration estimate respectively. Finally, the Least Squares method based on pattern search is adopted to estimate the
ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system ... more ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system and the TPMS system are mutually independent; the article proposed a merged thought between the two. Using fuzzy PID adaptive control algorithm realized two kinds of functions, and using mat lab tool simulates system. The simulation result showed that the fusion thought proposed in this article guaranteed to control slipping rate and monitored tire pressure, which explained system feasibility and saved cost simultaneously.
In this paper we have researched on a method based on estimate of tire longitudinal stiffness for... more In this paper we have researched on a method based on estimate of tire longitudinal stiffness for tire pressure monitoring. To solve the problem, a self-adaptive nonlinear filter and an optimal FIR derivative have been designed and applied to vehicle speed calculation and acceleration estimate respectively. Finally, the Least Squares method based on pattern search is adopted to estimate the
ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system ... more ABS and TPMS is a technical measure enhanced automobile initiative security. Nowadays ABS system and the TPMS system are mutually independent; the article proposed a merged thought between the two. Using fuzzy PID adaptive control algorithm realized two kinds of functions, and using mat lab tool simulates system. The simulation result showed that the fusion thought proposed in this article guaranteed to control slipping rate and monitored tire pressure, which explained system feasibility and saved cost simultaneously.
Chemical Physics, 2011
Using the novel threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging technique... more Using the novel threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging technique, the dissociative photoionization of N 2 O molecule via the C 2 + ionic state has been investigated. Four fragment ions, NO + , N 2 + , O + , and N + , are observed, respectively, and the NO + and N + ions are always dominant in the whole excitation energy range of the C 2 + ionic state. Subsequently, the TPEPICO three-dimensional time-sliced velocity images of NO + dissociated from the vibrational state-selected N 2 O + (C 2 + ) ions have been recorded. Thus the kinetic and internal energy distributions of the NO + fragments have been obtained directly as the bimodal distributions, suggesting that the NO + fragments are formed via both NO + (X 1 + ) + N( 2 P) and NO + (X 1 + ) + N( 2 D) dissociation channels. Almost the same vibrational population reversions are identified for both dissociation pathways. Interestingly, the obtained branching ratios of the two channels exhibit some dependence on the excited vibrational mode for N 2 O + (C 2 + ), in which the excited asymmetrical stretching potentially promotes dissociation possibility along the NO + (X 1 + ) + N( 2 D) pathway. In addition, the measured anisotropic parameters of NO + are close to 0.5, indicating that the C 2 + state of N 2 O + is fully predissociative, indeed, with a tendency of parallel dissociation, and therefore, the corresponding predissociation mechanisms for the N 2 O + (C 2 + ) ions are depicted.
Review of Scientific Instruments, 2009
A novel threshold photoelectron-photoion coincidence ͑TPEPICO͒ imaging spectrometer at the U14-A ... more A novel threshold photoelectron-photoion coincidence ͑TPEPICO͒ imaging spectrometer at the U14-A beamline of the Hefei National Synchrotron Radiation Laboratory is presented. A set of open electron and ion lenses are utilized to map velocity imaging of photoelectrons and photoions simultaneously, in which a repelling electric field using an extra lens is applied to magnify images of photoelectrons instead of traditional accelerating electric field in order to suppress the contribution of energetic electrons in the threshold photoelectron spectroscopy ͑TPES͒ and the mass-selected TPEPICO spectroscopy. The typical energy resolution of TPES is measured to be 9 meV ͑full width at half maximum͒, as shown on the 2 P 1/2 ionization of argon. The measured mass resolving power for the present TPEPICO imaging spectrometer is above 900 of M / ⌬M. Subsequently as a benchmark, oxygen molecule is photoionized by monochromatic synchrotron radiation at 20.298 eV and dissociates to an oxygen atomic ion and a neutral oxygen atom, and the translation energy distribution of oxygen atomic ion is measured by the time-sliced imaging based on mass-selected TPEPICO experiment. The kinetic energy resolution of the present ion velocity imaging is better than 3% of ⌬E / E.
To improve the real-time property for typical Pulse Doppler radar simulation, an idea of signal-l... more To improve the real-time property for typical Pulse Doppler radar simulation, an idea of signal-level simulation using hardware was proposed. The system framework and information flow was studied, then a host method of moving target echo simulation was given. Most of all, radar signal processing was realized by FPGA, which includes digital quadrature detection with IF sampling, pulse compression based