Results 211 to 220 of about 2,112,118 (259)
Some of the next articles are maybe not open access.
Research on Tri-Frequency Phase Ranging Method
Applied Mechanics and Materials, 2011Based on the principle of microwaves transmission, a novel method of tri-frequency ranging measurement is proposed. When the wavelength of the transmission signal is between 0.47m and 0.57m, the transmitter generates three signals that are co-prime in the wavelength and the interval of the neighboring wavelength is less than or equal to 0.01m.
Qi Ping Yuan +2 more
openaire +1 more source
Research of Time-frequency Analysis Method of Nonstationary Periodic Signal
2008 IEEE Conference on Robotics, Automation and Mechatronics, 2008Nonstationary periodic signal (NPS) is a sort of stochastic signal whose period follow normal distribution, and the statistic average value of period (SAVP) of NPS is very important but difficult to yield. Several time-frequency analysis method including short time power spectrogram (STPS), Wigner-Ville distribution (WVD) and wavelet transform (WT) are
Qiang Zhou, Jiuqiang Han
openaire +1 more source
Research of VLF communication frequency optimizing method
ISAPE2012, 2012The effect of VLF communication is impacted by the environment factors, so the effect lacks the uniformity in the region of time, space and frequency. It makes use of the well prediction of the VLF frequency band, to establish the signal field predicting model and atmospheric noise statistics predicting model respectively, predicts the field of signal ...
Guangming Li, Xiaolei Sun, Guangyou Cai
openaire +1 more source
Research on High Frequency Voltage Injection Method for PMSM
2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA), 2019Based on the idea of salient pole tracking, the paper discusses two methods of high frequency voltage injection which inject rotating voltages and pulsating voltages. It respectively introduces the principle of the rotor position detection in these two methods, and points out the key technologies.
Ziliang Zhang +3 more
openaire +1 more source
Research on Integrity Monitoring Method of Time-Frequency Signal
2018 IEEE 3rd Advanced Information Technology, Electronic and Automation Control Conference (IAEAC), 2018The stability and reliability of high-precision time-frequency signal is an important basis for modern navigation. In this paper, a signal integrity monitoring method has been studied to identify and monitor the performance and the integrity of signal, resolve the problem and provide the high-precision physical signal more stability and reliability ...
Yuwei Li +3 more
openaire +1 more source
Research of Test Method for the Natural Vibration Frequency of Bogie
Advanced Materials Research, 2012In order to determine the，a test bench for the natural vibration characteristics of the bogie suspension was put forward. Firstly the natural vibration characteristics structure composition and the testing principle was introduced, the sine sweep incentive was simulated, and the inverse kinematics solution model and the real-time solution model were ...
Xiu Gang Wang +4 more
openaire +1 more source
A research on carrier frequency offset estimation method for IEEE 802.16m system
2012 International Conference on ICT Convergence (ICTC), 2012In this paper, several methods of carrier frequency offset (CFO) estimation for IEEE 802.16m WirelessMAN-Advanced are suggested and their performances are verified. Fractional part of CFO can be measured using time-domain repetition, and two types of repetition can be utilizable in IEEE 802.16m: the cyclic prefix and PA-preamble.
Jun Woo Kim +3 more
openaire +2 more sources
Journal of Fluid Machinery, 2003
Characteristics of the high frequency pulsatile flow have been investigated experimentally to understand the flow phenomena in the hydraulic system. One axis fatigue test bed, which is widely used for automobile field test, is used. Four pressure transducers, an amplifier and a A/D convertor are used to obtain the high frequency pulsatile pressure ...
Nam-Eun Park +6 more
openaire +1 more source
Characteristics of the high frequency pulsatile flow have been investigated experimentally to understand the flow phenomena in the hydraulic system. One axis fatigue test bed, which is widely used for automobile field test, is used. Four pressure transducers, an amplifier and a A/D convertor are used to obtain the high frequency pulsatile pressure ...
Nam-Eun Park +6 more
openaire +1 more source
Research on Extraction Method of Time-Frequency Feature of Human Motion
2019 Chinese Control And Decision Conference (CCDC), 2019For the problem of motion feature extraction, a method of time-frequency analysis and eigenvalue extraction by fractional Fourier transform is proposed. Collect inertial data in the process of motion by wearing 15 IMU. Analyze and compare its characteristics after the multiorder fractional Fourier transform.
Wang Tianrun +3 more
openaire +1 more source
Research on Dual Frequency Excited Cutting Method of Metal Bar
2020 39th Chinese Control Conference (CCC), 2020The efficiency and quality problems in the cutting method of metal bar under dual-frequency excitation were studied. Through establishing the crack growth time model of bar with V-groove, the influencing factors of cutting efficiency were analyzed.The polynomial of related variables was extracted to draw function images to analyse the influencing rules
Airong Zhang, Chunjian Hua, Haojing Ren
openaire +1 more source