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您的检索式：作者名="Runlan Wang"
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| 1 | Thoughts on practice teaching in Educational Technology 显示文摘 | Runlan Wang Yuesheng Wang Jinhui Huang | 2007 | E-education Research2007，，05： | 1 |
| 2 | Blind carrier frequency estimation for phase shift keying signals in low signal to noise ratio显示文摘In order to solve the problem of carrier frequency blind estimation of PSK signals in electronic reconnaissance, a new estimation method was proposed. The phase shift keying(PSK) signal was divided into several overlapping intervals which had equal length, and the spectrum concentration measures of every interval were extracted by the FFT. And then, using the grid-density clustering, the spectrum concentration measures were classified into two categories, the narrowband spectrum interval and the wideband spectrum interval. The narrowband spectrum interval was regarded as the characteristic class. The spectrums of the characteristic class were accumulated to estimate the carrier frequency of PSK signal. The proposed method had avoided the non linear operation in the traditional PSK signal carrier frequency estimation algorithm. Thus, the signal to noise ratio (SNR) threshold was remarkably decreased. Moreover, the proposed method did not need the prior knowledge of the signal, which was suitable to the electronic reconnaissance occasion. Experimental results had verified the validity of the proposed estimation method in low SNR. | Wang Xiaofeng Zhang Guoyi Tian Runlan Li Dawei | 2015 | 强激光与粒子束2015，27，10： | 1 |
| 3 | A Study of Effect of Various Normal Force Loading Forms on Frictional Stick-Slip Vibration显示文摘In this work,a comparative study is performed to investigate the influence of time-varying normal forces on the friction properties and friction-induced stick-slip vibration(FIV)by experimental and theoretical methods.In the experiments,constant and harmonic-varying normal forces are applied,respectively.The measured vibration signals under two loading forms are compared in both time and frequency domains.In addition,mathematical tools such as phase space reconstruction and Fourier spectra are used to reveal the science behind the complicated dynamic behavior.It can be found that the friction system shows steady stick-slip vibration,and the main frequency does not vary with the magnitude of the constant normal force,but the size of limit cycle increases with the magnitude of the constant normal force.In contrast,the friction system under the harmonic normal force shows complicated behavior,for example,higher-frequency larger-amplitude vibration occurs and looks chaotic as the frequency of the normal force increases.The interesting findings offer a new way for controlling FIV in engineering applications. | Xiaocui Wang Runlan Wang Bo Huang Jiliang Mo Huajiang Ouyang | 2022 | Journal of Dynamics, Monitoring and Diagnostics2022，1，1： | 0 |
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