Stochastic resonant vortex street signal detection device provided with feed-forward controller
A technology of feedforward controller and stochastic resonance, which is applied in the direction of measuring devices, through detecting the dynamic effect of fluid flow, instruments, etc., can solve the problems of signal acquisition duration, signal data length restriction, external noise intensity, and difficulty in verification, etc. To achieve the effect of enhancing the stochastic resonance effect, improving the detection ability, and improving the signal-to-noise ratio
Active Publication Date: 2017-03-15
CHINA JILIANG UNIV
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Since the characteristic signal itself is very weak and the intensity of external noise is relatively large, it will inevitably lead to the signal being buried in the noise, making it difficult to verify; second, the real-time and rapidity of signal detection
In actual engineering applications, the duration of signal acquisition and the data length of signals are often restricted
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[0030] Using this new type of detection flow velocity is 15.85m 3 / h vortex flow, set the A / D sampling frequency of ARM Cortex-M4 as f s =5000Hz, the theoretical characteristic frequency of the detection signal is f 0理论 = 40.40Hz, Figure 4 and Figure 5 They are the time-domain diagram and frequency-domain diagram of the original vortex street signal after the scale transformation module, here the reference voltage added in the scale transformation module has been returned, and it can be found that the signal is submerged in noise and cannot be effectively identified. The existing classical bistable system is loaded on the microcontroller, and the parameters a=1 and b=2 of the classical bistable system are set here. The result obtained after inputting the original signal into the classical bistable system is as follows: Figure 6 shown. Afterwards, the signal obtained by the feedforward control module is processed, and the reference voltage added by the feedforward contr...
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The invention discloses a stochastic resonant vortex street signal detection device provided with a feed-forward controller. The stochastic resonant vortex street signal detection device provided with the feed-forward controller comprises a vortex street flow sensor, a scale transformation module, a feed-forward control module, a micro controller, an output display module and a power supply module, wherein the power supply module respectively provides working voltage for the scale transformation module, the feed-forward control module and the micro controller; and the vortex street flower sensor is connected with the scale transformation module, the scale transformation module is connected with the feed-forward control module, and the scale transformation module, the feed-forward control module and the output display module are respectively connected with the micro controller. The stochastic resonant vortex street signal detection device provided with the feed-forward controller has the advantages that the signal-to-noise ratio of a signal can be effectively improved by the feed-forward control module; and in subsequent stochastic resonance treatment, a vortex street flow characteristic frequency can be more beneficially detected, so that detection of a vortex street signal is more effective.
Description
technical field [0001] The invention relates to a vortex signal detection system, in particular to a stochastic resonance vortex signal detection device with a feedforward controller. [0002] technical background [0003] Stochastic resonance is a synergistic phenomenon in the presence of nonlinear systems, noise, and weak signals. It is generally considered that noise is a harmful interference. Indeed, when detecting useful signals, noise will affect many detection systems, resulting in failure to detect normally. But in the stochastic resonance system, when the noise, signal and nonlinear system reach a certain synergistic condition, the output signal-to-noise ratio is greatly enhanced as the noise intensity gradually increases from small to small. This phenomenon provides a very useful means for stochastic resonance to detect weak signals. Stochastic resonance is a method of detecting weak signals by converting part of the energy of noise into signal energy. [0004] T...
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IPC IPC(8): G01F1/32
CPCG01F1/3287
Inventor 何增黄咏梅林敏褚政泱
Owner CHINA JILIANG UNIV