Periodic signal enhancement detection device and method

A periodic signal and detection device technology, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as the universal detection limitation of actual periodic signals, and the difficulty of automatic and intelligent adjustment of detection circuit system parameters. , to achieve the effect of easy to achieve mass production, easy to understand, and good detection effect

Inactive Publication Date: 2014-03-19
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, the main problem of this type of technology is that the parameter adjustment of the detection circuit system is not easy to realize automation and intelligence, so there are often great restrictions on the universal detection of actual periodic signals
[0005] It can be seen from the above that for the existing periodic signal detection technology based on stochastic resonance, the two technical solutions based on digital signal processing and analog circuit system have certain limitations. How to realize simple and universal technology The scheme still needs to be further explored

Method used

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  • Periodic signal enhancement detection device and method
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  • Periodic signal enhancement detection device and method

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Embodiment 1

[0032] According to the above invention content and appended figure 1 A structural diagram of a periodic signal enhancement detection device, which specifically includes a receiving and preprocessing module 1-1, a power amplifier 1-2, an exciter 1-3, a three-stable cantilever beam physical device 1-4, and a laser displacement sensor 1-5, acceleration sensor 1-6, oscilloscope 1-7. The output interface of the signal receiving and preprocessing module 1-1 is connected to the input interface of the power amplifier 1-2; the output interface of the power amplifier 1-2 is connected to the input interface of the exciter 1-3; the three-stabilized cantilever beam physical device 1 -4 is bolted to the workbench of the shaker 1-3; the laser displacement sensor 1-5 is installed on a suitable bracket to ensure that the laser beam is aimed at the cantilever in the tri-stable cantilever physics setup 1-4 to vibrate freely terminal; the acceleration sensor 1-6 is connected to the three-stable...

Embodiment 2

[0036] According to attached image 3 A flowchart of a periodic signal enhancement detection technology, the specific execution process of the periodic signal enhancement detection method specifically includes the following steps.

[0037] Step 1. For the collected periodic signal containing noise, if there is a phenomenon that the periodic signal to be detected modulates other high-frequency components, it is necessary to demodulate the signal first, and then perform scale conversion according to the range of the period to obtain the preprocessed signal of;

[0038] Step 2, inputting the preprocessed signal into a power amplifier, and inputting the amplified signal into a vibrator to realize the conversion from an electrical signal to a mechanical vibration;

[0039] Step 3, the three-stable cantilever beam physical device installed on the exciter strengthens the periodic component in the mechanical vibration;

[0040] Step 4, collecting and recording the input and output s...

Embodiment 3

[0046] In order to understand the technical solution of the present invention and its effect more clearly, a specific embodiment will be described in detail below. according to figure 1 An experimental platform is built, and the signal used for the test of the embodiment is a rotating machinery fault simulation signal. The signal is composed of periodic unilateral attenuation pulses and additive Gaussian white noise. The frequency of fault pulses is 8.8 Hz.

[0047] First, according to image 3 Step 1: Carry out envelope demodulation on the fault signal by Hilbert transform method. Since the fault frequency of 8.8Hz is within the effective working range of the signal enhancement detection device, X=1 is selected, that is, the signal is played at the original speed.

[0048] Subsequently, according to image 3 Step 2: Input the demodulated fault signal into the power amplifier, and the output signal of the power amplifier drives the electromagnetic exciter to cause the vibra...

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Abstract

The invention provides a periodic signal enhancement detection device and method. The detection device comprises a signal receiving and preprocessing module, a power amplifier, a vibration exciter, a three-steady cantilever beam physical device, a laser displacement sensor, an acceleration sensor and an oscilloscope, wherein an output interface of the signal receiving and preprocessing module is connected with an input interface of the power amplifier; an output interface of the power amplifier is connected with an input interface of the vibration exciter; the three-steady cantilever beam physical device is connected with the working platform of the vibration exciter through bolts; the laser displacement sensor is arranged on a proper stand so as to ensure that a laser beam is aligned with the free vibration end of a cantilever beam in the three-steady cantilever beam physical device; the acceleration sensor is connected onto the three-steady cantilever beam physical device through bolts; output interfaces of the laser displacement sensor and the acceleration sensor are respectively connected onto two different input channels of the oscilloscope. The detection device and method have the advantages of being simple in principle, physical in realization, good in detection effect, strong in universality and the like.

Description

technical field [0001] The invention relates to the technical field of weak signal detection, in particular to a device and method for enhancing detection of periodic signals. Background technique [0002] There are some periodic signals in engineering, such as vibration or sound signals generated by rotating equipment, EEG or ECG signals generated in the human body, ultrasonic detection signals in underwater or structures, etc. These periodic signals carry very useful signal source information, so it is very important to be able to accurately and effectively detect periodic signals. Specifically, the fault detection and diagnosis technology of rotating mechanical equipment can obtain the operating status and health information of the equipment by analyzing the collected vibration or acoustic signals. When rotating equipment fails, it will generate periodic shock vibrations, which are reflected in the collected vibration or acoustic signals. Through the detection of the im...

Claims

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Application Information

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IPC IPC(8): G01H17/00
Inventor 何清波陆思良孔凡让
Owner UNIV OF SCI & TECH OF CHINA
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