The invention discloses a pipeline gas leakage recognition device and method. The device comprises a system power supply (7), a DC/DC power module (8), an ultrasonic signal sound gathering hood (6), ahigh-coverage and low-precision annular ultrasonic sensor array (2), a low-coverage and high-precision annular ultrasonic sensor array (3), a solar energy driven trolley (5), a high-pass passive filter module (9), an instrument amplifying module (11), a band-pass active filter module (13), an SOC dual-core processor (12) and an upper computer (10). The pipeline gas leakage recognition device andmethod can more flexibly perform positioned detection on pores and cracks of various gas delivery pipelines; adaptive filtering can be realized for detection of leakage of different pipelines, and thedevice and the method are more intelligent; the working state can be observed on the interface of the upper computer (10), multiple leakage characteristic parameters can be displayed on the interfaceof the upper computer (10) timely once leakage is found, and the detection accuracy is greatly improved.

Pipeline gas leakage recognition device and method

The invention provides a mini active vibration isolating device which comprises a vibration sensor, a piezoelectric actuator, a drive circuit and a feedback control circuit, wherein the vibration sensor senses an external vibration signal to generate a current signal; the current signal is sent to the feedback control circuit; the feedback control circuit generates an inverted drive signal according to the current signal and sends the inverted drive signal to the drive circuit; and the drive circuit drives the piezoelectric actuator to generate vibration which has the same amplitude and an opposite phase of the external vibration signal. The device provided by the invention is designed integrally based on the sensor, a controller and the piezoelectric actuator and can work independently without connection to external control equipment in comparison with an existing piezoelectric vibration isolating devices; vibration measurement data can be output for system error correction, and requirements for precision of high-precision detection equipment can be satisfied; and occupied space is small, and the device can be used for vibration isolation of mini components.

Mini active vibration isolating device

The present invention discloses a vibration line spectrum active control system based on a shared memory. The control system comprises a sensor group, an active controller, an execution mechanism anda host computer. The active controller comprises AD acquisition cards, a sequential logic control card, a digital signal processing card, DA output cards, a back plate and a shared memory card. The ADacquisition cards, the sequential logic control card, the digital signal processing card and the DA output cards read or store data from the shared memory card to avoid direct data interaction amongall module units. The sensor group acquires target signal(s) and reference signal(s), an active vibration controller performs real-time data processing and active control algorithm implementation andoutputs control parameter(s), and finally the purpose of vibration control is attained by outputting the load via actuators. The system can increase hardware configuration flexibility, improve data transmission efficiency and ensure the real-time performance of the system.

Vibration line spectrum active control system based on shared memory

The invention proposes an active vibration isolation system for an actuator test bench based on piezoelectric ceramics, and the system is used for the actuator test bench, and can effectively preventsvarious types of external vibration line spectrums from affecting a measurement result. The system comprises a piezoelectric ceramic actuator, a driver, a feedback sensor, a signal conditioner, and acontroller. The output force of the system is greater than 4000N through employing the piezoelectric ceramic actuator, and the displacement is small, so the system meets the control demands of smalldisplacement of an actuator measurement platform and the 4000N output force of the actuator. The system can be used for eliminating the external interference of more than eight line spectrums (20Hz-200Hz). The line spectrum vibration effect is greater than 15dB, and the precision can meet the requirement of the product quality verification of an electromagnetic actuator of an active vibration isolation device.

Active vibration isolation system for actuator test bench based on piezoelectric ceramics

The invention discloses an active ventilating sound isolation window. The active ventilating sound isolation window comprises an openable sound isolation window body and a noise control device. The intelligent noise control device based on feedforward is arranged on an existing sound isolation window openable part, noise passing through the interior of a sound isolation window opening window framecan be isolated through the intelligent noise control device based on feedforward under the situation that the sound isolation window body is opened, and thus, when the sound isolation window body issubjected to natural ventilation, certain indoor areas can also be subjected to noise reducing treatment at the same time.

Yu Hao

Papers

Active vibration isolation system for actuator test bench based on piezoelectric ceramics

Active ventilating sound isolation window