Vibration signal charge amplifier fault detection method

Abstract

The invention belongs to the technical field of aviation mechanical shock vibration monitoring, and particularly relates to a vibration signal charge amplifier fault detection method. A conditioning method used by the fault detection method comprises the following steps of: using a high-resistance output bus driving circuit to ensure that the fault detection circuit does not influence the acquisition precision of the charge amplifier; using a passive voltage-to-charge circuit to realize conversion from a voltage signal to a charge signal in the fault detection circuit; using a digital square wave voltage signal, and simulating an alternating current charge signal through the passive voltage-to-charge conversion circuit. The method is simple in design, easy to implement and high in anti-jamming capability, the fault of the vibration signal charge amplifier can be effectively detected, and the vibration signal acquisition precision is not affected.

Description

technical field [0001] The invention belongs to the technical field of aviation machinery impact vibration monitoring, and in particular relates to a fault detection method for a vibration signal charge amplifier. Background technique [0002] At present, the monitoring and control technology of aviation and aerospace engines will involve a large number of vibration signals, which are generally measured by piezoelectric acceleration sensors in the field of aviation and aerospace. The output of the piezoelectric acceleration sensor needs to be transformed by the charge amplifier (that is, the charge-voltage conversion) before it can be used for subsequent amplification, integration and filtering. [0003] However, the output charge of the piezoelectric acceleration sensor is weak, which makes the performance of the charge amplifier susceptible to interference, which brings inconvenience to the measurement, and it is difficult to increase the fault detection function. In orde...

AI Technical Summary

Problems solved by technology

[0004] None of the existing charge signal amplifiers includes a fault detection circuit. Most of the vibration signal conditioning fault detection methods described in the prior art judge whether the vibration signal conditioning is faulty based on the rotational speed of the rotating part and the physical relationship of vibration. For example: when the speed signal Starting from scratch, and during the increase process, the total vibration signal should increase and be greater than a specific threshold of total vibration. This indirect detection method has many problems, such as vibration signal cable disconnection and vibration signal conditioning Various problems such as circuit failure cannot be distinguished

Images