Acm Detection System Design And Implementation,

ACM(Air Cycle Machine)is an important component of airplane air- conditioning system. To guarantee the reliability of ACM, a regular inspection is needed. In order to improve the accuracy of measuring ACM and lower the cost, the inspection instrument of ACM is designed. The inspection instrument specializes in measuring, displaying and recording of analog signals, such as pressure, temperature and displacement, etc. Besides that, the instrument can regulate the braves of the instrument. In this paper, the procedure of designing the instrument and relevant theory are introduced.The theory of A/D/A conversion is the basis of ACM inspection instrument. In this paper, the basic theory and relevant specifications are introduced. After that, IIR digital filtering and LMS FIR filter are described in brief.The A/D circuit board and D/A circuit board of this instrument are designed based on the PCI bus. In this paper, the characteristics of PCI bus, bus order and configuration of register are introduced. In order to design the instrument as simple as possible, we select the chip PCI9050. The chip is produced by PLX Inc. In this paper the usage of this chip is given.The choice of the sensors of the instrument is an important task. The performance of the sensor has a great impact on the accuracy of the system. We spent a lot of time on the choice of them.The hardware is composed of A/D circuit board and D/A circuit board. In this paper, a principle framework is given. The specifications of some important chips are listed. After that, the procedure of programming the driver of the hardware is described. In the sixth chapter of this paper, the methods of detecting and estimation aiming at the signal of vibrating displacement are introduced in depth. The results of simulating are also given.In the end, data processing, error analyzing and the results of debugging are given in brief.