Research On Key Technologies And System For Vibration Data Compression Of Rotary Machines Based On Speech Coding

Rotary machines are key parts of weapon equipment and system such as tanks, and the vibration monitoring is much significant to improve the reliability and safety of weapon equipment and to advance the development of condition-based maintenance technology. The development trend of vibration monitoring for large-scale rotary machines is integrated, high-speed, continuous, networking and etc. The real-time transmission and synchronizing storage of jillion monitoring data have been the bottle-neck of cost and technology to be settled urgently. Vibration data compression is an efficient approach. On the material application background of certain-type armor-vehicle's load-spectrum testing and all-around experimentation of engine, be established in test data compression of the subject foreland and growing point of instrument science and technology, in view of the standardization and deep amalgamation of multi-subject, the dissertation is focused on the key technologies and system implement, in order to apply the standard and ripe speech coding technology to rotary machines'vibration data compression. The contents mainly include:1. The generalized and normalized model of rotary machines'vibration signal has been established according to the requirement of status monitoring and vibration data compression experimentation, which contains various typical vibration status, such as basic frequency, harmonic, pseudo-periodic, under impact, modulated, chaos and so on.2. A relative mature comprehensive evaluation method of rotary machines'vibration data compression and reconstruction has been set up for the sake of weighing the performance, succeed and developed to evaluating methods of speech, image and other data compression. It includes subjective and objective digital value targets, such as vision verify mean opinion score and reconstructed quality in time-domain and frequency-domain, compression efficiency, complexity, time-delay performance and so on. Furthermore, the value principle of multi-target optimization is discussed based on the minimum energy of linear weighed sum of the digital value targets.3. Aimming at the key technologies of speech coding and rotary machines'vibration signal processing, the far-ranging analogy compare and analysis has been accomplished based on various lay of mechanism of signal source happening, typical math model, basic processed unit, principle of information redundancy eliminating, application of engineering practices and etc. The applicability of speech coding technology to rotary machines'vibration data compression has been qualitative analyzed. According to the generalized and normalized model and comprehensive evaluation method, the emulation experimentations of vibration data compression and reconstruction has been done with the four-type representative speech coding arithmetic including ADPCM of wave-shape coding, G.729A of parameter coding, MP3 of apperceive coding and EZW of transform coding. The applicability and validity of speech coding arithmetic is validated by the qualitative and quantitative analysis.4. The integrated performance and optimized consideration of the four-type classical speech coding arithmetic are discussed based on the contrast- experimentation from the aspects of compression efficiency, reconstructed quality, complexity and applicability, etc. In order to improve the compression efficiency, the combining vibration data compression arithmetic has been brought forward based on data dilution and speech coding.5. The integrate vibration testing and real-time compressing systems with high performance-to-price ratio have been independent developed or designed based on the digital testing technologies of multi-DSP parallel procession, embedded PC104 module, MC3 and etc., using for reference of the technology criterion of GPIB, VXI, PXI and LXI system. Which have type-I analogously GPIB, type-II and type-III analogously VXI or PXI, and type-VI of LXI, serving for rotary machines'vibration monitoring of comprehensive, high-speed, continuous and networking trend. The systems have provided experimentation platforms for rotary machines's integrate vibration testing and data compression based on speech coding.6. The experiment system of rotary machines vibration testing and data compression has been designed based on the multi-function platform of axletree-to-rotor. The arithmetics of rotary machines'vibration data put forward in dissertation based on speech coding are studied by experimentation. And the applicability and validity of speech coding arithmetic to rotary machines'vibration data compression are verified much more.