Study On Strength Test System Based On Time Domain Analysis And Frequency Domain Arialysis For Laminated Veneer Lumber

In this paper, combined with the actual situation of the present research and development status, wood product comprehensive domestic outer layer, this paper puts forward a set of detection of laminated veneer lumber quality nondestructive detection scheme for the purpose of. Comprehensive utilization of ultrasonic echo detection technology, computer technology and spectrum analysis technology laminated wood quality on-line detection. This principle from the overall design to testing used in the analysis, and then to the constitution of the hardware and software are described in detail, built a laminated wood quality testing platform. The system uses data acquisition card PCI-1710HG acquisition widely on the signal, the R&D technology IPC-610-H industrial control computer as the core of data processing and analysis of PC. comprehensive and processing through the numerical parameters of the detected, obtained dynamic modulus of elasticity sheet:using vibration hammer percussion LVL vibration signal, windowing and FFT transformation to obtain the spectrum of the vibration signal, and extract the inherent frequency. Analysis of correlation analysis of static bending strength and elastic modulus of the known; according to the echo time, judge the internal sheet no holes; through the analysis to the natural frequencies, affect the holes on the steel qualityAnalysis of technology provides a feasible scheme for wood detection by spectrum analysis technology and ultrasonic echo, which has a certain guiding significance for the wood industry.