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The Utilization and Development of Virtual Instrument for the Nondestructive Test of Wood Materials

Author: ZhangHaiFeng
Tutor: WangFengHu
School: Northeast Forestry University
Course: Wood Science and Technology
Keywords: Virtual Instrument Wood materials Non-destructive testing Dynamic modulus of elasticity
CLC: S781
Type: Master's thesis
Year: 2008
Downloads: 53
Quote: 0
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Abstract


To measure the physical and mechanical properties of wood materials in the use of means of non-destructive testing , the instrument is indispensable. Close combination of computer and instrument instrument development is an important direction , and will meet wood materials vibration signal acquisition , real-time processing and storage and many other needs . The main content of this paper is LabVIEW software combined with the computer , the development of real-time collection and analysis of vibration signals software system , virtual instrument dedicated to non-destructive testing of wood materials . The main hardware of the system applications Advantech's PCI - 1712 acquisition card and Engineering control machine . First , establish the link between the hardware and software platforms , and the development of real - time data acquisition program . Mainly based on LABVIEW the data acquisition toolbox programming rules programming, while taking advantage of the first-in-first-out buffer feature of the PCI - 1712 acquisition card . A certain time interval the data is removed from the buffer ( need to ensure that deleted data has been saved) and then collect new data to ensure real-time data . Second, to achieve real-time processing of the vibration signal , finally, using the LabVIEW graphical user interface , developed a friendly , powerful system user interface . Virtual instrument on the vibration of the timber , a non-destructive detection signal analysis processing , the relationship between the vibration characteristics of the timber and its mechanical properties and defects , for their dynamic modulus of elasticity and defects in the presence or absence of the position of the defect and defect the extent of the comprehensive study . In the mechanical properties of laminated veneer lumber vibration method for non-destructive testing research investigated the impact of different boundary conditions on the dynamic modulus of elasticity . The results of this study are summarized as follows: Virtual Instrument wood composites measured dynamic elastic modulus and the static elastic modulus having a close correlation , the timber of the conventional static elastic modulus can be measured with the Virtual Instrument through the linear regression equation of the dynamic elastic modulus amount to characterize . Virtual instrument has obvious advantages in non-destructive detection of defects in wood , virtual instrument has broad application prospects in the theory and practice to meet the wood materials vibration signal acquisition , real-time processing and storage and many other needs .

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CLC: > Agricultural Sciences > Forestry > Forest harvesting and utilization > Wood Science
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