A kind of method measuring the Eucalyptus cloeziana mechanical property of wood

A kind of method measuring the Eucalyptus cloeziana mechanical property of wood

  • CN 106,248,613 A
  • Filed: 08/19/2016
  • Published: 12/21/2016
  • Est. Priority Date: 08/19/2016
  • Status: Active Application
First Claim
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1. the method measuring the Eucalyptus cloeziana mechanical property of wood, it is characterised in that comprise the following steps:

  • (1) sawdust sample collection;

    select the Eucalyptus cloeziana live standing tree of N/D to be numbered, and be divided into part A, part B, andRemove the timber sawdust sample after skin at high 1.3 meters of trunk, sawdust sample is taken back experiment room-dry;

    (2) near infrared spectra collection of sawdust sample;

    the sawdust sample of step (1) is ground into wood powder through Sample Grinder, 24Utilize the MPA Fourier transform spectrometer scanning of Bruker company of Germany in DEG C thermostatic chamber and gather near infrared spectrum, spectrum rippleSegment limit is 4000~

    12000cm-1, resolution be 8cm-1

    (3) standard value of the mechanical property of wood measures;

    cuted down gathering wood flour sample trees in step (1), respectively with reference to country'"'"'s markAccurate " Method for determination of the modulus of elasticity in static bending of wood " (GB1936.2-2009), " Method of testing in bending strength of wood " (GB 1936.1-2009), " Method of testing in compressive strength parallel to grain of wood " (GB 1935-2009) corresponding mensuration wood modulus of elasticity, timber resistCurved intensity, the standard value of timber parallel-to-grain compressive strength;

    (4) Pretreated spectra and the foundation of model and optimization;

    Corresponding timber measured in a, the near infrared spectrum recorded in step (2) by part A sample and step (3) resistsThe standard value of curved elastic modelling quantity is input in spectral analysis software OPUS 7.0, carries out original near infrared spectrum pretreatment, simultaneouslyUtilize partial least square method (PLS) and cross validation method set up near infrared spectrum and wood modulus of elasticity standard value itBetween intersection calibration model, the abnormity point in troubleshooting model, make coefficient of determination R2>

    =0.75 and Residue prediction deviation RPD >

    =2.0,Obtain several wood modulus of elasticity preliminary election models;

    Corresponding timber measured in b, the near infrared spectrum recorded in step (2) by part A sample and step (3) resistsThe standard value of curved intensity is input in spectral analysis software OPUS7.0, carries out original near infrared spectrum pretreatment, utilizes partially simultaneouslyMethod of least square (PLS) and cross validation method set up the school that intersects between near infrared spectrum and the standard value of the bending strength of woodPositive model, the abnormity point in troubleshooting model, make coefficient of determination R2>

    =0.75 and Residue prediction deviation RPD >

    =2.0, it is thus achieved that severalBending strength of wood preliminary election model;

    In c, the near infrared spectrum recorded in step (2) by part A sample and step (3), measured corresponding timber is suitableThe standard value of stricture of vagina comprcssive strength is input in spectral analysis software OPUS 7.0, carries out original near infrared spectrum pretreatment, simultaneouslyUtilize partial least square method (PLS) and cross validation method set up near infrared spectrum and timber parallel-to-grain compressive strength standard value itBetween intersection calibration model, the abnormity point in troubleshooting model, make coefficient of determination R2>

    =0.75 and Residue prediction deviation RPD >

    =2.0,Obtain several timber parallel-to-grain compressive strength preliminary election models;

    (5) model external inspection and selection;

    utilize part B sample data that preliminary election model is carried out external inspection, by step (2) andIn the near infrared spectrum of the part B sample surveyed in step (3) and standard value input POUS7.0, and whole timber is selected to resistCurved elastic modelling quantity preliminary election model or all bending strength of wood preliminary election model or all timber parallel-to-grain compressive strength preliminary election model are logicalCross and use the spectral model mass analysis method in Spectrum software OPUS 7.0 part B sample spectra to be predicted, according in advanceThe principle that the correlation factor of measured value and standard value is maximum and/or predictive value root-mean-square error (RMSEP) is minimum selects a model,The intersection calibration model being near infrared spectrum is also set to corresponding quickly rating model;

    (6) model application;

    select sample trees to be measured, implements step (1), step (2), the near infrared spectrum input spectrum that will be obtainedSoftware OPUS 7.0, the quick rating model that applying step (5) is obtained can measure the sample trees basic mechanical property of corresponding timberMatter.

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