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The value of sound pressure level(SPL) result from the
continuousflowing rece grain varies with the moisture content
and the flow droppingheight. The relationship between the
moisture content of rice, the flow dropping height and the
equivalent continuous sound pressure level (Leq) isestablished
by regression analysis technique in this research. The
regression equation then was served as the foundation the
measurement for the on-linereal-time continuous acoustic rice
grain moisture meter. The dry weight of therice grain was
measured under the condition of 105 C,72 hours by the air oven.
The result of the experiment indicated that Leq values have
thesignificant relation with the flow dropping height and
moisture content. By theregression of Leq on the dropping height
and moisture content was established to obtain two predict
models.1.Model A:Indirect model Leq values were serredas
dependent variables, moisture content and dropping height values
were serredas in dependent variables to established
theregression model. The predict equation of M. C. then be
transformed bythe algebra formula from the regression model.2.
Model B:Direct model M. C. values were adopted as dependent
variables, Leq and droping height values were served as
independent variables. The prediction equationof M. C. then be
established directly by regression technique. The values of
the rice grain flow dropping height is ranged from 250mmto
550mm, and the rice grain moisture content is ranged from
12.6368(%) to25.3157(%). The validation data independent with
the data set for modelestablished were used to compare the
predictive performance of two models.The average absolute
errors(Dave) of Model A was lower than those of Model B.The
average relative error percentage values(Per) of Model A was
more close to unity than those of Model B. The predictive
performance of Model A was superior to Model B. By the
continuous acoustic rice grain moisture meter which hasdeveloped
in this reason. The variety of Taikeng No.1 rice grain.
Therelationship of between the equivalent continuous sound
presure level andmoisture content and dropping height was
established the predict models ofmoisture content. They both
have the good predictive performance. Themeasurement of the Leq
for rice grain could be applied on the on-line real-time, in-
situ measurement of the rice grain moisture meter.Keyword:rice
grain, acoustic, moisture content, moisture meter.
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