Izvorni znanstveni članak
https://doi.org/10.5552/crojfe.2022.1186
Field Setup and Assessment of a Cloud-Data Based Crane Scale (CCS) Considering Weight- and Local Green Wood Density-Related Volume References
Michael Starke
orcid.org/0000-0002-3651-7664
; Bern University of Applied Sciences School of Agricultural, Forest and Food Sciences HAFL Länggasse 85 3052 Zollikofen SWITZERLAND
Chris Geiger
; Karlsruher Institut für Technologie (KIT) Institute of Mobile Machines (Mobima) Rintheimer Querallee 2 76131 Karlsruhe GERMANY
Sažetak
When investigating the forwarding process within the timber supply chain, insufficient data often inhibits long-term studies or make real-time optimisation of the logistics process difficult. Information sources to compensate for this lack of data either depend on other processing steps or they need additional, costly hardware, such as conventional crane scales. An innovative weight-detection concept using information provided by a commonly available hydraulic pressure sensor may make the introduction of a low-cost weight information system possible. In this system, load weight is estimated by an artificial neural network (ANN) based on machine data such as the hydraulic pressure of the inner boom cylinder and the grapple position.
In our study, this type of crane scale was set up and tested under real working conditions, implemented as a cloud application. The weight scale ANN algorithm was therefore modified for robustness and executed on data collected with a commonly available telematics module. To evaluate the system, also with regard to larger sample sizes, both direct weight-reference measurements and additional volume-reference measurements were made. For the second, locally valid weight-volume conversion factors for mainly Norway spruce (Picea abies, 906 kg m-3, standard error of means (SEM) of 13.6 kg m-3), including mean density change over the observation time (–0.16% per day), were determined and used as supportive weight-to-volume conversion factor.
Although the accuracy of the weight scale was lower than in previous laboratory tests, the system showed acceptable error behaviour for different observation purposes. The twice-observed SEM of 1.5% for the single loading movements (n=95, root-mean-square error (RMSE) of 15.3% for direct weight reference; n=440, RMSE=33.2% for volume reference) enables long-term observations considering the average value, but the high RMSE reveals problems with regard to the single value information...
Ključne riječi
crane scale; forwarder; cloud data; fleet management; timber logistics; artificial neural networks; green density; wood density
Hrčak ID:
268013
URI
Datum izdavanja:
3.1.2022.
Posjeta: 576 *