Abstract
At the site of cargo package binding in cargo spacecraft, the binding belt tension is loaded with a ratchet device. It is determined by experience of operators, therefore it’s difficult to quantify the force and the reliability of the binding belt is low. Based on the dimension analysis method, a semi-quantitative model was established between the binding belt tension and the ratchet force of the fastening device. The motion of the binding process was carefully observed and analyzed based on Analysis of Therbligs. On this basis, the standard packing process is developed, which improves the repeatability of loading and packing pre loading. A loading test platform for cargo loading is built with small tension sensor and tension tester, and a large number of tension data and ratchet force data are obtained. Based on the least-squares linear data fitting, four coupling models for the four binding belts were established. The coupling model verification experiments show that the calculated values are in good agreement with the measured values, and the errors are mostly lower than 5%. The model can be applied to the quantification of the binding belt tension.
Highlights
FillingsConsidering that the items in the package are hard instruments and equipment, and soft food and clothing, a flexible paper filler with moderate hardness was selected in the experiment
The cargo spacecraft is one of the main development models of the space laboratory mission and the space station project in China
During the steps, loading according to the standard binding process obtained by the front element analysis and applying safety buckle tension according to Table 2 are the key point to improve the accuracy of ratchet force and binding belt tension coupling model
Summary
Considering that the items in the package are hard instruments and equipment, and soft food and clothing, a flexible paper filler with moderate hardness was selected in the experiment. The filling rate was 95%, leaving an appropriate gap in the interior, and the package could be closed
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