Kinetics analysis and method of dynamic weighing about wheel loader

Based on an existing dynamic weighing kinetics model about wheel loader, an analytical formula about the relationship between the lift crane's angular acceleration and its piston elongation was driven. And then the rule was deduced, that the angular acceleration of lift crane only has some influences on dynamic weighing at the beginning and the foot of the piston's elongation, while in the other segment, its influence can be neglected. Also the rule is found, that with different velocities of the lift crane, the curve for the variation of pressure in the cylinder against length of the piston goes in parallel. So dynamic weighing can be done in the middle part of the elongation, and it can be carried out as the following steps, firstly a dynamic calibration using two standard masses was done in advance; secondly a dynamic pressure compensation course varying with different lift crane velocity was implemented; finally after some simple linear proportional calculation operations using local pressure measured and the data obtained from dynamic calibration, the dynamic weighing was fulfilled. In the end, using the instrument developed according to above mentioned theory, the measurement precision within 1% can be obtained, which indicates the validity of the theory herein.