Cantilever beam weighing sensor is the core component of weight in motion（ WIM） system

but weighing process is influenced by many external factors

and WIM technology itself requires sensor can processing the nonlinear and non-stationary signal

so this thesis is to find an appropriate method of signal processing techniques

Hilbert-Huang transform（ HHT）

HHT is a signal analysis method suitable for nonlinear and non-stationary signal analysis

and suitable for WIM procedure of weighing sensor in signal processing. According to amplitude and frequency of the signal at the endpoint

separately increase two sets of characteristic wave for data extension to suppress boundary effects

then through empirical mode decompose（ EMD） mean of remaining compo-nents as static value in dynamic weighing signal

then calculate axle weight of vehicle.