Dynamic Weighing Signal Filtering Based On HHT Vibration

With the rapid development of logistics in the field, and now the social development of the flow of goods increasingly demanding, reminders into the role of efficient flow of goods in the economy is very significant. But in recent years the prevalence of freight vehicles under the interests of drivers, loaded cargo beyond the limits prescribed circumstances. Resulting in pressure overload road vehicles is very large, so time is not often you can see a long way to repair damage to the serious situation. Overloading of vehicles on the road is not only very serious harm, but also makes the vehicle greatly shorten the life of the vehicle in the corners and steep where performance is affected, severely affected the traffic safety. For comprehensive management overloaded vehicles on the highway are used our car dynamic weighing system for heavy-duty vehicles were on the road transport of goods were overrun detection, and have achieved good results.WIM refers to the state of motion of the vehicle in order to get through the weighing equipment weight of the vehicle. Compared to static weighing, the higher the efficiency of dynamic weighing more suitable now faster paced logistics and transport testing needs, but still when the vehicle is stationary weighing other static interference on the weighing equipment, in addition to the vehicle itself is not, it is easier to get an accurate weight value. But the dynamic weighing process will face a variety of effects, such as:road conditions; the vehicle loading conditions; weighing equipment useful life too; vehicle status, etc. Under the influence of various factors, resulting in the traditional signal analysis method for weighing process nonlinear, non-stationary signal analysis are not accurate enough, which directly affects the accuracy of dynamic weighing system.By analyzing the working principle of dynamic weighing systems, introduces the various components of the system, including hardware and PC software development architecture. Through the analysis of dynamic weighing process, the weighing process in the state of motion of the vehicle and the overall structure of dynamic vehicle model, analyze their situation by force and motion conditions in the work process, and to get the signal from the sensor and weighing waveforms were compared. The load cell is the core component of the dynamic weighing system, which greatly affects the accuracy of the weighing system, but weighing signal exhibits non-stationary and non-linear nature of the feature, the paper introduces several common signal processing algorithms, By comparison of the signal and such characteristics are not well filtered. And because it is a dynamic weighing system does not stop detection, the sensor signal will also be a lot of outside noise. Through on-site data observed maximum dynamic weighing system encounters interference is due to the car at the time by a dynamic weighing equipment, or because of excessive speed or acceleration in order to make the system drivers of heavy vehicles weighing less than the actual weight take the "jump pump", "Tuobeng" approach, a comprehensive look at the major factor is the vibration generated during vehicle motion signal processing dynamic weighing system produces interference. Axle load signal due to interference and are the same as the low-frequency signal caused by vibration, and therefore, by conventional filtering methods can not effectively remove the noise. In this regard, this paper introduces HHT signal processing methods to eliminate vibration noise. HHT is the first signal of empirical mode decomposition, then each intrinsic mode function components decomposed Hilbert transform, time-frequency analysis method to give a signal when the frequency properties. Analysis of Dynamic weighing signal is more accurate to resolve the nonlinear load cell receives a signal to give a more realistic weight data to calculate a more accurate weight value by using HHT technology.