The widely investigated signals are mainly nonstationary and nonlinear signals, thus it is difficult to get the precise information from the nonstationary and nonlinear signals. Here we introduce a new method to process the nonstationary and nonlinear signals. And this new algorithm makes a good performance on processing the nonstationary and nonlinear signals. This paper mainly describe the basic theory of the new algorithm——Hilbert-Huang Transform. The Hilbert-Huang Transform is composed of Empirical Mode Decomposition and Hilbert transform. The problems of this arithmetic are summarized, such as the end effects, stop criterion and so on, and the solutions of these problems are put forward. This paper also provides some improved methods based on the Empirical Mode Decomposition in the end, such as Adaptive Time Varying Filter Decomposition, Extremum filed Mean Mode Decomposition and Improved Extremum field Mean Mode Decomposition.
This paper introduces a new kind of electronic product — Package Security Recorder of
Vibration. It utilizes STC89C54RD+ LQFP-44 MCU as its main controller. At the same time, it also utilizes
Freescale MMA845A 3-Axis 8-bit/12-bit Digital Accelerometer and Maxim DS1302 Trickle Charge
Timekeeping Chip. It utilizes the MCU to read the value of the accelerometer and the value of the
timekeeping chip, and records the data into the inner E2PROM of MCU. The whole device achieves
measuring, reading and recording the time of the vibration and the intensity of the vibration. When we need
the data, we can read them out. The data can be used in analyzing the condition of the cargo when it
transported. The device can be applied to monitor the security of package. It solves the problem of
responsibility affirming, when the valuable cargo are damaged while it transported. It offers powerful
safeguard for the package. It’s very value for application.
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