| The paper introduced the method of Density Meter on Road Bed and its defaults, based on the practical situation of China and demonstrated the essential functions of our proper-right general situation and development of Density-Meter system. Investigated hundreds of scientific research papers, the principles of Density-Meter are expounded in theory and practice, and the acceleration signals of vibrating front wheel are analyzed in order to achieve exact density value. Based on the theory of signal analysis, the style of noise, the sampling frequency, the style of wave filter, style of window function, arithmetic of frequency transform and FFT transform are all ascertained, and then the system of Density-Meter is produced with the company in China. In the last, plenty of local experiments are carried out, and some analysisabout the effects is made in different methods—breadth radio and harmony wave radio, validated that the method of breadth radio is a reliable method and effect is perfect, angle and situation of acceleration sensor are achieved at the same time. To the end, through the abundant comparative experiment, a formula of Density-Meter which can exactly calculate the density of compacted soil is offered, and result is below 5 percent. It is important to produce Density-Meter. |
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