The State Key Laboratory of Fluid Power and Mechatronic Systems;
College of Mechanical Engineering;
Zhejiang University;
Hangzhou 310027;
China;
Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province;
College of Mechanical Engineering;
Zhejiang University;
Hangzhou 310027;
China;
College of Mechanical Engineering;
Zhejiang University of Technology;
Hangzhou 310023;
China;
Pharmaceutical Informatics Institute;
College of Pharmaceutical Sciences;
Zhejiang University;
Hangzhou 310058;
China;
Conical fluidized bed; Negative pressure; Pressure fluctuation; Time-series analysis; Characteristic value; Fluidized state;