1) point mass
2) variable mass-point
A theorem on kinetic energy for variable mass-point and formula of work of recoil internal forces are given and the reason of soft-rope query is discussed.
3) spot welding quality
For the requirement of spot welding quality in automobile industry,a fuzzy evaluation system for spot welding quality was developed and the software was designed.
4) quality ideas
5) Solder Joint Quality
Inspection Method on Solder Joint Quality in SMT;
Study on ANN-based Expert-system Applied to SMT Solder Joint Quality Control;
According to the characteristics that SMT solder joint quality is related to its 3-D geometrical shape directly, theory of solder joint shape was put forward.
6) joint quality
Influences of laser parameters on soldered joint quality,and the application and development of diode-laser soldering were also discussed briefly.