College of Mechanical Engineering;
North China University of Science and Technology;
Tangshan 063210;
P.R.China;
Hebei Province Research Institute of Industrial Robot Industry Technology;
Tangshan 063210;
P.R.China;
Tangshan Industrial Vocational Technical College;
Tangshan 063020;
P.R.China;
six-axis force sensor; optimal design; online static calibration; working condition;