Nominal stiffness of GT-2 rubber-fiberglass timing belts for dynamic system modeling and design

Bozun Wang, Yefei Si, Charul Chadha, James T. Allison, Albert E. Patterson

Research output: Contribution to journalArticlepeer-review


GT-style rubber-fiberglass (RF) timing belts are designed to effectively transfer rotational motion from pulleys to linear motion in robots, small machines, and other important mechatronic systems. One of the characteristics of belts under this type of loading condition is that the length between load and pulleys changes during operation, thereby changing their effective stiffness. It has been shown that the effective stiffness of such a belt is a function of a "nominal stiffness" and the real-time belt section lengths. However, this nominal stiffness is not necessarily constant; it is common to assume linear proportional stiffness, but this often results in system modeling error. This technical note describes a brief study where the nominal stiffness of two lengths (400 mm and 760 mm) of GT-2 RF timing belt was tested up to breaking point; regression analysis was performed on the results to best model the observed stiffness. The experiments were performed three times, providing a total of six stiffness curves. It was found that cubic regression mod els (R2 > 0.999) were the best fit, but that quadratic and linear models still provided acceptable representations of the whole dataset with R2 values above 0.940.

Original languageEnglish (US)
Article number75
Issue number4
StatePublished - Nov 21 2018


  • 3D printers
  • Belt stiffness
  • Dynamic system modeling
  • Mechatronic systems
  • Robotics
  • Timing belt

ASJC Scopus subject areas

  • Mechanical Engineering
  • Control and Optimization
  • Artificial Intelligence


Dive into the research topics of 'Nominal stiffness of GT-2 rubber-fiberglass timing belts for dynamic system modeling and design'. Together they form a unique fingerprint.

Cite this