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Transient VS Quasi-Static: Understand the Different Contact Types in Risk Assessment

Mathieu Bélanger-Barrette
by Mathieu Bélanger-Barrette on Aug 16, 2016 7:00:00 AM

Since collaborative robot safety is a huge concern for our end-users, we thought it was important to release some content on this subject. You may already have taken a look at our different eBooks about safety for collaborative robots. This time, we thought that explaining safety concepts with short  videos would help you figure out a couple of additional details. 

This first video is about the difference between two types of impacts listed in the ISO/TS 15066. In fact, quasi-static and transient impacts can both occur when working alongside a robot co-worker. 


A quasi-static impact occurs when the robot crushes a human's body part against a fixed object. In this video, we illustrate this example by demonstrating the robot crushing the hand of the worker against a table. 


This type of impact occurs when the robot enters in contact with a human's body part without any restrictions. In other words, the body part can move freely under the robot's force. 


Why Do I Need to Know that? 

Well, as you probably figured, a quasi-static impact can be a lot more harmful than a transient impact. Since the ISO/TS 15066 standard has differentiated these two types of impacts, they also defined different pain thresholds for each type. The general rule is a transient impact can apply a force two times higher than a quasi-static impact. For example, if a robot crushes your hand against a table, a maximal force of 135N should be reached before reaching the human pain threshold. In the other case, in a transient impact, a force of 270N can be reached before getting into the pain threshold. 

We also posted a couple of other videos that can help you understand some other safety concepts. Stay tuned for more content on collaborative robot safety. 

Other Videos

Pressure Calculation

Risk Assessment Process




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Mathieu Bélanger-Barrette
Mathieu works as the production engineer at Robotiq, where he strives to constantly optimize the production line for Robotiq Grippers. Mathieu is always looking for new manufacturing processes to make operators as efficient as possible. He is also seeking out new robotic applications and their effect on improving our world, then keeps Robotiq’s blog readers updated on his finds.
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