Related Experiment Video
Updated: Jan 12, 2026

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
Published on: September 28, 2015
Optimising the Accuracy of Concentric Tube Robots: Using Vibration Friction Reduction
Yao Wang1, Fuxin Du2,3, Gang Zhang2
1Control Science Engineering Department, Shandong University, Jinan, China.
Background:
The concentric tube robots (CTRs) show great potential for minimally invasive surgery due to their size and flexibility. However, friction remains a key factor contributing to accuracy errors in CTR applications, and reducing friction effects to enhance CTRs' precision remains a critical challenge.
Methods:
This paper pioneers the application of a vibration friction reduction (VFR) method for CTRs, aiming to reduce inter-tube friction and improve system accuracy. First, a CTR system with VFR was designed, incorporating a vibration generator consisting of four vibration motors and a 3D-printed component. Then, to better test and analyse the effects of vibration on friction, a variable-friction coefficient kinematic model for CTRs was established. Finally, experiments were conducted to validate the approach.
Results:
The results show that the VFR method can reduce the positional error of CTRs by approximately 36.5%.
Conclusion:
This paper provides a new approach to enhance CTRs' accuracy in surgical applications.
Related Concept Videos
Stress Concentrations in Circular Shafts
Mechanical Efficiency of Real Machines
However, in reality, no machine can be truly ideal, and all of them experience some...
Static and Kinetic Frictional Force
However, if two systems are in contact and are stationary relative to one...
Frictional Forces on Screws
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Design Example: Deciding Thickness of Lubricating Fluid in a Shaft
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
Deformation in a Circular Shaft

