Design and Testing of a Compliant ZTTΘ Positional Adjustment System with Hybrid Amplification

Area of Science:

• Mechanical Engineering
• Precision Engineering
• Robotics

Background:

• Achieving high-precision spatial pose adjustment is critical for advanced manufacturing and manipulation.
• Existing systems often face challenges with coupling, stiffness, and stroke range.

Purpose of the Study:

• To design, analyze, and prototype a four-degrees-of-freedom (4-DoFs) spatial pose adjustment system (SPAS).
• To achieve high-precision positioning in Z/Tip/Tilt/Θ (ZTTΘ) directions with low coupling and high stiffness.

Main Methods:

• Integration of piezoelectric-driven amplification with bridge lever hybrid, double four-bar guide, and multi-level lever symmetric rotation mechanisms.
• Analytical modeling and finite element analysis for geometric parameter optimization.
• Prototype fabrication and performance testing, including closed-loop decoupling control experiments for MIMO systems.

Main Results:

• The system achieved a Z-direction microstroke of 327.37 μm and yaw/rotation angles of 3.462 mrad and 12.684 mrad, respectively.
• Motion magnification ratio reached 7.43 for X and Y axes.
• Demonstrated high positioning accuracies: ±100 nm (Z-direction), ±2 μrad (X/Y yaw), and ±25 μrad (Z-rotation).

Conclusions:

• The ZTTΘ mechanism design is feasible and offers significant advantages for precision applications.
• The developed SPAS shows great potential for precision machining and micro-nano manipulation tasks.