Macro-Micro Compound Platform for High-Speed Precision Motion
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Solution Overview
Problem
Existing motion platforms face challenges in achieving high precision over long strokes due to limitations in combining macro and micro motion capabilities, leading to increased manufacturing costs and uncontrollable vibration amplitudes at resonance frequencies.
Innovation Solution
A macro-micro integrated compound platform with adjustable dynamic characteristics, featuring a variable damper and a stiffness-frequency adjustment mechanism, allows for high-speed precision motion by isolating vibrations at any frequency and enabling high-precision displacement compensation through compound motion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long-stroke high-precision motion platform is employed, then the stroke length is improved, but the manufacturing cost increases significantly
Solution Approach 1:
The motion platform is divided into two independent modules: a macro motion platform for long-stroke general-precision motion and a micro motion platform for short-stroke high-precision motion. The micro motion platform is mounted on the macro motion platform, allowing the system to achieve long stroke with high precision without requiring a single expensive long-stroke high-precision platform.
Solution Approach 2:
The macro motion platform and micro motion platform are combined into an integrated compound platform. The macro motion platform provides the long stroke capability while the micro motion platform provides the high precision positioning, merging their functions to achieve long-stroke high-precision motion at lower cost.
2Object-affected harmful factors
If not enough damping is applied to control resonance, then the structure remains simple, but the vibration amplitude becomes uncontrollable at resonance frequencies
Solution Approach 1:
A variable damper is introduced instead of fixed damping. The damping coefficient can be adjusted dynamically to match different working frequencies and load conditions. This allows the system to effectively control vibration amplitude at resonance frequencies while maintaining adaptability to different operating conditions.
Solution Approach 2:
The damping parameter is made variable through the variable damper mechanism. By changing the damping coefficient according to the working frequency and load conditions, the system can optimally suppress resonance vibrations without requiring an overly complex fixed damping structure.
3Adaptability or versatility
If the working frequency must avoid resonance points, then the vibration amplitude is controlled, but the range of working frequency is limited
Solution Approach 1:
The variable damper allows the damping coefficient to be dynamically adjusted based on the operating frequency. When approaching resonance frequencies, the damping can be increased to control vibration amplitude, enabling the system to operate across a wider frequency range including resonance points that would otherwise be avoided.
4Manufacturing precision
If a micro motion platform is added to the macro motion platform, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
The micro motion platform is nested on top of the macro motion platform, with the micro platform mounted within the macro platform's workspace. This nested arrangement allows the two platforms to share common support structures and control systems, reducing the overall complexity compared to separate independent systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The platform achieves high-speed, precise motion over a wide range while controlling vibration amplitudes, increasing the working frequency range and ensuring precise positioning without avoiding resonance points, thus enhancing manufacturing efficiency and reducing costs.
Implementation Method 1
a variable damper for resisting resonance
Implementation Method 2
isolate the vibration at any frequency
Implementation Method 3
elastic piece groups for limiting displacement
Data Source
AI summary
The present invention proposes a macro-micro integrated compound platform with adjustable dynamic characteristics. When a macro platform mover and a micro platform mover are driven at the same time, the whole large-scale high-speed motion can be realized; when a motion deviation occurs, a micro motion platform can be driven separately to realize the high-frequency motion deviation compensation, because the micro motion platform has small inertia and zero friction and achieves precision displacement output through elastic deformation. The macro-micro integrated compound platform can realize high-speed precision motion through compound motion control, is mounted and used in a manner consistent with the traditional platform, and is convenient to be popularized and applied; a stiffness and frequency adjustment mechanism and a variable damper are arranged, so that the micro motion platform can transfer the motion of a macro motion platform and isolate the vibration at any frequency, and realize high-precision displacement compensation; meanwhile, damping of the variable damper is matched with the stiffness and frequency parameters to ensure the high-precision displacement compensation at any frequency and increase the range of working frequency.