Piezoelectric Actuator Impact Mitigation for Mobile Body
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Solution Overview
Problem
Existing production machines face challenges in responsively mitigating impact forces when a mobile body collides with a pressure target, leading to potential damage and instability in pressure force control, particularly at increased driving speeds.
Innovation Solution
A production machine equipped with an impact-mitigating actuator, impact-force detecting means, low-frequency-band signal extracting means, driving-force feedback control means, high-frequency-band signal extracting means, and impact-mitigating control means, which work together to detect and mitigate impact forces by controlling the actuator's driving force based on extracted signal components, ensuring stable pressure force control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving speed of the mobile body is increased to enhance productivity, then the output per unit time is improved, but the impact force when the mobile body collides with the pressure target increases causing potential damage
Solution Approach 1:
The impact-mitigating actuator applies a preliminary counteracting force before the mobile body collides with the pressure target. By detecting the approach of the mobile body and pre-applying an opposing force, the system reduces the net impact force at the moment of collision, allowing higher driving speeds without causing damage to the pressure target or mobile body.
Solution Approach 2:
The system uses impact-force detecting means to continuously monitor the impact force during collision. This detection feedback is processed through signal extracting means that separate low-frequency and high-frequency components, which then feed back to control the impact-mitigating actuator in real-time, enabling dynamic adjustment of the counteracting force based on actual collision conditions.
2Object-affected harmful factors
If a shock absorber or damper member is provided to mitigate the impact force, then the impact force is reduced, but the response time increases and resonance may occur limiting the increase in driving speed
Solution Approach 1:
The invention replaces traditional mechanical shock absorbers and dampers with an active control system using an impact-mitigating actuator. This actuator is directly driven by control signals generated from impact force detection, eliminating the need for mechanical energy dissipation elements and achieving instantaneous response without resonance issues.
Solution Approach 2:
The impact-mitigating actuator serves dual functions: it detects the impact force through integrated sensing and simultaneously generates the counteracting force to mitigate the impact. This self-service capability eliminates the need for separate detection and actuation systems, reducing response time and avoiding the resonance problems associated with traditional shock absorption mechanisms.
3Object-affected harmful factors
If traditional impact mitigation methods are used, then the impact force is reduced, but the pressure force control stability deteriorates due to resonance and delayed response
Solution Approach 1:
The control system segments the impact force signal into low-frequency and high-frequency components using signal extracting means. The low-frequency component is used for position control feedback, while the high-frequency component is used specifically for impact mitigation control. This segmentation allows independent optimization of each control objective, maintaining pressure force stability while effectively mitigating impact forces.
Solution Approach 2:
The system dynamically changes the control parameters by selectively processing different frequency bands of the impact force signal. By transforming the single impact force measurement into multiple control signals with different frequency characteristics, the system achieves both impact mitigation and stable pressure force control simultaneously, resolving the contradiction between these two objectives.
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
This solution effectively mitigates impact forces and stabilizes pressure force control, allowing for increased driving speeds without damaging components or pressure targets, while achieving cost and space efficiency through the use of piezoelectric elements for both actuation and detection.
Implementation Method 1
impact-force detecting means which detects the impact force when the mobile body collides with the pressure target
Implementation Method 2
impact-mitigating actuator for use in order to mitigate an impact force when the mobile body collides with the pressure target
Data Source
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AI summary
With a low-frequency-band signal component extracted by a low-frequency-band signal extraction filter 16 from an output signal of a piezoelectric element 15 (an impact-force detection signal) when a tip part 11a of a mobile body 11 collides with a pressure target 14, the magnitude of an impact force exerted on the tip part 11a of the mobile body 11 is extracted, and feedback control is performed by a feedback control unit 17 so that the driving force of an actuator 13 (a pressure force of the mobile body 11 with respect to the pressure target 14) complies with a pressure-force instruction. Furthermore, based on a high-frequency-band signal component extracted by a high-frequency-band signal extraction filter 18 from the output signal of the piezoelectric element 15 (the impact-force detection signal), a drive voltage of the piezoelectric element 15 is controlled by an impact-mitigating control unit 19 so that the impact force when the tip part 11a of the mobile body 11 collides with the pressure target 14 is mitigated.