Vibration Controller Using Negative Resistance Circuit
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Solution Overview
Problem
Conventional vibration controllers with parasitic resistors in resonant circuits fail to sufficiently dampen vibrations due to reduced Quality Factor (Q) of resonance, limiting their effectiveness in controlling vibration energy.
Innovation Solution
A vibration controller is designed with a piezoelectric element, a quasi-inductor circuit, and a negative resistance circuit connected in series, which offsets the parasitic resistor, enhancing the Q of resonance and effectively damping vibrations by adjusting the resistance to control vibration energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a parasitic resistor is present in the resonant circuit, then the circuit can be constructed with conventional components, but the Quality Factor (Q) of resonance is reduced, preventing sufficient damping of vibration
Solution Approach 1:
The patent converts the harmful effect of the parasitic resistor (which reduces Q and prevents sufficient damping) into a beneficial effect by introducing a negative resistance circuit. This negative resistance circuit actively compensates for and cancels the parasitic resistance, transforming the unavoidable energy loss into an opportunity to achieve precise Q control and effective vibration damping.
Solution Approach 2:
The patent changes the resistance parameter of the resonant circuit by introducing a controllable negative resistance element. By adjusting the negative resistance value to match and oppose the parasitic resistance, the system can dynamically control the overall resistance and optimize the Q factor for different damping requirements, moving from a fixed passive circuit to an actively controllable system.
2Reliability
If a negative resistance circuit is added to offset the parasitic resistor, then the Q of resonance is increased and vibration damping is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the need for complex mechanical vibration damping structures with an electrical negative resistance circuit. Instead of using mechanical dampers or friction-based systems, the invention uses electrical components (operational amplifiers, resistors, capacitors) to create a negative resistance effect that electronically compensates for parasitic losses, achieving vibration control through electrical means rather than mechanical complexity.
Solution Approach 2:
The negative resistance circuit serves multiple functions: it compensates for parasitic resistance, controls the Q factor, enables adjustable damping levels, and can even provide excitation when configured appropriately. This single circuit module replaces what would otherwise require multiple separate components or systems, reducing overall complexity while providing versatile vibration control capabilities.
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 solution effectively increases the Q of resonance, allowing for better damping of vibrations in controlled objects, enabling varied vibration control modes, including damping, undamped, and excitation, depending on the resistance settings.
Implementation Method 1
an inductor and a negative resistance circuit connected in series to a piezoelectric element
Implementation Method 2
The resonant circuit resonates at a natural frequency of the object of control
Data Source
AI summary
A vibration controller includes: a piezoelectric element fixed to an object of control; and a quasi-inductor circuit and a negative resistance circuit connected in series to the piezoelectric element.