Single-Mass Resonant Driver With Split Springs for Pure Frequency Tuning
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Solution Overview
Problem
Current vibratory systems, such as vibratory pile drivers, are inefficient due to the significant energy wasted in accelerating and decelerating the dynamic mass and implement, with existing resonant mechanisms not effectively minimizing the contamination of the pure real natural frequency of the combined mass and one-dimensional implement system.
Innovation Solution
A single-mass, two-spring resonant system is introduced, featuring a linear vibrator with a backing mass, separate internal and external biasing springs, and a connection device, which separates the biasing spring functions to reduce the total volume of pressure cavities and minimize the impact of fluid medium compression, allowing for more efficient energy transfer and reduced contamination of the natural frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single biasing spring is used to provide both external force biasing and internal positioning, then the device complexity is reduced, but the total volume of pressure cavities increases and fluid medium compression impact increases
Solution Approach 1:
The patent divides the single biasing spring function into two separate components: an external biasing spring (34) that provides external force biasing, and an internal positioning biasing spring (16) that provides internal positioning. This segmentation allows each spring to be optimized for its specific function, reducing the total volume of pressure cavities while maintaining all necessary biasing and positioning functions.
2Loss of energy
If the volume of pressure cavities is reduced, then fluid compression impact is minimized and energy efficiency improves, but the positioning and biasing spring functions become more complex
Solution Approach 1:
By segmenting the biasing spring functions into separate external and internal springs, the patent enables reduced pressure cavity volumes that minimize fluid compression energy losses. Each spring is dedicated to a specific function, which simplifies the overall system design despite the functional separation.
Solution Approach 2:
The internal positioning biasing spring (16) acts as an intermediary element that provides positioning feedback and maintains central location of the piston/cylinder assembly. This intermediary component enables precise control with minimal pressure cavity volume, thereby reducing energy losses from fluid compression.
3Productivity
If conventional eccentric mass mechanisms are used to accelerate dynamic mass and implement, then the system can perform vibratory work, but significant energy is wasted in accelerating and decelerating the dynamic mass
Solution Approach 1:
The patent employs a resonant vibratory mechanism that utilizes natural resonance of the one-dimensional implement to perform work. By exciting the system at its resonant frequency, the implement oscillates with maximum amplitude for minimum energy input, eliminating the need to continuously accelerate and decelerate large dynamic masses as in conventional eccentric mass mechanisms.
Solution Approach 2:
The system changes the operating parameters from continuous acceleration/deceleration cycles to resonant oscillation at a specific natural frequency. This parameter change allows the system to perform vibratory work with minimal energy input by utilizing the natural resonant properties of the implement rather than forcing acceleration against inertia.
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 configuration significantly improves efficiency by minimizing fluid compression and decompression, reducing wasted work, and maintaining the pure real natural frequency, resulting in increased energy availability for work and improved handling and manipulation of the system.
Implementation Method 1
a tuned and optimized dominant mass and biasing spring to enable pure, or near pure, resonant behavior
Implementation Method 2
The resonant vibrator of this disclosure uses a tuned and optimized dominant mass and biasing spring to enable pure, or near pure, resonant behavior within a connector and linear, one-dimensional object
Implementation Method 3
linear vibrator with a backing mass, separate internal and external biasing springs
Implementation Method 4
linear, piston-cylinder-style velocity source, vibratory mechanism
Data Source
AI summary
An efficiency-enhanced resonant system is provided with a backing mass connected to a linear vibrator, a parasitic mass connected to the linear vibrator, a positioning spring, a connecting device, and external biasing springs. The linear vibrator provides vibrating force to the parasitic mass which is connected to the connecting device, grasping a working implement. The use of separate positioning spring and external biasing springs accommodates a tuned system that balances the reduction in backing mass movement, avoids backing mass resonance within the working range of frequencies, and maintains a minimized linear vibrator stroke within the optimal range for one-dimensional implements within desired frequency ranges. The linear vibrator provides vibration that manifests as a frequency range of the natural frequency of the combined assembly of the parasitic mass, positioning spring, external biasing springs, connecting device, and implement, so that the resonant system efficiently performs work with minimized wasted energy.