Pendulum Vibration Absorber for Pumping System Torsional Control
Solution Overview
Problem
Rotary machines, particularly pumping systems, face challenges in managing torsional vibrations, which can lead to mechanical fatigue and failure if not addressed effectively, especially in complex systems with multiple sources of rotation and reciprocation.
Innovation Solution
A pendulum damper mechanism is integrated into the driveline of a pumping system, featuring a carrier with pivotable pendulum absorbers that respond to torsional vibrations, and a gearbox that adjusts the speed of rotation to alter the tuning order of the vibration-limiting mechanism, allowing for effective amplitude reduction of torsional vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibration-limiting mechanism is added to the driveline, then torsional vibration amplitudes are reduced, but device complexity increases
Solution Approach 1:
The patent applies a pendulum-based vibration absorber that utilizes mechanical vibration principles to counteract torsional vibrations in the driveline. The pendulum absorber is tuned to resonate at the same frequency as the driveline vibrations, creating an opposing vibration that cancels out the harmful torsional oscillations, thereby reducing vibration amplitudes without requiring complex electronic or active control systems
Solution Approach 2:
The pendulum absorver acts as an intermediary element between the driveline and the vibration source. It is coupled to the driveline through a mounting structure that allows the pendulum to pivot freely, enabling it to absorb and dissipate vibrational energy while isolating the main driveline components from the full impact of torsional vibrations
2Volume of moving object
If speed reduction is implemented through gearbox, then the size of vibration-limiting mechanism can be reduced, but device complexity increases
Solution Approach 1:
The patent utilizes speed reduction to change the operating parameters of the pendulum absorber system. By reducing the rotational speed through the gearbox, the pendulum absorber can be designed with smaller dimensions while maintaining its vibration-absorbing effectiveness. The tuned natural frequency of the pendulum is adjusted to match the reduced speed conditions, allowing for a more compact design
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 pendulum damper mechanism effectively limits torsional vibration amplitudes, preventing damage to transmission and driveline components by pivoting absorbers that cancel out torsionals, and allows for a smaller, more efficient design due to speed reduction, addressing the challenge of managing complex vibrational phenomena.
Implementation Method 1
a plurality of pendulum absorbers coupled to the carrier and each being pivotable about a separate pivot axis in response to torsional vibrations of the driveline
Implementation Method 2
a plurality of pendulum absorbers coupled to the carrier and each being pivotable about a separate pivot axis
Implementation Method 3
a gearbox coupled between the transmission and the pump and including an input gear coupled with the driveline and structured to rotate at a speed of rotation of the driveline, and an output gear coupled with the pump shaft and structured to rotate the pump shaft at a speed of rotation that is different from the speed of rotation of the driveline
Data Source
AI summary
A mechanism for limiting vibration amplitudes in a pumping system includes a plurality of pendulum absorbers coupled with a carrier and each having a pivoting range. The pendulum absorbers each further include a first and a second contact surface that contacts an outer peripheral surface of the carrier at limit stop positions, and each having a shape that is conforming with a shape of the outer peripheral surface. The pumping system may be used for pumping liquid nitrogen.