Tunable Valve Assembly Vibration Damping
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Solution Overview
Problem
Reciprocating high-pressure pumps used in oil and gas fields, particularly for hydraulic fracturing, experience significant vibration issues due to high peak pumped-fluid pressures, leading to rapid valve wear and structural damage from destructive resonance, which existing valve designs fail to adequately address.
Innovation Solution
A tunable valve assembly with a symmetrical valve body, integrated viscoelastic elements, and an adjustable preload flange that absorbs and dissipates closing impulse energy through hysteresis loss, narrowing the vibration spectrum and reducing resonance excitation by adjusting compliance and incorporating shear-thickening materials to delay valve closure and dissipate energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventionally-stiff valve body is used, then valve closure force is sufficient to seal at high pressures, but high-amplitude vibration and resonance damage occur in the pump housing
Solution Approach 1:
A resilient element is positioned between the valve body and valve seat to absorb impact energy during valve closure. This cushioning element reduces the transmission of high-amplitude vibration impulses to the pump housing, preventing resonance damage while maintaining adequate sealing force at high pressures.
Solution Approach 2:
The valve assembly utilizes composite construction combining rigid components (valve body, valve seat) with resilient materials (elastomeric or viscoelastic elements). This composite structure provides both the structural strength needed for high-pressure sealing and the vibration-damping properties needed to reduce resonance in the pump housing.
2Object-affected harmful factors
If valve closure is delayed to reduce impact energy, then vibration amplitude is reduced, but valve sealing effectiveness may be compromised
Solution Approach 1:
The resilient element is pre-positioned between the valve body and valve seat, ready to absorb impact energy during closure. This allows the valve to maintain adequate sealing force while the cushioning action reduces vibration amplitude, resolving the conflict between sealing effectiveness and vibration reduction.
Solution Approach 2:
The resilient element changes the dynamic parameters of valve closure by extending the closure duration and reducing peak impact forces. This parameter change allows the valve to achieve adequate sealing while transmitting lower-amplitude vibrations to the pump housing, simultaneously improving both sealing reliability and reducing vibration damage.
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 tunable valve assembly effectively reduces the amplitude and duration of closing impulse energy, minimizing vibration-induced damage and fatigue in pump housings, while maintaining durability and reducing maintenance costs.
Implementation Method 1
absorbs and dissipates closing impulse energy through hysteresis loss
Implementation Method 2
incorporating shear-thickening materials to delay valve closure and dissipate energy
Implementation Method 3
adjusting compliance
Data Source
AI summary
A tunable valve assembly comprises a valve body, an adjustable preload flange centrally coupled to the valve body, and a viscoelastic element; the assembly attenuates valve-generated vibration transmitted to a pump housing. The vibration spectrum is narrowed and its amplitude reduced through hysteresis loss of closing impulse energy. The viscoelastic element comprises a peripheral groove portion coupled to a central reservoir portion via a plurality of fenestration portions. At least a first predetermined assembly resonant frequency is achieved by changing valve assembly compliance (with associated hysteresis loss) through adjustment of annular shear preload applied by the flange to the viscoelastic element reservoir portion. Such preload adjustment effectively maximizes hysteresis loss at the resonant frequency. At least a second predetermined assembly resonant frequency is achieved through choice of a circumferential shear-thickening material within the viscoelastic element groove portion. Assembly resonant frequencies are chosen to approximate pump housing resonant frequencies.