Fluidic Pulsation Attenuator with Steep Rolloff Slope
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Solution Overview
Problem
Conventional fluidic systems with fluidic pumps face challenges in efficiently attenuating pulsations, leading to unstable flow rates and fluid waste due to slow adjustment times.
Innovation Solution
A pulsation attenuator comprising a fluidic channel with a combination of first and second fluidic devices, each containing a resistor and capacitor, configured to provide a steep rolloff slope, effectively attenuating low-frequency fluctuations and high-frequency pulsations, similar to a high-order electronic low-pass filter, allowing rapid flow rate adjustment and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional pulsation attenuators are used, then pulsations are attenuated, but the adjustment time is long (minutes) and fluid waste occurs
Solution Approach 1:
The system is divided into multiple independent pulsation attenuators (first and second attenuators) with different cutoff frequencies. Each attenuator handles specific frequency ranges, allowing parallel processing of different pulsation components and enabling faster overall attenuation without compromising stability
Solution Approach 2:
Multiple pulsation attenuators with different cutoff frequency parameters are employed. The first attenuator has a higher cutoff frequency while the second has a lower cutoff frequency, creating a coordinated frequency-dependent attenuation system that achieves rapid stabilization across the full pulsation spectrum
2Reliability
If a single pulsation attenuator is used, then the system is simple, but it cannot effectively attenuate both low-frequency fluctuations and high-frequency pulsations
Solution Approach 1:
The frequency spectrum is segmented into different ranges, with each pulsation attenuator responsible for a specific segment. This division allows comprehensive coverage of both low and high-frequency pulsations while keeping each individual attenuator relatively simple in design
Solution Approach 2:
Each pulsation attenuator is designed to handle multiple functions: attenuating pulsations within its frequency range, maintaining flow rate stability, and working cooperatively with other attenuators. This multi-functionality reduces the need for additional specialized components
3Reliability
If a shallow rolloff slope is used, then the system is simpler, but low-frequency fluctuations and high-frequency pulsations cannot be effectively differentiated
Solution Approach 1:
The frequency attenuation task is segmented across multiple attenuators with different rolloff characteristics. By combining their effects, the system achieves an overall steep rolloff slope that effectively differentiates between frequency ranges without requiring any single device to be overly complex
Solution Approach 2:
Multiple pulsation attenuators act as intermediaries that collectively provide the steep rolloff effect. Each attenuator contributes to the overall frequency discrimination, and their combined action achieves the desired sharp transition between passband and stopband without requiring a single high-order filter
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 enables rapid stabilization and minimization of fluid waste by efficiently attenuating pulsations, reducing adjustment time from minutes to seconds and maintaining smooth flow, with a cutoff frequency suitable for fluidic systems.
Implementation Method 1
a first fluidic device (14) adapted to attenuate pulsations, and a second fluidic device (16) adapted to attenuate pulsations
Implementation Method 2
The first fluidic device (14) preferably includes a first fluidic resistor (26) and a first fluidic capacitor (28), and the second fluidic device (16) preferably includes a second fluidic resistor (30) and a second fluidic capacitor (32)
Data Source
Figure 1~2
Figure 3~6
AI summary
A pulsation attenuator for a fluidic system with a fluidic pump. The pulsation attenuator includes a fluidic channel, a first fluidic device adapted to attenuate pulsations with a shallow rolloff slope, and a second fluidic device adapted to attenuate pulsations with a shallow rolloff slope. The first fluidic device and the second fluidic device are connected to the fluidic channel such that they cooperatively attenuate pulsations with a steep rolloff slope. Preferably, the first fluidic device includes a first fluidic resistor and a first fluidic capacitor, and the second fluidic device includes a second fluidic resistor and a second fluidic capacitor. Preferably, the pulsation attenuator is arranged, similar a second-order low-pass filter, in the following order: (l) first fluidic resistor, (2) first fluidic capacitor, (3) second fluidic resistor, and (4) second fluidic capacitor.