Adaptive Filter Control for Fluid System Pressure Fluctuations
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Solution Overview
Problem
Fluid dynamic systems operate inefficiently due to unknown and changing system states, leading to excessive energy consumption as positive displacement machines are operated to meet undefined demands, resulting in unwanted pressure fluctuations and vibrations.
Innovation Solution
A measuring and control device with a pressure fluctuation generator and adaptive filters that actively reduce pressure fluctuations, continuously optimizing to identify system states and adjust the machine's operation to an efficient operating point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turbomachine or positive displacement machine is operated to meet undefined system demands, then the system requirements are always met, but energy consumption increases excessively
Solution Approach 1:
The system uses pressure sensors to continuously monitor pressure fluctuations in the fluid dynamic system and feeds this information back to the control unit. The control unit processes this feedback signal and adjusts the actuator to modify the pressure fluctuations, creating a closed-loop control system that enables energy-efficient operation while meeting system demands
Solution Approach 2:
The system performs self-diagnosis by evaluating filter coefficients to identify system states and detect changes autonomously. The measuring and control device automatically determines the operating point of the turbomachine and adjusts parameters without external intervention, enabling the system to serve itself in optimizing energy consumption
2Adaptability or versatility
If the fluid dynamic system operates with unknown system states, then the system can handle variability, but measurement and identification become impossible
Solution Approach 1:
The system uses pressure fluctuations as an intermediary signal to indirectly measure and identify system states. By analyzing the characteristics of pressure fluctuations propagated through the fluid dynamic system, the control unit can infer information about valve positions, hydraulic actuator states, and turbomachine operating conditions without directly measuring these parameters
Solution Approach 2:
The system replaces direct mechanical measurement of system states with acoustic/pressure-based measurement. Instead of using complex mechanical sensors to directly measure valve positions or actuator states, the system uses pressure sensors to detect pressure fluctuations that carry information about these mechanical states, substituting a simpler measurement approach
3Productivity
If the turbomachine operates at high power to meet all possible demands, then sufficient flow rate is always supplied, but energy efficiency decreases
Solution Approach 1:
The system dynamically adjusts the operating parameters of the turbomachine based on real-time system conditions. The control unit continuously evaluates filter coefficients to identify current system states and determines the optimal operating point, allowing the turbomachine to operate efficiently at varying power levels rather than at constant high power, thus maintaining productivity while reducing energy losses
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
Enables energy-efficient operation of turbomachines and positive displacement machines by identifying system states and reducing acoustic emissions, allowing for predictive maintenance and significant energy savings.
Implementation Method 1
a first control unit (17) with an adaptive filter having a plurality of filter coefficients. The first control unit (17) is configured to receive a pressure fluctuation signal from the first pressure sensor (15), receive or generate a reference signal, generate a control signal from the reference signal using the adaptive filter, control the pressure fluctuation generator (16) with the control signal and continuously optimize or adjust the adaptive filter to minimize the pressure fluctuation signal
Implementation Method 2
a pressure fluctuation generator (16) for actively reducing pressure fluctuations in the fluid dynamic system
Implementation Method 3
These pressure changes propagate as wave-like pressure fluctuations or pressure pulsations at the speed of sound
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a measuring and/or control device (10) for a fluid-dynamic system (11), the fluid-dynamic system (11) comprising a flow or displacement machine (12), conduits (13), and at least one further fluid-dynamic component (14). A pressure fluctuation signal (18) is received from a first pressure sensor (15), a reference signal is received or generated, and a control signal (19) for a pressure fluctuation generator (16) is generated from the reference signal by means of the adaptive filter. An adaptive filter is continuously optimised in order to minimise the pressure fluctuation signal (18). A second control unit (21) evaluates the filter coefficients (20) of the adaptive filter of the first control unit (17) and, by means of said evaluation of the filter coefficients (20), controls the speed of the flow or displacement machine (12) of the fluid-dynamic system (11) to an efficient operating point of the flow or displacement machine (12) in the fluid-dynamic system (11).