Differential Pressure Transmitter Variable Sampling
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Solution Overview
Problem
Conventional differential pressure transmitting devices face a trade-off between stability and responsiveness, limiting their ability to meet high-speed responsiveness requirements in applications such as fuel control in gas turbine generators due to fixed sampling periods and intervals.
Innovation Solution
A differential pressure transmitting device with a damping time constant setting changer and a sampling condition automatic changer that adjusts the sampling period and/or interval to achieve faster calculation speeds, allowing for automatic shortening of sampling conditions when high-speed responsiveness is needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the damping time constant is increased to improve output stability, then the stability of the measured value is improved, but the speed of the calculating process is slowed down
Solution Approach 1:
The patent applies dynamics by making the sampling period variable rather than fixed. The processing device automatically adjusts the sampling period based on the damping time constant setting: when damping time constant is increased for stability, the sampling period is extended accordingly; when damping time constant is reduced for speed, the sampling period is shortened. This dynamic adjustment resolves the contradiction by adapting the sampling strategy to the current stability requirements.
2Stability of the object's composition
If the sampling period and sampling interval are set to long constant values to ensure stability, then the stability of the measured value is improved, but the responsiveness of the device deteriorates
Solution Approach 1:
The patent transforms the static sampling period into a dynamic parameter that automatically adjusts based on the damping time constant. When the damping time constant is set to a larger value for stability, the sampling period is automatically extended. When the damping time constant is reduced for responsiveness, the sampling period is shortened accordingly. This eliminates the need to choose between stability and responsiveness, as both can be optimized simultaneously through coordinated adjustment.
Solution Approach 2:
The processing device implements feedback by continuously monitoring the damping time constant setting and automatically adjusting the sampling period in response. This closed-loop control ensures that the sampling period always matches the current stability requirements, allowing the system to maintain optimal performance across different operating conditions without manual intervention.
3Speed
If the damping time constant is reduced to accelerate the calculating process, then the speed of calculation is improved, but the stability of the output deteriorates
Solution Approach 1:
The patent applies dynamics by coordinating the adjustment of both the damping time constant and the sampling period. When the damping time constant is reduced to improve calculation speed, the sampling period is simultaneously shortened to maintain stability. This coordinated dynamic adjustment ensures that neither parameter is optimized in isolation, preventing the deterioration of output stability while achieving faster calculation.
Data Source
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AI summary
When the damping time constant Dτ is changed to Dτ = 0, the sampling period Ts is automatically changed from 100 ms to 50 ms. The sampling time ts is automatically changed from 60 ms to 30 ms. Thus, when the damping time constant Dτ is changed to Dτ = 0, a processing unit (3) samples an electrical signal corresponding to the pressure difference of a fluid detected by a differential pressure sensor (1) for the sampling time ts=30ms in every sampling period Ts=50 ms, and finds the measurement value ΔP of the differential pressure by performing a variety of operation processing including a linearization operation and a square root operation on the sampled electrical signal. In the operation processing, the processing unit (3) does not perform a damping operation.