N
Hello,
I am working as a instrumentation & control engineer in a private shipping company.
I want to measure the liquid level of a tank kept inside a big boat which is subjected to severe oscillations (boat dynamics) while the boat is in movement inside the sea.The tank level has to be kept at 50 % exact for ideal plant operation. Actually we are using a level transmitter fixed at the bottom of the tank which will give an ouput of 4 to 20 ma when the tank level is between 0 to 100%.This output of the LT is used to drive a variable speed drive of a motor which will pump more fluid so as to keep the level at desired set value.
But assuming the level is at 50%, the corresponding ma output should be 12 ma, which is alright when the boat is at standstill. When the boat is put in operation inside the sea, the waves causes oscillations in the boat and in turn causes the tank liquid to oscillate up and down , even though the mass of the liquid remains the same,which causes the LT output to osillate between 10 to 14 ma which results in the unwanted hunting nof the motor speed and this prevents the system in attaining a steady state which is undesirable.
Can anyone of you, suggest a suitable method or algorithm which helps in determining the tank level even if the ship barge oscillates.
regards,
N.VEDACHALAM
[email protected]
[email protected]
[email protected]
I am working as a instrumentation & control engineer in a private shipping company.
I want to measure the liquid level of a tank kept inside a big boat which is subjected to severe oscillations (boat dynamics) while the boat is in movement inside the sea.The tank level has to be kept at 50 % exact for ideal plant operation. Actually we are using a level transmitter fixed at the bottom of the tank which will give an ouput of 4 to 20 ma when the tank level is between 0 to 100%.This output of the LT is used to drive a variable speed drive of a motor which will pump more fluid so as to keep the level at desired set value.
But assuming the level is at 50%, the corresponding ma output should be 12 ma, which is alright when the boat is at standstill. When the boat is put in operation inside the sea, the waves causes oscillations in the boat and in turn causes the tank liquid to oscillate up and down , even though the mass of the liquid remains the same,which causes the LT output to osillate between 10 to 14 ma which results in the unwanted hunting nof the motor speed and this prevents the system in attaining a steady state which is undesirable.
Can anyone of you, suggest a suitable method or algorithm which helps in determining the tank level even if the ship barge oscillates.
regards,
N.VEDACHALAM
[email protected]
[email protected]
[email protected]