Where can i find the blocks of feedforward system?

[Wormwood]

Hi,

I would like to create a feedforward system. However from what i've learn in a feedforward system i'll need a gain, deadtime and lead-lag block, where can i find these 3 blocks? i'm using LB8.2 and in the example finder i can only find 1 example, which is "Control Loop (with VFF and AFF).lvporg" but i cant open it due to missing parts. Are there any other examples that i can use as references? A simple and basic form of a feedfroward system.

With Regards

Wormwood

[CharlieM]

Hi Wormwood,

I could not find any examples that would do Feedforward or Predictive control without any additional add-ons. Control applications such as this, are currently handled in the add-ons that you have found: System Identification Toolkit, Control Design Toolkit and ideally the SoftMotion Development Module.

[Ben]

Charlie,

Look in the PID tool kit.

Ben

[Barp]

Look at the example: Simulation - Cascade and Feedforward Surge Tank Level.vi that comes with LabVIEW Real-Time or with the PID Control Toolkit.

Here is the screen shot of it.

[Barp]

Look at the example: Simulation - Cascade and Feedforward Surge Tank Level.vi that comes with LabVIEW Real-Time or with the PID Control Toolkit.

Here is the picture if you want to see the controller implemented in LabVIEW. The Feedforward is a Lead-Lag block. Hope this helps

Message Edited by Barp on 01-02-2008 09:01 PM

[Wormwood]

Hi everyone;

Thanks for your help, so does this mean that LB does not have individual blocks say deadtime? From what i i've seen from the example, it didnt mention about the deadtime. And is there exactly a block for a 1st order lag?

With Regards

Wormwood

[parthabe]

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Wormwood wrote:

... so does this mean that LB...

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Say it as LV for LabVIEW, not LB that means the Unit for Mass...

[Wormwood]

Ooops, yeah, sorry about that, its LV

[parthabe]

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Wormwood wrote:

From what i i've seen from the example, it didnt mention about the deadtime. And is there exactly a block for a 1st order lag?

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Hi Wormwood,

I think Ben had already told the answer for a ll Control System design needs...

You should have either the PID toolkit or teh Control Design toolkit, to get those functions.

Check it out soon with someone from NI.

[Wormwood]

Hi,

Erm, i dont know if i have the "Control Design Toolkit". However, what i have in my palette for "control design and simulation" looks like this:

Is this the one?

With Regards

Wormwood