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# Yifeng Tang

### MathWorks

Last seen: Today Active since 2020

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sh_cyl_counterbalance_valve example: artificial results when 0 input?
Hi Chris, I tried to make Load and Flow Rate blocks zero and seem to get what you saw as well. Look like the initial "spike" co...

ungefär en månad ago | 0

4-way directional valve from matlab simscape calculates volume flow incorrectly.
The flow rate sensor that is supposed to measure the flow rate out of Port A, appears to have a branch before it, which allows t...

ungefär 2 månader ago | 0

Evolving 'Aggregate Equivalent Length of local resistances' within a simulation?
Since you have access to the Simscape code of this block, you may make the 'Aggregate Equivalent Length of local resistances' no...

How can I move a double acting cylinder by force?
I believe it's because of the force sensor you have on top of the picture. A force sensor needs to be placed in line with the a...

Modeling condensation on walls using Simscape Moist Air
Starting R2022b, the Pipe block in the Moist Air domain contains the "Effect of Condensation on Wall Surface". It's different f...

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Thermal Liquid Tank in simscape
I don't think there is a more easy or efficient way in your case. In the latest version of Simscape, however, you can get up to...

Is it possible to create Packed bed thermal model in simscape?
Attempt to answer from 4 years later ... (1) I think the easiest way is to use a Pipe block. Attach the right amount of therm...

SimHydraulics - double centrifugal pump
The centrifugal pump block is available in Simscape Fluids for the Hydraulic domain since R2007a and for the newer Isothermal Li...

Pressure in a closed thermal liquid system
You'll need a "tank" to stablize this. What happens is that the density of the fluid is a function of pressure and temperatur...

I have confusion in Simscape Co2 transcritical system example. How you had designed compressor i dont get it and why you used PS LOOK UP TABLE 2D IN COMPRESSOR. Do i need a specific date to run this
The 2D LUT and an ideal flow rate source is to represent the BEHAVIOR of a compressor. If the pressure ratio (outlet/inlet) ris...

Looking for the base model of the counter balance valve
comment from 8 years later, lol. I don't think you can access the source code behind the blocks in Simscape Fluids (new product...

SimHydraulics "Failed to solve using iteration matrix. Initial conditions solve failed to converge."
Force sensor should be placed inline with there the force passes through, just like measuring a current. The force sensor in yo...

Hydraulic circuit between two pressure sources
The pressure sensor you have there blocks the flow totally, lol. It's like voltmeter where no current is let through. Usually ...

How to solve unconverged equations error ?
My experience: this typically happens when the piston moves while flow is constricted in the expanding chamber of the cylinder. ...

I am guessing, you are trying to build a valve block that will achieve any given pressure at its outlet? I think the best way t...

How does the Gate Valve (TL) block utilize "Cross-sectional area at ports A and B" and "Characteristic longitudinal length"?
In the latest version (R2022a), this characteristic length isn't a parameter anymore. In an earlier version (R2020b), I couldn'...

Simscape simulation of Hydraulic/Gas chamber
Maybe this will work: Use the TL-G tank and the insulators you mentioned. It should be able to do 1-4 and 6 of your requirement...

Simscape Fluids Valve models: Do they exhibit non-linearity too?
The Simscape valve components uses the spool position signal at the S port to determine the orifice areas (or dP-Q relationships...

Hi Brett, I think we have discussed this during a meeting. Just put some notes here so more people may benefit from your quest...

Cant implement the heat exchanger (simscape library) in an existing simulink model
You probably need a few (Controlled) Reservoir (TL)blocks to prescribe the pressure and temperature boundary conditions, and a C...

Simulink Thermal Hydraulic systems specify elevation
I would recommend that you try the Tank (TL) and Pipe (TL) from the Simscape Fluids library. Both allow you to specify an eleva...

Customized Simscape convective heat transfer component not working
Hi Roland, I believe you are missing one equation to define how Q is related to the heat flow through the ports. Try adding th...

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Trapped air in fluid
The entrained air affects how the bulk modulus (hence also density) changes as a function of the pressure. More air will make t...

Dynamic calculating of kinematic viscosity
The source code of all Simscape foundation library blocks are available, including the hydraulic domain. I can verify back to t...

What would be the total flow rate inside the hydraulic cylinder chamber when modeled with piston chamber and hydro-mechanical converter?
The first a few paragraphs of the documentaion pages for theTranslational Mechanical Converter (IL) and the Translational Hydro-...

How to move the rod of a cylinder?
So far, the only way in Simscape to prescribe a mechanical motion is using a velocity source, while in Simscape Multibody, the o...

Specific and ideal pressure and flow
In general, one cannot prescribe both the pressure at and the flow through a node at the same time. If a pressure is prescribed...

Depending on what physical domain you are thinking of, a few pipeline blocks in the Simscape Fluids library allow the modeling o...