Upgrading Hydraulic Models to Use Isothermal Liquid Blocks
Use the isothermal liquid domain to model hydraulic systems where the working fluid temperature remains constant during simulation.
Upgrade your legacy hydraulic models to use the Isothermal Liquid library blocks.
Each of the hydraulic example models listed on this page has a matching
isothermal liquid example model. You can open the models side by side to compare
them, or try converting any of the hydraulic models and comparing the result to the
corresponding isothermal liquid example model. For detailed, step-by-step examples
of converting and cleaning up one of these models, see hydraulicToIsothermalLiquid.
Topics
Get Started With Model Conversion
- Advantages of Using Isothermal Liquid Blocks
Blocks in the Isothermal Liquid library provide increased accuracy and numerical performance and are easier to use. - Upgrade Considerations When Converting Hydraulic to Isothermal Liquid Models
Learn about how to maintain the original model functionality after converting a model from hydraulic to isothermal liquid blocks by adjusting the blocks and block parameters.
Convert Your Model
- How to Upgrade Hydraulic Models
Learn how to use thehydraulicToIsothermalLiquidconversion tool and review the results. - Upgrading Systems with Enabled Library Links, Model References, and Subsystem References
Preserve the links between files in models that contain hydraulic blocks from custom Simulink® libraries, referenced models, or subsystems. - Upgrading Custom Hydraulic Blocks to Use the Isothermal Liquid Domain
Rewrite underlying code of custom hydraulic blocks to convert them to isothermal liquid domain.
Block Substitution Tables and Conversion Messages
- Conversion Messages After Converting Hydraulic to Isothermal Liquid Models
Learn about warning messages in the HTML report and recommended actions when you upgrade your models using thehydraulicToIsothermalLiquidconversion tool. - Block Substitutions for Foundation Library Hydraulic Blocks
Learn about the block substitutions thehydraulicToIsothermalLiquidconversion tool makes for Simscape > Foundation Library > Hydraulic library blocks.
Functions
hydraulicToIsothermalLiquid | Upgrade hydraulic block diagram to use isothermal liquid blocks |
hydraulicToIsothermalLiquidPostProcess | Restore original file names and links after upgrading hydraulic block diagram systems to use isothermal liquid blocks (Since R2021a) |
Simscape Blocks
| Interface (H-IL) | Flow connection between hydraulic and isothermal liquid networks |
Featured Examples
Hydraulic Actuator with Analog Position Controller
Warning: This example uses the hydraulic domain, which will be removed in a future release. Find an equivalent example model that uses the isothermal liquid domain here: Hydraulic Actuator with Analog Position Controller. To convert models to the isothermal liquid domain, use the hydraulicToIsothermalLiquid tool.
Hydraulic Actuator with Analog Position Controller and Dashboard Blocks
Warning: This example uses the hydraulic domain, which will be removed in a future release. Find an equivalent example model that uses the isothermal liquid domain here: Hydraulic Actuator with Analog Position Controller and Dashboard Blocks. To convert models to the isothermal liquid domain, use the hydraulicToIsothermalLiquid tool.
Hydraulic Actuator with Digital Position Controller
Warning: This example uses the hydraulic domain, which will be removed in a future release. Find an equivalent example model that uses the isothermal liquid domain here: Hydraulic Actuator with Digital Position Controller. To convert models to the isothermal liquid domain, use the hydraulicToIsothermalLiquid tool.
Hydraulic Actuator Configured for HIL Testing
Warning: This example uses the hydraulic domain, which will be removed in a future release. Find an equivalent example model that uses the isothermal liquid domain here: Hydraulic Actuator Configured for HIL Testing. To convert models to the isothermal liquid domain, use the hydraulicToIsothermalLiquid tool.
Cavitation Cycle
Warning: This example uses the hydraulic domain, which will be removed in a future release. Find an equivalent example model that uses the isothermal liquid domain here: Entrained Air Effects. To convert models to the isothermal liquid domain, use the hydraulicToIsothermalLiquid tool.
Hydraulic Actuator with Analog Position Controller
How the Foundation library can be used to model systems that span electrical, mechanical and isothermal liquid domains. In the model, a hydraulic system implemented in the isothermal liquid domain controls the mechanical load position in response to a voltage reference demand. If the reference demand is zero, then the hydraulic actuator (and load) displacement is zero, and if the reference is +5 volts, then the displacement is 100 mm.
Hydraulic Actuator with Analog Position Controller and Dashboard Blocks
Use the Foundation library to model systems that span electrical, mechanical and isothermal liquid domains.
Hydraulic Actuator with Digital Position Controller
A two-way valve acting in a closed-loop circuit together with a double-acting cylinder implemented in the isothermal liquid domain. The controller is represented as a continuous-time transfer function plus a transport delay. The delay allows for the computational time (one discrete time period) plus the zero-order hold (half a discrete time period) when implemented in discrete time. The model is configured for linearization so that a frequency response can be generated. To configure for faster desktop simulation, comment through the transport delay and increase the solver maximum step size.
Hydraulic Actuator Configured for HIL Testing
A physical system model and controller configured for HIL testing. It is derived from example Hydraulic Actuator with Digital Position Controller, ssc_isothermal_liquid_actuator_digital_control. The model has been configured for HIL testing by performing the following steps:
Entrained Air Effects
The effects of entrained air in a custom double acting cylinder. During the repeating cycle of oscillating pressure, the absolute pressure does not get below absolute zero as the bulk modulus of the homogeneous liquid-gas mixture decreases accordingly at low pressures.
