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Version 1.2 (R2007a) SimHydraulics Software

This table summarizes what's new in Version 1.2 (R2007a):

New Features and ChangesVersion Compatibility ConsiderationsFixed Bugs and Known ProblemsRelated Documentation at Web Site
Yes
Details below
Yes—Details labeled as Compatibility Considerations, below. See also Summary.Bug Reports
Includes fixes
No

New features and changes introduced in this version are

SimHydraulics Now Requires Simscape

SimHydraulics now depends on and requires Simscape, the platform for all Physical Modeling products, which includes common Physical Modeling utilities and block libraries.

Block Libraries Moved from SimHydraulics to Simscape

The Foundation and Utilities block libraries that used to be included in SimHydraulics (V1.0 and V1.1) are now part of Simscape product.

Sharing Models Using the Simscape Editing Modes

When working with SimHydraulics models, you now have a selection of two Simscape editing modes that allow full or restricted editing of models.

New SimHydraulics Blocks

The new blocks introduced in Version 1.2 are listed below:

Initial Conditions Added for Certain Blocks

Several blocks now have a parameter that specifies the initial condition for use in computing the block's initial state at the beginning of a simulation run. Note that some of these blocks, which used to be included in SimHydraulics (V1.0 and V1.1), are now part of Simscape product. The following is a complete list of blocks where you can specify an initial condition through the block dialog box:

For details, see the block reference pages.

Compatibility Considerations

In this version, there is a difference in the way the initial conditions are computed, and as a result, the blocks that have an initial condition parameter work differently than they used to in the previous version.

Block Library Links Must Be Resolved

All SimHydraulics blocks in your models must now have resolved block library links. You can neither disable nor break these library links. This is a global requirement of Simscape modeling environment. Consult the Simscape documentation for further details.

Compatibility Considerations

If you have an existing SimHydraulics model with disabled or broken links from SimHydraulics blocks to the SimHydraulics block library, you must restore all the broken block library links for your model to be valid.

If you have disabled or broken the SimHydraulics library link for blocks that you have customized and want to keep these modified blocks in your model, you must move these modified blocks to your own custom library or libraries, then copy the block instances that you need to your model.

You must still restore the block link to its parent library, whether that parent library is SimHydraulics or your own.

Changes to SimHydraulics Demos

The following demos have been added in Version 1.2:

Demo Name

Description

Hydraulic Actuator with Two-Chamber Snubbers
(sh_actuator_with_2_chamber_snubbers)

The reciprocal actuator demonstrated in this model is equipped with snubbers (cushions) on both sides of the cylinder.

Digital Hydraulic Actuator
(sh_digital_hydraulic_actuator)

The digital hydraulic actuator consists of three double-acting cylinders mounted in the same shell and interconnected through the hard stops.

Hydraulic Actuator with Load-Sensing Variable-Displacement Pump
(sh_hydraulic_actuator_load_sensing_pump)

The circuit demonstrates usage of a load-sensing and pressure-limiting unit in a conventional reciprocal system with variable load on the forward stroke.

Hydraulic Actuator with Telescopic Cylinder
(sh_hydraulic_actuator_telescopic_cylinder)

The actuator is built around a telescopic hydraulic cylinder, which is equipped with three rods interacting with each other through hard stops.

Closed-Circuit Reciprocal Actuator
(sh_hydraulic_closed_circuit_reciprocal_actuator)

The demo illustrates a closed-circuit electrohydraulic actuator driven by a variable-velocity electrical motor.

Power-Assisted Steering Mechanism
(sh_hydraulic_power_assisted_steering)

The model represents a simplified version of a power-assisted steering mechanism showing all its major parts.

Hydraulic System with Servo-Valve
(sh_hydraulic_system_with_servo_valve)

The demo represents the model of a two-stage servo-valve with a 4-way, 3-position spool valve in the power stage and a flapper-nozzle amplifier in the pilot stage.

Hydraulic Transmission with Secondary Control
(sh_hydraulic_transmission_secondary_control)

The system demonstrates usage of the so-called secondary control in hydrostatic transmissions with a variable-displacement motor.

Hydrostatic Transmission with Shuttle Valve
(sh_hydrostatic_transmission_shuttle_valve)

The circuit demonstrates a hydrostatic transmission with a shuttle valve in the control unit.

Hydraulic Circuit with Load-Sensing Velocity Control
(sh_load_sensing_velocity_control)

The circuit is equipped with the load-sensing velocity regulator installed between the pump and directional valve.

Oscillating Hydraulic Mechanism
(sh_oscillating_hydraulic_mechanism)

The oscillating hydraulic mechanism consists of a single-acting hydraulic rotary actuator, winch, flow control valve, two-position electrohydraulic valve, and power and control units.

Reciprocal Actuator with Counterbalance Valves
(sh_reciprocal_actuator_cntrb_valves)

The actuator is built of a double-acting cylinder, directional valve, flow control, block of counterbalance valves, power unit, replenishment arrangement, and a control unit.

Sequencing Circuit with Rotary Actuators
(sh_sequencing_circuit_rotary_actuators)

The sequence circuit is based on four check valves installed in both pressure and return lines of the second rotary actuator.

The following demos that used to be in SimHydraulics 1.1 are now part of Simscape product:

Demo Name

Description

Simple Mechanical System
(ssc_simple_mechanical_system)

This model is built of both rotational and translational mechanical blocks to illustrate their use in a system.

Mechanical System with Translational Friction
(ssc_mechanical_system_translational_friction)

The demo illustrates a mass loaded with a spring and viscous damper.

Mechanical System with Translational Hard Stop
(ssc_mechanical_system_translational_hardstop)

The demo illustrates two masses interacting through a hard stop.

Mechanical Rotational System with Stick-Slip Motion
(ssc_rot_system_stick_slip)

This model demonstrates a mechanical rotational system, where a load is driven by a velocity source with a friction element between them, and stick-slip motion is developed in the regions of constant velocities.

Linkage Mechanism
(ssc_linkage_mechanism)

The model demonstrates the use of the Lever block in a linkage mechanism.

  


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