Motion Simulation in NX

 Create Motion Simulation in NX 12 3D software

How to get NX Motion Simulation

Select application from Menu Bar : 

Motion icon appeared, as indicated in pic.

Click on highlighted icon, it is gateway of Motion Simulation.

it will take to Home, which exist in Menu bar.

click on  New Simulation, as highlighted

we will get Simcenter Motion Templates, where it will ask for file name and folder location to save.                                                                

After clicking ok to save file.

we will get Simulation Environment dialog box, we will set analysis type.

Here two options are available Kinematics/ Dynamics. select one of them, which is required for your System. in this case we are selecting Dynamics.

                

in this way we will get into NX Simulation environment, where we can access all tools which will be required to define conditions to system which is being under simulation.

Mechanism : under Home we will get Mechanism, there are Link, Joint etc tools available.

Link : Link is the first tool used to define the entities are taking for motion simulation.

Link dialog Box look like as indicated below, select a entity from NX window graphics for taking to simulation.

 

in this case a pulley is being selected, and allocating  name L001, it is by default created, you can change the name for your convenience . 

when we click on ok in Link dialogue box.

saved link L001, is appeared in Navigator.

Same way as we used above, we will create second link L002 for shaft which is inserted in pulley.

Joint : in building mechanism, Joint comes afterward Link. 

Joint is used to give motions to link. on clicking Joint a Joint dialogue box will be opened.

on top we will get the following three options:

1 Definition :   to define the type of joint to apply on a link.

2 Friction    :  if friction affects to be included in system simulation.

3 Driver      :  Give initial motion condition to joint which is being simulated

following steps to be followed for defining a joint.

1. We will select Revolute Joint from joint dialog box to spin pulley about axis.

2. Select Link L001 from navigator to define revolute.

3. Specify origin to locate axis about which pulley will be rotated, in this case we will define   X=0,Y=0,Z=0.

4. For defining orientation, specify the vector about which revolute joint will spin . In this case X axis is taken.

5. Name the joint, by default it will take J001.

Define Joint for Shaft: 

under joint type in dialogue box, select Fixed.

Link L002 to be selected to define fixed joint to shaft and click ok available in dialogue box to finish.

we will get  created Joint J001 and J002 in Navigator, as indicated below.

To give initial velocity to Link L001which is a pulley. we will double click on J002 available in navigator and dialogue Box will open. Select Driver and define 20°/s initial velocity under polynomial rotation type.

our system pulley and shaft is ready for solution just few more following inputs needs to define.

1. Define the time for duration of motion simulation will happen.

2. Define the steps for completion of time for which simulation would be run. 

3. Name to solution  as Solution_1

4. Click ok 

after clicking you get access to results 

on clicking on play the entities being simulated show virtual motion in NX graphics window.

How to define Slide joint to a System

Vernier caliber is taken to demonstrate Slide motion in a system.

Vernier scale has two parts one is a main scale which is fixed and a movable part which slide over main scale is called a Vernier scale.

Link : Link L001 is given to Main Scale.

            Link L002 is given to Vernier Scale 

Define Joint to system here is Vernier scale. 

Select Joint from Mechanism appeared in Tool bar

Select Slider for joint type appeared in dialogue box as highlighted below.

In Action, Select the object from NX window graphics area.

specify direction and origin from which sliding event starts.

Assign  J002 name to the joint.

also define velocity 1mm/s under driver and click ok

Now define the time period for which this system set up for sliding.

time and steps to be defined here.

Let us suppose it is performed for 60sec and time step to be taken 300 to arrive one to sixty seconds.

Once solver solve for defined inputs.we will get results.

Under animation we will get insights of sliding motion which is starting moving towards right as defined in x Direct under joint type.