Week 6

                                                               WEEK6-(REAR DOOR) MODEL

• AIM: To give different types of connection for rear door model of car . These connections are given to the model using ANSA in NASTRAN deck which will be used later for NASTRAN deck which will be used later for NVH simulation .

• METHODOLOGY: 

• Import the meshed model
• Assign the property ID(PID) for different regions and identify different mechanism and assign varrious connection for rear door model .

• PROCEDURE:

STEP1: Import the model. before assining connection for the model once observe  the real car model as it gives idea for the different types of connection used for varrious mechanism 

STEP2: Assign different PIDS for glass and the parts which are needed to be welded 

STEP3:In this challenge we use different kind of connection. the varrious conection are as follows:

• RB2 Rigit is simply used to rigidize the hole . this type of connection is used where there are no bolts or washer element .
• ZONE cut is used when an area must be rigidized at particular region . this region act as a washer element during simulation . Now use element RB2 many nodes , select the region using poly line selection in order to select all the slave node easily . then RB2 connection is deployed along with zone
• Cluster or spider RB2: This connection is used when a mannual bolt connection must be deployed between 2 or more surface 
• for automatic bolt connection one must follow these steps , first create COG for the hole .COG is basically a 3D point, convert this 3D point to belt .Now open connections manager and select the bolt symbol which has created in earlier step 
• spot weld are also parts of connections . In ANSA spot weld can be developed between different surfaces 
• mostly overlap shell is used when the surface are parallel and y joint shell is used in perpendicular surfaces

• spot weld using RBE3-HEXA RBE3:

• Create COG , Convert COG to spot welding point and use connection manager to generate RBE3-HEXA-RBE3
• CONMI: It is refered to as con mass . it basically a connection where a point is created for representing the weight of it . we must give the mass in tonnes . here we gave the mass as 100gm which is 0.0001 ton 
• CBUSH Connection : this connection for the given glass is always given in closed 1st create curves using perimeter .Then convert those curves to seam line . now using connection manager assign 'p','s' values and select RBE3-CRUSH-RBE3 as FE type for generating CBUSH connection. 
• generated RBE3-CRUSH-RBE3 connection has its own local corrdinates which are diiferent form each other. this could create some disturbance during simulation .so ,we need to convert all the CRUSH coordinal to golbal coordinals. this can be done by changing the CID value to 0 in CRUSH properties
• we can change all the CID values in a single shot using modify option.
• Atmosphere strip (or simply rubber strip) can be assigned in ANSA .

• CONCLUSION:In this challenge, have deployed connection with RB2 and  RB3 element successfully. constrained the hinges to five degree of freedom . learned different concepts regarding tailored cut learned all types of connections used in ANSA