/MPC

Block Format Keyword Defines multi-point constraints on nodes.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/MPC/MPC_ID
MPC_title
Card 1 to N
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
node_ID1 Idof1 skew_ID1 α 1          
node_ID2 Idof2 skew_ID2 α 2          
etc etc etc etc          
node_IDN IdofN skew_IDN α N          

Definitions

Field Contents SI Unit Example
MPC_ID Multi-point constraint identifier

(Integer, maximum 10 digits)

 
MPC_title Multi-point constraint title

(Character, maximum 100 characters)

 
node_IDi Node identifier

(Integer)

 
Idofi Degree-of-freedom (velocity direction)

(Integer)

 
skew_IDi Local skew (for each DOF)

(Integer)

 
α i Scale coefficient

(Real)

 

Comments

  1. This option is not available if it is applied on:
    • a translational DOF of a node with a null mass
    • a rotational DOF of a node with a null inertia
  2. User-defined linear relation between nodal velocities.
  3. The N formats are necessary to define a kinematic relation between N velocity components. Each term may be expressed in its own local skew system (Skew_ID):(1)
    i = 1 N α V i d o f i s k ( n o d e ) = 0 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaabCaeaacq aHXoqycqGHflY1caWGwbWaa0baaSqaaiaadMgacaWGKbGaam4Baiaa dAgaaeaacaWGPbGaam4CaiaadUgaaaGccaGGOaGaamOBaiaad+gaca WGKbGaamyzaiaacMcacqGH9aqpcaaIWaaaleaacaWGPbGaeyypa0Ja aGymaaqaaiaad6eaa0GaeyyeIuoaaaa@4E15@

    i s k MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyAaiaado hacaWGRbaaaa@38CC@ = Skew_ID

    idof MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyAaiaads gacaWGVbGaamOzaaaa@39AC@ = 1...6

    1...3: translational velocity

    4...6: rotational velocity