Available options include: 

NODE 

SET 

Purpose: Define extra nodes for rigid body. 為剛體定義額外的節(jié)點(diǎn)（節(jié)點(diǎn)集）

PID：Part ID of rigid body to which the nodes will be added

     將添加節(jié)點(diǎn)的剛體的part ID

NID / NSID：Node (keyword option: NODE) or node set ID (keyword option: SET), see *SET_NODE, of added nodes.

     新增節(jié)點(diǎn)的node ID或者 Node Set ID

IFLAG：This flag is meaningful if and only if the inertia properties of the Part ID are defined in PART_INERTIA. If set to unity, the centerof-gravity, the translational mass, and the inertia matrix of the PID will be updated to reflect the merged nodal masses of the node or node set. If IFLAG is defaulted to zero, the merged nodes will not affect the properties defined in PART_INERTIA since it is assumed the properties already account for merged nodes.

     當(dāng)且僅當(dāng)PART_ INERTIA中定義了part ID的慣性屬性時(shí)，該標(biāo)志是有意義的。如果設(shè)置為1，PID的重心、平動(dòng)質(zhì)量和慣性矩陣將被更新，以反映節(jié)點(diǎn)或節(jié)點(diǎn)集的合并節(jié)點(diǎn)質(zhì)量。如果IFLAG默認(rèn)為0，則合并節(jié)點(diǎn)不會(huì)影響PART_INERTIA中定義的屬性，因?yàn)樗俣▽傩砸呀?jīng)包含在合并節(jié)點(diǎn)中。

Remarks: 

Extra nodes for rigid bodies may be placed anywhere, even outside the body, and they are assumed to be part of the rigid body. They have many uses including:

剛體的額外節(jié)點(diǎn)可以放置在任何地方，甚至可以放置在體外部，并假設(shè)它們是剛體的一部分。它們有許多用途，包括：

1. The definition of draw beads in metal forming applications by listing nodes along the draw bead.
2. Placing nodes where joints will be attached between rigid bodies.
3. Defining a node where point loads are to be applied or where springs may be attached.
4. Defining a lumped mass at a particular location.

1. 拉延筋在金屬成形應(yīng)用中的定義，通過(guò)列出沿拉延筋的節(jié)點(diǎn)。
2. 在剛體之間放置連接節(jié)點(diǎn)。
3. 定義一個(gè)節(jié)點(diǎn)，在該節(jié)點(diǎn)上要施加點(diǎn)荷載或者在該節(jié)點(diǎn)上可以附加彈簧。
4. 在特定位置定義一個(gè)集中質(zhì)量。

The coordinates of the extra nodes are updated according to the rigid body motion.

根據(jù)剛體運(yùn)動(dòng)更新額外節(jié)點(diǎn)的坐標(biāo)。

Examples:

01：Rigidly attach nodes 285 and 4576 to part 14. (Part 14 MUST be a rigid body.)

    將節(jié)點(diǎn)285和4576剛性連接到 Part 14上。( Part14 必須是一個(gè)剛體（rigid body）。)

*CONSTRAINED_EXTRA_NODES_NODE

$ pid nid

  14     285

  14    4576

02：Rigidly attach all nodes in set 4 to part 17. (Part 17 MUST be a rigid body.)

    將節(jié)點(diǎn)集 4 中的所有節(jié)點(diǎn)剛性連接到 Part 17上。(part17 必須是一個(gè)剛體（rigid body）。)

In this example, four nodes from a deformable body are attached to rigid body 17 as a means of joining the two parts.

在這個(gè)例子中，來(lái)自一個(gè)可變形體（非剛體或者成為柔性體）的四個(gè)節(jié)點(diǎn)被附加到 Part 17上，作為連接這兩個(gè)part的手段。

*CONSTRAINED_EXTRA_NODES_SET

$ pid nsid

  17     4

*SET_NODE_LIST

$ sid

   4 

$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8

 665  778  896  827