In this exercise, you will learn how to: • Use the entity selector and the extended entity selection menu to select and unselect nodes and elements from the graphics area. • Use the direction selector to define vectors along which to translate nodes and elements. • Switch between different entities to select and methods to define vectors. • Toggle between two options. • Enter, copy and paste, and calculate numbers. • Use the rapid menu functionality to execute commands with the mouse buttons rather than clicking buttons. • Interrupt, but not exit, a panel to go to another panel using the keyboard function keys. Exercise Step 1: Open and view the model file, bumper.hm. Step 2: In the translate panel, select nodes from the graphics area. 1. Open the Translate panel by clicking Mesh > Translate > Nodes. 2. Select a few nodes from the graphics area by left-clicking the corners of the elements. Node selector The cyan border around it indicates that it is active; HyperMesh is expecting nodes to be selected as the next action. A node is positioned at each element corner. A selected node is highlighted with a small, white circle. Node Handles 3. Reset the selection of nodes by clicking the reset icon, . Step 3: Select and unselect elements from the graphics area. 1. Click the entity selector switch ( ) and select elems. (Switch the entity selector to elems.) Entity selector with its switch The menu that pops-up contains a list of entities that can be translated. 2. With the elems selector active, select several elements from the graphics area. To select an element, click its element handle (the dot at the element’s center). The elements are highlighted in white when they are selected. Element Handles 3. Unselect an element using the right mouse button. Step 4: Select and unselect elements using the quick window selection method. 1. Verify that the elems selector is active. 2. Move the mouse handle into the graphics area. 3. Press and hold the SHIFT key + left mouse button and move the mouse to draw a rectangular window around a few elements, and then release the SHIFT key and left mouse button. All the element handles inside the rectangular window are selected. 4. Unselect elements by pressing and holding the SHIFT key + right mouse button and moving the mouse to create a window around the selected elements. 5. Press the SHIFT key and quick-click the left mouse button. A pop-up window appears, which contains four icons as shown in the following image. Quick window pop-up menu 6. Select the inside polygon shape . 7. Press and hold the SHIFT key + left mouse button and move the mouse around a few unselected elements, and then release the SHIFT key and mouse button. This draws a polygon window rather than a rectangular window. All element handles inside this window are selected. Step 5: Select and unselect elements by using the extended entity selection menu. 1. Click the elems selector and select reverse. (Select elems >> reverse.) The selection of elements is reversed; the elements that were selected are now unselected and the elements that were not selected are now selected. The menu that appears contains a list of functions for selecting elements. Once you select a function from the menu, the menu disappears. If you do not want to select a function, move the mouse handle out of the menu. Extended entity selection menu 2. Select elems >> by adjacent. Elements adjacent to the selected elements are now selected. Step 6: Shade the elements, reset the selection, and select a few adjacent elements. 1. On the Visualization toolbar, click Shaded Elements and Mesh Lines, . The elements are displayed in shaded mode, rather than wireframe mode. 2. In the Translate panel, click the reset icon ( ) to clear the elements selection. 3. With the elems selector active, select a few elements that are adjacent to each other. Step 7: Specify a direction vector (N1 and N2 only) along which to translate the selected elements. 1. Click the direction selector switch , . Direction selector along with the node selectors to define the direction vector The menu shown in the following image appears. It contains a list of vector and plane options for defining the direction in which to translate the selected elements. Direction selector pop-up menu 2. Select N1, N2, N3 from the pop-up menu. 3. Click the N1 to activate the selector. N1 now has a cyan border indicating it is the active selector. The selected elements are displayed in gray because the elems entity selector is not active 4. In the graphics area, select any node for N1. The selected node is highlighted in green. The active selector advances to N2. 5. Select a node near N1 for N2. The selected node is highlighted in blue. The active selector advances to N3. Do not select a node for N3. Note: Selecting the two nodes, N1 and N2, defines a vector for the direction of translation. This vector goes from N1 towards N2. Selecting a third node, N3,defines a plane. The direction of translation is the positive direction of the vector normal to the plane. The positive direction is determined by the right-hand rule. Step 8: Specify a distance to translate the selected elements and then translate them. 1. Click the toggle ( ) to change magnitude = to magnitude = N2-N1. 2. Click translate +. The selected elements translate in the direction from N1 to N2 by N2-N1 units. 3. Notice the thick, black border around the translate + button. It indicates this is a rapid menu button; you can click the middle mouse button rather than click translate +. 4. Click the middle mouse button. The selected elements are translated again by N2-N1 units. 5. Click translate - twice. The selected elements are translated in the negative N1-N2 vector direction and are now in their original position. Step 9: Measure the distance between two nodes. 1. Press the F4 function key to interrupt, but not exit, the Translate panel and go to the Distance panel. The element and node you selected in the Translate panel are currently not visible. However, they are still selected. They will be visible again when you return to the Translate panel. 2. Verify you are in the two nodes sub-panel. Notice N1 is the active selector. 3. Select any node for N1. The entity selector advances to N2. 4. Select a node near N1 for N2. Notice the distance = field value reflects the absolute distance between N1 and N2. 5. Click in the distance = field to highlight the value. 6. Press CTRL+C to copy the value. 7. Click return to return to the Translate panel. 8. Notice the elements and nodes you selected in the Translate panel before you went to the Distance panel are once again visible. Step 10: Specify a distance to translate the selected elements and then translate them. 1. Toggle from magnitude = N1-N2 to magnitude =. 2. Click in the magnitude = field to highlight its value. 3. Press CTRL+V to paste the distance = value copied from the distance panel. 4. Click translate +. The selected elements translate in the direction from N1 to N2 by the number of units specified for magnitude =. 5. Click translate – once. The selected elements are translated in the negative N1-N2 vector direction and are now in their original position. Step 11: Calculate 5.5 * 10.5 and specify the resulting value for magnitude =. 1. Right click in the magnitude = field. 2. Click 5 . 5 (in that order) and then click enter. 3. Click 10 . 5 (in that order). 4. Click X. The calculated value in the calculator window is 57.75. 5. Click exit. The calculator closes and 57.75 appears in the magnitude = field. You can type a value in the magnitude = field by clicking in the field once to highlight the current value. Then type a new value. Step 12: Specify a new vector and translate the elements again. 1. Click the reset icon ( ) for the direction selector. 2. Notice N1 is the active selector. 3. Select three nodes for N1, N2, N3 to define a plane. 4. Click translate + or press the middle mouse button. The elements are translated 57.75 units in the positive direction normal to the defined plane. 5. Click return to exit the panel. Step 13 (Optional): Save your work. With all of the exercise complete, you can save the model if desired.