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wiki:sns:sns2014:surface_loads [2017/07/13 10:10] – clairewiki:sns:sns2014:surface_loads [2023/12/13 13:48] (current) – [Related Tutorial Videos] michael
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 +~~CLOSETOC~~
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 ====== Surface Loads ====== ====== Surface Loads ======
  
-Scan&Solve™ currently supports 4 types of surface loads: Vector Force, Scalar Force, Pressure, and Torque. For convenience vector and pressure loads may be specified in more than one way. Surface loads are applied to faces selected after clicking the [Add] (load) button in the Specify tab. If only a portion of a face needs to be loaded, please refer to the documentation on [[partial|Restraining Partial Faces]]. The procedure detailed there can be used to divide a face into separate parts for loading as well as restraining.+Scan&Solve™ currently supports 4 types of surface loads: Vector Force, Scalar Force, Pressure, and Torque. For convenience vector and pressure loads may be specified in more than one way. Surface loads are applied to faces selected after clicking the [Add] (load) button in the Specify tab. If only a portion of a face needs to be loaded, please refer to the documentation on [[wiki:sns:sns2014:restraining_partial_faces_and_edges|Restraining Partial Faces]]. The procedure detailed there can be used to divide a face into separate parts for loading as well as restraining.
  
 {{ :wiki:sns:sns2014:sl1.png?600 |}} {{ :wiki:sns:sns2014:sl1.png?600 |}}
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 **NOTICE:** Loads are associated with solid faces by the order the faces are represented in Rhino. Consequently, any modifications to the geometry (e.g. Boolean operations) that affect the ordering of the faces may result in loads being moved to new faces or lost altogether. Check the location of your loads carefully if you modify the geometry between analysis runs. **NOTICE:** Loads are associated with solid faces by the order the faces are represented in Rhino. Consequently, any modifications to the geometry (e.g. Boolean operations) that affect the ordering of the faces may result in loads being moved to new faces or lost altogether. Check the location of your loads carefully if you modify the geometry between analysis runs.
  
-===== Per Face Option =====+==== Per Face Option ====
  
 The "Per Face" option is available when specifying Vector and Scalar forces. Selecting this option means that the force is duplicated on each face in the set of selected faces. Otherwise, the specified magnitude of the force is distributed among the selected faces in direct proportion to their areas. The "Per Face" option is available when specifying Vector and Scalar forces. Selecting this option means that the force is duplicated on each face in the set of selected faces. Otherwise, the specified magnitude of the force is distributed among the selected faces in direct proportion to their areas.
  
-===== Unit Systems =====+==== Unit Systems ====
  
 The "Unit Sytem" menu is used to switch between different unit configurations when specifying magnitudes. There are several options available for both metric and U.S. units. The "Unit Sytem" menu is used to switch between different unit configurations when specifying magnitudes. There are several options available for both metric and U.S. units.
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 ===== Vector Force ===== ===== Vector Force =====
  
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 {{ :wiki:sns:sns2014:sl4.png?400 |}} {{ :wiki:sns:sns2014:sl4.png?400 |}}
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 ===== Scalar Force ===== ===== Scalar Force =====
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 ===== Pressure ===== ===== Pressure =====
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 ===== Pressure Expression ===== ===== Pressure Expression =====
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 A "Pressure Expression" load is a type of pressure load that can vary according to a mathematical expression written in terms of the world coordinates x, y, and z. During the solution process, Scan&Solve™ evaluates the expression over the selected faces, applying the result as a pressure in the unit system specified for the load. The spatial coordinates used in the expression carry the length units in use by the Rhino document irrespective of the units used to specify the load. A "Pressure Expression" load is a type of pressure load that can vary according to a mathematical expression written in terms of the world coordinates x, y, and z. During the solution process, Scan&Solve™ evaluates the expression over the selected faces, applying the result as a pressure in the unit system specified for the load. The spatial coordinates used in the expression carry the length units in use by the Rhino document irrespective of the units used to specify the load.
  
-{{images:pressure_expression_dialog.png}}{{images:pressure_expression_load.png}}=== Variables and Constants ===+<WRAP group> 
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 +==== Variables and Constants ====
  
 Expressions in Scan&Solve™ may contain the following variables and pre-defined constants. Expressions in Scan&Solve™ may contain the following variables and pre-defined constants.
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 |''heaviside(expr)''|0 for ''expr'' < 0, 1 for ''expr'' ≥ 0| |''heaviside(expr)''|0 for ''expr'' < 0, 1 for ''expr'' ≥ 0|
 |''sign(expr)''|1 for ''expr'' > 0, 0 for ''expr''=0, 1 for ''expr'' ≥ 0| |''sign(expr)''|1 for ''expr'' > 0, 0 for ''expr''=0, 1 for ''expr'' ≥ 0|
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 ===== Hydrostatic ===== ===== Hydrostatic =====
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 A "Hydrostatic" load is a spatially varying pressure as experienced by the walls of a pool due to the weight of the water pressing against them. The pressure at any point depends on the density of the water, increasing from a value of zero at the water surface to a maximum at the deepest point. Hydrostatic loads are specified in Scan&Solve™ by specifying an oriented plane for the fluid surface and the density of the fluid in question. The plane's normal indicates the direction of increasing depth. A "Hydrostatic" load is a spatially varying pressure as experienced by the walls of a pool due to the weight of the water pressing against them. The pressure at any point depends on the density of the water, increasing from a value of zero at the water surface to a maximum at the deepest point. Hydrostatic loads are specified in Scan&Solve™ by specifying an oriented plane for the fluid surface and the density of the fluid in question. The plane's normal indicates the direction of increasing depth.
  
-{{images:hydrostatic_load_dialog.png}}{{images:hydrostatic_load.png}}+<WRAP group> 
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 ===== Torque ===== ===== Torque =====
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 A "Torque" load is a load that applies a twisting force around an axis. Torques are specified using a 2 step process. 1: The axis (a ray) is chosen by specifying an origin for the axis followed by a point on the axis (the ray's direction). 2: The magnitude of torque is specified in the entry box. The direction of the torque is determined using the right hand rule: using your right hand, point your thumb in the direction of the axis. A positive torque value applies a torque acting in the direction the fingers of your right hand would wrap around the axis. The torque load is distributed among all the selected faces and varies linearly from zero at the axis. A "Torque" load is a load that applies a twisting force around an axis. Torques are specified using a 2 step process. 1: The axis (a ray) is chosen by specifying an origin for the axis followed by a point on the axis (the ray's direction). 2: The magnitude of torque is specified in the entry box. The direction of the torque is determined using the right hand rule: using your right hand, point your thumb in the direction of the axis. A positive torque value applies a torque acting in the direction the fingers of your right hand would wrap around the axis. The torque load is distributed among all the selected faces and varies linearly from zero at the axis.
  
-{{images:torque_load_dialog.png}}{{images:torque_load.png}}+<WRAP group> 
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 +===== Related Blog Posts ===== 
 +  * [[wiki:sns:sns2014:apply_point_loads|Applying Point Loads]] 
 +  * [[wiki:sns:sns2014:test_pressure_plastic_container|Applying Pressure Loads]] 
 + 
 + 
 +=====Related Tutorial Videos===== 
 +<WRAP half column> 
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 +{{youtube>MNectTGB3IE?large}} 
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 +This short video shows how to apply [[wiki:sns:sns2014:surface_loads#Pressure expression|expression loads]] in Scan&Solve. 
 + 
 +{{youtube>eY83ShUP764?large}} 
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 +Learn how to apply a [[wiki:sns:sns2014:surface_loads#Torque|torque]] in Scan&Solve by watching this video. 
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 +{{youtube>jBlJKbjpcgM?large}} 
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 +Learn how to apply [[wiki:sns:sns2014:surface_loads#Hydrostatic|hydrostatic loads]] in Scan&Solve. 
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wiki/sns/sns2014/surface_loads.1499962236.txt.gz · Last modified: 2017/07/13 10:10 by claire