FFlex Thermal 글 편집

Overview

• RecurDyn FFlex is possible to consider the thermal stress and thermal expansion due to a temperature change within a flexible body.
• Boundary conditions can also be set to include additional heat transfer effects such as Convection, Heat Generation, or Heat Flux.
• Supported elements
  
  • Beam2
  • Shell3, Shell4, Shell9
  • Solid4, Solid5, Solid6, Solid8, Solid10, Solid26

Features

1. Material Properties

• Thermal Characteristics: The temperature properties for material can be specified in the material Properties window. (Elastic/Isotropic only)
  • Thermal Coefficient (Coefficient of thermal expansion)
  • Reference Temperature (Temperature at which no thermal stress occurs in the material or initial temperature in RecurDyn)
  • Specific Heat
  • Thermal Conductivity

2. Thermal Conductivity Analysis

• Nodal Temperature: Defines the temperature condition by entering an Expression for a Node Set.
• Heat Flux: Defines the amount of heat influx per unit area by entering an Expression for a Patch Set. The area inflow direction can be set to either Up or Down.
• Convection: It is now possible to select a Patch Set and enter a Heat Coefficient and Ambient Air Temperature to define the amount of surface heat transfer by convection.
• Heat Generation: Defines the energy generated per unit volume by entering an Expression for an Element Set.

3. Thermal Load

• RTL Generation: It is now possible to generate RTL files in CSV file format from the thermal conductivity analysis results of flexible bodies.
• Thermal Load
  • To calculate the thermal load, the temperature of each node is defined using Expression.
  • Analysis considering the converted thermal load is possible.
  • Applying the RTL file to the thermal load allows an analysis to consider the thermal load without performing a heat transfer analysis.

Benefits

• RecurDyn can perform thermal conductivity analysis without using any other software.
• This allows you to check the effects of thermal expansion and thermal stress of a flexible body when performing multi flexible body dynamics analysis.
• It is now possible to perform dynamic analysis in consideration of thermal stress on the structure and parts of a system that generates a lot of thermal energy and to improve the design for system operation with reliability and stability.

Examples

Example 1. Cooling of Steel Rod

• Analysis Conditions: Cooling by convection from initial temperature 200°C to 30°C

Example 2.Hollow Cylinder with Fixed Temperature & Convection

• Analysis Conditions: Temperature rise due to convection inside cylinder and fixed external temperature condition
  

Application

Bimetal Thermometer (Helical Type)

• Bimetal Thermometer (Helical Type)
  • The helix is fixed on one end and the other end will twist or rotate directly proportional to the temperature change
  • A calibrated gauge with indicator is attached to the rotating end for direct indication of the sensed temperature
• RecurDyn Modeling
  • Plate Top: Thermal insulation (Steel)
  • Plate Bottom: Thermal insulation (Brass)
  • Left end: Convection
  • Right end: Heat Generation