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Drive Simulation with Speed and Heading
This model was created to demonstrate the built-in Diesel Engine Model in RadTherm/MuSES Version 7.0. The engine model can be “driven” using a vehicle speed input curve. The convective effects determined by RadTherm’s wind model can also use the speed curve and vehicle heading curve to determine an apparent wind vector. This model included a natural environment with solar loads and apparent wind effects.
The geometry was meshed and assigned to parts for the body, engine, radiator, axles, wheels, tires, frame, exhaust system and trailer. The trailer included an air node and a lumped capacitance node to represent cargo thermal mass.
Complete Environments
RadTherm offers a complete external environment. Our terrain model incorporates the full effects of solar shadowing, multiple reflections, and reradiation of geometric features (e.g. radiation exchange between vehicle exhaust systems and asphalt road surfaces). For validation data, click the “Support” tab on our website.
Built-in Diesel Engine Model
The engine model setup interface is shown below. Engine specifications were based on International T44E parameters. Engine geometry was sized to approximately match the T44E block.
Test Thermal Design Value
Quickly demonstrate improved thermal comfort and safety around heat sources: the model above was constructed and solved by a novice RadTherm user in a few hours. For a complete report on this model and a free download of the model file, visit www.thermoanalytics.com/applications
If your team needs immediate results, ThermoAnalytics offers contractual modeling and consulting services. We can quickly deliver contract models and/or analysis.
RadTherm's Built-in
Diesel Engine Model
Sample Model: Diesel Truck
Using RadTherm's Built-in Diesel Engine Model
ThermoAnalytics, Inc. P.O. Box 66, Calumet, MI 49913 USA Tel: 800.214.3766 (USA) or 906.482.9560 www.ThermoAnalytics.com info@ThermoAnalytics.com
Meaningful Results
Compare the results curves below to the main input parameter, the vehicle speed curve. The power of this type of modeling in RadTherm is that speed and heading curves can be generated for specific driving schedules and heat management techniques can be tested under a range of operating conditions.
Free Download of this Model
This model is available for download from our website. Visit www.thermoanalytics.com/applications/
You can animate, plot, and view setup in the demo version of RadTherm, WinTherm or ViewTherm.
Engine Model Outputs
Engine power can be directly specified or determined from the speed input curve and a transmission map. Based on the required engine power, the Engine Model determines the following outputs:
• Engine Block Surface Temperature
• Engine Cooling Air Fluid Node
• Exhaust Gas Flow Rate
• Exhaust Gas Fluid Temperature
The exhaust system was modeled in 7 sections, using fluid nodes with advection links through the system. Each side of the exhaust system received 50% of the total exhaust gas flow. The fluid temperature was the Exhaust Gas Fluid Temperature determined by the Diesel Engine Model.
Speed Input Curve
The speed curve is a major determinant to the thermal behavior of the entire vehicle.
