SIMULIA 리소스 센터

Vehicle OEMs invest significant effort and cost into reducing noise sources to improve the level of passenger comfort. Recent J. D. Power surveys have identified wind noise as a strong influence on consumer perception of vehicle quality. Among the wind noise complaints, vehicle buffeting due to an open sunroof or side window was identified as a significant contributor. Buffeting (also known as wind throb) is an unpleasant, high-amplitude, low-frequency booming caused by flow-excited Helmholtz resonance of the interior cabin.

Solution Briefs

HVAC units and distribution systems are integral parts of the cabin climate control function. To ensure the comfort of the driver and passengers, the right amount of conditioned air at desirable temperature and humidity levels should be delivered to the target locations. Adequate flow delivery is also important for the safe operation of a vehicle that requires proper demist and defrost capabilities.

Solution Briefs

Internal combustion engines in vehicle applications draw fresh air from the surroundings through the air intake system. The design of the air intake system is a critical factor influencing engine performance. One important engineering criterion to evaluate the performance of the air intake system is the Rise over Ambient (RoA) value, which is the magnitude of the air temperature increase at the engine intake port over the ambient condition. Engine manufacturers usually specify an upper design limit for proper engine operation. In addition, a lower RoA value is better for engine performance due to better thermodynamic efficiency. It is a common practice to report an RoA value that is averaged over a predefined vehicle driving cycle.

Solution Briefs

Air is not the only medium encountered by a vehicle on the road. Vehicles must be designed to handle the sometimes harsh natural conditions found on the road, where water, snow, ice, dirt, rocks, and other particles of debris are kicked up off the road by tires or wind, or are present due to weather conditions. The small size of these particles dictates that they will be strongly influenced by vehicle aerodynamics. The exterior airflow around a moving vehicle drives the motion of particles around the vehicle until they hit the surface or are ingested into an air intake or other opening.

Solution Briefs

Adequate cooling airflow through heat exchangers is an essential element of vehicle thermal management. Many other vehicle systems, such as engine cooling, transmission, HVAC, and power steering have significant cooling requirements and their thermal efficiency has a direct impact on the fuel economy, performance, and comfort aspects of a vehicle. The design of a cooling airflow management system should also account for the constraints and design issues related to front-end appearance, as well as the trade-offs with other vehicle performance characteristics (such as aerodynamic performance).

Solution Briefs

Many components in a vehicle can become so hot that they can potentially fail or degrade nearby components, leading to serious safety, durability, and warranty issues. Plastic components are being used increasingly to save on cost and weight, but are more sensitive to temperature. Globalization is leading to vehicles or vehicle platforms that must operate in extremely wide temperature ranges. Careful and detailed analysis of component placement and thermal shielding is required to avoid costly late-stage design fixes or, worse, failures when in production.

Solution Briefs

Thermal Simulation of Avionics Compartments

Solution Briefs

Vehicle electrification is one of today’s main engineering research and development challenges. Despite the technology still being in its infancy, hybrid and electric drive vehicles are here to stay and the battery system is one of the critical components. It must provide sufficient power to give usable daily range, last 10 years or more, be as small and lightweight as possible, yet be safe from fire or the release of hazardous materials. Maintaining the batteries within a strict operating temperature range is essential to meet vehicle range and battery lifetime requirements. Increasing globalization is leading to vehicles or vehicle platforms that must operate in extremely wide operational temperature ranges, which further amplifies the challenge.

Solution Briefs

Noise pollution from vehicles, airplanes, trains, and heavy machinery is steadily increasing — with proven adverse health effects for people in nearby communities. Therefore, government regulations for community noise are getting more stringent in most countries. This creates significant challenges for vehicle and aircraft manufacturers forced to meet these ever increasing regulatory requirements.

Solution Briefs

Noise from aircraft jet engines during take-off is the dominant source of community noise. Government regulations of community noise are getting more and more stringent in most countries, creating significant challenges for aircraft manufacturers forced to meet these ever-increasing regulatory requirements.

Solution Briefs

One of the most noticeable physical phenomena in a vehicle is how quickly the windshield and side windows clear on a cold morning. A mist or ice layer is an obvious safety hazard and every country has regulations specifying the maximum time allowed for defrosting/demisting. It’s no wonder that defrosting and demisting are assessed by the J.D. Power and Associates’ initial quality survey. The speed of the defrosting and demisting depends on many factors, including the detailed design of the HVAC ducts and registers, air temperature, velocity, and turbulence. Optimizing the design of the HVAC system can be a difficult task.

Solution Briefs

Many components in a vehicle can become so hot that they can potentially fail or degrade other nearby components, leading to serious safety, durability, and warranty issues. Plastic components are being used increasingly to save on cost and weight, but are more sensitive to temperature. Globalization is leading to vehicles or vehicle platforms that must operate in extremely wide operational temperature ranges. Careful and detailed analysis of component placement and thermal shielding is required to avoid costly late-stage design fixes or, worse, failures when in production.

Solution Briefs