Refine Your Search

Topic

Author

Affiliation

Search Results

Technical Paper

Determination of Interior NVH Levels from Tire/Wheel Variations using a Monte Carlo Process

2011-05-17
2011-01-1580
Variability in design (e.g. tolerance), material, manufacturing, or other sources of variation causes significant variation in vehicle noise, vibration and harshness (NVH) response. This leads to a higher percentage of produced vehicles with higher levels of NVH leading to higher number of warranty claims and loss of customer satisfaction, which are proven costly to the original equipment manufacturers (OEM). Measures must be taken to insure less warranty claims and higher levels of customer satisfaction. As a result, original equipment manufacturers have implemented design for variation in the design process to secure an acceptable (or within specification) response. We will focus on some aspects of design variations in a tire/wheel assembly that should be considered in the design process. In particular, certain materials (e.g. rubber) are known to have variation in stiffness that is either unavoidable or proven costly if tighter control is desired.
Journal Article

Vehicle Design for Robust Driveline NVH Due to Imbalance and Runout Using a Monte Carlo Process

2011-05-17
2011-01-1546
Variation in vehicle noise, vibration and harshness (NVH) response can be caused by variability in design (e.g. tolerance), material, manufacturing, or other sources of variation. Such variation in the vehicle response causes a higher percentage of produced vehicles with higher levels (out of specifications) of NVH leading to higher number of warranty claims and loss of customer satisfaction, which are proven costly. Measures must be taken to ensure less warranty claims and higher levels of customer satisfaction. As a result, original equipment manufacturers have implemented design for variation in the design process to secure an acceptable (or within specification) response. This paper focuses on aspects of design variations that should be considered in the design process of drivelines. Variations due to imbalance and runout in rotating components can be unavoidable or costly to control.
Technical Paper

The Role of the Highway Environment in Accident Reconstruction

1985-02-25
850095
The highway environment is an integral part of highway safety from the standpoints of collision causation and severity-increasing factors. Highway designers are faced with the problem of providing highway safety without sufficient information about the compatibility of current design standards with either driver or vehicle factors. Collision data collection efforts have not provided specific roadway performance data. Thus, many designs have been based on intuitive ideas rather than on specific performance information. The manufacturers of the rapidly changing vehicle fleet currently do not either provide input to the highway designer or consider vehicle-roadside appurtance interaction during the vehicle design process. This has led to the less than desired performance of some roadway and roadside design features. This paper identifies the problems faced by the roadway designer, and gives suggestions for solving these problems with real-world roadway performance data.
Technical Paper

Accident Reconstruction with Data Recorded by Electronic Control Units in Vehicles with a Pre-crash Safety System

2018-04-03
2018-01-1440
Data recorded by vehicle-mounted electronic control units (ECUs) are highly useful in traffic accident reconstruction. In this context, event data recorders (EDRs) are airbag ECU components used to log information from crash events, typically providing data on speed, accelerator operation, RPMs and brake lamp activation for a period of around 5 s before a collision. ...Thus, it is important to check the accuracy of EDR speed data in accident reconstruction. Meanwhile, pre-crash safety systems (PCSs) are also becoming more widespread in automobile usage today. ...Such systems automatically apply braking in hazardous situations, and the relevant data recorded in the ECU are promising in the field of accident reconstruction. This study involved physical tests in the form of simulated rear-end collisions and the collection of recorded PCS data at the post-test stage.
Technical Paper

Use of Computerized Accident Repair Statistics in Designing for Improved Damageability

1984-02-01
840321
The proliferation of make/model insurance premium rating programs has encouraged auto manufacturers to design new models for reduced accident damage susceptibility and improved repairability. Computerized collision repair estimating has facilitated damageability analysis by providing “real world” accident statistics to evaluate current vehicle designs. ...Computerized collision repair estimating has facilitated damageability analysis by providing “real world” accident statistics to evaluate current vehicle designs. Such information is useful in developing design “do's and don'ts” for future models, determining the competitive position of a manufacturer's products or parts pricing levels, establishing damageability objectives for future models and projecting status as the design evolves, determining the effects of downsizing or new materials and correlating damageability crash testing to field experience.
Technical Paper

Mechatronics Based Accident Alarming System with Automatic Roadblock Prevention System

2017-03-28
2017-01-1728
In any unlikely event of accidents or vehicle breakdown, there is accumulation of traffic which results in road-blockage and causes in convenience to other vehicles. ...If this happens in remote areas, the accidents victims are left unattended and there is delay in providing emergency services. In case of traffic, it obstructs the entry of ambulance and rescue team which results in death of passengers. ...To prevent this mishap, a mechatronics based road block avoidance and accident alarming system is designed which is automated by the use of sensors. The road-block is detected with the help sensors located at regular intervals on road.
Technical Paper

Designing a Specified Reliability Directly into a Component

1964-01-01
640615
Probabilistic methods of calculating the reliability of components from their stress and strength distributions is developed and illustrated. Monte Carlo techniques of determining stress and strength distributions, given the distributions of the parameters affecting them are presented.
Technical Paper

Thermal Radiation Analysis on Automotive Lamp Using CFD and Ray Tracing Method

2017-03-28
2017-01-1737
Then, the accuracy and computational cost of the method were compared with thermal results obtained by a thermal radiation model using Monte Carlo (MC) technique for calculating radiation effect coupled with CFD in heat transfer analysis. ...According to the study results, the Monte Carlo method can give a more accurate thermal analysis results for a license plate lamp, whereas the two-day faster ray tracing mapping analysis can also give a similar tendency of temperature distribution on the lamp as well.
Technical Paper

An Excel Based Robust Design Tool for Vehicle Structural Optimization

2004-03-08
2004-01-1124
The RBDO process starts from running simulation at DOE sampling data points, generating surrogate models (response surface) and performing robust and reliability based design optimization on the surrogate models by using Monte Carlo simulation. This paper presents a RBDO framework in Excel enviroment. Within this framework, the engineer can perform DOE sampling, surrogate modeling, robustness assessment, Monte Carlo simulation, robust design and reliability-based optimization with any type of distribution. ...Within this framework, the engineer can perform DOE sampling, surrogate modeling, robustness assessment, Monte Carlo simulation, robust design and reliability-based optimization with any type of distribution.
Journal Article

Fatigue Evaluation of Multi-Degree of Freedom, Frequency Domain, Stochastic, Truck Road Load Models

2019-02-11
The stochastic models are divided into two groups: Monte Carlo based and models based on single spectrum matrices. In both cases, the objective is to provide a load model that may be used to produce a design with a certain probability of survival. ...Model parameters investigated included spectrum formulation (averaged vs damage equivalent spectra), polar vs rectangular formulation, and the effect of sorting of outcomes in the Monte Carlo models. For semi-deterministic load models, damage equivalent formulations performed well independent of number of load degrees of freedom, while averaged spectra here consistently under estimated the damage.
Technical Paper

A Probabilistic Approach to Multivariate Constrained Robust Design Simulation

1997-10-01
975508
The approach previously proposed by the authors, linking Response Surface Methodology with Monte Carlo Simulations, has revealed itself to be cumbersome and at times impractical for multi-constraint, multi-objective problems. ...The paper critically reviews the combined Response Surface Equation/ Monte Carlo Simulation methodology and compares it against the Advanced Mean Value (AMV) method, one of several Fast Probability Integration techniques. ...The Advanced Mean Value method shows significant time savings over the Response Surface Equation/Monte Carlo Simulation method, and generally yields more accurate CDF distributions. The paper also illustrates how by using the AMV method for distribution generation, robust design solutions to multivariate constrained problems may be obtained.
Journal Article

Robust Analysis and Optimization Design of Double Front Axle Steering System

2014-05-20
2013-01-9124
This paper proposes a robust optimization design method for a double front axle steering system (DFASS) of heavy trucks based on Monte Carlo method. The DFASS consists of two trapezoidal steering mechanisms (TSM) and one rocker system, and the optimization objectives of DFASS include the minimum mean value and variance of the maximum turning angle error of the TSM and rocker system.
X