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Customer Perception of Road Induced Structural Feel

General Motors LLC-Mark Stebbins, John Cafeo, Mark Beltramo
  • Technical Paper
  • 2020-01-1080
To be published on 2020-04-14 by SAE International in United States
A vehicle program’s timing and viability can be affected by subjective assessments made by engineering teams predicting customer perceptions of many different attributes. In this paper we explore the relationship of those assessments to match customer perceptions for the attribute of structural feel. The eventual goal of work like this is to develop an objective metric that could be used by the product development organization. The first step in developing a metric is to assess whether road induced structural feel can be sensed by the customer. An internal drive clinic was an effective approach for obtaining customer perception of structural feel. Vehicles which spanned excellent structural feel to poor structural feel were chosen as part of the experimental design. The participants, which comprised three groups (panelists, experts, and executives) were able to rank order the vehicles’ structural feel performance essentially the same and in the order determined a priori. This clinic study indicates that structural feel is strongly related to vehicle ride. Experts are good predictors of both panelists and executive responses. Results from objective…
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A New Approach to Comprehensive Modeling of Sheet Metal Tensile Test Data Using a Universal Exponential Expression

University of Colorado Denver-Luis Sanchez Vega
  • Technical Paper
  • 2020-01-0751
To be published on 2020-04-14 by SAE International in United States
This work aims to providing an improved fit to continuously describe tensile test behavior over arbitrary quasi-static regression fit techniques. The tensile test, commonly defined by elastic, transient, and exponential regions, is represented here by a continuous curve spanning from the unstrained state to the post uniform regions. Since the model is continuous, proportionality and yield points between regions are not defined. This continuous behavior is described by an exponential expression defined in the logarithmic stress-strain coordinate system, from which the model fit is determined. In this logarithmic scale, we found that the data is bound by segments of concave and/or convex curvatures which end approach asymptotically towards straight lines. The coordinates of the fit in the logarithmic scale are defined at the intersection of the asymptotes, and the material fits are found from the optimum regression fit. The accuracy of the fit was validated at quasi-static speeds for four different sheet materials: cold rolled deep drawing quality, dual phase DP590, and dual phase DP780 steels, and an aluminum alloy AA6916. The fitting accuracies improved…
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Fitting, Tee, Standard and Reducer, Bulkhead on Run, Flared

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1033G
  • Current
Published 2020-04-01 by SAE International in United States

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Fitting, Tee, Standard and Reducer, Flared

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1035G
  • Current
Published 2020-04-01 by SAE International in United States

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Fitting, Elbow, 90°, Standard and Reducer, Flared

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1034G
  • Current
Published 2020-04-01 by SAE International in United States

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Fitting, Cross, Standard and Reducer, Flared

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1036J
  • Current
Published 2020-04-01 by SAE International in United States

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FITTING, BOLT, FLARED, 37° SPHERICAL

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS6075B
  • Current
Published 2020-03-26 by SAE International in United States

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Coupling Assembly, V-Retainer, High Pressure High Temperature, Pneumatic Tube

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1895E
  • Current
Published 2020-03-19 by SAE International in United States
This SAE Aerospace Standard establishes the requirements for a V-retainer coupling, flanges, and seal suitable for joining high pressure and high temperature ducting in aircraft bleed air systems. The rigid coupling joint assembly, hereafter referred to as “the joint,” shall operate within the temperature range of -65 to +1200 °F.
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Aerospace Size Standard for O-Rings

A-6C2 Seals Committee
  • Aerospace Standard
  • AS568E
  • Current
Published 2020-03-02 by SAE International in United States
This SAE Aerospace Standard (AS) specifies the inside diameters, cross-sections, tolerances, and size identification codes (dash numbers) for O-rings used in sealing applications and for straight thread tube fitting boss gaskets. The dimensions and tolerances specified in this standard are suitable for any elastomeric material provided that suitable tooling is available.
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Annotation ability available
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Spring Drive Fitting

  • Magazine Article
  • TBMG-36183
Published 2020-03-01 by Tech Briefs Media Group in United States

Valve and tube manufacturers continue to battle the problem of fitting pipes and tubing together quickly and reliably. The spring drive fitting addresses this challenge, bridging the gap between solutions for small-diameter tube fittings commonly seen in high-pressure, low-flow-area pneumatic systems and solutions for large flanges used in low-pressure, high-flow-area hydraulic systems.