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Vehicle rollover prevention by active tilt control using active suspension with MPC

Clemson University-Yunyi Jia, Longxiang Guo
Nanjing Forestry University, Clemson University-Jialing Yao
  • Technical Paper
  • 2020-01-0998
To be published on 2020-04-14 by SAE International in United States
The active suspension can be used to control the lateral load transfer directly, however, existing approaches for rollover prevention with an active suspension have some limitations in preventing rollovers because these controls mostly focus on reducing the roll angle passively or causing zero roll angle at most. This project presents a methodology for rollover prevention to control an automobile to tilt toward the turning direction by using active suspension. This reverse tilt can cause the moment generated by gravity to offset that generated by the centrifugal force, and therefore reduce the lateral load transfer rate (LTR). As a result, this tilt control can effectively improve the ability of vehicle on rollover prevention. A 3-DOF vehicle model with a 2-DOF bicycle and a 1-DOF roll model is established. The desired tilt angle is determined by dynamic analysis. Considering the constraint problems such as tilt angle, vehicle slip angle, yaw rate and suspension control moment, the model predictive control theory is used to design the active tilt controller, which causes zero steady-state tilt angle error. Two severe…
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Methodology using IPS for creation and installation of flexible components in stationary vehicles

General Motors, do Brasil-André Tognolli, Fernando Utiyke, Douglas Migliorini
  • Technical Paper
  • 2019-36-0125
Published 2020-01-13 by SAE International in United States
Through dynamic computational simulations it is possible to achieve a high reliability index in the development of automotive components, thus reducing the time and cost of the component can generate considerable levels of competitiveness and quality.This work suggests the validation of a methodology to create the virtual routes to find the best design of the flexible components influenced by force of gravity, thermal expansion or even the static balance between the anchor points and used to be designed and installed in the vehicle always in the nominal condition which in many cases diverge from the physical.With the difficulty of predicting mathematically the nonlinear relations of deformation and motion under the effect of forces and moments, we use the NX9 software in the creation of the dynamic movement motion to the motor and transmission assembly imposes on the flexible components through a routine mapped by Cartesian coordinates, simulating the characteristic movements of the vehicle in normal working situations.Using the software IPS - Industrial Path Solution, for the construction of the flexible model to be simulated, the…
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Passenger Car Side Door Latch Systems

Motor Vehicle Council
  • Ground Vehicle Standard
  • J839_201910
  • Current
Published 2019-10-09 by SAE International in United States
This SAE Recommended Practice establishes minimum performance requirements and test procedures for evaluating and testing passenger car side door latch systems. It is limited to tests that can be conducted on uniform test fixtures and equipment in commercially available laboratory test facilities. The test procedures and minimum performance requirements outlined in this document are based on currently available engineering data. It is intended that all portions of the document will be periodically reviewed and revised, as additional knowledge regarding vehicle latch performance under impact conditions is developed.
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Measuring Stickiness of Microscale Surfaces

  • Magazine Article
  • TBMG-35124
Published 2019-09-01 by Tech Briefs Media Group in United States

At the scale of bridges or buildings, the most important force that engineered structures need to deal with is gravity. But at the scale of microelectro-mechanical systems (MEMS) — devices like the tiny accelerometers used in smartphones — the relative importance of gravity decreases and adhesive forces become more important.

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Effect of Using Exhaust Gas Recirculation (EGR) on the Emission Characteristics of the CI Engine Fuelled by Acetone-Butanol-Ethanol (ABE) Diesel Blends

CASRAE, Delhi Technological University-Aahan Malhotra, Mukesh Yadav, Mukul Tomar, Shikhar Jain
Delhi Technological University-Naveen Kumar
Published 2019-04-02 by SAE International in United States
The power generation, agriculture, and transportation sectors are dominated by diesel engines due to better thermal efficiency and durability. Diesel engines are also a major contributor to the air pollutants such as NOx and particulate matter. Acetone-butanol-ethanol (ABE) is considered a promising alternative fuel as it emits less pollutants compared to conventional fuels. In current work, the ABE used was of the ratio (3:6:1) and four samples were prepared for engine trial ABE (10%90%diesel), ABE (20%80%diesel), ABE (30%70%diesel) and ABE (40%60%diesel). Their physio-chemical properties like kinematic viscosity, density, specific gravity and calorific value were checked and tested on compression ignition engine at different operating parameters. The experimental work was conducted upon Kirloskar 4-stroke single cylinder, vertical, air-cooled 661cc compression ignition engine at different speeds and loads. The operational parameters taken were injection temperature, injection pressure and injection timings. The main aim of the current work is to find the effect of exhaust gas recirculation (EGR) on the emission characteristics of acetone-butanol-ethanol (ABE) blends with diesel in compressed ignition engine. Exhaust gas recirculation (EGR) is a…
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Standard Oil Filter Test Oil

Filter Test Methods Standards Committee
  • Ground Vehicle Standard
  • J1260_201901
  • Current
Published 2019-01-16 by SAE International in United States
This SAE Standard defines the requirements for an oil to be used in the SAE HS 806 Oil Filter Test Procedures.
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Space Debris Orbit and Attitude Prediction for Enhanced and Efficient Space Situational Awareness

  • Magazine Article
  • TBMG-33025
Published 2018-10-01 by Tech Briefs Media Group in United States

This research deals with the problem of modelling the orbit and attitude motion of uncontrolled manmade objects in orbit about the Earth, which tumble due to the natural influences of the near-Earth space environment. A mathematical, physics-based and computational approach is taken to model the forces and torques that drive the orbit and attitude evolution of such objects. The main influence modelled is solar radiation pressure (SRP), which is the interaction of solar electromagnetic radiation with the surface of an object, leading to both forces and torques that influence the orbital and attitude motion. Other influences, such as the gravitational field of the Earth, are also modelled.

Active Response Gravity Offload System

  • Magazine Article
  • TBMG-29696
Published 2018-07-01 by Tech Briefs Media Group in United States

NASA has used two systems to train astronauts for weightlessness. The first is the Reduced Gravity Simulator that suspended the astronaut at an angle of 80.5 so that only 1/6th of his or her weight was supported by the ground, while the rest was supported by a pulley system. The other system, designed during the Apollo era, is the Partial Gravity Simulator (POGO), which uses an air-controlled piston along with air bearings and gimbals to simulate reduced gravity. This pneumatic system is attached to an air-bearing rail to allow for maneuverability in two dimensions. POGO was used to train astronauts on how to use tools and other hardware in microgravity.

All-in-One Lab Device Gets New Instruments via Software Update

  • Magazine Article
  • TBMG-28838
Published 2018-05-01 by Tech Briefs Media Group in United States

Spinoff is NASA’s annual publication featuring successfully commercialized NASA technology. This commercialization has contributed to the development of products and services in the fields of health and medicine, consumer goods, transportation, public safety, computer technology, and environmental resources.

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Reusable Lock for Spanner Nuts

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • ARP688B
  • Current
Published 2018-04-28 by SAE International in United States
This aerospace recommended practice is applicable to the design of a reusable locking device for cylindrical nuts which are generally tightened with a spanner wrench. Nuts of this type are commonly used to pre-load, and/or position, anti-friction bearings.
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