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Measurement of the Biodynamic Response of the Hand-Arm System and Study of its Influence on the Vibrational Response of the Steering Wheel

INSA Lyon-Etienne Parizet
PSA Group, INSA Lyon-luc laroche
  • Technical Paper
  • 2020-01-1548
To be published on 2020-06-03 by SAE International in United States
Driver’s hands modify the vibrational response of the steering wheel, so that car manufacturers are used to measure vibrations of the free steering wheel to ensure reproducibility. However, levels measured in this condition do not represent those perceived by the driver. The aim of this study is to predict the vibrational response of the hand-wheel coupled system from measurements of the non-held steering wheel, and of the mechanical impedance of the arm. The mechanical impedance of the hand-arm system is measured at three levels of vibration (0.5 2.5 and 5 m/s²) in two directions of excitation (along the arm and in the normal direction of the palm). The position of the arm and the hand grip are controlled to be as close as possible to a driving situation. For each condition, the mechanical impedance is calculated and compared to models of ISO 10068. The differences introduced between the response of the left and right hand are also investigated according to the preferred hand and anthropometric data. In a second step, a measurement of the vibrational…
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Seat Design Studies

Kettering University-Santhosh Sivan Kathiresan, Raghu Echempati
  • Technical Paper
  • 2020-01-1101
To be published on 2020-04-14 by SAE International in United States
In this paper, further studies have been carried out on the analysis and effect of certain design modifications on the structural integrity of an automotive seating rail structure. Automotive seating is one of the important component in the automotive industry due to their main function to carry the weight of passenger as well as to sustain the vibrations from the road. The seat structures are assembled to carry other important components such as side airbag and seatbelt systems. The entire seating is supported firmly and attached to the bottom bodywork of the vehicle through the linkage assembly called the seat rails. Seat rails are adjustable in their longitudinal motion which plays an important role in giving the passengers enough leg room to make them feel comfortable. Therefore, seat rails under the various operating conditions such as forward and normal positions should be able to withstand the complete weight of the human and the associated loads due to vibrations. In this paper, some of the functional requirements such as strength, stiffness, durability and crash performance are…
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Overcoming operational blindness in Software Architecture

Invensity GmbH-Nils Berger
  • Technical Paper
  • 2020-01-1336
To be published on 2020-04-14 by SAE International in United States
A lesson learned on why software architects fall short of expectations and how to fix it by setting the scope. Detailing the design that is already clear in the head comes natural to an architects. Afterall most architects are basically just aged developers. Consequently, this haste and even excitement about the technical challenge prevent them from being effective. Being an architect is - to great bits - about software instinct which grows out of development practice. This paper is about the two small parts which make a developer become an architect: Discipline and Scope. The proposed technical paper covers the challenges as well as the lessons learned in the development of an embedded automotive software architecture. Based on the experience from different embedded application the following structure will be followed: Part 1: Where to start with a new design This is the main questions asked by new software architects. A good design starts with a clear value proposition. What is the goal and scope of the architectural design? Different answers are discussed and a good…
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Bicycle Braking Performance Testing and Analysis

Momentum Engineering Corp.-Nicholas Famiglietti, Benjamin Nguyen, Edward Fatzinger, Jon Landerville
  • Technical Paper
  • 2020-01-0876
To be published on 2020-04-14 by SAE International in United States
The goal of this study was to determine the braking capabilities of different bicycle types, with different brake setups and applications. A variety of bicycles, including a mountain bike, beach cruiser, BMX bike, road bike, and commuter bike were used to perform brake-to-stop tests. Prior to brake testing, the bicycles were fully inspected, prepped, and documented. Details of the bicycles’ make, model, tires, wheels, brake setup, suspension setup, and preexisting damage were photographed and recorded. The standardized brake testing procedure consisted of rear only brake application and both front and rear brake application. In order to maintain brake application consistency, a single rider performed all series of the skid/brake tests at the same location, on dry asphalt. The tests were performed at an initial velocity of 9 – 20 mph. For each test, the rider accelerated to the test speed and applied maximum braking effort while maintaining a natural upright position to reduce lean. The tests were performed on a painted grid for visibility purposed in measuring skid lengths and post-test video analysis. The bicycle…
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High Speed Autonomous Vehicle Modeling and Construction

University of California, Irvine-Joseph Bell, Vatche Donikian, Gregory Washington
  • Technical Paper
  • 2020-01-0711
To be published on 2020-04-14 by SAE International in United States
Drag racing is one of the fastest accelerating automotive sports on the planet. Specially designed vehicles compete from a standstill to their maximum acceleration in a straight line for a predetermined length. This work seeks to develop a vehicle model for a competition eliminator dragster which is a specialized vehicle built to compete in the National Hot Rod Association (NHRA). A simple control strategy was also developed once the vehicle model was validated. Redundant braking, steering, throttle and shifting systems were all redesigned, modeled, and then implemented in vehicle. Three key sensors (camera, radar, lidar) were also integrated on to the vehicle to enable the vehicle to know its position relative to the track. All these systems were developed and designed such that the vehicle could be autonomously driven yet enable a safe hand off for manual operation as well.
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A Methodology to Enhance the Directional Load Bearing Performance of Cowl Cover and its Effect on Pedestrian Head Impact

Maruti Suzuki India Ltd.-Aaradhana Agarwal, Chandra Sekhar S
Maruti Suzuki India, Ltd.-Nikhil Jayanth
  • Technical Paper
  • 2020-01-0911
To be published on 2020-04-14 by SAE International in United States
In the modern automobile scenario in developing countries, the customers are getting more meticulous and the market more competitive. Now even the budget vehicle customer expects desirable vehicle performance in specific use cases of the vehicle that were previously not focused by designers. Hence, the focus on perceived quality challenges automobile engineers to go the extra mile when it comes to the cost-effective design of parts that are tangible to the customer. A vehicle's cowl cover is one such exterior component. The primary functions of this part are to provide air intake opening for the HVAC system and cover the components like wiper motor. The aesthetic function is to cover the gaps between windshield, hood, and fender as seamlessly as possible. A specific role of cowl cover, which calls for a designer's attention, is its load-bearing capability. This component has to be stiff enough to bear external loads like snow accumulation or application of hand on the part by customer or service personnel. Simultaneously, it plays a significant role in absorbing the energy of a…

Augmented Reality System Lets Smartphone Users Interact with Virtual Objects

  • Magazine Article
  • TBMG-35959
Published 2020-02-01 by Tech Briefs Media Group in United States

A new software system turns cellphones into augmented reality portals, enabling users to place virtual building blocks, furniture, and other objects into real-world backdrops and use their hands to manipulate those objects as if they were really there. The system, called Portal-ble, could be a tool to experiment with augmented reality (AR).

Dynamic Gripper Mimics Adjustable Grip of the Human Hand

  • Magazine Article
  • TBMG-35995
Published 2020-02-01 by Tech Briefs Media Group in United States

Human hands can alter the firmness of their grip. A new two-fingered robotic hand shares that trait. The design enables it to absorb energy from impacts during collisions, preventing whatever the robot is holding from breaking and making it safer for people to work with and near the machines.

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CRIMPING TOOL, TYPE 2, TERMINAL, HAND, WIRE TERMINATION FOR SIZE 16 SHIELDED CONTACTS (OUTER CONTACT)

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS22520/19A
  • Current
Published 2019-12-09 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available
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CRIMPING TOOL, TYPE 2, TERMINAL, HAND, WIRE TERMINATION FOR SIZE 12 SHIELDED CONTACTS (OUTER CONTACT)

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS22520/21A
  • Current
Published 2019-12-09 by SAE International in United States
No Abstract Available.
This content contains downloadable datasets
Annotation ability available