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Magazine

‘Stumbling Device’ Helps Improve Prosthetic Legs

  • Magazine Article
  • TBMG-34974
Published 2019-08-01 by Tech Briefs Media Group in United States

Researchers are addressing the tendency to stumble in lower-body prosthetics by understanding the way people with two legs catch themselves. They accomplished this by covering test subjects with motion-capturing sensors. It also required tripping them over and over — 190 times, to be exact — for a study. But because humans are so mentally geared to resist stumbling, the team first had to design a stumbling device.

Engineers Develop More Stable, Efficient Prosthetic Foot

  • Magazine Article
  • TBMG-34805
Published 2019-07-01 by Tech Briefs Media Group in United States

Engineers have developed a more stable prosthetic leg — and a better way of designing them — that could make challenging terrain more manageable for people who have lost a lower leg. The cornerstone of the new design is a kind of tripod foot that responds to rough terrain by actively shifting pressure between three different contact points. As important as the foot is, the team also developed a tool for quickly emulating and improving their prototypes.

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Innovative Knee Airbag (KAB) Concept for Small Overlap and Oblique Frontal Impacts

Detroit Engineered Products (DEP) Inc.-Rahul Makwana
Ford Motor Co., Ltd.-Pardeep Jindal
Published 2019-04-02 by SAE International in United States
Considerable research has been conducted in terms of attempting to reduce lower leg injury risk in full frontal impacts, in some cases by the use of a knee airbag (KAB). However, there has been limited research into the performance of KAB systems during a crash test with increased oblique loading, such as the IIHS small overlap frontal test, an oblique moving deformable barrier test (OI) being researched by NHTSA, and a mobile progressive deformable barrier test (MPDB) that is expected to be implemented by Euro NCAP in the next few years. The objective of the current numerical study was concentrated on the evaluation of an innovative KAB concept design intended to reduce ATD right inboard lower leg/foot responses under small overlap and oblique loading conditions. A novel appendage KAB concept design was developed with the help of morphing and computational studies which were performed with different ATD sizes. In the study, one of the lower leg/foot responses was monitored and compared over a conventional KAB design. Cases investigated in the study showed that the novel…
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Use of Cellphones as Alternative Driver Inputs in Passenger Vehicles

Clemson University-Chengshi Wang, Kim Alexander, Philip Pidgeon, John Wagner
Published 2019-04-02 by SAE International in United States
Automotive drive-by-wire systems have enabled greater mobility options for individuals with physical disabilities. To further expand the driving paradigm, a need exists to consider an alternative vehicle steering mechanism to meet specific needs and constraints. In this study, a cellphone steering controller was investigated using a fixed-base driving simulator. The cellphone incorporated the direction control of the vehicle through roll motion, as well as the brake and throttle functionality through pitch motion, a design that can assist disabled drivers by excluding extensive arm and leg movements. Human test subjects evaluated the cellphone with conventional vehicle control strategy through a series of roadway maneuvers. Specifically, two distinctive driving situations were studied: a) obstacle avoidance test, and b) city road traveling test. A conventional steering wheel with self-centering force feedback tuning was used for all the driving events for comparison. Based on the lane position and vehicle response data collected, the operators’ lane tracking capability during city road traveling was slightly inferior using a cellphone compared to traditional steering wheel. However, in extreme maneuvers like obstacle avoidance…
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Testing of Welded and Machined A36 Steel T-Joint Configuration Specimens

Deere & Company-Eric M. Norton, Casey Gales, Ryan Blodig, Michael Lister
HBM nCode Federal-Tom Cordes
Published 2019-04-02 by SAE International in United States
For this latest SAE Fatigue Design and Evaluation project, fatigue tests were run by loading, in bending, both welded and machined T-Joint specimens that have the same geometry. The test rig setup consisted of a horizontally mounted actuator, with pinned joints at both ends, where the load is applied to the top of the vertical leg of the “upside down T” of a T-Joint specimen, while the horizontal legs of the “upside down T” were clamped to the bedplate. Specimens were tested until failure or until the specimen was unable to carry the commanded load. They were cycled under constant amplitude (at several load levels and R ratios), block cycle, and variable amplitude loadings. Welded and machined T-Joint specimens of the same geometry were included in the test plan such that fatigue life predictions could be compared to test lives for each case. Those comparisons would demonstrate the methodology’s relative predictive ability to manage welds, residual stress, etc... Fatigue tests were successfully completed on thirty T-Joint specimens (seventeen welded and thirteen machined).
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Residual Injury Situation and Accident Characteristics of Severe Motorcycle Accidents

Hannover Medical School-Dietmar Otte
Published 2019-04-02 by SAE International in United States
The total number of persons severely and fatally injured in road traffic accidents has reduced considerably in recent decades. However, the number of motorcyclists involved in accidents has not reduced to the same extent, and some countries have even recorded an increase. The aim of this study is to analyse the circumstances of motorcycle accidents in Germany involving vehicles with a cubic capacity of over 125 cm3 with particular reference to severely or fatally injured riders. An analysis is to be made of the characteristics and patterns of injuries suffered by the most severely injured motorcyclists and proposals developed for injury prevention. The study included accident data from 464 motorcycle accidents collected in Hanover and Dresden between 2010 and 2015 by an academic research team in the course of the GIDAS project (German In-Depth Accident Study). This data represents a statistically representative sample from real accidents occurring in Germany. The analysis of the current injury situation shows that motorcyclists are often severely injured, i.e. suffered injuries of grade MAIS 3+ (so called serious injuries) in…
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Active Safety Bicyclist Test Targets Recommendation

Active Safety Systems Standards Committee
  • Ground Vehicle Standard
  • J3157_201902
  • Current
Published 2019-02-06 by SAE International in United States
The goal of the Bicyclist Test Mannequin Task Force is to develop standard specifications/requirements for bicyclist test mannequins (one adult and one child) that are representative of real bicyclists to the sensors used in Bicyclist Detection systems and can be used for performance assessment of such in-vehicle systems (including warning and/or braking) in real world test scenarios/conditions. This version of the document only includes the recommended bicyclist mannequin characteristics for vision, Lidar, and/or 76 to 78 GHz radar-based Bicyclist Pre-Collision systems.
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Rehab Device Works with All Joints of Lower Limbs

  • Magazine Article
  • TBMG-33854
Published 2019-02-01 by Tech Briefs Media Group in United States

South Ural State University Chelyabinsk, Russia

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Styling and Packaging Approach to Meet Pedestrian Upper Leg Requirements as per Euro NCAP Protocol

Tata Motors Limited-Dnyaneshwar Mhaskar, Ashish Kumar Mahapatre, Milind Bhagat
Published 2019-01-09 by SAE International in United States
In most of the countries all over the world, thousands of pedestrians and vulnerable road users are struck by motor vehicles and getting killed or get severe injuries. Accident research data shows that pedestrians are a significant proportion of all road user casualties [1]. In pedestrian impact with vehicle front end, several organ forms impact directly to front end of the vehicles and get severe injuries in head, lower leg and pelvis region. Pelvis region of pedestrian get severe injuries due to hit by Bonnet Leading Edge. Impact force is major injury driving parameter in case of pelvis region. In earlier Euro NCAP Pedestrian Protocol -v7.1.1 [2], upper leg impact energy calculation was based on BLE (Bonnet Leading Edge) height and bumper lead. Vehicle front end styling was not playing any role in deciding upper leg impact energy. Upper leg impact performance was purely dependent on BLE height and package space available. Whereas in current Euro NCAP Pedestrian Protocol -v8.4 [3], upper leg impact energy calculation is estimated based on vehicle front end styling and…
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Device Assesses and Monitors Lymphedema Noninvasively

  • Magazine Article
  • TBMG-33449
Published 2018-12-01 by Tech Briefs Media Group in United States

Lymphedema is the swelling that generally occurs in the arms or legs caused by the removal of or damage to lymph nodes as a part of cancer treatment. Treating it at the earliest possible stage is the best way to manage the condition and prevent it from leading to pain, recurrent infection, reduced mobility, and impaired function.