The SAE MOBILUS platform will continue to be accessible and populated with high quality technical content during the coronavirus (COVID-19) pandemic. x

Your Selections

Productivity
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

FAULT IDENTIFICATION OF ASSEMBLY PROCESSES USING FUZZY SET THEORY

University Of Detroit Mercy-Mostafa Mehrabi
University Of Detroit Mercy-Jonathan Weaver
  • Technical Paper
  • 2020-01-0487
To be published on 2020-04-14 by SAE International in United States
performance and productivity. Tracking faults in a typical manufacturing system is inherently an inverse problem which makes it more challenging and difficult to solve. Presented in this article is the development of a new methodology for fault identification and root-cause analysis of complex assembly systems. A combination of a knowledge-based system and fuzzy set theory is used to develop this new technique, which is an intelligent system that mimics the behavior of an expert in the field, and can trace back the source(s) of the fault to the relevant station. Examples from real assembly operations are provided to show the effectiveness of this approach.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Leverage wireless technologies in timber harvesting to enhance operational productivity and business profitability

John Deere-Ishani Pandit, Suchitra Iyer
  • Technical Paper
  • 2020-01-1378
To be published on 2020-04-14 by SAE International in United States
Growing needs of forestry products; primarily wood followed by pulp and paper industry have mechanized the process of harvesting timber in most part of world. Such job sites have several machines and vehicles working together to harvest and transport the logs. Timber logging is very similar to crop harvesting with longer harvesting cycle and hence it is critical that every part of it is effectively utilized; timely harvest and transport to factories play an important role. Traditionally, these areas have had little cellular connectivity, restricting communication between operators, machines, land owners and factories. With better connectivity, it will be easier to monitor and operate job sites for example if skidder would know how many trees are felled, how many logs and bunches are created and where they are kept; it would reduce time and fuel spent in searching for logs. Also, with better communication between machines, skidder would know when to pick up logs and avoid longer wait time. Timely pick up of felled trees is critical in ensuring log quality. With upcoming wireless technologies…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Improving Robotic Accuracy through Iterative Teaching

The University of Sheffield - AMRC-Daniela Sawyer, Lloyd Tinkler, Nathan Roberts, Ryan Diver
  • Technical Paper
  • 2020-01-0014
Published 2020-03-10 by SAE International in United States
Industrial robots have been around since the 1960s and their introduction into the manufacturing industry has helped in automating otherwise repetitive and unsafe tasks, while also increasing the performance and productivity for the companies that adopted the technology. As the majority of industrial robotic arms are deployed in repetitive tasks, the pose accuracy is much less of a key driver for the majority of consumers (e.g. the automotive industry) than speed, payload, energy efficiency and unit cost. Consequently, manufacturers of industrial robots often quote repeatability as an indication of performance whilst the pose accuracy remains comparatively poor. Due to their lack in accuracy, robotic arms have seen slower adoption in the aerospace industry where high accuracy is of utmost importance. However if their accuracy could be improved, robots offer significant advantages, being comparatively inexpensive and more flexible than bespoke automation. Extensive research has been conducted in the area of improving robotic accuracy through re-calibration of the kinematic model. This approach is often highly complex, and seeks to optimise performance over the whole working volume or…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

A Communication-Free Human-Robot-Collaboration Approach for Aircraft Riveting Process Using AI Probabilistic Planning

Saarland University-Jörg Hoffmann
ZeMA gGmbH-Khansa Rekik, Rainer Müller, Matthias Vette
  • Technical Paper
  • 2020-01-0013
Published 2020-03-10 by SAE International in United States
In large scale industries attempts are continuously being made to automate assembly processes to not only increase productivity but also alleviate non-ergonomic tasks. However this is not always technologically possible due to specific joining challenges and the high number of special-purpose parts. For the riveting process, for example, semi-automated approaches represent an alternative to optimizing aircraft assembly and to reduce the exposure of workers to non-ergonomic conditions entailed by performing repetitive tasks.In [1], a semi-automated solution is proposed for the riveting process of assembling the section barrel of the aft section to its pressure bulkhead. The method introduced a dynamic task sharing strategy between human and robot that implements interaction possibilities to establish a communication between a human and a robot in Human-Robot-collaboration fashion. Although intuitive, interacting with the robot constantly is still not natural for the worker as in the manual process no explicit communication between both workers is needed.In this work a communication-free Human-Robot-collaboration solution is presented. The method developed not only enables sharing assembly missions by dividing tasks based on skills, but…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of High Productivity and Low Cost Card-Edge Type ECU for Motorcycles

Honda Motor Co., Ltd.-Yuichi TAKEDA, Daisuke SUGIO, Koji INOSE
Keihin Corporation-Syuichi TAKIOKA
  • Technical Paper
  • 2019-32-0516
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
To reduce global warming, Honda has been worked on emission reduction and fuel efficiency enhancement by applying fuel injection systems. The productivity enhancement and cost reduction are strongly demanded in developing countries as the market is expanding. To enhance productivity and reduce cost of ECU, application of the semiconductor production method has been started for printed circuits with edge connectors. However, products that fully meet the requirements of us have not been realized so far. The ECU developed this time has a structure shielding the whole PCB package except the edge connector terminals. Thus, the waterproofness required for an ECU has realized, as a standalone component, as the first in the world (by Honda survey). To achieve that, we developed transfer molding dies equipped with a unique mechanism never been applied. Moreover, we developed an epoxy resin that eliminates the after cure process. Thus, productivity of 5 times over conventional was realized with a multi-cavity molding capable of moldings more than 10 pieces at a time. Furthermore, a new waterproof card-edge connector was developed, in…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of Laser Welding Pressed-frame for Small Scooters Considering High Production Efficiency

Honda Motor Co., Ltd.-Sunao Kawano, Takeru Kobayashi
  • Technical Paper
  • 2019-32-0544
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
The laser-welded pressed-steel frame made of the high-tensile-strength steel sheet and suitable for high efficiency production has been developed for small scooters. In majority of the conventional designs, the frame of small scooters is composed of a large number of steel pipes and stamped parts complexly welded together, requiring a number of welded joints. As a result, since the welding length increase and the dimensional error of the frame body after welding tends to be large, a correction operation in a post process is required. This has been one of the factors preventing further enhancement of production efficiency. In an attempt to cope with this issue, we have chosen to apply the pressed-steel frame construction using the high-tensile-strength steel sheet, which has been applied to small motorcycles, to small scooters. In addition, we replaced the spot welding with more efficient laser welding to further enhance productivity. The optimum cross section design taking advantages of the pressed-steel frame construction permits more gradual changes of cross sectional area than the conventional steel pipe frame, allowing dispersing of…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Optimized Wet Clutch Design

Endurance Technologies Ltd., India-Nitin Bhone, Sachin Thakare, Ashutosh Jahagirdar
  • Technical Paper
  • 2019-32-0553
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Multi-plate wet clutches used in motorbikes transmit the torque by friction under pressure between driving and driven Plates. The life & performance of the clutch for the friction material used, depends on amount of energy generated during clutch slip, amount & uniformity of heat dissipation amongst the plates and surface texture of mating surfaces.Above parameters if not properly considered during design stage may lead to higher temperature of rubbing surfaces. Higher temperature further reduces the friction coefficient and increases the wear rate of friction material leading ultimately to lower torque capacity of clutch. The temperature rise in a wet clutch is the balance between amount of heat generated and the amount of heat dissipated by oil flowing through clutch. The maximum amount of oil is limited by the requirement of clutch drag torque, Which decides the quality of neutral finding and gear shift feel on vehicle.Further, if roughness of rubbing surfaces is not controlled in mass production, it leads to fast wear of friction material during initial operating cycles. The rate of wear is faster…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Unsettled Technology Domains in Robotics for Automation in Aerospace Manufacturing

Muelaner Engineering, Ltd.-Jody Muelaner
  • Research Report
  • EPR2019010
Published 2019-12-20 by SAE International in United States
Cost reduction and increasing production rates are driving automation of aerospace manufacturing. Articulated serial robots may replace bespoke gantry automation or human operations. Improved accuracy is key to enabling operations such as machining, additive manufacturing (AM), composite fabrication, drilling, automated program development, and inspection. New accuracy standards are needed to enable process-relevant comparisons between robotic systems.Accuracy can be improved through calibration of kinematic and joint stiffness parameters, joint output encoders, adaptive control that compensates for thermal expansion, and feedforward control that compensates for hysteresis and external loads. The impact of datuming could also be significantly reduced through modeling and optimization. Highly dynamic end effectors compensate high-frequency disturbances using inertial sensors and reaction masses. Global measurement feedback is a high-accuracy turnkey solution, but it is costly and has limited capability to compensate dynamic errors. Local measurement feedback is a mature, affordable, and highly accurate technology where the robot is required to position or align relative to some local feature. Locally clamped machine tools are an alternative approach that can utilize the flexibility of industrial robots while…
Annotation ability available

Changing How the Aerospace Industry Makes Parts

  • Magazine Article
  • TBMG-35684
Published 2019-12-01 by Tech Briefs Media Group in United States

Technology that increases production rates and part quality, while reducing setup times and costs, is seeing a surge in demand within the aerospace sector as the commercial aircraft backlog continues to grow.

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

High Durable PU Metallic Monocoat System for Tractor Sheet Metal Application

Mahindra & Mahindra, Ltd.-Rahul Lalwani, Sudhir Sawant, Yogesh keskar, Nitin Pagar
Mahindra Research Valley-Vinay Kumar
  • Technical Paper
  • 2019-28-2541
Published 2019-11-21 by SAE International in United States
In sheet metal painting for various applications like tractor and automobiles, most attractive coating is metallic paints. It is widely applied using 3 coat 2 bake or 3 coat 1 bake technology. Both options, results in high energy consumption, higher production through put time and lower productivity in manufacturing process. During various brainstorming and sustainability initiatives, paint application process was identified to reduce burden on environment and save energy. Various other industry benchmarking and field performance requirement studies helped to identify critical quality parameters. There was collaboration with supplier to develop monocoat system without compromising any performance and aesthetic properties. This resulted in achieving better productivity, elimination of two paint layers, substantial reduction in volatile organic content, elimination of one baking cycle and energy saving.Metallic mono-coat formulated using strong polyurethane resins and latest technology pre-coated aluminum pigment for achieving metallic effect in finish. With new resin technology, further reduction in baking temperature and energy is possible.
Annotation ability available