Thursday, April 17, 2008

MEMS Resources

MEMS Resources on WEB

Compiled by AEG

Here is a comprehensive list of MEMS resources that proves to be helpful time to time.

A number of portals specializes in MEMS ,some of them a listed below

  1. http://en.wikipedia.org/wiki/MEMS

Any exploration in the internet starts from the wikipedia. The description of MEMS here is not very thorough but it serves the purpose. The links associated to these documents are useful.

  1. http://www.memsnet.org/mems/

This portal is entirely dedicated to the MEMS community. It gives a basic overview about MEMS and Nanotechnology and provides a comprehensive idea about the micro fabrication processes. This site provides a link to the founder company https://www.mems-exchange.org/ , which is a contract foundry service. The job board and the discussion groups is the main attraction of this site whereas the news and event sections are regularly update which makes this site very attractive. While browsing this site, don’t overlook a menu on the right side, as it contains important information. The material database is particularly very useful to researchers.For more information their very rich link section is highly recommended.

http://www.memsnet.org/links/

  1. http://www.allaboutmems.com

This is a community oriented website with full range of information available on MEMS. MEMSCAP, Inc. a foundry service initiated this site, the content of this site is non-commercial, but apparently the sections are full of old links and the site is not maintained regularly.

  1. http://www.memsindustrygroup.org

This site is an excellent place to take a peek at the MEMS industry. The news and events section very informative. The site is well maintained on a daily basis and the member section looks very appealing. Unfortunately the membership is not for single users but only for companies.

  1. http://www.memsinvestorjournal.com/

This is a free weekly newsletter which publishes stories , inventions and interviews for the MEMS community. The stories by the categories helps in tracking the advances in each field of the MEMS technology.

  1. http://memscyclopedia.org/

This site intends to give an introduction to MEMS (not so short introduction). The best thing about this site is a free book with 5 chapters on the MEMS technology). The book is download able.

  1. http://www.trimmer.net/

This site is hosted by Dr. Willium Trimmer, Founding Editor of the Journal of Microelectromechanical Systems. It contains a lot of links, but unfortunately it seems the site is not updated regularly. The list of MEMS companies was found to be very helpful.

  1. http://www.memsuniverse.com/

This is a blog which records the latest inventions in MEMS technology


Monday, April 7, 2008

AEG Carbon Fiber-Polyurethane Solid Tire

AEG Carbon Fiber-Polyurethane Solid Tire


Military Tire-WHEEL (MTW) ASSEMBLY FOR Future tactical and combat vehicles is placing emphasis on handling, traction, and cornering tire performance for the light trucks. In order to meet these high performance standards, solid tire with aspect ratio lower than 0.35 have been developed by American Engineering Group (AEG), Akron, Ohio

  • Tire Size: LT225/35R19
  • Rim Width: 7.0 inches
  • Tread Width: 7.6inches
  • Overall Diameter: 25.0 inches
  • Speed rating:80mph

AEG aims to eliminate tire blowouts with its remarkable integrated Carbon Fiber Ring-Wheel “MTW” assembly, a solid one-piece wheel-and-tread system that could soon enter manufacturing. The MTW's rim is bonded to soft polyurethane foam that provides the shock-absorbing property of a traditional pneumatic tire. The circumference of the soft polyurethane foam layer is bonded to a Carbon Fiber ring along with tire tread. By varying the thickness and geometry of the polyurethane soft layer, this unique tire-wheel assembly can generate a wide array of ride and handling performance.

MTW’s vertical stiffness (ride comfort performance) and lateral stiffness (handling and cornering performance) can both be optimized, pushing the performance envelope in various military applications.


AEG Carbon Fiber-Elastomer Composite Bipolar Plate for PEM Fuel Cells

AEG Carbon Fiber-Elastomer Composite Bipolar Plate for PEM Fuel Cells


Fuel cells constitute one of the most promising sources of environmental friendly energy for the future. These systems produce electrical energy by converting the chemical energy stored in a fuel, such as hydrogen or methanol, through oxidation-reduction reactions. A proton exchange membrane (PEM) fuel cell is a stack of electrochemical cell systems (Figure) placed in series. Since the electrons must transit from the anode of one cell to the cathode of the next cell, electrical conductivity through the plate is a main requirement. Another important requirement is the low permeability to the reacting gases or to ions. The bipolar plates should remain chemically inert for an extended period of time. The bipolar plates also should be lightweight and easily manufactured using mass-production technologies. Cost reduction is the most critical issue for automotive industry to achieve the practical use of proton exchange membrane (PEM) fuel cells. The bipolar plate is the most expensive component in the current fuel cell system assembly.

American Engineering Group (AEG, Akron, OH) has developed a new elastomer-carbon fiber composite bipolar plate for PEM fuel cells with high electrical conductivity, high strength, light weight and very low permeability. This new unique composite bipolar plate is a less-expensive and light-weight alternative to graphite and steel. The use of highly conductive elastomer compound and multi-stage molding technology enables the fabrication of bipolar plates with high carbon fiber content. This composite bipolar plate is a promising solution, as their thermal and chemical stability is matched by good mechanical strength and dimensional stability values.

This plate has the potential for being produced at low cost. The plate is produced using short carbon fiber structure with elastomer impregnation into pre-form uncured structures. This AEG proprietary multi-stage manufacturing process makes this multi-layer elastomer-carbon fiber plate very conductive and low permeable. Current AEG effort is to optimizing the manufacturing process, characterizing prototype components and power generation tests. Preliminary study noted following features for the new carbon fiber bipolar plate:

· Bulk Conductivity : 600 Siemens/cm

· H2 permeability :2 x 10-6 cm3/cm2-sec

· Corrosion rate :10 μA/cm2

· Estimated Cost :$9/kW


American Engineering Group

Noise, Vibration and Harshness (NVH) Analysis by American Engineering Group (AEG)

Noise, Vibration and Harshness (NVH) Analysis by American Engineering Group (AEG)

NVH analysis provides essential benefits towards designing vehicles for ride comfort and quietness, an increasingly competitive advantage in today's global automotive market. The design of a car body structure is decisive in order to gain favorable vibration and acoustic behavior of vehicles. The body structure is the most significant transfer path for road-excited and engine-excited vibrations. The body panel vibrations are then radiated into the vehicle cavity, where they are perceived as audible noise. Apart from the audible noise, which is transferred into the cavity, structural vibrations of the body are perceived as an annoyance as well.

AEG Product Design and engineering solutions have a dedicated and focused NVH team with core competency in solving complicated design problems pertaining to automotive and aerospace applications with HPC (High Performance Computing : SGI-Altix/16 GB RAM/1500 GB HDD/Msc.Nastran 2005 R2 DMP etc) resources. The NVH team comprises of experienced and skilled team members having automotive background in various engineering disciplines which help designers analyze the NVH attributes before the first vehicle prototype is built, allowing engineers to understand potential problems and identify solutions early in the design process.

AEG has engineering team with fully equipped engineering tech center in Bangalore, India who imparts necessary knowledge and experience during the product design and development process. Few of the capabilities include aero-acoustic analysis, exhaust system acoustic analysis, NVH optimization (body, chassis, brake, tire etc.), and transmission loss studies. In any vehicle NVH, testing plays a major role in optimizing the vehicle design for NVH. Our design experts have hands-on experience in Test plan preparations, Testing methods and techniques, Testing, Test data collection and analysis, Test-CAE correlation techniques, Design modifications based on testing etc.

Fuel Cell Nanocomposite Double Lip Seal From American Engineering Group (AEG)

Fuel Cell Nanocomposite Double Lip Seal From American Engineering Group (AEG)

Nanocomposite double lip seal is a new nanotechnology based “over molded” seal for fuel cells from American Engineering Group , Akron, OH. This unique “double lip” seal has a primary and a secondary sealing surface. This EP terpolymer based elastomer formulation has a nano-blowing agent which helps to maintain high “long-term” sealing force retention in a fuel cell thermal cycling operational environment with vibration loads. This new nano technology based elastomer seal show very less “electrode poisoning” in fuel cell system. This sealing technology is adaptable to various planar fuel cell designs.

This acid resistant, high temperature stable over-molded plastic seal has a nano-blowing agent which activates in steam based curing. Compared to other elastomers, this nano-composite elastomer has excellent resistance to creep and fatigue with good flexibility and clear film. AEG’s proprietary steam post-curing protocol allow to extract all the un-reacted catalysts/monomers and also allow to activate nano-blowing agent in the EP terpolymer system. This seals has excellent chemical resistance with good UV and weather resistance. Low NBS smoke generation and high heat resistance with excellent dielectric strength.

AEG development engineers can help you to find a cost-effective fuel cell seal design based on this new seal technology. AEG has technology-driven design tools to provide optimum sealing on the customer fuel cell stack design using following analysis:

• “Volume fill” analysis

• Compression tolerance stack-up analysis

• Lateral tolerance stack-up analysis

• Design Failure Mode and Effects Analysis (DFMEA)

• Finite Element Analysis using a 3D CAD

Our Indian seal manufacturing facilities are ISO 9001/TS 16949 registered, and we constantly strive to improve customer satisfaction through the implementation of new seal technology with following quality/value improvement programs:

• Lean manufacturing/ Kaizen initiatives

• TQM studies

• Advance Product Quality Planning (APQP) studies

• Six Sigma scrap & cost reduction programs

This design was was presented in SAE World Congress 2007 .

The official publication can be found in the following link

http://www.sae.org/exdomains/dailys/elements/showdaily/thursday.pdf

AEG Maintenance-Free Self-Lubricating Sliding Bearings

Maintenance-Free Self-Lubricating Sliding Bearings from American Engineering Group(AEG)

The present day bearing materials pose an enormous challenge because, frequently, zero maintenance is expected under severe to extreme conditions as well as under maximum loads. The constant pressure on costs additionally calls for increasing uptime of machinery and equipment and uncompromising standards of operational reliability. Maintenance-free, self-lubricating, heavy duty friction materials produced for bearings of the automotive industry offers bearing solutions guaranteed to operate reliably and safely over long term.
The self-lubricating composite sliding material consisting of a steel backing and a sliding layer. It is manufactured by using a continuous hot rolling sintering technology. This increases the reliability and service lifetime of the sliding plates significantly. These sliding materials can be used with any sliding surfaces (e.g., plain sliding surface, sliding layer with clean grooves or lubrication indentations. It normally requires no lubrication and allows maintenance free operation. It is characterized by high wear resistance, insensitive to impact stress and resistant to harsh operational and ambient conditions of mechanical and chemical environment. It is suitable for rotational, oscillating and linear movements. These materials can be machined to complex geometrical shapes without the loss of the self-lubricating properties.
They possess a high static and dynamic load bearing capacity and are utilizable at temperatures ranging from -260o to +280o
C. Extensive material and application expertise covers a very wide range of industries (automotive, tire, rail, hydro, and steel). The dry wear mechanism enables these bearings to operate satisfactorily in the absence of conventional lubricants. These bearing materials contribute to enhance performance and optimum characteristics in all industrial segments.
AEG provides assistance in the selection, design and manufacturing of the bearing materials. Make use of our latest material developments for your custom designed component. Important selection criteria are sliding speed, sliding load, temperature and other application specific influences.

Shock and Vibration Mounting System from AEG

Shock and Vibration Mounting System from AEG

American Engineering Group (AEG) has developed a new low cost “Dual Structure Shock Mount System”. This new AEG mount system design will allow varying static properties and provide dynamic shock and vibration mitigation over a wide load range for automotive and industrial applications. This dual structure system provides both axial and radial damping. The mount system will have two hollow spherical elements with top element functions as a “load bearing” element and the bottom spherical element as a vibration shock damping element.

This design-formulation concept promises higher axial-radial stiffness, vibration damping, and extended life. Finite element results and prototype testing demonstrates the optimum stiffness and damping properties for the radial and axial deflection in service conditions.

With recent advances in material technology, processing, and design concepts, AEG has achieved this vibration and shock performance improvement. This two element structural isolation concept is successfully used in aerospace and marine applications for sound and vibration isolation. Material choices and mount designs are established based on the requirements for the combined axial and radial loads experienced by the current mount systems. The dual mount design concept will be to maintain stiffness to dynamic loads, while providing enough damping to equipment vibration and shock loads.

The automotive industry could also apply this mount to an engine and silent mount design. The construction and heavy equipment industries can use these mounts on shocked vehicles for increased shock durability. This dual mount system will offer significant improvements in reliability and maintainability by reducing acquisition cost, reducing inspection intervals, extending the damage tolerance threshold and improving design efficiency.

Focused Engineering Solutions by AEG

Focused Engineering Solutions for the Manufacturing Supply Chain by American Engineering Group

Computer-Aided Design, Engineering and Manufacturing (CAD/CAE/CAM) are tools that help reduce costs and shorten the design, prototype and production cycle. These computer-aided tools can also help to incorporate Six Sigma, Lean manufacturing and Just-In-Time (JIT) in the supplier processes bringing credibility to new design concepts. American Engineering Group (AEG) is utilizing these tools to provide a Multisourcing Manufacturing Solution (MMS) by bringing new automotive components to the marketplace in the shortest possible time, with the lowest cost, and highest quality.

CAD/CAE/CAM are becoming more popular as a standard analysis tools in the automotive industry for design, failure and manufacturing process analyses. Another notable reason for this popularity is the recent changes in automotive specification requirement for parts comprised of new materials or designs. The automotive industry is trying to make components that could withstand 500,000 miles of minimum warranty.

The automotive OEM companies have been changing their way of doing business. Traditionally the automotive companies would design and develop a product, perform comprehensive testing, send prints and specifications to suppliers for quotes. The most cost competitive supplier got the business. To remain competitive on a global basis, the automotive companies now are relying on their suppliers to provide product design, analysis, testing and manufacturing. The new approach is to get product through a Multisourcing Manufacturing Provider (MMP). This is an evolution of the old supply and demand chains into new one-to-one MMP relationship. In the past, it may have been enough to have the lowest cost. Now, a supplier must have world class quality, excellent service, low cost, be globally competitive and deliver just in time. In order to obtain these goals, it is essential that manufacturers reduce their product development design cycle time and shortened time to market. CAD/CAE/CAM are tremendous productivity tools for the engineer to create, test, modify and manufacture design ideas.

AEG Torsional Damper - brief description

American Engineering Group (AEG) has developed a new “Dual Torsional Damper System”. This new AEG system design will allow varying static properties and provide dynamic shock and vibration mitigation over a wide load range for automotive and industrial applications. This dual structure system provides both axial and radial damping. The torsional damper system will have two elastomer elements with top element functions as a vibration damping element and the bottom spherical elastomer element as a noise & harness damping element.

AEG dual mode damper system includes a spherical soft viscous bushing hub designed for being rigidly connected to a drive shaft, and an inertia ring, connected to the hub by means of a thin Polyurethane material layer. This dual-layer elastomer damper system is designed for torsional vibration reduction of the crankshaft system on multi-cylinder engine for vehicles. AEG polyurethane torsional dampers are designed to provide significant reduction of sound and vibration in various types of powertrain systems, protecting engine and transmission component from excessive wear. By reducing torsional vibration, component life is increased while providing greater operator comfort and better service life. This unique AEG damper design is desirable for truck, off-road vehicle, marine, agricultural, and military vehicle engine application where higher performance torsional damping and vibration eliminating solutions are a major priority.

AEG Torsional Damper performance

  • Dual mode torsional damper(Patent pending)
  • Viscous soft elastomer spherical hub eliminate transmission noise
  • Polyurethane elastomer torsional damper reduces torsional vibration that contributes to gear NVH and wear in transmission.
  • Self-aligning spherical hub eliminate concentricity concerns
  • Torsional stiffness up to 900ft-lbs of torque capacity
  • The design was presented in SAE 2008 World Congress held in Detroit.MI in April 2008 .Please follow the link below for the official publication

    http://www.sae.org/exdomains/dailys/elements/showdaily/wednesday.pdf