Tuesday, November 20, 2012

Piaggio has recently been investing its efforts in the creation of a new scooter model


Engineer's Toolbox:
Fatigue and durability performance evaluation of scooter crankshaft

A Piaggio scooter. The Piaggio Group is the European leading manufacturer of two-wheeled motor vehicles.


The Piaggio Group is the European leading manufacturer of two-wheeled motor vehicles and also holds an international leading role in the commercial vehicle market.
With over 7,000 employees and facilities and research centers scattered over Italy, Vietnam, Spain, China, and India, Piaggio has recently been investing its efforts in the creation of a new scooter model destined for the Indian market and has chosen LMS Virtual.Lab Durability software to address engineering challenges linked to this new ambitious strategic move.
Piaggio started on the project with an in-depth analysis of the Indian market demand characteristics and singled out a few key features of the "scooter to be," such as low cost, high engine efficiency, low fuel consumption, low driver-ground distance, and low engine emissions.
With these guidelines, Piaggio started developing a new small displacement engine that could respond to these requirements. And when the engineers came up with a first design for the crankshaft, the system was submitted to the motor center to assess the soundness of the components.
The engine center employed LMS Virtual.Lab Durability to reproduce and analyze the crankshaft subcomponents' fatigue and durability performance, using the "hot-spot" feature to single-out the "least safe point" of the system.
The engine center employed LMS Virtual.Lab Durability to reproduce and analyze the crankshaft subcomponents' fatigue and durability performance, using the "hot-spot detection" feature to single out the most critical areas of the system.




The results highlighted a spot next to the contact surface between the crankshaft and the crankpin. Using Virtual.Lab's damage contribution analysis demonstrated that the crankshaft/crankpin interference fit was the main source of fatigue damage. This information showed Piaggio that design variations on this assembly were delicate and could affect the whole crankshaft performance.
Virtual.Lab's output data on this spot were then compared to Piaggio's standards: the conclusion was that, with the current design, all crankshaft components, including the hotspot, satisfied Piaggio safety factor criteria.
"But what would have happened to the crankshaft's performance, and in particular to our hot spot, if -- without simulation analysis -- we had decided to slightly change the design of one of the system subcomponents?" asks Engineer Riccardo Testi, a long time Virtual.Lab user from Piaggio's motor center division. "Virtual.Lab provided us with the answer to this question, as it helped us calculate the impact of all neighboring components on the system and pinpoint the highest load channel in the system."
Virtual.Lab helped Piaggio calculate the impact of all neighboring components on the system and pinpoint the most damaging load channel in the system.


Finally, the initial crankshaft design was maintained, and Piaggio moved on to finalize the scooter project.
"Use of LMS Virtual.Lab Durability in Piaggio cut the number of required prototypes in half, effectively reducing the development cycle," says Testi.
Piaggio has been an LMS tool user for many years, and the motor center division has just recently added LMS Virtual.Lab Motion to their virtual simulation portfolio for effective analysis and optimization of real-life performance of their mechanical systems.
"LMS is a great partner," Testi says. "What we also strongly valued in LMS during the benchmarking process of LMS Virtual.Lab Durability was their responsiveness in adapting the tool completely to the existing development process."
Want more information? Got to LMS website or contact LMS directly atinfo.us@lmsintl.com
Source: LMS
Published November 2012

Tuesday, August 14, 2012

Factors Affecting Top Speed and Mileage


#25 Factors Affecting Top Speed and Mileage

May 29, 2012
As with our last installment, I’m not addressing a specific question, but a lot of questions or conversations I’ve heard about motorcycle or scooter top speed and mileage:
Why do other scooterists report better mileage or a higher top speed than I seem to get from my scooter?
or
Why does my mileage seem to fluctuate so much?
or
Why am I not getting the mileage promised by the brochure?
Sometimes I get the impression that folks don’t realize how many factors can affect both mileage and top speed. Both can vary immensely depending on a variety of conditions. Some of these variables make a bigger difference than others, but all together, they make scientific comparison very difficult.
What factors can affect your mileage or top speed? Here are a few dozen off the top of my head, I’m sure commenters can offer more.
  • Weight
    Body/clothing weight variations
    Passenger
    Cargo and luggage
    Weight of fuel in the tank (full vs. empty tank)
  • Aerodynamics
    Cargo
    Clothing
    Accessories/windscreen
  • Weather
    Wind direction/speed
    Temperature
    Altitude/Barometric pressure
    Humidity
  • The Road
    Riding style (aggressive acceleration/braking)
    Open road vs. traffic/lights
    Surface temperature
    Surface texture
    Grade (uphill/downhill)
    Direction (straight line or curves)
  • Fuel
    Freshness
    Quality
    Octane (NOT a measure of “quality,” use the proper octane, higher isn’t better!)
    Weight of fuel in tank
  • Tires
    Inflation
    Quality/tread design/intended use
    Tread wear
    Temperature
  • Engine
    Cleanliness
    Adjustment of valves, timing, compression
    Cleanliness/design of fuel/oil/air filters
    Obstructions in airflow
  • Speedometer/Odometer calibration
  • Perception and Confirmation Bias
    If I’ve learned anything on the forums, it’s that there are people who have their own ideas about their mileage and/or top speed, and nothing anyone can say will convince them otherwise. If the brochure said the top speed was 60mph and the bike offers 120mpg, well, they’re getting even better than that, damnit! If they’re not, it has nothing to do with the factors above, it’s a defective bike, or their shop screwed something up last time they were in. No, really, they can FEEL it! Take any measurement of top speed with a grain of… well, unless salt flats and a lot of timing technology were involved, don’t believe it. Same with mileage, if a notebook, a graduated cylinder, and a full year or so of measurements aren’t involved, it’s just anecdotal. And even then, that rider’s conditions may vary wildly from yours.
To specifically answer the last question, “Why am I not getting the mileage promised by the brochure?,” The answer is simple. The mileage figure quoted in the brochure IS attainable. All you need to do is lose 140 pounds, and ride on a perfectly level sheet of stainless steel, at 65°F with a 25mph wind at your back. Be sure not to accelerate, decelerate, or stop, and keep the engine at 1210 RPM, just above idle. Eventually you’ll work your way up to 25, maybe 30mph, but you’ll be getting great mileage.
Do you have a question for the 2strokebuzz experts? Email Dr. BuzzYour confidentiality is guaranteed.
Note: Dr. Buzz is an unlicensed, mostly-fictional doctor. Take his advice, and that of his team of experts, with a grain of salt.

Chicago 2012 Mods vs Rockers photos


Chicago Mods vs Rockers 

Looks like they had a great weekend of fun.2012 Photos

June 19, 2012

The 2012 2012 Mods vs. Rockers rally was Father’s Day Weekend, we made it out to the Mayday SCFriday night party at Late Bar, but once again we couldn’t make it to the main event on Saturday, so Jordan sent loads of great photos. Thanks, Jordan!