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May 2, 2009
New Equipment Launched for Road Safety

Motorists who drink and drive now have an even greater chance of being caught, with the launch of a range of new road safety equipment for Tasmania Police.

The equipment includes extra speed detection devices, breath test equipment and drug wipe kits to assist traffic and uniform police in day-to-day road safety operations.

The new operational equipment, costing $360,000, was launched in Hobart by the Minister for Police and Emergency Management, Mr David Llewellyn.

“Tasmania Police do an outstanding job and it has long been the commitment of this government to ensure that they have the best equipment possible with which to carry out their duties,” Mr Llewellyn said.

“This ongoing commitment to operational policing, and the government’s road safety strategy, will see eight Ultralyte laser speed guns, 32 Lion SD 400 breath testing units, 400 reflective vests and 260 rechargeable torches, fitted with traffic wands, deployed to frontline policing.”

Mr Llewellyn said that in addition to the equipment, the government had purchased more Securetech drug wipe kits.

“Since Tasmania Police began the oral fluid testing in July 2005, more than 700 tests have been conducted on Tasmanian drivers with 234 directed to undertake a blood test following a positive response with the drug wipe,” he said.

“While speed and alcohol remain the major contributing factors to fatal and serious crashes on Tasmanian roads, those who drive with drugs present in their bodies are an equally serious risk to other road users and themselves.”

Also launched were two refurbished multi-purpose Mobile Command Centres, which will form an important part of frontline policing.

The Northern and Western Police Districts will each receive a Toyota Coaster bus.

“These vehicles are not only a Command Centre for use at major incidents on-site,” said Mr Llewellyn.

“They are also a mobile police station that can be used by the Public Order Response Teams, for major event management, road safety operations such as random drug and alcohol testing, and Search and Rescue co-ordination.”

Mr Llewellyn said the equipment will be immediately deployed throughout Tasmania. 

“Motorists who contribute to the rate of crashes in our community by drinking and driving stand a greater chance of being caught,” he said.

“All of this equipment we have now provided is aimed at ensuring that the members of Tasmania Police are as well equipped as they can be to do their difficult job as safely as possible and to enforce the laws of this State as efficiently as they can.”


Posted at 03:16 am by dravid
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Apr 30, 2009
Future Helicopters Get SMART

Tests in a NASA wind tunnel of this SMART rotor hub confirm the ability  of advanced helicopter-blade active control strategies to reduce  vibrations and noise. Image Credit: NASA

Helicopters today are  considered a loud, bumpy and inefficient mode for day-to-day domestic  travel—best reserved for medical emergencies, traffic reporting and  hovering over celebrity weddings.

But NASA research into rotor blades made with shape-changing materials could change that view.

Twenty  years from now, large rotorcraft could be making short hops between  cities such as New York and Washington, carrying as many as 100  passengers at a time in comfort and safety.
Routine  transportation by rotorcraft could help ease air traffic congestion  around the nation's airports. But noise and vibration must be reduced  significantly before the public can embrace the idea.

"Today's  limitations preclude us from having such an airplane," said William  Warmbrodt, chief of the Aeromechanics Branch at NASA's Ames Research  Center in California, "so NASA is reaching beyond today's technology  for the future."
The piezoelectric actuators can change and adapt the rotor blade while in motion. Image Credit: NASA

The  solution could lie in rotor blades made with piezoelectric materials  that flex when subjected to electrical fields, not unlike the way human  muscles work when stimulated by a current of electricity sent from the  brain.

Helicopter rotors rely on passive designs, such as the  blade shape, to optimize the efficiency of the system. In contrast, an  airplane's wing has evolved to include flaps, slats and even the  ability to change its shape in flight.

NASA researchers and others are attempting to incorporate the same characteristics and capabilities in a helicopter blade.

NASA  and the Defense Advanced Research Projects Agency, also known as DARPA,  the U.S. Army, and The Boeing Company have spent the past decade  experimenting with smart material actuated rotor, or SMART, technology,  which includes the piezoelectric materials.
"SMART rotor  technology holds the promise of substantially improving the performance  of the rotor and allowing it to fly much farther using the same amount  of fuel, while also enabling much quieter operations," Warmbrodt said.

There is more than just promise that SMART Rotor technology can reduce noise significantly. There's proof.

The  only full-scale SMART Rotor ever constructed in the United States was  run through a series of wind tunnel tests between February and April  2008 in the National Full-Scale Aerodynamics Complex at Ames. The SMART  Rotor partners joined with the U.S. Air Force, which operates the  tunnel, to complete the demonstration.

SMART rotor hub set up for testing in the 40- by 80-foot wind tunnel at NASA's Ames Research Center. Image Credit: NASA

A  SMART Rotor using piezoelectric actuators to drive the trailing edge  flaps was tested in the 40- by 80-foot tunnel in 155-knot wind to  simulate conditions the rotor design would experience in high-speed  forward flight. The rotor also was tested at cruise speed conditions of  124 knots to determine which of three trailing edge flap patterns  produced the least vibration and noise. One descent condition also was  tested.

Results showed that the SMART Rotor can reduce by half  the amount of noise it puts out within the controlled environment of  the wind tunnel. The ultimate test of SMART rotor noise reduction  capability would come from flight tests on a real helicopter, where the  effects of noise that reproduces through the atmosphere and around  terrain could be evaluated as well.

The test data also will  help future researchers use computers to simulate how  differently-shaped SMART Rotors would behave in flight under various  conditions of altitude and speed.

For now that remains tough to do.

"Today's  supercomputers are unable to accurately model the unsteady physics of  helicopter rotors and their interaction with the air," Warmbrodt said.  "But we're working on it."





soure: nasa.gov

Posted at 03:11 am by dravid
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