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Piezo-actuation and PIEZOMECHANIK

3/3/2009 · Kategori: TEKNOLOJI

Piezo-actuation based on discretely stacked high voltage multilayer elements has been introduced end of the Sixties as a remotely acting superfine adjust for optical components. Especially coherent optics and here the up-coming laser – technology were the main trigger. To introduce this new technology. In so far, optics can be designated as the “mother of multilayer-based piezo actuation”. The first stack actuators were high voltage type for driving voltages typically up to 1000V built up from standard PZT components like discs or plates bonded by adhesives.
The next very important step towards a broader application of piezo-actuation was the introduction of so-called co-fired monolithic piezo-elements . This step was done end of the Seventies.By this technology small-sized actuators for low voltage operation can be produced in larger quantities. At this time, another feature of piezo-actuation besides “super-positioning” came to higher interest: the generation of high forces and large acceleration rates based on the solid state properties of PZT ceramics. A first application was the use as impactors for the needles within needle-impact printers. The needle-printing principle disappeared by time, but another high speed mechanical switching application came up and represents now the larges application volume: the piezo-based fuel injection technology for super-modern Diesel common rail engines.
Currently, there are three main fields of piezo actuation
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Ultra-fast mechanical switching (fuel injection and other valve controls)
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Ultra-precise positioning e.g.in semi-conductor industry / glass fiber technology
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Active vibration control (vibration generation, vibration cancellation, adaptronics)
The professional career of Dr.Lutz Pickelmann as the founder and owner of PIEZOMECHANIK was parallel to the history of piezo actuation: Lutz Pickelmann came into a first contact with piezo actuators as a student, when he was setting up a high resolution Fourier- spectrometer for the near infrared spectrum. The rather difficult requirements for stabilizing the optomechanics of the interferometer were only fulfilled by the use of super-precise electrically controlled piezo-actuators. The technology was an exotic one at this time and the piezo-stacks were self-made. Upon the proposal of Lutz Pickelmann ,a rather exotic application of Fourier-spectroscopy at this time was the investigation of the spectral response of eyes-cells of drosophila-flies. The experiments were then carried out by R. Gemperlein / Institute of Biology / Munich University and H.Parsche / Physics Dept.E14 / Technical University of Munich.
The trend towards highly dynamic piezo actuation was increasingly reflected by PIEZOMECHANIK’s product range. High power frequency tuneable vibration systems are offered as well as high power axial shock generators. The high potential of piezo actuation for ultra-ynamic mechanics is shown by the use of big sized piezo-stacks as shock-generators for chiselling. (in cooperation with Hp.Schad / HILTI / Liechtenstein). Mechanical deformation energy in the Joule range is produced within ultra-short time periods within a few Tens of microseconds. Acceleration rates exceeding 100.000m/sec² have been demonstrated.
High power piezo-actuation is further the topic of various projects in the field of adaptronics. Like active vibration control even of very heavy and bulky structures like car-bodies, air-frames or tooling machines. Beside these main stream activities, PIEZOMECHANIK supports continuously exotic new applications like actuator systems running at cryo temperarture < 4°K e.g. for the dynamic tuning of superconducting resonators for accelerators used for the spallation neutron sources

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ULTRASONİC CONCENTRATİON MEASUREMENT

3/3/2009 · Kategori: TEKNOLOJI

Ultrasonic concentration measurement

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LAND & SEAS DYNOMİTE CHASSİS DYNAMOMETER SYSTEMS COMBİNE

3/3/2009 · Kategori: TEKNOLOJI

FWD/RWD 700+ Hp** chassis
kits include 12" medium inertia
dual-roller assembly, removable roller shield, drive-up ramps, wheel chocks,
casters, water or eddy current absorber with step-up drive, electronic torque
transducer, DYNOmite data-acquisition computer, AC power supply, Electronic
Auto-Load Control, DYNO-MAX 2000� software, inductive RPM pick-up, required
hoses, engine temperature thermistor, and full-function data harness. with dual eddy current absorbers and an electrically adjustable wheelbase system, is
shown in the image at right.)

1,200 to 2,500+ Hp** Pro chassis kits include a FWD/RWD (optional AWD upgrade shown below) tube steel
frame with 24", 30", 44", or 60"
diameter medium inertia rolls, bolt-on diamond plate decking, floor anchors,
wheel chocks, vehicle tie downs, water or eddy current
absorber(s) with step-up drive, electronic torque transducer, DYNOmite
28-channel data-acquisition computer, inductive RPM
pick-up, DYNO-MAX 2000 �Pro� software, printer, Windows XP® equipped Dell�
laptop, mobile computer stand, Electronic Auto-Load Control, Weather Station
Kit, A/F Ratio module, 42" high-volume cooling fan,
hoses, engine temperature thermistor, and full-function data harness.

creates a full vehicle dashboard on your PC. Features include: real-time trace graph display, adjustable limit warnings,
pushbutton controls, user configurable analog and digital gauge ranges, color
graphing, test report database, instant playback, inertia compensation,
�Smart Record�� trigger points, adjustable data dampening, full data import/export, semi-automatic zeroing, voice alarms, wireless Pocket DYNO-MAX� interface,
drag strip Christmas tree console, etc.

DYNOmite Data-Acquisition Computer displays
and records true unlimited Hp, torque, RPM,
elapsed time, etc. at up to 1,000 readings per second (per channel). It will
even automatically apply SAE correction factors for air temperature, barometric
pressure, and relative humidity.

 More than acceleration Hp can be measured with DYNOmite absorption units,
because they utilize an actual strain gauge equipped torque transducer.
Measuring power under a controlled RPM load is vital for proper mapping of
engine management systems and guess-free emissions work. Avoid �dynos� that
simply spin the vehicle�s tires up against their roll�s inertia (�flywheel
resistance�) without having any ability to simultaneously control and measure
absorption load. Rather than measuring the torque, they derive it from the
acceleration (similar to extracting horsepower from drag-strip data). Such units
can not maintain a MPH or RPM setting, while also displaying true torque and Hp
� like a DYNOmite can!

Sustained Hp and top end require an absorption dynamometer (i.e. a DYNOmite system).
Unlike �acceleration spurt� inertial testing, these can load a vehicle
indefinitely.* The absorber allows running controlled RPM step or sweep Hp
tests. Everything is under computer control via the included Electronic Auto
Load.

Simulate driving conditions on your chassis dyno by letting DYNO-MAX and your PC take
control. DYNO-MAX features a �Road Load Simulation� mode that simulates vehicle
momentum, air drag, rolling friction, etc. Enter the vehicle�s weight and drag
data and then allow the software to monitor MPH vs. applied Hp, as it adjusts
the dyno�s road load accordingly. To the car�s driveline and operator, the feel
is like actually driving.

Front, Rear, or All Wheel Drive cars and trucks can be tested on the appropriate
model automotive chassis dyno. Many allow front/rear torque bias monitoring and
bidirectional mounting. Even large bikes and ATVs fit the 700 Hp dual-roller
assembly. We can also convert many other manufacturer�s
older, single axle, chassis dynamometers to AWD, with full Electronic Axle
Synchronization, at a fraction of the cost of a new installation!

Dynamically balanced and machine traction-grooved rollers dramatically limit vibration and tire slip! Test most production
vehicles (up to 150 MPH and 700
Hp) on our smallest automotive dual-roller assembly. Larger diameter roll systems easily handle sustained higher speed testing at
race car power levels.
are approximate, as they are primarily tire safety and traction limited higher torque requires tie downs.)

Fix driveline problems that might never show up in the
garage, like shifting issues, driveshaft vibration,
brake squeal, bearing noises, brake shudder, exhaust rattles, etc. - without
costly field testing.

Verify emissions under load using your existing, or our optional (digitally integrated)
DYNOmite 5-gas, exhaust analyzer. Proper emission testing procedures require
repeatable absorber load control, impossible on simple inertia dynos. No more
trying to use to verify that repaired vehicles are in
emissions compliance. Send customers for state inspections with confidence.

Low profile, ramp loading allows installing the 12" dual-roller units above ground - or
in the driveway. Casters let you roll it to a corner when not in use (just raise
the anti-vibration leveling pads). No dedicated test bay, or digging up floors,
required.

Rapid on-off set-up makes it practical to skip those old time-consuming road trips.
Just drive it on, strap it down, hook up the tach (or
use �Smart Ratio��) and test � a full report
prints out automatically!

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