http://www.youtube.com/watch?v=laSQ6yd7jaE
http://rimstar.org/
http://www.youtube.com/watch?v=Eam1-9FDD-Y
http://www.youtube.com/watch?v=dwxtVcZh6ck&feature=related
http://www.linear.com/company/investor/
http://www.youtube.com/watch?v=MGDHaIMgmH8&feature=related
http://www.linear.com/product/LTC3588-1
http://cds.linear.com/docs/Datasheet/35881fa.pdf
http://www.youtube.com/watch?v=YFITXmzB9EI&feature=related
http://www.youtube.com/watch?v=E1Ct3VUWvhQ&feature=related
http://www.youtube.com/watch?annotation_id=annotation_453159&src_vid=E1Ct3VUWvhQ&feature=iv&v=R9m79oWdOZI
maandag 23 april 2012
donderdag 19 april 2012
Eco-tegels
The Ecotile addresses the need to develop sustainable self-sustaining energy sources for the future. The concept targets busy public spaces (sidewalks, metro stations, airports, etc.) where thousands of people frequent everyday. The force applied on the walking area by the human body is immense, with the average human weighing approximately 65kg (50th percentile male-female combined average). This force applied on each day on each 20cm sq. surface area even a thousand times during the course of the day is normally wasted human energy.
The Ecotile uses this pressure constantly applied on surfaces to generate electricity that can be used to power street lights, traffic lights, building interior lighting, etc. The Ecotile uses the concept of piezo-electricity generation to achieve this.
Piezoelectricity (from: pressure electricity) is a property of certain classes of crystalline materials including natural crystals of Quartz, Rochelle Salt and Tourmaline plus manufactured ceramics such as Barium Titanate and Lead Zirconate Titanates (PZT).
When mechanical pressure is applied to one of these materials, the crystalline structure produces a voltage proportional to the pressure. Conversely, when an electric field is applied, the structure changes shape producing dimensional changes in the material.
The piezoelectric materials for the Ecotile use polycrystalline ceramics These are versatile with physical, chemical and piezoelectric characteristics able to be tailored to specific applications. The hard, dense ceramics can be manufactured in almost any given shape or size. They are chemically inert, and immune to moisture and other atmospheric conditions.
The Ecotile pressurizes a piezo-electric material when walked on. This causes the release of current, which is small, but with repeated releases, stored in a battery over a period of time can produce enough power for purposes such as street lighting, etc.
The Ecotile surface can be tailored for specific spaces and can range from clay to non-abrasive plastics, depending on the need. The lower half of the tile is tapered so that it concentrates pressure on the piezo-electric material and also makes the tile structurally stronger. The piezo-electric material is housed in a protective casing and is approximately 3 cm square in dimension, thick enough not crack under constant pressure.
The apparatus is attached to a base plate, which is rooted to the foundation of the road surface. The tile surface is supported by a set of four highly durable impact resistant springs, which ensure that the tile moves perpendicularly downwards no matter on which part of the surface the force is applied. The springs also ensure that the piezo-electric material is only pressurized when a person walks on it, hence the action being more “striking” than “pressing”, a process which generates a greater discharge. An internal voltage terminal and wiring system between the tiles carries the charge to the charging battery.
The Ecotile can be laid in rows like a normal tile, with a reinforcing material in between the tiles, which protect the tile from water and dust, though all the internal components in the tile will have to be weather-resistant. The Ecotile does not hinder the normal walk cycle as the tile only recesses by 2mm when walked on.
In case an Ecotile needs maintenance, bolts on the top of the surface can be opened to provide access to the internal components without any masonry work required.
The Ecotile is only in a concept stage at the moment, and one can only specify the exact nature of the materials and working after a through development stage is undergone. Piezo-electric materials are expensive, but if mass-produced for such an application, may be economical in the long run. If successful however, it would be successful in using human energy otherwise wasted and would be a small step towards a more eco-friendly and self-sufficient human race.
The Ecotile uses this pressure constantly applied on surfaces to generate electricity that can be used to power street lights, traffic lights, building interior lighting, etc. The Ecotile uses the concept of piezo-electricity generation to achieve this.
Piezoelectricity (from: pressure electricity) is a property of certain classes of crystalline materials including natural crystals of Quartz, Rochelle Salt and Tourmaline plus manufactured ceramics such as Barium Titanate and Lead Zirconate Titanates (PZT).
When mechanical pressure is applied to one of these materials, the crystalline structure produces a voltage proportional to the pressure. Conversely, when an electric field is applied, the structure changes shape producing dimensional changes in the material.
The piezoelectric materials for the Ecotile use polycrystalline ceramics These are versatile with physical, chemical and piezoelectric characteristics able to be tailored to specific applications. The hard, dense ceramics can be manufactured in almost any given shape or size. They are chemically inert, and immune to moisture and other atmospheric conditions.
The Ecotile pressurizes a piezo-electric material when walked on. This causes the release of current, which is small, but with repeated releases, stored in a battery over a period of time can produce enough power for purposes such as street lighting, etc.
The Ecotile surface can be tailored for specific spaces and can range from clay to non-abrasive plastics, depending on the need. The lower half of the tile is tapered so that it concentrates pressure on the piezo-electric material and also makes the tile structurally stronger. The piezo-electric material is housed in a protective casing and is approximately 3 cm square in dimension, thick enough not crack under constant pressure.
The apparatus is attached to a base plate, which is rooted to the foundation of the road surface. The tile surface is supported by a set of four highly durable impact resistant springs, which ensure that the tile moves perpendicularly downwards no matter on which part of the surface the force is applied. The springs also ensure that the piezo-electric material is only pressurized when a person walks on it, hence the action being more “striking” than “pressing”, a process which generates a greater discharge. An internal voltage terminal and wiring system between the tiles carries the charge to the charging battery.
The Ecotile can be laid in rows like a normal tile, with a reinforcing material in between the tiles, which protect the tile from water and dust, though all the internal components in the tile will have to be weather-resistant. The Ecotile does not hinder the normal walk cycle as the tile only recesses by 2mm when walked on.
In case an Ecotile needs maintenance, bolts on the top of the surface can be opened to provide access to the internal components without any masonry work required.
The Ecotile is only in a concept stage at the moment, and one can only specify the exact nature of the materials and working after a through development stage is undergone. Piezo-electric materials are expensive, but if mass-produced for such an application, may be economical in the long run. If successful however, it would be successful in using human energy otherwise wasted and would be a small step towards a more eco-friendly and self-sufficient human race.
P2
| Description of Design | |
 | Imagine a garment that could harness the energy of body movement and thermal differences, and have the added benefit of temperature control and vitals monitoring. Such a garment could be created from the P2 textile – a thread born of two primary technologies currently in development: the piezoelectric and Peltier effects of certain metals. At its core, the P2 textile is essentially a flexible, linear Peltier chip made of two dissimilar piezoelectric metals, wrapped in a sheath of thermally conductive material lined with electrically conductive fibers. An elastomer embedded with electronic ink encases all of the metals and conductors, resulting in a ribbon-like thread about two millimeters in width. The flat P2 thread can be woven into patches that can perform a number of functions resulting from the unique relationship it shares with the human body. Movement of the garment by the body creates and electrical current due to the properties of piezoelectric metals. A special seam along the patches edge interfaces with the conductance layer, while also attaching a traditional textile boarder. If a small computer were to be connected to the interfacing seam, the piezoelectric portion of the patch could be used to extrapolate pressure zones. This phenomenon would allow for control buttons that would be displayed on the garment via the embedded electronic ink. Such controls as temperature adjustment and power usage could be displayed along with other possibilities, such as maps or camouflage patterns. The thermal difference between the wearer of a P2 garment and his or her ambient environmental temperature also creates a current – the greater this difference, the more electrical output. This aspect of the P2 thread is why it is ribbon-like instead of round – there must be two differentiated sides for the Peltier effect to work. The electronic ink on the outside of the garment can also be used to regulate the best contrast to maximize the performance of the thread. Providing power to the P2 patch would result in either heating or cooling the wearer, depending on the polarity of the DC current. In this mode, however, the garment would become slightly stiffer, due to piezoelectric metals attempting to straighten with the addition of power. Attached controls could allow for automatic temperature control for specific regions of the body utilizing other, attached garments. The attachment interface would be a regular-looking snap, but would allow for additional controls, batteries or even flexible solar panels. A P2 garment would most likely be worn as a second layer, over a performance athletic under shirt. Some examples of users could be soldiers, firefighters, or inside bio-suits or space suits. It would not have to be cleaned as often as other garments, but it could be machine washed once all snapped-on attachments were removed. The snap itself prevents shorting, so when it is not attached to anything the power generated by the movement simply causes one side to get warm and the other to get cool. 
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Piezo motor - Wave
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PiezoWave®The PiezoWave® was originally developed for applications withinhandheld consumer electronic devices such as mobile phones, but the product is now being integrated into many other applications, including other handheld devices, consumer electronics, medical technology applications, electromechanical door locks, advanced toys, cameras etc. For further technical details please download data sheet and general information below. In the case you are looking for customized versions please fill in the Motor Inquiry form. You are also welcome to contact us or our distributor in your area.
DownloadsBelow you will find PiezoWave® technical documentation.Please feel free to download! PiezoWave® Brochure with general information (PDF 376) > PiezoWave® Demo Kit Instruction Manual (PDF 136K) > PiezoWave® Technical information (PDF 220K) > |
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Cornell onderzoek
Flapping Piezo-Leaf Generator for Wind Energy Harvesting
Project Member: Shu-guang Li, Hod Lipson & Francis C. Moon
Goal:
To investigate the principles and feasibility of the energy harvesting from the wind as it flows around our buildings and other living ambient as an alternative to conventional rotary wind turbines.
Details:
We designed a wind energy harvesting device "Piezo-Leaf Generator" by piezoelectric materials. On considering of the unpredictable wind strength and the diversely outdoor ambient, we chose the flexible piezoelectric materials, Polyvinylidene Fluoride (PVDF), as the basic component of device. The idea is to fix a piece of PVDF film on the backside of a cylinder bluff body, when the wind cross this bluff body, it will lead a vortex shedding, then the periodic pressure difference from the periodically shedding vortex could drive the Piezo-Leaf to be bending in the downstream air wake, synchronously, we collect the AC signal from the flapping Piezo-Leaf which is working on a periodic bending model, and store the electric energy to capacitor or other storage after rectifying it by a full-wave bridge.
However, because of the weak piezoelectric strain coefficient of PVDF, the preliminary Piezo-Leaf Generator’s power level was just about 100 pW, after a 2 cm diameter circular cylinder in 4.5 m/s wind, honestly, which is far away from being able to drive our light of office. Then, we tried to attach a piece of plastic film to the end of leaf along the direction of air flow, which showed about 100 times increase of power in the same condition. After that we had done a series of experiments of attachments in various shape, area, density and flexibility by a group of plastic and polymer film, then we found some totally differences in these results.
To simply treat the flapping structure as a vortex inducing pendulum-cantilever aero-elastic coupled system, the various kinds of attachments could induce the difference of mass distribution, vortex inducing force and moment. Furthermore, we had finished a series experiments about the bluff body, we found the size and shape aspects could also impact the level of power, which should be caused by the changes of wake strength and vortex shedding frequency.
Promisingly, we have been pursuing more experiments to analyze the data and optimize the structure of single Piezo-Leaf Generator in order to maximize output power. For practical application, we will build plant-like devices with hundreds or thousands of the Piezo-Leaves, like ivy, tree and forest.
Demo:
Publications:
Li S., Lipson H., (2009) " Vertical-Stalk Flapping-Leaf Generator For Parallel Wind Energy Harvesting", Proceedings of the ASME/AIAA 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS2009.
Li, S., Yuan, J., and Lipson, H.(2011) "Ambient wind energy harvesting using cross-flow fluttering", Journal of Applied Physics, 109, 026104.[Online supplemental materials].
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