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AMRC signs agreement with National Research Council of Canada to develop novel composites for aerospace

AMRC signs agreement with National Research Council of Canada to develop novel composites for aerospace published on


The University of Sheffield’s Advanced Manufacturing Research Centre (AMRC) has signed a collaborative research agreement with the National Research Council of Canada in a ceremony that took place at the Canadian High Commission in London.

The Memorandum of Understanding (MoU) agreement is to develop novel composites for aerospace and is the first project under the broader CAN-UK science, technology and innovation research partnership.

The objective of the complete two-phase research project is to develop the analysis methods and manufacturing knowledge required to design and produce optimised curvilinear variable stiffness laminates fabricated by Automated Fibre Placement (AFP) and demonstrate application of the technology on a representative civil aircraft structure

Professor Keith Ridgway, Executive Dean of the AMRC, said: “We are delighted to have the opportunity to work with our academic colleagues in Canada and look forward to a long and fruitful relationship.”

As well as the AMRC and NRC, additional project partners will be required for phase two onwards. Industry partner involvement will ensure the technology and specific applications being developed are directly relevant to near-future aero-structures.

Fran?ois Cordeau, Vice President of the Transportation and Manufacturing Division of the National Research Council of Canada, said: “Manufacturing makes up nearly half of Canada’s aerospace sector. The NRC is excited to work with the global aerospace industry by collaborating with the University of Sheffield on advanced manufacturing methods for cost-effective and environmentally-friendly aircraft.”

It was announced in the same week as the UK Research and Innovation (UKRI) and NRC signed a Memorandum of Understanding to facilitate the delivery of collaborative, jointly-funded research and innovation programmes.

Manufacturing principle of anti-static high temperature cloth and the static harms

Manufacturing principle of anti-static high temperature cloth and the static harms published on

The graphite is added to the anti-static high temperature cloth in order to make the high temperature cloth appear black, and the anti-static agent is added so that the anti-static coefficient of the high temperature cloth reaches 106. The manufacturing principle: adding graphite and anti-static agent in the manufacturing process, making the material called anti-static material or conductive material, its excellent electrical conductivity makes it widely used in electronics industry, plastic industry, textile industry, printing industry, etc. .

Manufacturing principle of anti-static high temperature cloth and the static harms

Static harms

1. Electronics industry: adsorption of dust, breakdown of integrated circuits and precision electronic components, or aging components, reducing production yield; causing malfunction or malfunction of electronic equipment, causing electromagnetic interference; small charge can damage semiconductor components, most components on the device can be damaged with less than 1000 volts, and some can be damaged below 10 volts.

2.High-voltage electrostatic discharge causes motor to endanger personal safety.

3.Explosions and fires are easily caused in places where flammable or explosive materials or dust and oil mist.

4.Film and plastics industry: shrinking film which affecting quality.

5.Paper printing industry: paper winding is not uniform, overprinting is not allowed, serious suction, even paper bonding.

6.Textile industry: causing the roots to flutter, the yarn entanglement and other harms.

How to use Teflon tape? Teflon tape use steps

How to use Teflon tape? Teflon tape use steps published on

PTFE Teflon tape has a smooth surface, good anti-adhesion, chemical and high temperature resistance and excellent insulation properties. It is widely used in packaging, thermoplastic, composite, sealing and sealing, electrical and electronic industries. Fabric-reinforced PTFE Teflon tape is more powerful.

Teflon tape use steps

1. Clean the surface of the drying cylinder that needs to be taped, pay attention to the surface without iron filings, and the surface is smooth.

2. Cut the tape longer than the required length (about 5 cm longer than the required length).

3, tear off the release paper, pay attention to tearing the edge paste, do not tear all at once, in the process of the paste can be used a piece of cloth (or newspaper) on the tape to flatten the friction, after the tape is finished to ensure both sides of the tape Rejoined together.

4. In the middle of the overlap of the tape, use a utility knife to draw a straight line (the length of the drying cylinder), tear off the A (as shown) with tape and open

5, after the Teflon tape is attached, carefully check whether there are small bubbles between the tape and the drying cylinder. If there is, you can use a sharp object such as a pin to exclude small bubbles, and flatten the tape at the B to tear off Tape at C, and finally stick B, and flatten the tape at B and D.

The effect analysis based on ADAMS Teflon conveyor chain polygon

The effect analysis based on ADAMS Teflon conveyor chain polygon published on

Car interior pieces including the car roof and interior carpet, its production line as Figure 1 by shows, which conveying track part used special fluoride Dragon with form, car roof and car carpet by with material for GFP Board or MA felt board, size: 2650mm*1700mm (long * wide), weight 900~1400g or 1500~1900 a, transfer device maximum transfer trip 7200mm, transfer speed range: 300~600 mm/s, it guarantee transfer device stable speed 500 mm/s. Teflon transmission requires dynamic stability, large power, carrying load adaptability is strong, and can be applied to high temperature working environment.

The line high speed feeding system adopts chain drive, not Teflon belt transmitting power. Due to chain drive inherent in the polygon effect, will make an impact on chains and sprockets, vibrate and periodic variation of speed and noise, it will affect the chain drive and big implications for the normal production.

In order to study the polygon effect of chain drive that Teflon belts work, determining their impact factor, aiming at the sprockets and chain gearing mechanisms, modeling and simulation with SolidWorks software, can directly reflect the movement of the chain, finally into ADAMS for simulation, simulation results can be used in Teflon belt optimized design of chain drive.

Polygon effect
As shown in Figure 2, chain and sprocket contacts could not completely meet the sprocket pitch trajectory.
From a geometrical point of view, positioning sprocket radius R, chain and sprocket after chain angle θ from a match turned, theory of displacement as: St= Rθ
Wheel rotation actually make up circular motion meshing with the chord movements alternating movements, chain movement phase linear displacement is equal to the string on the sprocket pitch cogging chord length, namely: Sf= 2sinθ/2R
The deviation of St and Sf is defined as ΔX=St-Sf.
This phenomenon is the chain drive sprocket polygon effect.

Chain sprocket Assembly modeling and motion simulation
Chain uses 16A double row of chain and the size standards adopted GB/T1243-1997, the chain track by automobile roof line, teflon conveyor belt slewing mechanism as a template, assembly molding.

Using SolidWorks to create whole body trajectory model (see Figure 3a). In order to simplify the model, set up Rotary sprocket pitch 98.13mm-Agency, inner-60.96mm. Swivel included both 180 ° and 90 °.

Finally build constraint for add drive sprocket wheel, keep the sprocket angular velocity is 10 ° / s, the movement simulation results was observed.

When the number of sprocket teeth less than 13, asymmetry and carries the load of the movement increased, as shown in Figure 4, the sprocket tooth number 12 when the dynamic load effects significantly greater than 15 of the sprocket teeth transmission. Gear transmission ratio unchanged when greater than 25 cases structure overall size is too large, do not conform to the actual application. Sprocket chain motion non-uniformity besides is directly related to the sprocket teeth, also is related to the sprocket center distance.

In order to analyze in detail the change of the load effect of the polygon effect in chain drive,the detailed data model is established, the above established SolidWorks model is simplified to single driving wheel driven wheel drive, the chain still USES 16 a double row of chain structure (as shown in figure 5).Due to the complexity of chain transmission model, kinematic and dynamic analysis was carried out on the chain, to simplify the analysis model. To simplify the SolidWorks model definition, processing with imported ADAMS software.

ADAMS polygon effect analysis
Chain drive model simplification and assumption
Teflon conveyor belt with chain drive of this paper is very complex, it is difficult to direct modeling in dynamic simulation software ADAMS, so using SolidWorks models have become a Parasolid file and then transfer to ADAMS. In the Parasolid file transfer process, the model information is lost (such as datum points and Datum coordinate systems, and so on). In addition, the simulation must be all new Marker in ADAMS, while dealing with a contact problem between the entity and entities, directly using SolidWorks models will be complex and long simulation time. Due to too many links, define the spin pair and contact one by one, will use a simplified chain model (see Figure 5).

According to the different location of interaction between link and sprocket, it is divided into three regions as shown in figure 6, and model reduction. Due to region a chain sprocket tooth contact at first, will have a relative velocity, resulting in a larger impact and dynamic load, and the contact force is relatively large. This part link have most influence on the dynamic characteristics of the system, it cannot be simplified. In area B, chain and sprockets continuous contact, in the steady-state phase, should be simplified. Regional chains in the C section, contact force is small, it also simplified.

To speed up the simulation process in ADAMS simulation model considers only rotating friction between the chain and does not take into account other friction, skidding and air resistance, and so on. The simulation results show: dynamic characteristics of simplified models in the analysis remain essentially the same as the original model, this model is reasonable. The model effect of ADAMS as shown in Figure 7.

Simulation results analysis
Figure 7 shows the model simulation analysis, Figure 8 describe a changes curve that a chain section from tight side NIE into to NIE out active round process in the contact force, it reflect superior contact force which only in near tight side of several chain section, chain section of location more near Pine side is contact force more small and reduced range is big, while showed that model simplified reasonable.

Here in the center line of the chain lower rate to measure the amount of fluctuation in sprocket and chain polygon effect of reduction is:
η=λ-ζ/λ*100%

In the formula: λ=p/2(1/sin(z/π))-(1/tan(z/π)),ζ is actual volatility, p is chain pitch.
Figure 9 respectively traditional linear tooth profile sprocket drive wheel in three critical speed 5 ° / s, 10 ° / s, 15 ° / s chain plate center of vertical center line change curve.

Figure 9 shows that changing chain plate center, in a fluctuating state, by observing the center of the chain plate can get chain fluctuation changed circumstances. Figure 10 depicts the 1 ~ 15 ° / s chain fluctuation quantity change trend.

Figure 11 is when 5 ° / s and 15 ° / s,the over time variation diagram of two drive meshing impact results.

When the tooth profile of the sprocket is different, the magnitude of the meshing impact force also changes. Figure 12 shows that, with the increasing of speed, increasing the impact between the chain and sprocket.

Conclusion
Teflon conveyor belt is studied in this paper with a chain of citations, the structure design and calculation of chain drive, primarily chain and sprocket selection, etc. In accordance with the chain transmission structure and components in SolidWorks establish digital model, and analyze the polygon effect theory. Finally will simplify the SolidWorks model into ADAMS, modeling, add motion pair and get after motion dynamics simulation model, simulation results help chain polygon effect after optimization design. Commonly used composite tooth profile sprocket, etc to minimize driven wheel angular velocity fluctuations, reduce the polygon effect.