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Message 21352 - Posted: 29 Apr 2017, 22:15:46 UTC
Last modified: 29 Apr 2017, 22:22:29 UTC

Hi folks. Last year, you guys helped analyze results from the Planck satellite by having your computers comb through millions of simulations of our universe, to help us understand if some curiosities in the Planck data were just statistical flukes, or if they were hints of a new discovery. In a bit more detail, the science behind these jobs was described here, and your results allowed us to write a paper which explored these questions (which we'll summarize in a future post). Along the way we also had a contest for who contributed the most computing power to these jobs, and we ultimately thanked winners MaDdCoW, 25000ghz[Lombardia], Rally1965 and team BOINC.Italy in the paper.

For those that aren't familiar with the way publication works, first a paper is submitted, then a referee replies with comments and requests for revisions, then the authors respond and the paper is eventually accepted or rejected. This is the stage we're currently in now, working on this response. As part of the response, it would be useful to analyze some more simulations, so starting today and continuing at least for a few weeks, we'll be adding back a bunch more Planck jobs.

Thanks again to all who contribute and happy crunching!
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Message 22888 - Posted: 8 Nov 2021, 9:12:09 UTC - in response to Message 21352.  

What is the difference between a toothed washer and a serrated washer?

Disc springs and baylor, spring washer, was invented by the French baylor, and its conical disk, can be either a single use, and can use multiple series or parallel, in and around the outer edge points along the axial effect under static or dynamic load, deformation after compressed, flattened, in the form of stored energy as live load. When necessary, it is automatically converted to additional compression loads required for sealing to reduce the continuous tightening requirements in the use of gaskets and packing.The disc spring is a special spring that is conical in the axial direction and bears the load. After bearing the load deformation, it saves a certain potential energy. When the bolt loosens, the disc spring releases part of the potential energy to maintain the pressure between the flange connections to meet the sealing requirements. The stress distribution of disc spring decreases evenly from inside to outside, which can achieve the effect of low stroke and high compensation force.


Toothed gasket:
Generally, a precision lathe is used to process the two sides of a metal stainless steel flat gasket into concentric grooves. According to different media, flexible graphite, PTFE, non-asbestos board or some other soft metal can be selected and pasted on the two sides of the gasket. It can also be used directly without a sealing layer, and can achieve a good sealing effect, but it is easy to cause loss to the surface of the flange in high-pressure occasions.
Toothed gaskets generally have two types: 1. Toothed gaskets with locating rings for flat flanges 2. Toothed gaskets without locating rings for concave-convex flanges.
Application of tooth-shaped gasket: The tooth-shaped combination gasket is the first gasket to be used under low preload. The soft sealing layer avoids direct metal-to-metal contact, and can be reliably and tightly combined to protect Metal flanges are not damaged, even under extremely high loads. Tooth-shaped composite gaskets are especially suitable for high temperature, high pressure, and alternate working conditions. They are ideal substitutes for traditional metal-clad gaskets at the flange joints of heat exchangers, vessels, and reactors.
1. Performance and Features
1. Suitable for high temperature and high pressure parts
2. Strong corrosion resistance
3. The sealing effect is stable and reliable
2. Use range and parameters
1. Operating temperature: ~650℃
2. Working pressure: 6.4~25.0MPa
3. The minimum preload specific pressure: y=70MPa
4. Gasket factor: m=4.25
Compared with the serrated safety washer and the toothed washer, the application of the two can be said to be very different. The main purpose of toothed gaskets is corrosion-resistant and stable and reliable sealing, while the main purpose of serrated gaskets is for locking.
The serrated safety washer is a spring disc spring with a trapezoidal cross section and serrated springs on both sides. Serrated safety washers are connected with bolts or screws to increase friction resistance and prevent bolts from slackening after vibration.
The serrated washer is the same as the serrated washer and there are two types: one is the inner serrated washer and the other is the outer serrated washer. The main function of both is to use serrations to occlude the threads or to prevent loosening and locking by the fastening surface.
There is also an anti-slip washer with double-sided teeth, which is also anti-slip and anti-slip.
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Forums : News : Planck satellite analysis part 2