At present, the gear transmission devices in China's nuclear power, wind power and other large-scale energy devices mainly rely on imports. The design and production of domestic gear devices cannot meet the requirements for the use of large-scale energy devices such as nuclear power and wind power. Therefore, research on gear transmissions in large-scale energy devices such as nuclear power and wind power will help accelerate the autonomy of China's large-scale energy equipment technology and accelerate the construction of large-scale energy installations in China.
Fuzzy Reliability Design Reliability design is a problem that deals with the randomness of design variables, and then gives the probability that parts will not fail. Reliability, but there is ambiguity in the failure criteria of some parts. In this case, it needs to be solved by fuzzy mathematics. Fuzzy mathematics is a mathematics created by American cybernetician Professor LAZadeh in 1965. It also compensates for the shortcomings of deterministic mathematics. The reliability obtained by combining fuzzy mathematics with reliability theory is fuzzy reliability, which is actually the result of mutual penetration between fuzzy mathematics and probability theory, so that the calculated reliability results of parts are more in line with the actual situation.
In the domain U, if X is a continuous random variable, f(x) is its probability density, and fuzzy subset A represents a fuzzy event, then according to the definition of the fuzzy random event probability [4], the probability of the fuzzy event is: P(A)=Q]-]LA(x)f(x)dx(1) where: LA(x) membership function refers to the degree of membership in the intermediate transition zone that is fully permitted to be completely unusable. The law of change.
The membership function of each fuzzy constraint should be determined according to the nature of the constraint and the specific design requirements. In the mechanical reliability design, the household ladder often adopts the membership function of the ring type, such as the subordinate function of the lower half rectangle, the lower half trapezoid, the lower half normal and the lower half of the west distribution. The half-trapezoidal membership function is used in this paper.
The main failure modes of gear transmission are tooth surface pitting and gear tooth bending. The distribution law of contact stress and bending stress is still dissent, and the contact stress and bending stress obey the normal distribution law.
Description :
Our feather flags is one kind of Beach Flags .Its shape like Knife or Feather ,or Aero ,Blade ,Mistral or Sirocco .
Our common material for feather flags is 100% 110 g or 135 g knitted fabric with digital printing or dye sublimation printing . Single side printing or double sides printing .
Our feather flags are supplied with a choice of bases, making them extremely versatile and easy to install ,in any position. Base choices include: water holding base ( for indoor or outdoor use ), ground stake ( for outdoor soft ground use) or a drive - on car foot ( for outdoor use on hard ground ).
Size list of our feather flags :
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Glass Fibre Poles + Aluminum Poles |
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Rod total height |
2.8 meter (9.2feet ) |
3.4meter (11.1feet ) |
4.5meter(14.77feet ) |
5.5meter (18.0feet ) |
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Flag size |
50*200cm |
60*240cm |
70*340cm |
80*410cm |
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Vertical Height |
260cm |
300cm |
400cm |
500cm |
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Glass Fibre Rods |
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Rod total height |
300CM (9.84 feet) |
400CM (13.13ft) |
500cm (16.4 feet) |
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Flag size |
65*210cm |
75*320cm |
80*420 cm |
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Vertical Height from floor |
280cm |
360cm |
450cm |
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Our Feather Flag Shape :
1. Feather Flag Convex
2. Feather Flag Straight
3. Feather Flags Concave :
The difference between glass fibre poles + aluminum poles and full glass fibre rods :
The first one ,just the top part pole is gass fibre ,so it can be bent
The second one is full glass fibre rods from bottom to top .This quality is much better ,because this material is soft and can be bent
The printing tech for our feather flags :
1) Digital printing
2) Dye sublimation printing ( hot transfer printing ) --- this quality is much better than digital printing
The base for our feather flags to choose :
For final price with complete accessories ,please contact with Angelina
(whatsapp : 0086 13427921037 )
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