-
21 stress
- stress
- n1. (внутреннее) усилие, внутренняя сила
2. (механическое) напряжение
3. нагрузка на единицу площади, интенсивность нагрузки, удельная нагрузка
stress acting away from the joint — усилие ( в элементе фермы), действующее от узла
stresses arising from bending and axial loading — напряжения, возникающие от поперечного изгиба и действия продольных сил
stress constant across the section — напряжение, постоянное по всему сечению
stress due to prestress — усилие обжатия бетона; напряжение в бетоне, вызванное обжатием
stresses due to wind forces — напряжения от сил ветра, напряжения от ветровой нагрузки
stresses induced by loads — напряжения, вызванные нагрузкой [нагружением] ( в отличие от температурных напряжений)
stress in reinforcement — напряжение [усилие] в арматуре
stresses in truss components [in truss members] — усилия в стержнях [элементах фермы]
stress resolved into two components — напряжение, разложенное на две составляющие
stress varying from point to point — напряжение, меняющееся от точки к точке ( сечения элемента)
stresses with the elastic limit — напряжения, не превышающие предела упругости; напряжения в упругой области
- actual stress
- additional stress
- allowable stress
- allowable unit stress
- alternate stress
- anchorage bond stress
- average stress
- axial stress
- bar stress
- bearing unit stress
- bearing stress
- belt stress
- bending stress
- bending failure stress
- biaxial stress
- blow stress
- bond stress
- bottom-chord stress
- boundary stress
- breaking stress
- buckling stress
- calculated stress
- circumferential unit stress
- circumferential stress
- combined stresses
- combined bearing, bending, and shear stresses
- combined shear and bending stress
- compression stress
- compressive stress in bending
- concentrated-load stress
- constant stress
- crack-inducing stress
- crippling stress
- critical stress
- crushing stress
- cycle stress
- dead load stress
- design stress
- development bond stress
- deviation stress
- deviator stress
- direct stress
- drying shrinkage stresses
- dynamic stress
- edge stress
- effective stress
- equivalent stress
- erection stress
- extreme fiber stress
- extreme stress
- failure stress
- fatigue stress
- fiber stress
- final stress
- flexible stress
- floor stress during operation
- floor stress when climbing
- flow stress
- fluctuating stresses
- fracture stress
- freezing stresses
- gravity stress
- handling stresses
- high localized stresses
- hoop stress
- hydrostatic stress
- ideal main stress
- impact stresses
- initial stresses
- intergranular stress
- intermediate principal stress
- jacking stress
- larger principal stress
- limiting stresses permitted in the standard
- linearly varying stresses
- live-load stress
- local stresses
- local bond stress
- longitudinal stress
- main stress
- maximum stress
- maximum allowable stress
- maximum shearing stress
- mean stress
- mean cycle stress
- mean fatigue stress
- membrane stresses
- meridian stress
- negative normal stress
- neutral stress
- normal stress
- octahedral normal stress
- octahedral shear stress
- peak stress
- permissible stress
- plate stresses
- point-load stress
- positive normal stress
- primary stress
- principal stresses
- principal tensile stress
- proof stress
- proof stress at 0.2 percent set
- pulsating stress
- radial stress
- radial shearing stress
- reduced main stress
- reinforcement stress
- repeated stress
- residual stress
- reversed stress
- rupture stress
- safe stress
- secondary stresses
- service stress
- settlement stresses
- shear stress
- shear stresses on oblique planes
- shear buckling stress
- shearing stress
- shrinkage-related stress
- shrinkage stress
- smaller principal stress
- spherical stress
- splitting tensile stress
- static stress
- surface stress
- tangential stress
- temperature stress
- temporary stress
- tensile stress
- tensile stress due to bending
- thermal stress
- timber stresses
- time-dependent stress
- top-chord stress
- torsional stress
- total stress
- transverse bending stress in flange
- true stress
- truss stresses
- truss stresses determined by method of sections
- twisting stress
- ultimate stress
- ultimate shear stress
- ultimate tensile stress
- unit stress
- unit stress produced by design loads
- unrelieved stress
- working stress
- yield stress
Англо-русский строительный словарь. — М.: Русский Язык. С.Н.Корчемкина, С.К.Кашкина, С.В.Курбатова. 1995.
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22 primary switch mode power supply
- импульсный источник электропитания с коммутацией тока на первичной стороне
импульсный источник электропитания с коммутацией тока на первичной стороне
-In primary switch mode power supplies, the AC mains voltage is first rectified and smoothed and then chopped ("switched"). Chopping means that the DC voltage is switched periodically at a frequency of 40 to 200 kHz using a power transistor.
In contrast to linearly regulated power supplies, the power transistor does not act as a variable resistor but as a switch instead. This generates a square-wave AC voltage that is transformed to the secondary circuit using a high-frequency transformer. In the secondary circuit, the voltage is rectifi ed and smoothed. The quantity of energy transformed to the secondary circuit is controlled, depending on the load, by varying the chopping rate. The longer the transistor is conductive, the higher is the quantity of energy transformed to the secondary circuit ( pulse width modulation).
Due to the use of high-frequency AC voltage, primary switch mode power supplies have the decisive advantage that their transformer can be of much smaller size than required for the transformation of low frequencies. This reduces the weight and the dissipation inside the unit. The effi ciency of these units is between 85 and 95 %. Since the output voltage does not directly depend on the input voltage, these units can be used for a wide input voltage range and can even be supplied with DC voltage. Furthermore, it is possible to buffer short-time mains voltage breakdowns up to 200 ms. However, the power failure buffering time is limited by the size of capacitor C1 since a longer buffering time requires a higher capacity and thus a bigger size of the capacitor. Especially in case of small power supplies this is not desirable.
Therefore, a practicable compromise has to be made between the size of the power supply and the buffering time.
Primary switch mode power supplies can be used for all purposes. For example, they are suitable for the supply of all kind of electronics as well as for electromechanical applications.
[ABB]Тематики
EN
Англо-русский словарь нормативно-технической терминологии > primary switch mode power supply
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