... state the Vieta’s formulas ? 3- New lesson: Vocabulary Converted into: đưa (dạng) Vieta’s formulas: định lý viet Co-efficient: hệ số Absolute – value bar: giá trị tuyệt đối True roots with every x:...
... for peripheral velocities greater than 20 m / s 0.75 + 0.25, for non-metallic gears 1+ v The dynamic tooth load on the helical gears is given by = WD = WT + 21 v (b.C cos α + WT ) cos α 21 v ... in m / The gears are required to be designed only against bending failure of the teeth under dynamic condition Solution Given : P = 22 kW = 22 × 103 W ; NP = 1800 r.p.m.; NG = 600 r.p.m ; α = ... and factor of safety are 1.5 and respectively Assume that the velocity factor accounts for the dynamic load and calculate [Ans 8.6 kW] the power transmitting capacity of the gears A single stage...
... EG = 84 × 103 N/mm2, we have Deformation or dynamic factor, C = K e 1 + EP EG = 0.107 × 0.055 = 353 N / mm 1 + 210 × 103 84 × 103 We know that dynamic load on the gear, WD = WT + 21 v (b.C + ... satisfactory from the standpoint of dynamic load We have already discussed in spur gears (Art 28.20) that WS ≥ 1.25 WD for steady loads For a satisfactory design against dynamic load, let us take the precision ... gears having tooth error in action (e = 0.015 mm) for a module of mm ∴ Deformation or dynamic factor, C = and dynamic load on the gear, 0.107 × 0.015 = 96 N/mm 1 + 210 × 103 84 × 103 WD = 1364 + 21...
... Check for dynamic load We know that the dynamic load, WD = WT / v = 12 110 / 0.72 = 16 820 N Since this is more than W T = 4260 N, therefore the design is safe from the standpoint of dynamic load ... standpoint of tangential load Check for the dynamic load We know that the dynamic load, WD = WT / Cv = 2825 / 0.93 = 3038 N and power transmitted due to the dynamic laod, P = WD × v = 3038 × 0.452 = ... 20° involute teeth TG The dynamic tooth load on the worm gear is given by = 0.154 − WT 6 + v = WT Cv where WT = Actual tangential load on the tooth The dynamic load need not to be calculated...
... written in small letters except the symbol derived from the proper names For example, N for newton and W for watt The units with names of the scientists should not start with capital letter when ... latitude has been adopted as one force unit and named as one kilogram of force Thus, it is a definite amount of force But, unfortunately, has the same name as the unit of mass The weight of a body ... Mass density ρ kg/m3 Force, Weight F, W Pressure Work, Energy, Enthalpy Power 10 Absolute or dynamic viscosity µ N-s/m2 11 Kinematic viscosity v m2/s P W, E, H P N ; 1N = 1kg-m/s2 N/m2 J ; 1J...
... permanently This property of the material is necessary for forgings, in stamping images on coins and in ornamental work Ductility It is the property of a material enabling it to be drawn into wire with ... kidney-shaped lumps, These present in the form of *free graphite It has a low tensile give the ore its nickname of kidney ore strength, high compressive strength and no ductility It can be easily machined ... Uses as per IS : 1871 (Part I)–1987 percentage (Reaffirmed 1993) It is used for plain drawn or enamelled parts, tubes for oil well casing, steam, water and air passage, cycle, motor cycle and...
... costs 12 The use of metal inserts in the casting should be kept minimum 13 The markings such as names or numbers, etc., should never be provided on vertical surfaces because they provide a hindrance...
... the stress is directly proportional to strain, i.e σ ∝ε ∴ * E = or σ = E.ε σ P×l = ε A × δl It is named after Robert Hooke, who first established it by experiments in 1678 90 n A Textbook of Machine...
... In engineering practice, the machine parts of structural members may be subjected to static or dynamic loads which cause bending stress in the sections besides other types of stresses such as tensile,...
... failure, for infinite number of cycles, when subjected to (a) static load (b) dynamic load (c) static as well as dynamic load (d) completely reversed load Failure of a material is called fatigue ... `stress concentration'? How you take it into consideration in case of a component subjected to dynamic loading? Illustrate how the stress concentration in a component can be reduced Explain how...
... shear stress is not to exceed 56 MPa, find the length of weld for (a) Static loading, and (b) Dynamic loading [Ans 91 mm; 259 mm] A 125 × 95 × 10 mm angle is joined to a frame by two parallel...