2. A V belt is designed to work under the conditions: transfer power P=10KW, input rotating speed n=1450r/min. Given tensile load on tight side is Fi=1300N, and diameter of small belt wheel is di=170mm. Please calculate the pretension load Fo.
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- A 3 x 8 member in a diaphragm resists a tension force caused by the lateral wind pressure. Lumber is Select Structural DF-L. A single line of 7/8 in. diameter bolts is used to make the connection of the member to the diaphragm. Cu = 1.0, C = 1.0, and C = 1.0. Find: a. The maximum axial tension load using ASD. b. The factored axial tension capacity using LRFD. Hint: This is a horizontal member with sheathing on top. Think carefully about orientation when computing the net area.Find unknown forces pls . Step by stepA helical compression spring has a scale of 500 lb/in., an outside diameter of 2.75 in, a free length of 8 inches and with squared and ground ends. The load is 1,000 lbs and the working stress on the wire material is 65000 psi. If the Wahl factor of 1.25 is to be used, calculate the following: A. The standard wire diameter B. The number of active coil if G = 10 800 000 psi C. The solid height D. The stress at solid height
- A helical compression spring is wound using 0.12-in-diameter phosphor-bronze B159 wire. The spring index C = 10 and the total number of coils is N = 14. You may assume that the spring has both ends squared and ground and is supported between fixed ends. Also, Sgy = 0.45 · Sut- a. Estimate the spring rate. b. Estimate the static load corresponding to the yield strength. c. What should the free length of the spring be to ensure that when it is compressed solid the torsional stress does not exceed the yield strength? d. Calculate the critical value of the free length of the spring to avoid buckling.3. A motor is connected by a belt to pulley B. T, is the tight-side tensile force equal to 1800 N. The shaft spins at a constant speed, 650 rpm. The power delivered by the motor is 12.6 kW. On pulley A, connected to the load, the slack side of the belt has a tension equal to th of the tight side. b T T, B d shaft Dimensions are as follows: da 200 тm 300 тт | 250 тm |180 тm | 250 тm 26 тm dB dahaft a We analyzed a problem similar to this on Test 01 using static failure theories. Is this strictly correct? Because the shaft is spinning, would not a material particle see a time-varying reversal of the the bending stress as in the R.R. rotating beam test? Would a particle see a reversal of the torsional shear stress? Assume Sut = 370 MPa and Sy = 300 MPa. Ignore Marin factors. Ignore stress concentrations. Ignore direct shear stress (that due to V). Find the safety factors with respect to fatigue and yielding. Be guided by section 6-14 on combined loading.EQUATION SHEET TABLE A-9 LINKS BELOW bartleby doesn't allow more than 2 pic uploads so i attached them
- A plate clutch has 3 discs on the driving shaft and 2 discs on the driven shaft, providing four pairs of contact surfaces. The outside diameter of the contact surfaces is 240 mm and inside diameter 120 mm. Assuming uniform pressure and coeff. Of friction is 0.3. Find the total spring load pressing the plates together to transmit 23kw power at 1475 revolution per minute. If there 6 springs each of stiffness 13 kN/m and each of the contact surfaces has worn away by 1.25 mm. find the maximum power that can be transmitted assuming uniform wear. A plate clutch has 3 discs on the driving shaft and 2 discs on the driven shaft, providing four pairs of contact surfaces. The outside diameter of the contact surfaces is 240 mm and inside diameter 120 mm. Assuming uniform pressure and coeff. Of friction is 0.3. Find the total spring load pressing the plates together to transmit 23kw power at 1475 revolution per minute. If there 6 springs each of stiffness 13 kN/m and each of the contact surfaces…Design and draw a neat sketch of a cast iron protective type flange coupling to transmit “P” kW at “N” rpm. from a turbine generating n electric motor to a compressor. The service factor may be assumed as 1.35. The following permissible stress may be used: Shear stress for shaft, bolt and key material = 40 MPaCrushing stress for bolt and key = 80 MPaShear stress for cast iron = 8 Mpa Speed N in Rpm = 200Power P in kN = 16(2) A 30° MK = 0.45 Мк G B MA= 1 = 2 ку .8 kg - In the above arrangement of two blocks and card, the blocks start Use PWE to at rest, and the pulleys are frictionless. Find VA (mag and direc) after may assume that the card tension You B has descended by 0.65 m. is constant. You will need to use NSL to relate N₁ to WA E=mAg), NA and you Should show all the steps of this preliminary step also.
- Project 1: A Pully drive system used in washing machine is designed based on flat belt as in Figure.1/a. The tension in the pully is 115 N when it is stationary. The flat and V-belt type as well as the geometry specifications (Diameters and lap angle) are shown in Figure.2. The speed of rotation N is 1400 rpm and the coefficients of friction is u = 0.25 Flat Belt V-Belt (b) Figure.1: Flat vs V-belt pully drive section (а) lap angle = 480 mm D = 160 D,=240 mm Figure.2: Pully drive system specifications HT Page 5 of 10 الحسين التقنية Al Hussein Technical 1. Find the initial tension in each side 2. Find the power transmitted on the smaller wheel 3. Discuss the initial tension requirements/calculations to convert the system to the operation of a V-belt drive, if the included angle of V-section B = 15° (assume same u ), in your discussion compare the critical tension ration for both type and the transmitted power values.Flat belt 100mm wide and 8mm thick transmits power between two pulleys, running at 1600 m/min. The mass of belt is 0.9kg/m length, the angle of lap in the smaller pulley is 1650 and the coefficient of friction between the belt and pulleys is 0.3, If the maximum permissible stress in the belt is 2MN/m2, find the maximum power transmitted. 1 Add fileAn electric motor running at 970rpm is used to drive a rock crushing machine with a design power of 32 kW. A 33oz ducking weight flat belt drive is proposed with a tension ratio of R = 4 and belt width b = 120 mm. The pitch diameter of the driving pulley (on the motor-end) is 320mm. a) What is the mass per mm width per m length per ply in kg/mm/m/ply? Number (exact value) b) What is the maximum working tension per mm width per ply in N/mm/ply? Number (exact value) c) Calculate the belt velocity in m/s Number (+/-1%) d) Determine the number of belt plies required. Your answer should be an integer number (no decimals). Number (exact value)