Chapter 6, Problem 6P

practice problems want detailed break down

6.105. Determine force P on the cable if the spring is compressed 0.025 m when the mechanism is in the position shown. The spring has a stiffness of k = 6 kN/m. E P 150 mm D T 30° 200 mm 200 mm 200 mm B 800 mm

6.71. Determine the reactions at the supports A, C, and E of the compound beam. 3 kN/m 12 kN A B CD E -3 m 4 m 6 m 3 m 2 m

A countershaft carrying two V-belt pullets is shown in the figure. Pulley A receives power from a motor through a belt with the belt tensions shown. The power is transmitted through the shaft and delivered to the belt on pulley B. Assume the belt tension on the loose side (T1) at B is 30% of the tension on the tight side (T2). (a) Determine the tension (i.e., T₂ and T₁) in the belt on pulley B, assuming the shaft is running at a constant speed. (b) Find the magnitudes of the bearing reaction forces, assuming the bearings act as simple supports. (c) Draw shear-force and bending moment diagrams for the shaft (in XZ and XY plane if needed). (d) Calculate the maximum moments at points A and B respectively and find the point of maximum bending moment (A or B). (e) Find maximum stresses (tensile, compressive, and shear stresses) at the identified point of maximum moment (hint: principal and max shear stresses) 8 dia. 9 400lbf 50lbf 45° 1.5 dia. T₂ B Units in inches T₁ 10 dia.

The cantilevered bar in the figure is made from a ductile material and is statically loaded with F,, = 200 lbf and Fx = F₂ = 0. Analyze the stress situation in rod AB by obtaining the following information. Note that the stress concentration factors are neglected in the following questions (Kt and Kts=1). (a) Determine the precise location of the critical stress element. (b) Sketch the critical stress element and determine magnitudes and direction for all stresses acting on it. (Transverse shear may only be neglected if you can justify this decision.) (c) For the critical stress element, determine the principal stresses and maximum shear stress. 6 in 1-in dia. B +1- in in 2 in 5 in

A laminated thick-walled hydraulic cylinder was fabricated by shrink-fitting jacket having an outside diameter of 300mm onto a SS 304 steel tube having an inside diameter of 100mm and an outside diameter of 200mm as shown in the figure. The interference (8) was 0.15mm. When the Young's modulus for both SS304 and 1020 steel is the same as 200GPa, and the Poisson's ratio is also the same as 0.3 for both materials, find the followings. Initially 100 mm Initially 200 mm Initially 300 mm SS 304 1020 steel (a) P; (interfacial contact stress) (b) The maximum stresses (σ, and σ+) in the laminated steel cylinder resulting from the shrink fit.

Auto Controls   Design a proportional derivitivecontroller for a plant orsystemthat satisfies the following specifications : 1. is steady-state error is less than 2 % for a ramp input.   2.) Damping ratio (zeta) is greater than 0.7have determined the   3. Once youvalue of kp and kd, then plotthe response of the compensated(with controller) and uncompensated( without the controller, only the plantsystem using MATLAB.

Auto Controls   (a) Refer to the above figure .What kind of controller is it ? (b) simplify the block diagramto derive the closed loop transfer function of the system. (C) What are the assumptions thatare needed to make to findthe controller gain ? What arethe value of Kp , Ti and Td ?

Auto Controls   Design a PID controller for thefollowing system so that the modified system satisfies the followingspecifications : 1. settling time ,ts = 1.96 s and % Overshoot Mp = 70.7 %   Assume a non-dominant pole at  s = -15 to solve the problem     The plot the compensated andThen plot the uncompensated system in MATLAB.   what can you see from the plot ? what is your observation ?