ABSTRACT A non-linear contact analysis of a leading-trailing shoe drum brake‚ using the finite element method‚ is presented. The FE model accurately captures both the static and pseudo-dynamic behaviour at the friction interface. Flexible–to-flexible contact surfaces with elastic friction capabilities are used to determine the pressure distribution. Static contact conditions are established by initially pressing the shoes against the drum. This first load step is followed by a gradual increase of
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speed 5. A plane flying horizontally above Earth’s surface at 100. m/s drops a crate. The crate strikes the ground 30.0 s later. What is the magnitude of the horizontal component of the crate’s velocity just before it strikes the ground? [Neglect friction.] (1) 0 m/s (3) 294 m/s (2) 100. m/s (4) 394 m/s 6. A woman with horizontal velocity v1 jumps off a dock into a stationary boat. After landing in the boat‚ the woman and the boat move with velocity v2. Compared to velocity v1‚ velocity
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Introduction Chapter 3 Electromechanical Energy Conversion Topics to cover: 1. Introduction 3. Force and Torque 5. Friction 2. Electro-Motive Force (EMF) 4. Doubly-Excited Actuators 6. Mechanical Components Introduction (Cont.) For energy conversion between electrical and mechanical forms‚ electromechanical devices are developed. In general‚ electromechanical energy conversion devices can be divided into three categories: – Transducers (for measurement and control)‚ which transform
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Physics 111 N Final Exam Please answer all problems on the blank paper provided. Clearly print your name and student ID on every sheet you use. Please hand in your formula sheet along with your answers Course ID : 10076 Prof. Jozef Dudek Unless instructed otherwise‚ you must show working‚ or explain how you came to your answer for all questions. You cannot get full credit on a question unless working is shown. Partial credit will be awarded for working which is partially correct
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Home Drive_Index Gears Gearboxes Worm Gears Introduction..... Nomenclature..... Design Parameters..... Specifications..... Designation..... Worm Gear Profiles..... Materials..... Design Process..... Thermal Design..... Worm Gear Formulue..... Friction Factors..... Strength Design to BS721..... Strength Design to AGMA..... Introduction A worm gear is used when a large speed reduction ratio is required between crossed axis shafts which do not intersect. A basic helical gear can be used but the
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APPLYING NEWTON’S LAWS 5.1. 5 IDENTIFY: a = 0 for each object. Apply ΣFy = ma y to each weight and to the pulley. SET UP: Take + y upward. The pulley has negligible mass. Let Tr be the tension in the rope and let Tc be the tension in the chain. EXECUTE: (a) The free-body diagram for each weight is the same and is given in Figure 5.1a. ΣFy = ma y gives Tr = w = 25.0 N. (b) The free-body diagram for the pulley is given in Figure 5.1b. Tc = 2Tr = 50.0 N. EVALUATE: The tension is the
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POTENTIAL ENERGY AND ENERGY CONSERVATION 7 7.1. IDENTIFY: U grav = mgy so ΔU grav = mg ( y2 − y1 ) SET UP: + y is upward. EXECUTE: (a) ΔU = (75 kg)(9.80 m/s 2 )(2400 m − 1500 m) = +6.6 × 105 J (b) ΔU = (75 kg)(9.80 m/s2 )(1350 m − 2400 m) = −7.7 × 105 J EVALUATE: U grav increases when the altitude of the object increases. 7.2. IDENTIFY: The change in height of a jumper causes a change in their potential energy. SET UP: Use ΔU grav = mg ( yf − yi ). EXECUTE: ΔU grav = (72 kg)(9.80 m/s2
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Clutch Objective: The Aim of this experiment is to find the relation between the axial load W and the frictional torque T‚ using a single plate clutch. To find the coefficient of friction between the clutch surfaces using the uniform wear theory. To experimentally conclude whether the average radius of the friction plate is proportional to the frictional torque. Apparatus used: Weights‚ String Plate clutch Hangers Pulleys 5 x 2kg weights for axial load Theory: It is stated theoretically
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STAGE 2 PHYSICS Assessment Type 1: Investigation Folio Practical Investigation 2: Momentum Purpose: To investigate the relationship between the laws of conservation of momentum and Newton’s Third Law and another variable of your choice for a 2D collision of two objects. Materials: Hover puck Video Recorder Tripod Masking tape Ruler Tracker (Computer Program) Method: On a flat surface containing no obstacles‚ prepare the tripod and camera over the selected area that the
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force of 95.0 N is applied to a 60.0-kg crate on a rough‚ level surface. If the crate accelerates at 1.20 m/s2‚ what is the magnitude of the force of kinetic friction acting on the crate? (a) 23.0 N (b) 45.0 N (c) 16.0 N (d) 33.0 N (e) 8.80 N Newton’s second law gives the net force acting on the crate as This gives the kinetic friction force as ‚ so choice (a) is correct. 2. A 70.0-kg man stands on a pedestal of mass 27.0 kg‚ which rests on a level surface. What is the normal force exerted by
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