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Arches, Cables and Pulleys
Published in M. Rashad Islam, Md Abdullah Al Faruque, Bahar Zoghi, Sylvester A. Kalevela, Engineering Statics, 2020
M. Rashad Islam, Md Abdullah Al Faruque, Bahar Zoghi, Sylvester A. Kalevela
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a cable, rope or belt along its circumference, as shown in Figure 5.27. Pulleys are used in a variety of ways to lift loads, apply forces and to transmit power. Pulley systems may consist of friction between the surfaces or friction may be neglected for well-finished and lubricated ones. In this section, only a frictionless pulley is discussed. Pulleys with friction will be discussed in Chapter 11.
Electrical science and principles
Published in Trevor Linsley, Electrical Installation Work Level 2, 2019
A pulley is a mechanical advantage device that uses wheels, has a groove contained within its outer edge and turns freely on an axle attached to a stationary or moveable position. The pulley has a rope which is wrapped around a wheel-and-axle system which permits a user to lift heavy loads by matching or reducing the effort required regarding the weight or load in question. The greater the number of pulleys involved, the greater the number of rope parts, which basically means that the user requires less effort.
Simple Machines
Published in G. Boothroyd, C. Poli, Applied Engineering Mechanics, 2018
A pulley consists of a wheel which is free to turn on its axle and carries a rope, cable, or belt. For a system consisting of a single pulley, one end of the rope is attached to the load while a pull of Fp is applied to the other end. Figure 6.2a shows a single pulley which is being used to change the direction of the applied force in order to raise a load of mass m. The free-body diagrams for the pulley and the mass are shown in Fig. 6.2b. Considering static equilibrium of the mass gives () ∑Fy=0:Fr3−Fw=0
Mechanical and experimental analysis of steel wire rope during torsion
Published in Mechanics of Advanced Materials and Structures, 2023
Shuai Wang, Xiaopeng Xi, Xixue Xing, Haipeng Chi
If the wire rope went through two straight changes from entering the pulley to leaving the pulley, the amount of the wire rope’s fatigue bending was counted as 2. if the wire rope reciprocates once, the bending fatigue times of sections A, B, and C are 4, 2, as well as 0. The test is divided into four groups, and the wire rope broken wire analysis is conducted through various tensions, various pulley diameters and various sections. The specific test groups are as follows: Test 1: Wire rope tension is 10 KN, pulley ① selects big pulley, pulley ③ selects small pulley;Test 2: The tension of wire rope is 10 KN. The pulleys ① ② ③ are small pulleys;Test 3: The rope tension is 8 KN, pulley ① selects big pulley, pulley ③ selects small pulley;Test 4: The tension of wire rope is 8 KN, and the pulleys ① ② ③ are all small pulleys.
Study on force characteristics of catamaran buttress during floating
Published in Ships and Offshore Structures, 2021
Changyi Yu, Wei Pan, Yiyong Li, Xiaoqiang Kou, Changxi Yue
Eight buttresses and cable mechanisms are arranged under the hull beam of the catamaran; each buttress’ base, shear blocks and cable lift points are arranged on the top of pipe joints. Six base embedded parts are arranged on the tops of E1 pipe joints, and eight base embedded parts are arranged on the tops of standard pipe joints. The pipe is connected to the ship via cable, which is installed and connected 1 day before the catamaran’s undocking. Four cables are required for each hull buttress, 24 cables for E1 pipe joints and 32 cables for standard pipe joints. The lifting winch (No. l) of the catamaran is connected to the lift point on the pipe joint. There are six sets of catamaran-lifting systems, each of which is equipped with a lifting winch, guide pulley and lifting pulley block. The winch’s wire rope is connected to the immersed tube through the pulley block.
Full-Scale Tests on the Horizontal Hysteretic Behavior of a Single-Span Timber Frame
Published in International Journal of Architectural Heritage, 2020
Xiwang Shi, Tieying Li, Yohchia Frank Chen, Jinyong Chen, Qingshan Yang
The loading system includes the chain blocks, fixed-pulley blocks, reaction frame, and wire rope (Φ25), as shown in Figure 5c. The chain blocks were connected to the steel columns and reaction frames through the wire rope. In order to receive the force at the center of the cross-section of the test model, the wire rope connecting the steel column and chain blocks was fixed using two fixed pulley blocks. The steel girder was set at the top of the fixed pulley and connected to the ground groove through the screws so as to avoid the loosening of the fixed pulley. The chain blocks showed a low loading rate, meaning that the loading was approximately uniform. Apart from their effect on loading, the chain blocks by unidirectional braking function also provided a protection in case the test model would collapse in the loading direction.