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Machinery with Belts/Chains/Cables

In Machinery, Machinery with Belts/Chains/Cables, Research

A Cable-Passive Damper System for Sway and Skew Motion Control of a Crane Spreader

A Cable-Passive Damper System for Sway and Skew Motion Control of a Crane Spreader

La Duc Viet, Youngjin Park, Shock and Vibration, 2015, Volume 2015, Article ID 507549, 11 pages.

Abstract

While the crane control problem is often approached by applying a certain active control command to some parts of the crane, this paper proposes a cable-passive damper system to reduce the vibration of a four-cable suspended crane spreader. The residual sway and skew motions of a crane spreader always produce the angle deflections between the crane cables and the crane spreader. The idea in this paper is to convert those deflections into energy dissipated by the viscous dampers, which connect the cables and the spreader. The proposed damper system is effective in reducing spreader sway and skew motions. Moreover, the optimal damping coefficient can be found analytically by minimizing the time integral of system energy. The numerical simulations show that the proposed passive system can assist the input shaping control of the trolley motion in reducing both sway and skew responses.

How Multibody Dynamics Simulation Technology is Used

RecurDyn simulations of a crane spreader show significant vibration, sway, and skew. A passive damper is added to the system and the RecurDyn model shows that the damper is effective in reducing these unwanted motions.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Dynamic Analysis and Simulation of a Roller Chain Drive System on RecurDyn

Dynamic Analysis and Simulation of a Roller Chain Drive System on RecurDyn

Juntian Zhao, Shunzeng Wang, Shengyang Hu, Yu Liu, Journal of Applied Science and Engineering Innovation, June 2014, Volume 1, Number 1, pp 71-76.

Abstract

This paper is on the dynamic analysis and simulation of the roller chain drive systems, which are widely used in various high-speed, heavy-load and power transmission application. Presently, most studies were only focused on the analysis of the chain tight span, not the whole system. In this paper, a mathematical model is developed to calculate the dynamic response of the whole roller chain drive working with RecurDyn software. It presents the generalized recursion theory of the chain links in the model, with the initial condition and various tension. In this simulation model, the dynamics of any roller chain drive with two sprockets and two spans can be analyzed by the procedure. Finally, it provides velocity curves, displacement diagrams, accelerating curves and dynamic tension curves. This study provides an effective way for the dynamic analysis of all the chain drive system.

How Multibody Dynamics Simulation Technology is Used

The chain module in RecurDyn provides an easy way to model a roller train drive system. Built in tools make the dynamic analysis of a chain subsystem much easier to accomplish. Velocity, acceleration, and dynamic tension curves can provide effective means to design a chain drive system.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Cable installation simulation by using a multibody dynamic model

Cable installation simulation by using a multibody dynamic model

Cai Jin Yang, Di Feng Hong, Ge Xue Ren, Zhi Hua Zhao, Multibody System Dynamics, December 2013, Volume 30, Issue 4, pp 433-447.

Abstract

A major concern when installing the cables into the underground conduit is minimizing the tensile forces exerted on the cables as they are pulled. This knowledge makes it possible to avoid over conservative design practices and to achieve substantial saving during construction. A general computing algorithm of predicting the tensile force of the cable pulled through the underground conduit with an arbitrary configuration is presented in this paper, which is based on multibody system dynamic formulation. The presented multibody dynamic model for this problem consists of the cable, the underground conduit, and the interaction between the cable and the conduit. In this paper, the cable is modeled by the finite cable element based on an absolute nodal coordinate formulation. The interaction between the cable and the underground conduit is described by the Hertz contact theory. Numerical examples are presented to illustrate the effectiveness and efficiency of the proposed method for estimating the cable tension.

How Multibody Dynamics Simulation Technology is Used

RecurDyn is used to validate a computing algorithm for pulling a cable through an underground conduit. The cable is modeled as a flexible body and the stress profile and deformation are tracked over time. This model validates the simplified model and gives stress information in a dynamic environment that otherwise would be difficult to attain using physical testing.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Modelling of Gear Meshing: A Numerical Approach for Dynamic Behavior Estimation of Thin Gears

Modelling of Gear Meshing: A Numerical Approach for Dynamic Behavior Estimation of Thin Gears

Francesca Cura, Carlo Rosso, Topics in Nonlinear Dynamics, April 2013, Volume 35, Conference Proceedings of the Society for Experimental Mechanics Series, pp. 319-333.

Abstract

The paper deals with the numerical analysis of thin gears. In particular, a brief overview of literature modeling techniques is reported in order to understand the best way for analyzing the dynamic behavior of gears. Then a multibody commercial software is used for implementing different complexity levels of models. The study starts with a simplified model that considers rigid the gears and concentrates the stiffness in the contact between teeth. The second, and more complex, model considers the stiffness in the contact and adds the compliance of the teeth. Stiffness of tooth is depicted as a rotational stiffness placed at the tooth root. Then, the third model increases the complexity, in fact the second model is complicated introducing the compliance of the gear body. In order to do that, a modal analysis of the gears is conducted and the synthetized modal shapes of the gears are introduced in the multibody model. The comparison highlights how the dynamic behavior of thin gears is really important in the meshing force estimation, in fact the transmission error becomes more irregular and the contact forces increase. As a second aspect, this analysis emphasizes the influence of the contact damping and the contact friction in the backlash phenomenon.

How Multibody Dynamics Simulation Technology is Used

The transmission dynamics of very thin gears is studied using a fully rigid model, RFlex and FFlex. It is concluded that the compliance of the gear bodies could deeply affect the transmission behavior. These dynamics could easily be missed if the gears were assumed to be rigid bodies.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Analysis and Research of Automotive Trapezoid Synchronous Belt’s Fatigue Life

Analysis and Research of Automotive Trapezoid Synchronous Belt’s Fatigue Life

Li Zhanguo, Jiang Ming, Li Jiaxing, International Conference on Computer, Mechatronics, Control and Electronic Engineering (CMCE), Chungchun, August 2010, Volume 2, pp 193-195.

Abstract

The dynamic simulation model of synchronous belt meshing transmission is established in dynamics software “RecurDyn” applying the theory of MFBD (Multi-Flexible Body Dynamics), which analyzed the contact force on the working surfaces and stress distribution during the meshing transmission. The Finite Element Analysis Method was used to make the synchronous belt model meshed in Femap and investigated the belt’s teeth stress distribution after the model was imported into RecurDyn. A new design of synchronous belt’s and pulley’s tooth profiles for improving the transmission capacity of the automotive synchronous belt was proposed, in order to discover better materials to increase the fatigue life of the belt by optimization of the geometry of tooth profiles.

How Multibody Dynamics Simulation Technology is Used

RecurDyn was used to simulate a timing belt as a flexible body. The stress distribution of the belt is obtained during typical operating conditions. New designs and materials for the belt could be easily tested in RecurDyn to find the optimal design more quickly.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Simulation methods for conveyor belt based on virtual prototyping

Simulation methods for conveyor belt based on virtual prototyping

Kun Hu, Yong-cun Guo, Peng-yu Wang, International Conference on Mechanic Automation and Control Engineering (MACE), Wuhan, June 2010, pp 2332-2334.

Abstract

Belt simulation is the key point of virtual prototyping (VP) technology for belt conveyor. ADAMS can carry on the simple conveyor belt simulation. For its low precision and heavy work, ADAMS is not suitable for belt conveyer VP modeling and simulation. A new simulation method based on RecurDyn is introduced in this paper. The conveyor belt is divided into finite discrete micro belt segments. With the connecting force, the adjacent belt segments are connected to simulate the continuous belt. The results show the correctness of this method and the feasibility of belt conveyor VP, and there are also some limitations in this method. Further, the simulation method of conveyor belt has important guiding significance for simulation of flexible cable, such as the steel rope.

How Multibody Dynamics Simulation Technology is Used

The RecurDyn Belt toolkit provides convenient entities for quickly modeling belt systems. This includes automatic and intelligent modeling, discretization, and assembly of a belt combined with fast calculating speed and convenient sensors. The author finds the belt capabilities in RecurDyn to be superior to that of ADAMS. The virtual prototype of this heavy-duty belt conveyor developed in RecurDyn could be used for future design problems instead of an expensive physical prototype.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Mock-up of a support structure of the ITER vacuum vessel

Mock-up of a support structure of the ITER vacuum vessel

H.J. Ahn, J.W. Sa, Y.K. Kim, Y.S. Hong, J.H. Choi, T.H. Kwon, J.S. Lee, K.H. Park, T.S. Kim, W.I. Ha, I.S. Choi, B.C. Kim, K.H. Hong, C.H. Choi, Fusion Engineering and Design, June 2009, Volume 84, Issues 2-6, pp 375-379.

Abstract

The ITER vacuum vessel support systems located in the lower level sustain loads in radial and vertical direction. The support system consists of various sub-components like a linkage system, a pot type bearing, a vertical rope, a toroidal constraint, and dampers. In order to examine performance of the mechanism of the system, a mock-up of the linkage system which is comparatively complicated has been manufactured. Various fabrication methods were studied through the mock-up fabrication, and also several tests have been done using the mock-up. Those include assembly study, stroke test, static load test and fatigue test. In the full stroke test, the functional mechanism of the support structure has been demonstrated. In the structural test, the strength of the all components is evaluated by measuring reaction and strain of each component. In order to investigate the effect of tolerances and the damage due to the tests, the performance tests were conducted before and after the static and fatigue tests. The backlash for each stage is found from measured displacement hysteresis. As results of those tests, the performance of the ITER vacuum vessel support structure as well as its structural integrity has been evaluated in this study.

How Multibody Dynamics Simulation Technology is Used

RecurDyn was used to test the design of a vacuum vessel support system. The reaction forces at rotational joints, displacements, and rotation angles were obtained from the model. This information could be used to make intelligent design decisions regarding the geometry and materials used in the system.

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