Dynamic Analysis of Forces Generated on Inner Parts of a Double Offset Constant Velocity Universal Joint (DOJ): Non-Friction Analysis

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455413500107 ◽

2013 ◽

Vol 13 (01) ◽

pp. 1350010 ◽

Cited By ~ 1

Author(s):

IOANNIS G. RAFTOYIANNIS ◽

GEORGE T. MICHALTSOS

Keyword(s):

Dynamic Response ◽

Dynamic Analysis ◽

Dynamic Behavior ◽

Analytical Model ◽

Constant Velocity ◽

Steel Beam ◽

Continuum Approach ◽

Theoretical Formulation ◽

Modal Superposition ◽

Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

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The Scope for a Compliant Homokinetic Coupling Based on Review of Compliant Joints and Rigid-Body Constant Velocity Universal Joints

Volume 4: 36th Mechanisms and Robotics Conference, Parts A and B ◽

10.1115/detc2012-71514 ◽

2012 ◽

Cited By ~ 5

Author(s):

Davood Farhadi Machekposhti ◽

N. Tolou ◽

J. L. Herder

Keyword(s):

Rigid Body ◽

Constant Velocity ◽

Compliant Mechanism ◽

Analytical Data ◽

Graph Representation ◽

Universal Joint ◽

Compliant Joints ◽

Cylindrical Joint ◽

Body Joints ◽

Universal Joints

Many applications require a compliant mechanism to transmit rotation from one direct to another direct with constant velocity. This paper presents a literature survey towards the design of compliant constant velocity universal joints. The traditional constant velocity universal joints available from the literature were studied, classified and their mechanical efficiencies were compared. Also the graph representation of them was studied. In the same manner, literature review for different kind of compliant joints suitable for the Rigid-Body-Replacement of constant velocity universal joints was also performed. For the first time a comparison with analytical data of compliant joints was performed. All of compliant universal joints are non-constant velocity and designed based on rigid Hooke’s universal joint. Also we show there are no equivalent compliant joints for some rigid-body joints such as cylindrical joint, planar joint, spherical fork joint and spherical parallelogram quadrilateral joint. However, we may achieve them by combining numbers of available compliant joints. The universal joints found are non-compliant non-constant velocity universal joint, non-compliant constant velocity universal joint or compliant non-constant velocity universal joint. A compliant constant velocity universal joint has a great horizon for developments, for instance in medical or rehabilitation devices.

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Study on Comprehensive Performance Testing Table and Intelligent Measuring Technology of Constant Velocity Universal Joint Assembly

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.1539 ◽

2012 ◽

Vol 591-593 ◽

pp. 1539-1542

Author(s):

Lun Shi ◽

Xu Qi Qin ◽

Xiao Jun Liu

Keyword(s):

Constant Velocity ◽

Performance Testing ◽

Fuzzy Reasoning ◽

Measuring Method ◽

Measurement Precision ◽

Universal Joint ◽

Fuzzy Method ◽

Comprehensive Performance ◽

And Control ◽

Joint Assembly

A comprehensive performance testing table, on which 9 testing items can be done, of the constant velocity joint drive shaft assembly is developed. The principle of the system is introduced and the mechanical structure and the computer measuring and control system of it are discussed particularly. Some intelligent measuring methods, such as fuzzy method, are used in the system and an example of testing the slip curve characteristic of the joint assembly by fuzzy measuring method is presented in detail, including its membership function and fuzzy rules of fuzzy reasoning. The slip curve measured by traditional method compared with that by fuzzy method. The experimental results show that the measurement precision by fuzzy method is more accurate than that by the traditional one.

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A Fully Compliant Constant Velocity Universal Joint

Volume 5A: 39th Mechanisms and Robotics Conference ◽

10.1115/detc2015-46813 ◽

2015 ◽

Cited By ~ 1

Author(s):

D. Farhadi Machekposhti ◽

N. Tolou ◽

J. L. Herder

Keyword(s):

Rigid Body ◽

Rotational Motion ◽

Constant Velocity ◽

Large Deflection ◽

Experimental Results ◽

Universal Joint ◽

Compliant Structure ◽

Body Model ◽

Rigid Body Model ◽

Kinematic Properties

This paper presents the concept and fabrication of a large deflection compliant Constant Velocity universal joint (CV joint). A novel compliant structure is proposed based on the 6R Hybrid spatial overconstrained linkage. Due to symmetry, its kinematic properties are such that can transfer rotational motion between two angled shafts with true constant velocity. The kinematic of the mechanism and the Pseudo-Rigid-Body model of its compliant configuration are studied and analyzed. A prototype was manufactured and experimentally evaluated. It was verified that the experimental results are consistent with the theoretical expectations.

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