Methods for Improving the Knuckle Boom Capacity in Truck-Mounted Cranes

1976 ◽  
Vol 98 (4) ◽  
pp. 1183-1187
Author(s):  
B. N. Sridhar
Keyword(s):  
Test Data ◽  
Close Agreement ◽  
Moment Arm ◽  
Linkage Design ◽  
Position Synthesis ◽  
Four Bar Linkage ◽  
Constant Moment

Presented herein are two different concepts for improving the knuckle boom capacity of truck-mounted cranes. The first concept deals with an improved Planar four-bar linkage using the two-position synthesis, as well as with recommendations for optimizing the linkage. The linkage design employing the two-position synthesis was built as hardware with fairly close agreement between calculated and test data. The second concept is concerned with a constant moment-arm mechanism using a rack and pinion arrangement.

Synthesis of Compliant Mechanisms With Specified Equilibrium Positions

2005 ◽  
Author(s):  
Hai-Jun Su ◽  
J. Michael McCarthy
Keyword(s):  
Compliant Mechanisms ◽  
Equilibrium Constraints ◽  
Equilibrium Equations ◽  
Equilibrium Configurations ◽  
Form Design ◽  
Design Requirements ◽  
Synthesis Procedure ◽  
Position Synthesis ◽  
Four Bar Linkage ◽  
Sine And Cosine Functions

This paper presents a synthesis procedure for a compliant four-bar linkage with three specified equilibrium configurations. The finite position synthesis equations are combined with equilibrium constraints at the flexure pivots to form design equations. These equations are simplified by modeling the joint angle variables in the equilibrium equations using sine and cosine functions. Solutions to these design equations were computed using a polynomial homotopy solver. In order to provide a design specification, we first compute the six equilibrium configurations of a known compliant four-bar mechanism. We use these results as design requirements to synthesize a compliant four-bar. The solver obtained eight real solutions which we refined using a Newton-Raphson technique. A numerical example is provided to verify the design methodology.

Kinematic Mapping Based Evaluation of Assembly Modes for Planar Four-Bar Synthesis

2005 ◽  
Author(s):  
Hans-Peter Schro¨cker ◽  
Manfred L. Husty ◽  
J. Michael McCarthy
Keyword(s):  
Image Space ◽  
Synthesis Problem ◽  
New Method ◽  
Kinematic Mapping ◽  
Position Synthesis ◽  
Four Bar Linkage

This paper presents a new method to determine if two task positions used to design a four-bar linkage lie on separate circuits of a coupler curve, known as a “branch defect.” The approach uses the image space of a kinematic mapping to provide a geometric environment for both the synthesis and analysis of four-bar linkages. In contrast to current methods of solution rectification, this approach guides the modification of the specified task positions, which means it can be used for the complete five position synthesis problem.

Analysis Design and Roof Motion Track Simulation for Gob-Side Entry Retaining Hydraulic Support

2014 ◽  
Vol 633-634 ◽  
pp. 1244-1247 ◽  
Author(s):  
Xin Ya Wang ◽  
De Yong Shang ◽  
Na Liu ◽  
Song Yang Li ◽  
Xun Fan
Keyword(s):  
Numerical Methods ◽  
3D Modeling ◽  
Dual Function ◽  
Motion Trajectory ◽  
Hydraulic Support ◽  
Movement Model ◽  
Linkage Design ◽  
Analysis Design ◽  
Four Bar Linkage ◽  
Track Simulation

The reliability of formwork support is directly related to gob-side entry retaining success. In this paper a dual function of supporting and filling formwork support is designed. Use SolidWorks software build 3D modeling and virtual assembly, The establishment of a movement model of the anti-four-bar linkage formwork template using numerical methods and get the motion trajectory of the roof. It has been verify that the anti-four bar linkage design of the hydraulic support is feasible.

Radial-Interradial Spring Tire Models

1988 ◽  
Vol 110 (1) ◽  
pp. 70-75 ◽  
Author(s):  
J. M. Badalamenti ◽  
G. R. Doyle
Keyword(s):  
Test Data ◽  
Close Agreement ◽  
Tire Model ◽  
Drag Forces ◽  
Tire Models

Two radial-interradial spring tire models are developed to predict vertical and drag forces produced by a tire as it rolls over an obstacle. Interradial springs are used to interconnect radial linear or quadratic springs to make each tire element’s deflection dependent upon its adjacent element’s deflections. Forces predicted by these two models are compared with a previously developed quadratic radial spring tire model and test data. The newly developed quadratic radial-linear interradial spring tire model predicts vertical and drag forces that are in close agreement with the test data.

Optimal Linkage Design for Bicycle Power Transmission Using Symmetric Four-Bar

2006 ◽  
Author(s):  
Carl A. Nelson
Keyword(s):  
Internal Combustion Engines ◽  
Power Transmission ◽  
State Of The Art ◽  
Mechanical Efficiency ◽  
Substantial Improvement ◽  
Combustion Engines ◽  
Force Transmission ◽  
Linkage Design ◽  
Potential Applications ◽  
Four Bar Linkage

Use of a symmetric crank-rocker four-bar linkage is presented as an alternative to the standard bicycle crank. With the coupler being the driven link, a kinematic and force-transmission analysis is presented. Results of constrained nonlinear optimization for geometric synthesis show a substantial improvement in mechanical efficiency compared to the state of the art. Dead-center positions are also eliminated. Potential applications to other linear-to-rotary power transmission devices, such as internal-combustion engines, are also discussed.

Four-Bar Linkage Synthesis Methods for Two Precision Positions Combined With N Quasi-Positions

1995 ◽  
Author(s):  
John A. Mirth
Keyword(s):  
Synthesis Method ◽  
Synthesis Methods ◽  
Bounded Motion ◽  
Transmission Angle ◽  
Pass Through ◽  
Position Synthesis ◽  
Four Bar Linkage ◽  
Exact Positions ◽  
Linkage Synthesis

Abstract Mechanisms seldom need to pass through more than one or two exact positions. The method of quasi-position synthesis combines a number of approximate or “quasi” positions with two exact positions to design four-bar linkages that will produce a specified, bounded motion. Quasi-position synthesis allows for the optimization of some linkage characteristic (such as link lengths or transmission angles) by using the three variables that describe a single quasi-position. Procedures for circuit and transmission angle rectification are also easily incorporated into the quasi-position synthesis method.

The Volumetric Performance of Cavitating Centrifugal Pumps: Part 2: Predicted and Measured Performance

1986 ◽  
Vol 200 (3) ◽  
pp. 168-172 ◽  
Author(s):  
E Grist
Keyword(s):  
Centrifugal Pump ◽  
Test Data ◽  
Close Agreement ◽  
Engineering Application ◽  
Centrifugal Pumps ◽  
Zone Length ◽  
Temperature Range ◽  
Spherical Cavities ◽  
Performance Comparisons

The predicted performance of a cavitating centrifugal pump, calculated using a method which applies the concept of notional spherical cavities, has been compared with measured performance values. From the close agreement evident in predicting the nett positive suction head at breakdown and the generated head–cavitation zone length curves the method and concept appear suitable for wider engineering application. The volumetric performance comparisons made use test data on water in the temperature range 2–1433°C.

Geometric Conditions for the Satisfaction of Order in Four Position Synthesis of Four-Bar Linkages

1992 ◽  
Author(s):  
John A. Mirth
Keyword(s):  
Type A ◽  
Computer Programs ◽  
Order Condition ◽  
Order Problem ◽  
Geometric Characteristics ◽  
Geometric Conditions ◽  
Linkage Design ◽  
Correct Sequence ◽  
Pass Through ◽  
Position Synthesis

Abstract A mechanism that cannot pass through all precision positions in the correct sequence is said to violate the order condition. This paper establishes the order requirements for the precision position synthesis of all Grashof and non-Grashof four-bar linkages. These order requirements are based on three geometric characteristics of the four-bar mechanism: the angle of one of the rotating links that is attached to the ground link; the limits that the entire mechanism imposes on this rotating link; and the dyad configurations for the dyad that is opposite the ground pivot of this link. The results improve upon traditional discussions of the order problem by including all four-bar linkages, rather than just those of a specified Grashof type. A table summarizes the results in a form that allows for their implementation into computer programs for linkage design and analysis.

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