Harmonic Balancing of Planar Machinery by Arbitrarily Placed Counterweighing Shafts

2007 ◽  
Author(s):  
Carlo Innocenti
Keyword(s):  
Harmonic Component ◽  
Degree Of Freedom ◽  
New Method ◽  
Supporting Structure ◽  
Harmonic Components ◽  
Selection Of ◽  
Shaking Moment

The paper proposes a new method to neutralize the shaking force and shaking moment exerted on its supporting structure by a one-degree-of-freedom machine whose non-stationary parts move parallel to the same plane. Differently from the well-known technique that takes advantage of two counterweighing shafts for each of the harmonic components of the frame excitation that has to be counteracted, the proposed method requires three shafts per harmonic component. This seemingly additional complexity is offset by the complete freedom of selection of the shaft axis positions, a feature not enjoyed by the classical two-shaft device. An example shows application of the proposed method to a four-cylinder in-line engine.

scholarly journals Balancing conditions of planar mechanisms with multi-degree of freedom

2005 ◽  
Vol 27 (4) ◽  
pp. 204-212 ◽  
Author(s):  
Nguyen Van Khang ◽  
Nguyen Phong Dien ◽  
Pham Van Son
Keyword(s):  
Computer Algebra ◽  
Degree Of Freedom ◽  
New Method ◽  
Computer Algebra Systems ◽  
Planar Mechanisms ◽  
Balancing Conditions ◽  
Shaking Moment

This paper presents a new method for deriving the balancing conditions of planar mechanisms with multi-degree of freedom. The method has advantage of being suitable for the application of the widely accessible computer algebra systems such as MAPLE. In the example, the conditions for complete shaking force and shaking moment balancing of a planar five-bar linkage are given.

A New Method for Selecting the Best Design

2012 ◽  
Vol 20 (1) ◽  
pp. 11-17
Author(s):  
Mark E. Benden ◽  
Kristen Miller ◽  
Eric Wilke ◽  
Eduardo Ibarra
Keyword(s):  
Patient Outcomes ◽  
New Method ◽  
Driver Safety ◽  
Transport Vehicle ◽  
Medical Transport ◽  
Expert Ratings ◽  
Vehicle Seat ◽  
Improve Patient ◽  
Individual Expert ◽  
Selection Of

In this article the authors illustrate how individual expert ratings can be employed to prioritize specifications for use in forced rankings. Those rankings are then used to select a design with the best overall usability. The authors provide an example of this approach in the selection of a medical transport vehicle seat to produce a more ergonomic product that could improve patient outcomes and driver safety.

scholarly journals First person – Natalí Delorme and Leonardo Zamora

Biology Open ◽  
2021 ◽  
Vol 10 (12) ◽  
Keyword(s):  
Oxidative Stress ◽  
Life Cycle ◽  
New Zealand ◽  
Stress Response ◽  
Marine Invertebrates ◽  
Early Career ◽  
New Method ◽  
First Person ◽  
Early Career Researchers ◽  
Selection Of

ABSTRACT First Person is a series of interviews with the first authors of a selection of papers published in Biology Open, helping early-career researchers promote themselves alongside their papers. Natalí Delorme and Leonardo Zamora are co-first authors on ‘ A new method to localise and quantify oxidative stress in live juvenile mussels’, published in BiO. They are both researchers in the laboratory of Serean Adams at the Cawthron Institute, Nelson, New Zealand. Natalí's research interests centre around ecophysiology of marine invertebrates, particularly on the organisms' stress response. Leonardo is investigating the biology of commercially, ecologically and culturally relevant marine invertebrates throughout their life cycle.

A new closed-form kinematics of the generalized 3-DOF spherical parallel manipulator

Robotica ◽  
1999 ◽  
Vol 17 (5) ◽  
pp. 475-485 ◽  
Author(s):  
Zhen Huang ◽  
Y. Lawrence Yao
Keyword(s):  
Closed Form ◽  
Analytical Method ◽  
Parallel Manipulator ◽  
Degree Of Freedom ◽  
New Method ◽  
Numerical Example ◽  
Three Degree Of Freedom ◽  
Spherical Parallel Manipulator

This paper presents a new method to analyze the closed-form kinematics of a generalized three-degree-of-a-freedom spherical parallel manipulator. Using this analytical method, concise and uniform solutions are achieved. Two special forms of the three-degree-of-freedom spherical parallel manipulator, i.e. right-angle type and a decoupled type, are also studied and their unique and interesting properties are investigated, followed by a numerical example.

scholarly journals Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3887
Author(s):  
Jeong ◽  
Lee ◽  
Hur
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Harmonic Component ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Cogging Torque ◽  
Maxwell Stress Tensor ◽  
The Finite Element Analysis ◽  
Harmonic Components

This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

A new method for calculating the Jacobian for a robot manipulator

Robotica ◽  
1983 ◽  
Vol 1 (4) ◽  
pp. 205-209 ◽  
Author(s):  
Jadran Lenarčič
Keyword(s):  
Computational Efficiency ◽  
Execution Time ◽  
Robot Manipulator ◽  
Degree Of Freedom ◽  
New Method ◽  
Trigonometric Functions

SUMMARYA new method for calculating the Jacobian for a general n degree-of-freedom robot manipulator is presented and compared with some known other methods. The computational efficiency of the method is estimated in terms of the number of multiplications, additions/subtractions, trigonometric functions required, and the execution time on a VAX 11/750 computer. It is shown that the new method proposed in this paper is one of the most efficient when applied on a robot manipulator with successively parallel or rectangular joint rotations.

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