Resume

• 2004

  University of Dayton

  Member of an interdisciplinary team focused on supporting the transition of in house production of gearbox components to outside vendors for cost reduction\n - Validate fabrication processes\n - Design of tests for dynamic and modal responses\n - Assess non-conforming parts for potential acceptance\nSupport the design and manufacture of turboprop and jet engine gear boxes\n - Perform root cause failure analysis for parts under test and in service\n - Conduct stress and force analyses\n - Redesign gearbox components for military and civil turboprop engines\n - Present analyses in oral and written formats

  Rolls-Royce

  University of Dayton DIMLab

  Dayton

  OH

  Lead and assist projects relating to kinematics and mechanism design at the University of Dayton DIMLab

  Lead Engineer

  Instructor\n - Taught students from First Year through Senior level including courses in:\n - Design (brainstorming

  conceptual/embodiment design

  and prototyping)\n - Engineering mechanics\n - Programming in MATLAB\n - Modeling and analysis of mechanical engineering problems\nGraduate Research Assistant\n - Conducted research in the design of low degree of freedom mechanisms for complex tasks\n - Fabricated and analyzed prototypes\n - Presented results at conferences and in journal publications

  University of Dayton

  Ph.D.

  Mechanical Engineering

• 2003

  Cornerstone Research Group

  Inc.

  University of Dayton DIMLab

  University of Dayton

  Principal Investigator for Phase I and II SBIR grant: Morphing Aero-structures for a Loitering Autonomous Aircraft\n - Lead the design and testing of a morphing wing prototype while managing a team of co-op students\n - Coordinated research with contacts within the U.S. Air Force (AFRL) and other companies involved in the project\n - Mentored two University of Dayton senior design teams developing a small morphing UAV prototype\nResearch Engineer\n - Assisted research teams within the company focused on applications of proprietary shape memory and dynamic modulus composite materials for civil and defense use\n - Designed and ran experiments for testing prototypes\n - Participated on conceptual and embodiment design teams\n - Wrote grant proposals to government agencies

  winning $750

  000 in Phase I and II SBIR funding

  Cornerstone Research Group

  Inc.

  University of Dayton

  Teach classes on the following subjects:\n- Numerical and Computational Methods\n- Kinematics and Machine Design\n- Experimentation\n- MATLAB Programming\n- CAD and Design\n\nFaculty mentor for industry sponsored Senior level capstone design projects (mechanical

  electrical and computer engineering) run through the University of Dayton Innovation Center (https://www.udayton.edu/engineering/centers/innovation_center/index.php). \n\nTechnical mentor for PhD and Masters students working with the University of Dayton DIMLab (http://academic.udayton.edu/DIMlab/)

  Lecturer

  Dayton

  Ohio Area

• 1999

  English

  German

  BSME

  Mechanical Engineering

• Pro Engineer

  Mechanisms

  Robust Design

  Kinematics

  Finite Element Analysis

  SolidWorks

  Python

  ANSYS

  ProEngineer

  Matlab

  Solidworks

  Singularity-Free RPR and SPS Chains for Actuating Single Degree of Freedom Planar and Spherical Mechanisms

  Andrew Murray

  This paper presents a method of selecting joints relative to\na fixed and moving (coupler) frame that can be used to actuate\na single degree of freedom planar mechanism using a revoluteprismatic-\nrevolute (RPR) chain or a spherical mechanism via a\nspherical-prismatic-spherical (SPS) chain. Given a single degree\nof freedom mechanism

  a moving reference frame attached\nto any link has a motion that can be described with a single parameter.\nA point relative to this moving frame is sought such\nthat it either continually increases or decreases in distance from\na point in the fixed frame over the entire motion. The mechanism\ncan then be moved by placing an actuated prismatic joint\nbetween the two points. Moreover

  the singularities relative to\nthe joints in the original mechanism are not a concern and the\ndimensional synthesis can focus on creating the set of circuitdefect\nfree solutions. From this analysis

  a unique fixed point is\ndetermined relative to two positions and their velocities with the\nfollowing characteristic. All points in the moving reference frame\nthat are moving away from it in the first position are approaching\nit in the second position

  and vice versa.

  Singularity-Free RPR and SPS Chains for Actuating Single Degree of Freedom Planar and Spherical Mechanisms

  Andrew Murray

  Given a single degree of freedom mechanism

  a moving reference frame attached to any link has a motion that can be described with a single parameter. A point relative to this moving frame is sought such that it either continually increases or decreases in distance from a point in the fixed frame over the entire motion. These points can be used to define a revolute–prismatic–revolute (RPR) chain for a planar mechanism or a spherical–-prismatic–spherical (SPS) chain for a spherical mechanism capable of actuating the device over its entire range of motion. Moreover

  the singularities relative to the joints in the original mechanism are not a concern and the dimensional synthesis can focus on creating the set of circuit-defect free solutions. From this analysis

  a unique fixed point is determined in the planar case relative to two positions and their velocities with the following characteristic. All points in the moving reference frame that are moving away from it in the first position are approaching it in the second position

  and vice versa. This point is as critical to the identification of singularity-free driving chains as the centrodes or the poles.

  Singularity Free Revolute–Prismatic–Revolute and Spherical–Prismatic–Spherical Chains for Actuating Planar and Spherical Single Degree of Freedom Mechanisms

  Ernie Havens

  John Reed

  Discussion of the design of a wing capable of changing airfoil shape and chord length using a morphing process. The skin is made from a proprietary shape memory polymer and various potential internal structures and actuation methods are discussed.

  Morphing Wing Structures for Loitering Air Vehicles

  Andrew Murray

  Synthesis of Coupler-Drivers for Four Postition Planar Tasks

  Venkatesh Venkataramanujam

  Pierre Larochelle

  Andrew Murray

  Summary of an NSF research program to design low degree of freedom mechanisms capable of solving complex spatial tasks.

  PODS: Novel Devices for Spatial Assembly Tasks

  Brian Pelley

  John Reed

  Ernie Havens

  Adaptive wing structures

  Andrew Murray

  This work presents a comparison between two actuation\nmethods for planar and spherical four-bar mechanisms. The first\nis actuation by a torque applied at either of the fixed pivots. The\nsecond actuation method uses a linear actuator connected between\nground and the coupler. For any four position task

  planar\nor spherical

  a one parameter set of dyads is found that may be\nused to guide the body through the four positions. Any two of\nthese dyads

  when coupled

  define a potential four-bar solution\nto the task. A sampling across the set of all possible mechanisms\nthat solve the four position task may be compared by analyzing\nthe internal static loads of the four-bar mechanisms. The comparison\nwas conducted to determine if coupler-driven four-bars\nhave reduced internal loading when compared to torque-driven\nmechanisms. Four position tasks were used for comparison of\nmechanisms designed for the same task

  under the assumption\nthat the optimal torque-driven mechanism would have a different\nset of kinematic parameters than the optimal coupler-driven\nmechanism.

  Comparison of Torque and Coupler-Driven as Solutions to Planar Four Position and Spherical Four Orientation Tasks

  David

  Perkins

  Rolls-Royce