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Ahmad Barari

Associate Professor

Mechanical and Manufacturing Engineering
Faculty of Engineering and Applied Science

Integrating data in the design, manufacturing and inspection of products across a digital platform.

  • PhD in Mechanical Engineering University of Western Ontario 2006
  • MSc in Mechanical Engineering Sharif University of Technology 1997
  • BSc in Mechanical Engineering Amirkabir University of Technology 1995

Workshop Chair

University of Technology of Troyes, France June 30, 2016

8th IFAC Conference on Manufacturing, Modelling, Management & Control

A Review on Geometric Tolerances and Surface Integrity in Additive Manufacturing Products

University of Guilan, Guilan, Iran April 29, 2016

Invited Lecture, Faculty of Engineering

Workshop on Additive Manufacturing Additive Manufacturing and 3D Printing

Ottawa, Ontario May 11, 2015

15th IFAC Symposium on Information Control in Manufacturing (INCOM 2015)

Analysis of Nonlinear Oscillation of Circular Curved Carbon Nanotube

Beijing, China August 5, 2013

The 13th IEEE International Conference on Nanotechnology

Analytical Solution for Nonlinear Vibration of Sinusoidal Curved Carbon Nanotube

Montreal, Quebec July 23, 2013

4th Canadian Conference on Nonlinear Solid Mechanics (CanCNSM2013)

Comparing the Uncertainty of Coordinate Metrology as a Function of Sampling Strategy in Optical and Tactile Inspection Systems

San Diego, California July 22, 2013

The 29th Coordinate Metrology Systems Conference (CMSC)

Minimizing Bone Removal Based on Humeral Implant Alignment in Total Elbow Arthroplasty

University of Bergamo, Bergamo, Italy June 17, 2013

International CAD Conference, CAD'13

Substituting Simple Structural Beam-Frame Substructures with Equivalent Beam-Plate Combinations

University of Bergamo, Bergamo, Italy June 17, 2013

International CAD Conference, CAD'13

A Quick Deviation Zone Fitting in Coordinate Metrology of NURBS Surfaces Using Principle Component Analysis 


Evaluation of the tolerance zone using discrete measured points plays a critical role in today’s metrology and industrial applications. The deviation zone is typically evaluated using a fitting method that fits an ideal desired geometry to locate measured points while a function of the Euclidean distances of the measured points to the ideal surface becomes minimum. This paper presents a quick and reliable algorithm called Dynamic Principle Component Alignment (DPCA) for fitting complex surfaces to the coordinate metrology sample points using the information that is dynamically generated by Principal Component Analysis (PCA) of the measurement data and the corresponding fitted geometry.

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Application Framework for Aero-based Design Optimization of Passenger Cars using NURBS 
Journal of Applied Mechanical Engineering


This paper presents a new application framework for aerodynamics-based shape optimization of passenger cars. The rear geometry of a passenger car is the focus of this study due to its significant influence on the aerodynamic characteristics of vehicles.

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Convergence of a Finite Difference Approach for Detailed Deviation Zone Estimation in Coordinate Metrology 


In order to comprehend an entire surface's deviation zone, infinite measured points are required. Using the common measurement techniques through coordinate metrology, a limited number of surface actual points can be acquired. However, the obtained points would not provide sufficient information to examine the geometry thoroughly. A novel approach to predict surface behaviour via Distribution of Geometric Deviations (DGD) is examined in this paper.

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A Unified Approach for Nonlinear Vibration Analysis of Curved Structures using Non-uniform Rational B-spline Representation 
Journal of Sound and Vibration


A novel procedure for the nonlinear vibration analysis of a curved beam is presented. The Non-Uniform Rational B-Spline (NURBS) is combined with the Euler−Bernoulli beam theory to define the curvature of the structure. The governing equation of motion and the general frequency formula, using the NURBS variables, is applicable for any type of curvatures, is developed.

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Global Adaptive Slicing of NURBS Based Sculptured Surface for Minimum Texture Error in Rapid Prototyping 
Rapid Prototyping Journal


This paper aims to propose a global adaptive direct slicing technique of Non-Uniform Rational B-Spline (NURBS)-based sculptured surface for rapid prototyping where the NURBS representation is directly extracted from the computer-aided design (CAD) model.

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A Genetic Programming Approach to Model Detailed Surface Integrity of Additive Manufacturing Parts 


Surface integrity is a crucial issue that needs to be improved in the additive manufactured products. Precise evaluation of surface integrity demands a detailed understanding of the surface behaviour. Optical surface and roughness measurement sensors only provide information on the discrete points measured from the manufactured surface without the details of the surface topography. Throughout this paper, a methodology is developed to approximate the surface behaviour.

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Topologically Optimized Diesel Engine Support Manufactured with Additive Manufacturing 


Additive manufacturing and topological optimization are two key technologies that have good symbiosis. Several issues have been solved in the area of both technologies. Additive manufacturing relaxes the design constraints related to the manufacturability of a part. A diesel engine support is topologically optimized.

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Evaluation of the Surface Roughness of Additive Manufacturing Parts Based on the Modelling of Cusp Geometry 


Most commonly used Additive manufacturing (AM) technologies are developed based on a layered manufacturing process to fabricate 3D models. However, a critical drawback that reduces the surface quality of the AM parts is the staircase effect as a direct result of the layered deposition of the material. The final surface roughness of the products has been a key problem in AM. In this paper, a new approach to model surface roughness in Fused Deposition Modeling (FDM) is proposed.

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Surface Topography of Additive Manufacturing Parts Using a Finite Difference Approach 
Journal of Manufacturing Science and Engineering


Inspection of surface integrity in additive manufacturing (AM) parts essentially needs a detailed understanding of their actual surface topography. Today's optical surface topography and roughness measurement sensors only provide information on the discrete points measured from the manufactured surface and not a detailed reconstruction of the surface topography. This paper presents a finite difference approach for reconstruction of the surface topography using sample measured data points.

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Handling and Safety Enhancement of Race Cars using Active Aerodynamic Systems 
Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility


A methodology is presented in this work that employs the active inverted wings to enhance the road holding by increasing the downward force on the tyres. In the proposed active system, the angles of attack of the vehicle's wings are adjusted by using a real-time controller to increase the road holding and hence improve the vehicle handling.

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First Place Winner

2010 Ontario Centre of Excellence Connection Competition (OCE)

As the Capstone Project’s Academic Advisor, Dr. Barari's student team won the 2010 OCE Connection Competition.

Second Place Winner

Formula SAE 2010 Student Competition

As the Formula SAE Racing Car’s Academic Advisor, Dr. Barari's student team won the 2010 Student Competition held at the University of Toronto.

Teaching Excellence Award 2009

Ontario Tech University June 1, 2009

Awarded for his contributions to teaching in the Faculty of Engineering & Applied Science.

Adjunct Professor

Department of Mechanical and Materials Engineering, University of Western Ontario May 1, 2010

Dr. Barari collaborates on faculty research and supervises the work of graduate students.

Post Processing of Additive Manufacturing ABS Parts Using Chemical Solution $25000

NSERC Engage Grant April 1, 2015

In partnership with Cimetrix Ltd., this research project aims to improve accuracy in the post-processing of 3D printing parts through Precision Addictive Manufacturing (PAM). PAM removes previous design limitations by enabling the development of hybrid materials geared to specific industry needs.

Optimization of the Curing Cycles in Selective Sintering Process $24932

NSERC Engage Grant April 1, 2015

In partnership with Anubis Engineering Solutions, this one-year research project aims to optimize the manufacturing cycle by reducing the amount of costly machine time used while ensuring accuracy and quality control processes.

Integrated Platform for Coordinate Metrology to Enhance Adaptability $100000

NSERC Discovery Grant April 1, 2011

This seven-year intensive research program is focused on coordinate metrology and inspection to improve quality control. Manufactured parts contain errors in their physical characteristics preventing the exact desired shape. Coordinate metrology allows for complex geometric shape deviations to be measured, then modelled, to reduce waste and ensure better process control.

Coordinate Metrology Society

American Society for Precision Engineering

Professional Engineers of Ontario

American Society of Mechanical Engineering

  • Automotive Structural Design (AUTE 4060U)
    This course focuses on design, analysis and manufacture of vehicle structure. Students will learn about the fundamental design aspect in different categories of vehicles and practice design procedures useful for different vehicle structures. The various manufacturing and assembly techniques used in production of the vehicle structure will be introduced. The course contents include a review of fundamental vehicle loads and their estimation, terminology and overview of vehicle structure types including Body-On-Chassis, Ladder Frame, Grillage Frame, Backbone, Monocoque, Space frame, unitary body structures, torsion and bending stiffness, Stiffness optimization, fatigue analysis, Design and analysis of body subassemblies and model variants, sizing of sections and joints, Engineering Materials and their incorporation into vehicle design, Material property charts, Material selection, Auto body design, Crashworthiness and its influence on vehicle design.
  • Engineering Design (ENGR1025U)
    A project-based introduction to the engineering design process, computer-aided drafting, and the use of design tools and software packages for engineering design. Open-ended design-build projects by individuals and groups and written and oral technical communications. Basics of project management including organizing, planning, scheduling, controlling, and application of spreadsheets and project management software.
  • Concurrent Engineering and Design (MECE 2310U)
    This course covers the modern integrated product development process. Unlike the traditional product development approach, concurrent (simultaneous) engineering and design reunites technical and nontechnical disciplines and brings forward a philosophy of cross-functional cooperation in order to create products which meet pre-determined objectives, and are better, less expensive, and more quickly brought to market. It is a process in which appropriate disciplines are committed to work interactively to analyze market and customer requirements in order to improve the end-to-end process by which products are conceived, designed, manufactured, assembled, sold to the customer, serviced, and finally disposed of. The concept of design is presented. Brainstorming, creativity methods, design for manufacturing, design for assembly, design for cost, and design for quality, life cycle design, reverse engineering, and rapid prototyping are addressed. Teamwork and communication skills are developed.
  • Fluid Power Systems (MECE 3320U)
    The course reviews relevant fluid mechanics principles and proceeds with treatments of individual components. Components analyzed include: pumps, actuators, lines, valves and other related components. Discussions of individual components include: principles of operation, mathematical models, and design considerations. Analysis and design of fluid power systems used in industrial and processing equipment. Selected topics to include: positive displacement components, control devices, actuators, fluid transmission and system dynamics.
  • Design for Manufacturing (MANE 4110U)
    This course covers the principles of design for manufacturing and production. Methodologies to enhance awareness of the manufacturing and manufacturability requirements during different stages of the design process. Use of inherent cost and benefits available in the manufacturing processes is studied. Design principles and guidelines for variety of typical manufacturing processes, assembly, disassembly and the role of design for manufacturing in concurrent engineering platform is cover.
  • Advanced Solid Mechanics and Stress Analysis (MECE 4210U)
    Three-dimensional stress and strain analysis; strain energy methods for deflection; asymmetric and curved beams; bending, torsion and shear centers; beams on elastic foundations; thick cylinders; buckling and elastic stability; flat plates.