Devin Knowles Email & Phone Number

Vancouver, Washington

Ink Delivery System design engineer - Leading design and development initiatives of new and innovative components, systems, and manufacturing techniques for air and ink fluidic systems within inkjet printers- Investigation of new materials for use in ink systems- Procuring and evaluating new sensors for characterization tooling- Development of LabVIEW applications and VB. NET programs for fluid systems characterization

Vancouver, Washington, United States

Lead designer of a system for heating arrays of liquid samples within a specialty microfluidic device- Design of FPC heater elements, machined heat sinks, cable harnesses, high temperature plastic injection molded components, circuit board geometry and connector placement, and machined housings- Developed analytical transient heat flow models which allowed for appropriately sizing heaters, influenced mating geometries within the heated samples, and guided heating algorithm development- Created characterization fixtures and software applications for assessing heater performance

Vancouver, Washington, United States

Mechanical designer for fluidic systems within PageWide A3 printers-Modeled complex fluidic network in Python to inform architectures about flowrates, pressures, pumping power needs, and potential issues with flow restrictions and flow reversals- Designed a high flow diaphragm pump for extracting ink from a supply- Developed LabVIEW applications for controlling fluidic networks, and monitoring pressures within the ink delivery system- Led reliability testing efforts for understanding pumping limitations, component wear, pressure management, and sources of system leaks- Sourced new leak test tools and methodologies which reduced tooling costs, and improved consistency within system leak testing and characterization

Vancouver, Washington, United States

Mechanical design engineer for PageWide A4 printers- Owner of scanner and ADF system through product ramp, sustaining, and design improvement/cost reduction efforts- System engineer for all aspects of print system (paper path, cosmetic case parts, ink transport system, and service components) supporting current production and design improvement initiatives- Collected and analyzed field data for prioritization of design projects to address the system's top field failure modes- OEM product development for specialty systems with value added functionality: ultrasonic sensors for sheet detection; time-of-flight sensors for media level detection; and branding of case-parts

Portland, Oregon Area

• Architected multiple bicycle helmet liner systems to address linear and rotational impacts, prototyped and tested materials for best impact absorption and manufacturability, and selected a custom designed cellular material which is now used in Bontrager WaveCel bicycle helmets• Operated machine shop equipment including CNC milling machines and lathes for prototype and test fixture fabrication, enabling rapid development of new impact liner materials• Conducted material strength and fatigue tests using Instron load-frames and designed bone-plates, screws, and surgical instrumentation to support successful FDA 510(k) clearance of a fracture fixation system

Lausanne Area, Switzerland

• Optimized wind tunnel test section geometry for flow uniformity, achieving velocity deviation less than 1% throughout the length of the 28 meter test section.• Measured boundary layer growth in the wind tunnel test section using pitot-static probes and produced reports detailing and summarizing the boundary layer development.• Conducted study on convergence of flow measurement statistics, identifying the minimum sample size requirements for obtaining turbulent statistics with a set confidence level.

Portland, Oregon Area

• Simplified and reduced complexity of a tissue engineering test device by designing plastic injection molded components, sheet metal, and selecting linear actuators which allowed for design re-use, and modularity within the device architecture• Developed an impact test software suite in LabVIEW for synchronization of accelerometers and high-speed cameras which streamlined testing, improved test repeatability, and reduced overhead in post-processing test data• Designed components for CNC machining, plastic injection molding, and sheet metal forming• Managed and maintained large complex assemblies within SolidWorks

Portland, Oregon Area

• Assisted in the daily operation of a full-scale wind tunnel used to test aerodynamics of heavy-duty tractor-trailer vehicles• Developed tooling and methods for measuring the air mass flow rate through truck radiators using LabVIEW as a software interface, and constructing a frame of vane anemometers to fit within the region of interest within the truck engine• Established methods of data collection, processing, and safe use of a newly acquired laser particle image velocimetry system• Collaborated with engineering staff from various departments for mitigation of noise and vibration, water seal issues, and component optimization