Timothy Stevens Email & Phone Number

San Diego, California, United States

-Designed and employed fixtures for 4680 cell characterization including thermal characterization and gas analysis.-Managed and applied cell-level abuse testing procedures for prototype 4680 program.-Defined validity ranges for sensors in 4680 abuse/safety testing following sensor characterization.-Developed rolling buffer DAQ in LabVIEW to record high speed data before a trigger signal is sensed. -Designed a controller to heat samples for material characterization at elevated temperatures.

Arlington, Texas, United States

-Assisted Dr. Woods with research pertaining to modeling the dynamics of choked and un-choked compressible flow.-Tested for fluid impedance of numerous radiators and fans using a flow bench with a variable series resistance.-Mentored undergraduate capstone teams pertaining to race-car design, manufacturing techniques, electrical safety, structural design, and vehicle dynamics.

Arlington, Texas, United States

-Operated subtractive manufacturing machines to create parts for departments across the university as well as some clients external to UTA. -Capable of operating a standard knee-type vertical milling machine, manual lathes, and CNC milling machines. Also proficient in using saws, grinders, welders, shears, breaks, and punches.-Learned to create CNC programs using GibbsCAM.-Worked with faculty to produce parts with necessary accuracy for their applications while reducing cost where possible.

Arlington, Texas, United States

-Determined data-driven performance targets given an unfamiliar EV platform.-Designed electric powertrain for FSAE race-car, capable of 80kW (peak), operating at a max bus voltage of 504V, interfacing COTS components.-Designed HV battery pack mitigating thermal and electrical safety concerns while maintaining high structural stiffness and ensuring ease of maintenance and elegant systems integration.-Designed various electrical safety systems.-Managed an inter-disciplinary team of engineers to ensure timelines and deliverables were appropriate and met at a beneficial pace. We built a 1st-year EV FSAE car which passed all portions of technical inspection, finished endurance, won the efficiency event, and finished 9th overall at the 2023 FSAE competition.

Arlington, Texas, United States

-Designed an actively controlled electro-pneumatic drag reduction system for a FSAE race-car using an analog computer and accelerometer. The computer sensing and wing actuation respond to a typical on-track step input within 40ms.-Designed an accelerometer sensor board, with a 3rd order low-pass analog filter optimized for autocross racing of aero race-cars, which interfaces with a commercial automotive DAQ system.-Designed a frequency sensing bar graph meter using low-cost analog circuitry for use on race-cars to sense and display engine speed with low latency.-Designed a constant speed controller for a Clayton water dynamometer using PWFM (aka bang-bang) control methods.-Integrated a Kistler pressure transducer into a Yamaha R3 cylinder head for measuring combustion pressures and evaluating engine performance to optimize ignition timing.-Built a hydraulic test bench and used it to characterize brake proportioning valves.

Arlington, Texas, United States

-Oversaw a team of 20+ engineers to meet performance and timeline metrics while building an FSAE car with a novel engine package. By utilizing a turbocharged Yamaha R3 engine, we were able to achieve the same peak power as our benchmark engine, a CBR600RR, while reducing the overall vehicle weight by 70 pounds. Furthermore, the smaller size allowed for a more compact suspension and chassis configuration.-Oversaw the integration of different system subteams within the design team, ensuring an elegant and effective design. Where necessary, communication was brokered between the subteams to develop mixed-purpose components, reducing complexity and weight of the race-car.-Managed manufacturing timeline to reduce downtime and assisted with CNC machining and welding.-Designed a new rear suspension configuration to take advantage of smaller engine package, reducing weight and the vehicles polar moment of inertia in yaw.-Organized timeline of design and construction such that the team would have an unrivaled amount of time for testing and validation of their designs.-Designed bespoke helical differential for use on FSAE race-cars which outperforms commercial alternatives in every category. Components were combined for common functions to reduce the number of sealing points and allow for more effective load transfer, producing a differential package which never leaks fluid. The differential features higher stiffness and strength than commercial alternatives with a 20% weight reduction.

Arlington, Texas, United States

-Responsible for the structural and kinematic design of the suspension and steering subsystems for a FSAE race-car using SLA double wishbone, pullrod actuated suspension. Kinematic designs were evaluated using MSC's Adams Car simulations to minimize variance of key tire orientation parameters, weighted by the time spent in a given maneuver and the normal load present. Stiffnesses were selected based on a tradeoff between minimizing normal load variation and maximizing high frequency response.-Analyzed structural performance of control arms and uprights to assure material is used effectively providing high specific strength or specific stiffness.-Developed a new welded-steel upright package which better fit the manufacturing limitations of our team. The specific strength and specific stiffness of the assembly was maintained or improved upon from the benchmark set by previous CNC-machined aluminum upright designs.-Tuned 14+ suspension adjustments to achieve appropriate transient response and neutral handling in many diverse scenarios.

Arlington, Texas, United States

Arlington, Texas, United States

Selma, Texas, United States

Doctor Of Philosophy - Phd, Mechanical Engineering

Activities and Societies: UTA Racing FSAE TeamGPA: 3.7 / 4 Research focus: Vehicle Dynamics, Electric Vehicle Powertrains, Control Systems

Master Of Science - Ms, Mechanical Engineering

Activities and Societies: UTA Racing FSAE TeamGPA: 3.7 / 4 Research focused on automotive, control systems, and electrical engineering.

Bachelor Of Science - Bs, Mechanical Engineering

Activities and Societies: UTA Racing FSAE TeamGPA: 2.9 / 4 Studies beyond class work focused on FEA, kinematic design, and high-level.

Certificate, Automotive Engineering

High School Diploma, 9-12