Browsing by Author "Garland, Philip"

Now showing 1 - 4 of 4
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    Baja suspension
    (University of New Brunswick, 2014) Caissie, Chris; Sheasgreen, Travis; Owusu, Bismark; Garland, Philip
    The design project chosen by group 3 was to design a suspension system of the Baja vehicle. The system must be able to withstand and work properly in the conditions expected in a typical race that a Baja vehicle would participate in. The system must be within the SAE (Society of Automotive Engineers) rules on the dimensions of the vehicle and safely support the driver and vehicle through any obstacles that the vehicle may encounter. The project has a budget of $3333, which will be used to buy shock absorbers and control arms. To meet the design criteria several design constraints were made. The ride height was set to 6 in. This will keep the vehicle chassis above most obstacles and provide enough distance to prevent bottoming out of the vehicle. All parts to be bought and manufactured have been chosen to fit into the budget. A settling time of the shock absorbers was chosen to be approximately 2 seconds. This will be quick enough to allow the vehicle to recover at a reasonable rate and slow enough to avoid any serious forces or vibrations placed on the driver or vehicle. The camber applied will be negative so to give the vehicle stability at all times. The suspension will consists of an independent system, including one shock absorber for each wheel. The control arms will be double A-arms for the front and back. The shock absorbers selected are fox float R 3. These consist of an air spring instead of a conventional metal spring. The air spring can be easily adjusted and gives a smoother ride than metal coils. The dimensions will be finalized upon completion of the Baja chassis. A dynamic analysis of the system has been done and general outputs of the system have been found and analyzed. Testing of the shocks was done, varying the pressure of the shocks and also changing the masses. The results are analysed.
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    Science East harmonograph
    (University of New Brunswick, 2016) Smith, Colby; McWilliams, Ian; Uddin, Bilal; Garland, Philip
    A harmonograph is a device that uses swinging pendulum motion to draw complex geometric patterns, known as Lissajous curves. This device is typically found in many science exhibitions all over the world. We have been tasked by Science East to design and build a two-pendulum harmonograph. The new device will replace their existing three pendulum harmonograph which is prone to continuous failure due to defects in its structure. The new design contains gimbals as pendulum pivots allowing the range of motion required and steel for general construction to improve overall robustness. Calculations have been performed to demonstrate that the selected pillow block bearings will not wear out during the device’s lifetime; pivoting joints will not be at risk of failure due to stresses imparted, and that the table will adequately support the device and other additional stresses caused by visitors to the center. Construction and testing have proven the device works as intended meeting the client’s requirements.
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    The validation and development of an inline piezoelectric force transducer
    (University of New Brunswick, 2022-08) Parkman, Travis David; Garland, Philip; Simoneau, Andy
    The inertial effects present in a commercial dynamometer signal were diagnosed using experimental modal analysis (EMA) and a Timoshenko beam (TB) model. The model accurately predicted the tool tip’s flexural vibration in both directions. The EMA results provided evidence that the tool tip’s transverse vibration had a direct effect on the dynamometer’s measured force signal. Model predictions described this effect as well, however had limited accuracy at higher frequencies and near system resonances, such as the tool arm’s flexural mode and the natural frequency of the dynamometer’s cover plate. Using this model, the effect of system dynamics were identified in orthogonal cutting experiments. The model was able to estimate the response of the tool tip during turning, and was able to predict the response as the tool length changed. The tool arm’s vibration would resonate near the model’s predicted natural frequencies. Similar to the model and EMA results, the dynamometer’s response was affected by tool arm length changes. However, the experimental modal results showed a stronger correlation. The predicted results from the impact hammer tests and TB model were then used to reduce the inertial effect present through the direct inversion approach, which had limited success near the system’s resonances. Predicted correction functions from the Timoshenko model were tested, but deemed inferior to experimentally calculated functions. Lastly, the concept of an inline piezoelectric transducer (IPT) to provide accurate force measurements was assessed. The IPTs, which were mounted on the insert’s bottom and back side, were calibrated through a set of hammer impulses. These results showed that the IPTs were less sensitive to inertial effects compared to the dynamometer. After successfully calibrating the IPTs, they were used in orthogonal cutting experiments. Collected results from the IPTs were compared to the dynamometer’s readings and showed accurate results with a limited bandwidth of 500 to 2000 Hz. Results from the Timoshenko model and prototype IPT design were deemed a success and with future improvements could be applied to machining practices. These improvements are listed in the Closing Remarks, Chapter 7.