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My family and I recently took the Argosy Lock Cruise from Lake Union, through the Hiram M. Chittenden Locks, to the Seattle Waterfront, aboard the Goodtime III. The ship’s main engines are Caterpillar 3408’s coupled with Twin Disc MG514 reduction gears. Auxiliary power is supplied… Read more

This is my current vehicle. With the car parked, I opened the hatch door and sat down on the cargo compartment floor facing outward with my feet on the ground. I then used my legs to move my gluteus maximus up-and-down a few times while… Read more

I recently exercised on the treadmill at Rachel’s Body Shop Gym with an inclination of 3% and a speed of 3.6 mph. I measured the resulting vibration with my Android Smartphone which was mounted against the console screen. My footfall or step frequency was about… Read more

The Green River Bridge is a reinforced concrete structure with an expansion joint on its West end. The joint allows the concrete to naturally expand and contract without cracking as the deck undergoes thermal changes and other loading conditions. Passenger cars have very minor dynamic… Read more

The orange block near the seat post is a Slam Stick X accelerometer. I recorded the frame vibration as I rode the bike over a gravel road adjacent to the Green River in Kent, WA at 10 mph. The time history and power spectral density… Read more

Pedestrian tunnel below Hayden Rd, Scottsdale, Arizona The tunnel is north of Indian School Rd & south of Camelback Rd. It is connected to the Indian Bend Wash which has a series of parks and a golf course along its length. The tunnel is about… Read more

This is the spectral analysis of the refrigerator in my allergist’s office that stores the allergen doses, as measured with my Smartphone. Spectral peaks occur at 60, 129, 133.5, 267, 401 & 641 Hz. The 133.5 Hz peak has integer harmonics at 267 & 401… Read more

Cavitation is the formation of vapor bubbles within a liquid at low-pressure regions that occur in places where the liquid has been accelerated to high velocities, as in the operation of centrifugal pumps, water turbines, and marine propellers. The water jet slows down after traveling… Read more

Argosy Cruises’ Salish Explorer Passenger Ship (Image courtesy of Vessel Finder) This ship is used for tours around the Puget Sound waterways in the Seattle area. My family and I had the opportunity to take a ride on this ship recently. The Salish Explorer is… Read more

I had the opportunity to donate blood recently inside this diesel bloodmobile. The vehicle had an onboard generator to provide electrical power for the lights, refrigerator, and other equipment. The generator produced vibration spectra mainly at ~ 60 and 120 Hz which could be both… Read more