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Sivak, V. F.; Sivak, V. V.

doi:10.1023/a:1019770206949

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…178 The ratio of vehicles to households has been roughly two to one over the past 20 years, with between 20,000 and 25,000 miles driven per household annually over the last 30 years. 179 This existing fleet of vehicles averaged 11.6 years old in 2016, reflecting a relatively steady increase in vehicle age since 1996, when the average age of vehicles was 8.5 years old. 180 Roughly 62 million vehicles are at least 16 years old.…”

Section: Vehicle Ownership and Usagementioning

confidence: 99%

The Future of Transportation Electrification: Utility, Industry and Consumer Perspectives

Jones

Levy²,

Bosco

et al. 2018

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as well as the head of his own consulting firm focusing on regulatory and policy issues related to the electricity grid and cybersecurity based in Seattle, Wash. Jones served for 12 years on the Washington Utilities and Transportation Commission and served in many advisory roles to federal agencies in the communications and energy sectors. He also served as President of the National Association of Regulatory Utility Commissioners in 2012-13. Jones serves on the Advisory Council of the Electric Power Research Institute and as a Board Advisor to Energy Impact Partners, an infrastructure-focused private equity fund focused on the electricity sector. Vision Ridge/EVgo Jonathan Levy is the Vice President of Strategic Initiatives at EVgo and an Advisor to Vision Ridge Partners, an investment firm focused on sustainable assets, including the controlling position in EVgo. He has been involved with advanced transportation throughout his career, including EVgo activities while working at Vision Ridge as Director of Policy and Strategy until earlier this year. Prior to joining Vision Ridge in 2015, Levy served in a variety of federal government policy and management positions. He started his career on Capitol Hill as a policy advisor to then-Congressman Rahm Emanuel and served in a variety of positions at the U.S. Department of Energy and the White House, concluding his federal service as Deputy Chief of Staff to U.S. Energy Secretary Ernest Moniz. Over the course of his career, Levy has consistently tackled issues at the intersection of policy, politics and execution. Jonathan serves on the Board of Directors of Veloz and Gourmet Symphony. He graduated magna cum laude from Emory University with a B.A. in Political Science.

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Section: Vehicle Ownership and Usagementioning

confidence: 99%

The Future of Transportation Electrification: Utility, Industry and Consumer Perspectives

Jones

Levy²,

Bosco

et al. 2018

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Vibrations of a system of fluid-filled cylindrical shells on an elastic base

Sivak

2004

Int Appl Mech

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Experimental Investigation of the Sensitivity of a Rotating Shell to the Position of Its Axis

Sivak

2005

Int Appl Mech

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It is established that the vibrations of a rotating shell excite the vibrations of the whole system consisting of a cylindrical shell, an electric motor, and a reducer on a common elastic base. It is shown that the vibrational accelerations excited by two different methods approach each other when the angle of the shell axis changes Experimental studies into the dynamic behavior of thin shells of revolution are elucidated is a great many publications, which are reviewed in, e.g., [2,4,8]. It follows from these reviews that the vibrations of rotating shells with added masses have been poorly investigated. In this connection, there is a need for further research into the vibrations of cylindrical shells.Here we discuss the results from an experimental investigation of the effect of point added masses on the natural frequencies of a rotating shell depending on the angle of its axis during resonant vibrations excited with an electrodynamic vibrator.1. The test subject is a fiberglass cylindrical shell of radius R = 16 cm, length L = 90 cm, and thickness h = 0.8 mm with three equal weights Ì 1 , Ì 2 , and Ì 3 , 0.34 kg each. The weights, each having the form of a cylinder with a length of 10.5 cm and a diameter of 23 mm, are evenly spaced along the circumference of the shell at a distance of 3 cm from the upper end. First, the natural frequencies of the shell were determined by the resonance method. Then the shell was inserted by the lower end into circular slots in steel disks filled with Wood metal melt, the upper end remaining free. The disk was fixed to a massive base.To examine the effect of the weights on the minimum natural frequency of the shell-weights system, we used the technique described in [5][6][7]. Vibrations were excited with a vibrator. Its mobile coil, 5.32 g in mass, was attached at the midsection of the shell and oriented in the plane passing through the axes of the shell, one of the weights, and the coil. The natural frequencies of the shell were determined from measured amplitudes À 1 and accelerations à 1 of its free end. The accelerations were measured with a D14 transducer and a vibration meter. The natural frequency f ex as a function of the number of circumferential modes n is shown in Fig. 1. Table 1 collects experimental minimum natural frequencies f min for n = 3 and m = 1 (n is the number of circumferential waves, and m is the number of meridional half-waves). The vibration modes at distances 0.5L, 0.75L, and L from the lower end of the shell were determined by measuring amplitudes at thirty evenly spaced points along the circumference with a noncontact transducer by the method outlined in [5][6][7]. In addition, vibration modes were observed visually. Figure 2a, b, c shows vibration modes in the sections L, 0.75L, and 0.5L, respectively. The arrow indicates the point of application of the exciting force, and the open circles show the weights (the force is applied in the mid-section of the shell).An analysis of the results reveals that the attached weights increase the number of half-wa...

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Cited by 8 publications

References 3 publications

The Future of Transportation Electrification: Utility, Industry and Consumer Perspectives

The Future of Transportation Electrification: Utility, Industry and Consumer Perspectives

Vibrations of a system of fluid-filled cylindrical shells on an elastic base

Experimental Investigation of the Sensitivity of a Rotating Shell to the Position of Its Axis

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