Jared Hobeck

Jared Hobeck
Kansas State University | KSU · Department of Mechanical and Nuclear Engineering

Doctor of Philosophy

About

37
Publications
7,298
Reads
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449
Citations
Additional affiliations
April 2014 - June 2017
University of Michigan
Position
  • Fellow

Publications

Publications (37)
Article
Full-text available
In this letter, the authors present a semi-empirical relationship used to predict the velocity at which two adjacent identical cantilevers placed in steady cross-flow begin to experience persistent large amplitude vibrations at a particular combination of flow velocity and separation distance. This recently discovered flow-induced vibration phenome...
Conference Paper
Full-text available
Metamaterial research began with a focus on modifying material properties in the molecular and nanometer scales such that desired physical characteristics including: thermal, optical, electrical, and wave propagation of the modified material outperformed those of the original. In this paper, a metastructure is a metamaterial inspired concept where...
Article
Full-text available
The research presented in this paper aims to improve on the accuracy and computational efficiency of previously reported stochastic models for predicting the electromechanical properties of conductive polymer composite (CPC) materials with nanoparticle constituents. The proposed approach provides a means of quantifying the degree of particle disper...
Article
Wind-induced vibration (WIV) of tall buildings is a major cause of occupant discomfort and potential fatigue damage. Catastrophic failure may also take place at wind speeds that are lower than the design values due to phenomena such as vortex shedding or flutter-induced instabilities. This paper presents a data-driven adaptive control strategy that...
Article
Full-text available
This research presents iterative optimum training (IOT), which integrates deep neural networks (DNNs) and population-based optimization techniques such as genetic algorithms (GAs). The proposed technique reduces the number of experiments needed for training without adding complexity compared with non-iterative DNN-GA techniques commonly used in the...
Article
Full-text available
In-situ resource utilization (ISRU) to refuel rockets on Mars will become critical in the future. The current effort presents a thorough feasibility analysis of a scalable, Matlab-based, integrated ISRU framework from the standpoint of the second law of thermodynamics. The ISRU model is based on existing technology that can utilize Martian resource...
Article
Predictive combustion models assess engine performance for given setpoints by determining the rate of heat release that is governed by the fuel mass burned. Often, simple mathematical functions such as the Wiebe function are used in simulations to provide mass fraction burned values at each integrated step. Despite its popularity, a limitation of t...
Conference Paper
This research details the process and methodology deployed to better understand the arrangement of colloidal carbon black (CB) nanoparticles in a spray-layer-by-layer (SLBL) manufactured conductive polymer composite (CPC). The effects of various SLBL parameters on the qualitative consistency and electromechanical performance of the resulting sensor...
Article
The relatively low energy density of lithium ion (Li-ion) batteries that power small Unmanned Aerial Vehicles (UAVs) limits their operating range. The use of hydrogen can provide a significant range improvement given its magnitude increase in mass and volume specific energy over Li-ion batteries. As a result, this effort investigates the potential...
Conference Paper
Tall and slender buildings often endure disturbances resulting from winds composed of various mean and fluctuating velocities. These disturbances result in discomfort for the occupants as well as accelerated fatigue life cycles and premature fatigue failures in the building. This work presents the development of a smart morphing façade (Smorphaçade...
Article
Full-text available
An experimental study of the single-well and twin-well, also referred to as intra-well and inter-well, respectively, nonlinear dynamics of a bistable composite laminate is presented. An asymmetric four-ply [0/90/0/90] carbon fiber laminate with two cylindrical stable equilibria supported at its center and free at all boundaries is used for the expe...
Article
The capture of energy from vibration of mechanical systems has been extensively studied with the goal of providing power for various microelectromechanical systems. The traditional cantilever beam approach was used as a starting design for more complex, multiple-beam structures like zigzag or spiral geometries. This work presents the orthogonal spi...
Conference Paper
This study is at attempt to explore the nonlinear behavior of bistable composite laminates for vibration energy harvesting. Asymmetric four-ply [0/90/0/90] carbon-fiber plate with two cylindrical stable equilibria supported at its center and free at all boundaries is used for the experimental testing. Macro-fiber composite (MFC) patches are attache...
Article
Full-text available
A common problem in aircraft maintenance is the development and detection of fatigue cracks in structural components with localized high-stress concentration. Traditional non-destructive testing methods are effective in inspecting cracks through an offline manner; however, real-time implementation of these methods is not common. In this contributio...
Article
Periodic structures are growing in popularity especially in the energy harvesting and metastructures communities. Common types of these unique structures are referred to in the literature as zigzag, orthogonal spiral, fan-folded, and longitudinal zigzag structures. Many of these studies on periodic structures have two competing goals in common: (a)...
Conference Paper
Macro-Fiber Composites (MFCs) are a piezoelectric material typically employed in applications ranging from vibration damping to actuation to structural health monitoring. These composites have flown in space but only with thermal protection and for a short duration. They have not been significantly tested under thermally cyclic conditions similar t...
Conference Paper
The research presented in this paper focuses on a unique multifunctional structural design that not only absorbs vibration at desired frequency bands, but also extracts significant amounts of electrical energy. This is accomplished by first designing an array of low-frequency resonators to be integrated into a larger host structure. This array of r...
Article
This paper makes a complete investigation of flexible longitudinal zigzag (FLZ) energy harvesters for the purpose of enhancing energy harvesting from low-frequency and low-amplitude excitation. A general theoretical model of the FLZ energy harvesters with large joint block mass is proposed. In order to verify the accuracy of the theoretical model,...
Article
This paper presents the analytical modeling of orthogonal spiral structures (OSS), a promising option for small-scale energy harvesting applications. This unique multi-beam structure is analyzed using a distributed parameter approach with Euler–Bernoulli assumptions. First, an aluminum substrate is evaluated to determine if the proposed design can...
Article
In this letter, the authors present results of an experimental investigation demonstrating how extreme persistent thermal cycling influences the performance of piezoelectric macro fiber composite (MFC) actuators. More specifically, this research shows how repeated temperature cycling ranging from −60 °C to 90 °C and from −50 °C to 150 °C affects an...
Article
This paper presents an analytical and experimental investigation of a flow-induced vibration phenomenon referred to as dual cantilever flutter (DCF). The purpose of this research is to introduce the concept of DCF and to help isolate and understand key components that cause it. If unaccounted for, vibration produced by DCF has the potential to caus...
Article
Measuring high-intensity turbulence with fast response pressure probe sensors has proved to be an effective and accurate technique; unfortunately, according to the available literature, most pressure probe research focuses primarily on high-velocity (>100 m/s) applications. Commercially available pressure probe sensor systems are available; however...
Conference Paper
Research presented in this paper focuses on the experimental and theoretical analysis of a compact, nonlinear, broadband energy harvesting device. Cantilevered structure zigzag beams have been shown to have natural frequencies orders of magnitudes lower than traditional cantilever beam geometries of the same size. Literature has also demonstrated t...
Conference Paper
This paper presents an experimental and theoretical analysis of a novel metamaterial-inspired distributed vibration suppression system. The proposed research takes advantage of uniquely designed cantilevered zigzag structures that can have natural frequencies orders of magnitude lower than a simple cantilever of the same scale. A key advantage of t...
Article
Extensive research has been done on the topics of both turbulence-induced vibration and vibration based energy harvesting; however, little effort has been put into bringing these two topics together. Preliminary experimental studies have shown that piezoelectric structures excited by turbulent flow can produce significant amounts of useful power. T...
Conference Paper
This paper presents the first documented investigation of a flow-induced vibration phenomenon referred to as dual cantilever flutter (DCF). First observations of DCF occurred unexpectedly in wind tunnel experiments where two identical cantilever beams began to experience flow-induced, large amplitude, persistent vibrations. These vibrations began w...
Thesis
Full-text available
The primary objective of this research is to develop a deploy-and-forget energy harvesting device for use in low velocity, highly turbulent, and unpredictable fluid flow environments. The work presented in this dissertation focuses on a novel, lightweight, highly robust, energy harvester design referred to as piezoelectric grass. This biologically...
Conference Paper
Full-text available
This paper discusses the design and development of a novel deploy-and-forget, lightweight, robust energy harvester for remote, unmanned, and uncontrolled environments. The biologically inspired harvester design concept consists of an array of over one hundred piezoelectric cantilevers, and has been aptly named piezoelectric grass. Presented in this...
Conference Paper
This paper investigates the structural dynamic characteristics of laminate beams with various types of damage. More specifically, this work focuses on modeling delaminations of various sizes and locations within cantilevered laminate beams. Presented here is a Rayleigh- Ritz model which accounts for transverse and axial beam deformation as well as...
Conference Paper
Preliminary experimental studies have shown that piezoelectric structures excited by turbulent flow can produce significant amounts of useful power. The research presented in this paper could benefit applications such as powering self-sustained sensor networks in small rivers or air flow environments where turbulent fluid flow is a primary source o...
Article
The primary objective of this research is to develop a deploy-and-forget energy harvesting device for use in low-velocity, highly turbulent fluid flow environments i.e. streams or ventilation systems. The work presented here focuses on a novel, lightweight, highly robust, energy harvester design referred to as piezoelectric grass. This biologically...
Conference Paper
Full-text available
This paper introduces an experimental study on the energy harvesting potential of large arrays containing up to 112 flexible piezoelectric structures. The ultimate goal is to estimate power output of an array given structural and fluid properties along with flow velocity and array configuration. While the work presented here will focus primarily on...
Conference Paper
Measuring highly turbulent fluid flow is challenging, especially in cases where the turbulence intensity exceeds acceptable limits for hotwire anemometry techniques. Using fast response pressure probes is an effective and well documented turbulence measurement method; however, there is little literature about pressure probes capable of measuring tu...
Conference Paper
Turbulence-induced vibration is generally considered undesirable, and is a phenomenon that if not properly anticipated can lead to catastrophic structural failure. From an energy harvesting perspective however, these types of vibrations have been found to be quite valuable. Turbulence can greatly diminish the performance of traditional fluid flow e...

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