A Tunable Resonance Cantilever for Cardiac Energy Harvesting

Secord, Thomas W.; Audi, Milad

doi:10.1007/s13239-019-00402-9

Cited by 6 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the tendons were modeled on the side of the propulsor, rather than the leading edge, then the model could potentially approximate the pectoral fins of ray/skate-inspired robots, where the relative importance of active and passive control is an open question ( 53 , 54 ). Cantilever-based energy harvesters are also known to benefit from tunable stiffness, especially in dynamic flow environments ( 55 , 56 ). Because our model is derived from thin airfoil theory, it may be particularly relevant to harvesters that harness the aeroelastic vibrations of passive wings ( 57 ) or fluttering flags ( 58 ).…”

Section: Discussionmentioning

confidence: 99%

Tunable stiffness enables fast and efficient swimming in fish-like robots

et al. 2021

View full text Add to dashboard Cite

Fish maintain high swimming efficiencies over a wide range of speeds. A key to this achievement is their flexibility, yet even flexible robotic fish trail real fish in terms of performance. Here, we explore how fish leverage tunable flexibility by using their muscles to modulate the stiffness of their tails to achieve efficient swimming. We derived a model that explains how and why tuning stiffness affects performance. We show that to maximize efficiency, muscle tension should scale with swimming speed squared, offering a simple tuning strategy for fish-like robots. Tuning stiffness can double swimming efficiency at tuna-like frequencies and speeds (0 to 6 hertz; 0 to 2 body lengths per second). Energy savings increase with frequency, suggesting that high-frequency fish-like robots have the most to gain from tuning stiffness.

show abstract

Section: Discussionmentioning

confidence: 99%

Tunable stiffness enables fast and efficient swimming in fish-like robots

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Reference [43] developed an energy harvester utilizing a tunable resonance cantilever mechanism that in turn uses a single magneto-electro-mechanical tool for maximizing the energy-harvesting output by adjusting the resonant frequency (see Fig. 7).…”

Section: Energy Harvesting From Heartbeat (Cardiovascular System)mentioning

confidence: 99%

Recent Techniques for Harvesting Energy from the Human Body

Turab¹,

Owida²,

Al-Nabulsi³

et al. 2022

Computer Systems Science and Engineering

View full text Add to dashboard Cite

The human body contains a near-infinite supply of energy in chemical, thermal, and mechanical forms. However, the majority of implantable and wearable devices are still operated by batteries, whose insufficient capacity and large size limit their lifespan and increase the risk of hazardous material leakage. Such energy can be used to exceed the battery power limits of implantable and wearable devices. Moreover, novel materials and fabrication methods can be used to create various medical therapies and life-enhancing technologies. This review paper focuses on energy-harvesting technologies used in medical and health applications, primarily power collectors from the human body. Current approaches to energy harvesting from the bodies of living subjects for self-powered electronics are summarized. Using the human body as an energy source encompasses numerous topics: thermoelectric generators, power harvesting by kinetic energy, cardiovascular energy harvesting, and blood pressure. The review considers various perspectives on future research, which can provide a new forum for advancing new technologies for the diagnosis, treatment, and prevention of diseases by integrating different energy harvesters with advanced electronics.

show abstract

“…The effect of the dynamic behavior of the myocardium due to heartbeats on the mobility of the leadless pacemaker is of particular importance. 33,34 To obtain complete information about the viscoelastic behavior of the heart muscle, it is necessary to have experimental data over a wide range of time scales. In laboratory research, It is impossible to use a living human cardiac tissue, on the other hand, the dead cardiac muscle does not have the properties of living tissue, and its electromechanical properties change over time.…”

Section: Introductionmentioning

confidence: 99%

Identifying the parameters of viscoelastic model for a gel-type material as representative of cardiac muscle in dynamic tests

Siami

Jahani

Rezaee

2021

Proc Inst Mech Eng H

View full text Add to dashboard Cite

In this paper, mechanical parameters of a calf heart muscle are identified and a gel-type material as the representative of the cardiac muscle in dynamic tests is introduced. The motivation of this study is to introduce a replacement material of the heart muscle to use in experimental studies of the leadless pacemaker. A particular test setup is developed to capture the experimental data based on the stress relaxation test method where its outputs are time histories of the force and displacement. The standard linear solid model is used for mathematical modeling of the heart muscle sample and a gel-type material specimen namely α-gel. Five tests with different strain history [Formula: see text] are performed by regarding and disregarding the influence of the initial ramp of the loading. The mechanical parameters of the standard linear solid model were identified with precise curve fitting. Consideration of the initial ramp significantly influences the consequences and they are so close to their experimental counterparts. The identified parameters of the standard linear solid model by regarding the influence of the initial ramp for the gel-type material are within an acceptable range for the viscoelastic properties of the calf heart tissue. These results show that the gel-type material has the potential to represent the cardiac muscle in the leadless pacemaker experimental studies. Dynamic mechanical analysis is used to characterize the dynamic viscoelastic properties for the gel by utilizing the identified parameters with taking into account the initial ramp in the frequency domain. Results show that Storage modulus, Loss modulus, and Loss tangent are strongly frequency-dependent especially at low-frequency around the heartbeat frequency range (0–2 Hz).

show abstract

A Tunable Resonance Cantilever for Cardiac Energy Harvesting

Cited by 6 publications

References 23 publications

Tunable stiffness enables fast and efficient swimming in fish-like robots

Tunable stiffness enables fast and efficient swimming in fish-like robots

Recent Techniques for Harvesting Energy from the Human Body

Identifying the parameters of viscoelastic model for a gel-type material as representative of cardiac muscle in dynamic tests

Contact Info

Product

Resources

About