Tajmar's new model of a Mach Effect Thruster.https://www.researchgate.net/publication/319974638_Mach-Effect_thruster_model
Quote from: Bob012345 on 10/09/2017 06:24 pmTajmar's new model of a Mach Effect Thruster.https://www.researchgate.net/publication/319974638_Mach-Effect_thruster_modelTajmar says only mechanical power, not electrical power, generated by the PZT stack is responsible for the mass fluctuations. Doesn't that imply other mechanical means aside from PZT stacks or PIN-PMN-PT materials might be developed?
Nanotubes could be made to mechanically oscillate at very high frequencies:https://www.nature.com/articles/srep226001.7 MHz is pretty fast for a mechanical oscillation frequency
I'm interested in the possibility, hinted at in the conclusions of the Estes Park workshop proceedings, that Woodward Mach effects could be derived from conventional, textbook general relativity, without advanced waves. What should I read?
Quote from: sanman on 10/13/2017 09:48 amNanotubes could be made to mechanically oscillate at very high frequencies:https://www.nature.com/articles/srep226001.7 MHz is pretty fast for a mechanical oscillation frequencyChip based micro-mechanical resonators might work if the derivative of the mechanical power can be made high enough. Plus all the control electronics can be fabricated with the oscillators. The power doesn't have to be huge but it's rate of change does.
Quote from: Bob012345 on 10/12/2017 07:06 pmQuote from: Bob012345 on 10/09/2017 06:24 pmTajmar's new model of a Mach Effect Thruster.https://www.researchgate.net/publication/319974638_Mach-Effect_thruster_modelTajmar says only mechanical power, not electrical power, generated by the PZT stack is responsible for the mass fluctuations. Doesn't that imply other mechanical means aside from PZT stacks or PIN-PMN-PT materials might be developed?My hypothesis was that it is just another Dean Drive. I had thought of experimenting on it but it seems Tajmar is ahead of me and my plan.
Is it possible to use a rotational oscillation to achieve a similar effect with torque?Instead of a linear oscillation, imagine a device that twists one way, and then twists back the other way. And then likewise you'd be varying the mass on one stroke compared to the return stroke.Would that produce a rotational torque in the same way that the linear oscillation allegedly produces the linear force? Wouldn't the mathematical description be derived in roughly the same way?So I'm imagining this could be used for producing torque to change the orientation of a spacecraft without the use of propellant or reaction wheels.Could a Mach Effect for Torque produce something similar to the Lens-Thirring Effect? (ie. rotational frame-dragging)
I hope so as that's the natural way to use the effect to create an energy generator. I would assume if it really works, it should work in any orientation which implies it would work in a rotational device too. In the Q&A of the recent NIAC presentation they imply energy generation is possible but then claim "There are far more efficient ways of extracting energy. Trying to extract energy from gravitation via the Mach effect is very inefficient". Well maybe now but if we assume the technology they project to make the probe possible ~around 4.5N per KW, it's just a matter of design. And the probe itself ends up generating almost a quarter million times as much kinetic energy w.r.t. the earth frame as total electrical energy input which works out to an average power of 340 GW continuously over the whole 20 year trip. And how does one measure efficiency for a process, that once the engineering of such devices is done, and yes that would be costly, there is no fuel cost and it makes energy anywhere continuously till the parts wear out! Of course it won't make as much energy per device because rotational speeds are limited in practice. It would probably take advantage of advanced flywheel technology.Also, nothing could be simpler than reaction wheels to change the orientation of a spacecraft and the Mach effect would be overkill.
We report molecular dynamics studies of carbon nanotubes as mechanical gigahertz oscillators. Our results show that different oscillatory regimes exist but that sustained oscillations are possible only when the radii difference values of the inner and outer tubes are ~3.4 Å. Frequencies as large as 87 GHz were obtained. Calculated force and frequency values are in good agreement with estimated data from recent experimental investigations.
We present a simple micromanipulation technique to transfer suspended graphene flakes onto any substrate and to assemble them with small localized gates into mechanical resonators. The mechanical motion of the graphene is detected using an electrical, radio frequency (RF) reflection readout scheme where the time-varying graphene capacitor reflects a RF carrier at f = 5-6 GHz producing modulation sidebands at f ± f(m). A mechanical resonance frequency up to f(m) = 178 MHz is demonstrated. We find both hardening/softening Duffing effects on different samples and obtain a critical amplitude of ~40 pm for the onset of nonlinearity in graphene mechanical resonators. Measurements of the quality factor of the mechanical resonance as a function of dc bias voltage V(dc) indicates that dissipation due to motion-induced displacement currents in graphene electrode is important at high frequencies and large V(dc).
Quote from: Bob012345 on 10/19/2017 04:43 pmI hope so as that's the natural way to use the effect to create an energy generator. I would assume if it really works, it should work in any orientation which implies it would work in a rotational device too. In the Q&A of the recent NIAC presentation they imply energy generation is possible but then claim "There are far more efficient ways of extracting energy. Trying to extract energy from gravitation via the Mach effect is very inefficient". Well maybe now but if we assume the technology they project to make the probe possible ~around 4.5N per KW, it's just a matter of design. And the probe itself ends up generating almost a quarter million times as much kinetic energy w.r.t. the earth frame as total electrical energy input which works out to an average power of 340 GW continuously over the whole 20 year trip. And how does one measure efficiency for a process, that once the engineering of such devices is done, and yes that would be costly, there is no fuel cost and it makes energy anywhere continuously till the parts wear out! Of course it won't make as much energy per device because rotational speeds are limited in practice. It would probably take advantage of advanced flywheel technology.Also, nothing could be simpler than reaction wheels to change the orientation of a spacecraft and the Mach effect would be overkill.Well, even reaction wheels can get saturated, and propellant must be expended to desaturate them.What about a rotary device that didn't twist back and forth, but just kept rotating continuously? You would vary energy-potential/mass downward on half of the period, and vary it upward on the other half. Could that create a net force in one direction?
“Graphene is a unique material because, effectively, individual graphene electrons act as though they have no mass. What that means is that the individual electrons always move at a constant velocity,” explains Ham. “But suppose we apply a force, like an electric field. The velocity of the individual electrons still remains constant, but collectively, they accelerate and their total energy increases—just like entities with mass. It’s quite interesting.”
Okay, building further on what I was saying - can we combine the graphene ideas expressed in my last 2 posts?IE.: Can we have our graphene drumskin vibrating/oscillating back and forth along the axis that is orthonormal to its surface -- and while this is going on, we have electrons moving back and forth across the graphene??So the idea would then be that while the graphene sheet is moving one way, we will like our electrons to move masslessly, and then while the graphene sheet is moving back the other way, then we will like our electrons to move back across the sheet in a way that exhibits mass (ie. we would apply electric field for this). And we want all of this to happen at Gigahertz frequency.(Okay, I know you'll probably say there's something obvious I'm neglecting, but try not to bash me like a drum)