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However, at the same level of colored noise power, the performance is increasingly degraded as noise correlation is spread over more noise samples
It is shown that for these, the product of voids content and thickness is a good descriptor of noise reduction.
The results show that it also has a good noise-robustness.
The technique also shows good noise tolerance characteristics.
Good performance and valuable noise characteristics are achieved.
Proceedings ArticleDOI
Feiyan Mu, Jiafen Zhang, Jing Du 
27 Jun 2011
6 Citations
Simulation results show that this technology can reach good test accuracy, against both white noise and colored noise.
Our treatment of phase noise due to colored-noise sources is general, i. e., it is not specific to a particular type of colored-noise source.
The high performance and good robustness provide with great prospect to scavenge the noise energy in environment.
Given that blue noise is a limiting case of green noise, this new technique can even create blue-noise masks.

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How efficient is to use piezoelectricity to harvest energy from vibrations?
4 answers
Piezoelectricity is an efficient method for harvesting energy from vibrations. Piezoelectric materials have received significant attention due to their higher conversion efficiency. The use of piezoelectric cantilevers in vibration energy harvesting has been explored, and parameters such as length, width, and thickness have been investigated for energy conversion and performance. By optimizing the design of piezoelectric cantilevers, it is possible to achieve high power density and a broad frequency bandwidth for energy harvesting. The combination of width-splitting methods and asymmetric mass in double-cantilever-beam designs has shown promising results in harvesting more ambient energy from vibrations with multiple-frequency excitation. Overall, piezoelectric energy harvesting from vibrations offers a viable and efficient approach for generating electrical energy.
Advancements in wireless power transfer and energy harvesting?
4 answers
Advancements in wireless power transfer and energy harvesting have been a topic of significant interest and research. Various technologies and strategies have been explored to overcome the limitations of traditional methods. One approach is the use of radio frequency (RF) energy harvesting and wireless power transmission (WPT) technologies, including near-field and far-field systems. Another area of focus is the development of textile-based wireless energy harvesting architectures, which offer seamless integration into clothing and multiple harvesting units for enhanced power output. Distributed sensor networks also benefit from wireless power transfer and energy harvesting technologies, as they can overcome the limitations of energy-constrained sensor nodes and enable longer operational lifetimes. Additionally, efficient power allocation algorithms, such as the energy poverty-based device selection (EPDS) strategy, have been proposed to support the perpetual operations of Internet of Things (IoT) devices. These advancements in wireless power transfer and energy harvesting have the potential to revolutionize various applications, including wearable electronics, IoT devices, and distributed sensor networks.
What is pvdf?
5 answers
PVDF, or polyvinylidene fluoride, is a thermoplastic polymer that is widely used in biomedical applications. It is a material with good mechanical characteristics and can develop structures similar to native tissues, making it suitable for tissue engineering. PVDF is also known for its piezoelectric properties, which make it capable of converting mechanical energy into electrical energy. This property has led to its use in advanced sensing and energy storage systems. PVDF has excellent thermal stability, mechanical strength, and dielectric properties, making it a versatile material for various applications. It is particularly suitable for energy harvesting devices, sensors, actuators, and biomedical engineering. The development of PVDF as a piezoelectric material has opened up new possibilities for flexible energy harvesters, especially in the form of electrospun webs. Overall, PVDF is a promising material with a wide range of applications in the fields of biomedical engineering, energy harvesting, and sensing.
Acoustic prediction of brushless motors?
4 answers
Acoustic prediction of brushless motors is an important aspect for machine manufacturers and users. Several papers discuss the prediction of noise generated by permanent magnet (PM) brushless motors. These papers propose different approaches to predict the noise of magnetic origin produced by PM brushless motors. They calculate the sound power level (SWL) based on magnetic field analysis, radial forces, natural frequencies, and radiation efficiency coefficient. The accuracy of analytical and numerical noise prediction methods is also discussed. Additionally, some papers focus on understanding the mechanisms behind the generation of noise in brushless motors. They investigate the acoustics characteristics of the motors and identify electromagnetic torque ripples as a major noise source. The relationship between motor noise and structural dynamics is also explored. Furthermore, the use of surrogate models is proposed to predict acoustic noise in brushless motors, which can significantly reduce computational effort for design and optimization problems.
How can piezoelectric flooring be used to generate power?
5 answers
Piezoelectric flooring can be used to generate power by utilizing the piezoelectric effect of certain materials. When pressure is applied to these materials, they generate electrical energy. This concept can be applied to flooring by using piezoelectric sensors that capture the electrical energy generated by the pressure of footsteps. The captured energy is then transformed into an electrical charge by a transducer. This technology can be implemented in areas with high pedestrian flow, such as footpaths, treadmills, city malls, and shopping complexes. By placing piezoelectric sensors in these locations, a significant amount of mechanical or heat energy, which is otherwise wasted, can be converted into useful electrical energy.
What are the potential applications of a piezoelectric power-generating floor?
5 answers
A piezoelectric power-generating floor has potential applications in places with high pedestrian flow such as subways, train stations, shopping malls, footpaths, treadmills, city malls, and shopping complexes. It can convert the mechanical energy of people walking on the ground into electrical energy and store it. The floor sensors catch the electrical energy generated by the pressure, and a transducer transforms it into an electrical charge. This energy can be used to reduce electricity consumption and comply with the requirements of today's society for environmental protection and energy saving. The piezoelectric power-generating floor can also be used to power wireless transmitters without the need for an external power supply. Additionally, it has the potential to locate the user's current position and provide appropriate services for intelligent building applications.
What is stochastic resonance?
5 answers
Stochastic resonance is a phenomenon where the addition of noise improves the performance of a system by amplifying a weak input signal. It has been observed in various systems, including trapped-ion oscillators, organic field-effect transistors, magnetic transitions in atoms, liquid crystal light valves, and dynamic systems with multiplicative noise. Stochastic resonance can enhance signal processing with low energy consumption and has applications in areas such as pattern formation, neural systems, microelectromechanical systems, and image processing. It can be induced by external noise or high-frequency excitations, and the effects of stochastic and deterministic excitations on different systems have been studied. Stochastic resonance provides a way to improve the response or signal-to-noise ratio of a system, making it useful in various fields of science and technology.
How to do RF Energy Harvesting?
5 answers
RF energy harvesting can be done by designing and fabricating a system that can scavenge ambient RF signals and convert them into usable energy. The system typically consists of an antenna to receive the RF signals, a rectifier to convert the RF waves into DC voltages, and energy storage elements such as supercapacitors or rechargeable batteries to store the harvested energy. The efficiency of the RF energy harvesting device can be analyzed and compared to simulated values, with average power efficiencies ranging from 38.2% to 82% observed in laboratory setups. The harvested energy can then be used to power low-energy devices, such as IoT devices, eliminating the need for batteries and reducing environmental pollution caused by battery waste. RF energy harvesting is a promising alternative for extending the lifetime of power-constrained wireless networks and has gained interest in various industries, including telecommunications.
How to build an all-digital PLL for clock synthesis?
4 answers
To build an all-digital PLL for clock synthesis, a few methods have been proposed in the literature. One approach is to use a fully synthesizable description of a digital controlled oscillator (DCO) with a variable length ring oscillator (VLRO) as the coarse part and a fine-tune unit based on a path selector of different pin-to-pin delays in a NAND standard cell. Another method involves using a self-calibrated hierarchical Time to Digital Converter (TDC) in the ADPLL design, along with two digitally controlled oscillators to cover a wide range of frequencies. Additionally, a discrete-time framework based on nonlinear stochastic iterating maps has been proposed for modeling and studying ADPLL networks, allowing for the optimization of control parameters and synchronization in frequency and phase. Furthermore, an ADPLL utilizing the successive approximation (SAR) algorithm has been presented, which includes a high-frequency resolution digitally controlled oscillator, a time-to-digital converter, a frequency detection divider, and a SAR controller. Mathematical models have also been derived for ADPLLs employing time-to-digital phase detectors, providing benefits for simulation and design.
How can piezoelectric sensors be used to generate power from footsteps?
5 answers
Piezoelectric sensors can be used to generate power from footsteps by utilizing the piezoelectric effect of certain materials. When these materials are subjected to mechanical stress, such as the pressure from footsteps, they generate an electrical charge. This charge can be captured by piezoelectric sensors embedded in the flooring or platforms where there is significant foot traffic. The sensors convert the mechanical energy from the footsteps into electrical energy, which can then be stored or used to power various devices or systems. Studies have shown that different configurations of piezoelectric sensors, such as series-parallel combinations, generate more voltage and are more stable compared to other configurations. Experimental analysis and mathematical modeling have been used to analyze the behavior and power generation capacity of piezoelectric elements in footstep power generation systems.
How can piezoelectricity be used to generate electricity?
5 answers
Piezoelectricity can be used to generate electricity by utilizing the piezoelectric effect of certain materials. This effect allows these materials to generate an electrical charge when subjected to mechanical stress or vibrations. One way to harness this energy is through the use of piezoelectric transducers, which can convert mechanical energy into electrical energy. These transducers can be placed in areas with high population density, such as footpaths, treadmills, and shopping complexes, where there is significant crowd movement and mechanical energy is wasted. Another approach is to incorporate piezoelectric sensors into flooring, which can capture the electrical energy generated by the pressure of footsteps and convert it into an electrical charge. These methods offer a sustainable and economically feasible solution for generating electricity from human locomotive energy and can contribute to the shift towards renewable energy sources.