• Energy Research

Mechanical vibrations in large structures such as buildings, bridges, dams and critical frequencies in large machinery generally have low frequencies (100Hz-1000Hz). To monitor large areas of such structures we need huge network of low cost, easily manufacturable, self-powered and stand-alone vibration spectrum sensors. The sensors should also consume very little power during their overall operation cycle and have moderately high frequency resoultion. The thesis provides mathematical analysis, design and development of stand-alone, low frequency vibration spectrum analyzer .A mechanically stretched polymer piezoelectric membrane, which has a fixed length and tension, can act as a single frequency detector due to its unique resonant frequency. Stretching multiple ribbons of diffferent lengths and tensions, a vibration spectrum analyzer, which gives the Fourier frequency components present in an arbitrary mechanical input vibration, can be designed. The thesis presents a detailed description of experiments to evaluate a low frequency vibration spectrum analyzer system that accepts an incoming input vibration and directly provides the spectrum as output. Polymer piezoelectric materials being easily manufacturable these sensors can be deployed in wide area sensor networks that monitor large structures. The thesis also shows design of a vibration energy harvesting system based on the concept of harvesting energy at low frequencies. The need for developing such an energy harvesting system arises from the necessity of making the vibration sensor, self-powered. Multiple experimental tests were performed before developing a prototype vibration energy harvesting circuit.

Mechanical vibrations in large structures such as buildings, bridges, dams and critical frequencies in large machinery generally have low frequencies (100Hz-1000Hz). To monitor large areas of such structures we need huge network of low cost, easily manufacturable, self-powered and stand-alone vibration spectrum sensors. The sensors should also consume very little power during their overall operation cycle and have moderately high frequency resoultion. The thesis provides mathematical analysis, design and development of stand-alone, low frequency vibration spectrum analyzer .A mechanically stretched polymer piezoelectric membrane, which has a fixed length and tension, can act as a single frequency detector due to its unique resonant frequency. Stretching multiple ribbons of diffferent lengths and tensions, a vibration spectrum analyzer, which gives the Fourier frequency components present in an arbitrary mechanical input vibration, can be designed. The thesis presents a detailed description of experiments to evaluate a low frequency vibration spectrum analyzer system that accepts an incoming input vibration and directly provides the spectrum as output. Polymer piezoelectric materials being easily manufacturable these sensors can be deployed in wide area sensor networks that monitor large structures. The thesis also shows design of a vibration energy harvesting system based on the concept of harvesting energy at low frequencies. The need for developing such an energy harvesting system arises from the necessity of making the vibration sensor, self-powered. Multiple experimental tests were performed before developing a prototype vibration energy harvesting circuit.

Data Management Plan (DMP) for the HAR4BEST (Design And Optimization Of Small Electromagnetic Harvesters For Vibrational Energy Scavenging) project. Both .pdf (for visualization purpose) and the source .rtf (a FAIR format) documents are uploaded. Project abstract: The HAR4BEST proposal focuses on the development of small electromagnetic vibrational energy harvesters (SEVEHs). These devices collect environmental vibrational energy that, otherwise, will be wasted. Vibrational kinetic energy is harvested from different environmental sources: civil infrastructures (roadways, railways, bridges, buildings), wind and water flow, machine operation in industry, transportation (especially automotive), human motion, among others. The data management plan of the project is being developed taking into account the Open Science practices. The DMP is a living document, which will be updated as required. This work is funded by Spanish Agencia Estatal de Investigación and Ministerio de Ciencia e Innovación MCIN/AEI/ 10.13039/501100011033 and by "European Union NextGenerationEU/PRTR, project TED2021-130884B-I00.

Data Management Plan (DMP) for the HAR4BEST (Design And Optimization Of Small Electromagnetic Harvesters For Vibrational Energy Scavenging) project. Both .pdf (for visualization purpose) and the source .rtf (a FAIR format) documents are uploaded. Project abstract: The HAR4BEST proposal focuses on the development of small electromagnetic vibrational energy harvesters (SEVEHs). These devices collect environmental vibrational energy that, otherwise, will be wasted. Vibrational kinetic energy is harvested from different environmental sources: civil infrastructures (roadways, railways, bridges, buildings), wind and water flow, machine operation in industry, transportation (especially automotive), human motion, among others. The data management plan of the project is being developed taking into account the Open Science practices. The DMP is a living document, which will be updated as required. This work is funded by Spanish Agencia Estatal de Investigación and Ministerio de Ciencia e Innovación MCIN/AEI/ 10.13039/501100011033 and by "European Union NextGenerationEU/PRTR, project TED2021-130884B-I00.

This work deals with improvement construction already of the vibration power generator design. The improvement his feature and search ideal construction with reference to material, proportions and power. Gain here mechanical properties, to come to what best tune up and development of new construction for improved check out characteristics as is achievement. Tuning up of correct parameters proceed by the simulation and modelling in ANSYS and MATLAB environment. Tato práce se zabývá vylepšením konstrukce již navrženého vibračního generátoru. Pojednává o vylepšení jeho vlastností a hledání ideální konstrukce s ohledem na hmotnost, rozměry a generovaný výkon. Zlepšují se zde mechanické vlastnosti, aby došlo k co nejlepšímu naladění a vývoji nové konstrukce pro zlepšení výstupních parametrů, jako je výkon. Naladění požadovaných vlastností probíhá simulováním a modelováním v programech ANSYS a MATLAB. A

This work deals with improvement construction already of the vibration power generator design. The improvement his feature and search ideal construction with reference to material, proportions and power. Gain here mechanical properties, to come to what best tune up and development of new construction for improved check out characteristics as is achievement. Tuning up of correct parameters proceed by the simulation and modelling in ANSYS and MATLAB environment. Tato práce se zabývá vylepšením konstrukce již navrženého vibračního generátoru. Pojednává o vylepšení jeho vlastností a hledání ideální konstrukce s ohledem na hmotnost, rozměry a generovaný výkon. Zlepšují se zde mechanické vlastnosti, aby došlo k co nejlepšímu naladění a vývoji nové konstrukce pro zlepšení výstupních parametrů, jako je výkon. Naladění požadovaných vlastností probíhá simulováním a modelováním v programech ANSYS a MATLAB. A

The effects of nonlinearity, particularly stiffness nonlinearity, has been of concern to structural engineers for many years. Primarily this has been because this type of nonlinearity can cause unpredictable dynamics, and considerable effort is necessary to analyze nonlinear structures. Due to the constant drive to improve the performance and efficiency of structures and mechanical devices, engineers have recently started to investigate whether nonlinearity can be incorporated into structures to provide some benefit. This chapter discusses some of the problems that stiffness nonlinearity can cause, and gives three examples where this type of nonlinearity can be put to good use. The examples are in vibration isolators, vibration absorbers and energy harvesters. If the nonlinearity is introduced in an appropriate way then it should not have an adverse impact on probabilistic prognostics and health management of energy systems.

The effects of nonlinearity, particularly stiffness nonlinearity, has been of concern to structural engineers for many years. Primarily this has been because this type of nonlinearity can cause unpredictable dynamics, and considerable effort is necessary to analyze nonlinear structures. Due to the constant drive to improve the performance and efficiency of structures and mechanical devices, engineers have recently started to investigate whether nonlinearity can be incorporated into structures to provide some benefit. This chapter discusses some of the problems that stiffness nonlinearity can cause, and gives three examples where this type of nonlinearity can be put to good use. The examples are in vibration isolators, vibration absorbers and energy harvesters. If the nonlinearity is introduced in an appropriate way then it should not have an adverse impact on probabilistic prognostics and health management of energy systems.