This paper presents the application of the Pareto-based multicriteria optimization technique to problems of increasing the efficiency of piezoelectric generators(PEGs).The optimization problem was solved for two types...This paper presents the application of the Pareto-based multicriteria optimization technique to problems of increasing the efficiency of piezoelectric generators(PEGs).The optimization problem was solved for two types of generators:cantilever and stack.For the cantilever generator,the task was to optimize the design in such a way as to obtain the maximum output power for a given mechanical excitation.The optimization process was divided into several stages,which significantly reduced the amount of calculations.The task of optimizing the stack type for a given form of mechanical loading consisted in finding the geometric parameters of the generator at which the output voltage and power would be maximum.In the result of solving both problems,sets of geometric design parameters of PEGs were obtained,on the basis of which efficient transducers can be developed for specific operating conditions.It turned out that this technique is more suitable for optimizing the design of cantilever generators than for stack ones in given constraints.The solution of both problems was realized using the finite element method.展开更多
Study of the fatigue endurance and mechanical strength of solid solutions of the PZT-PZN-PMN system,modified with Ba and Sr,corresponding to the formula(Pb_(1-a_(1)-a_(2))Sr_(a_(1))Ba_(a_(1)))[Ti_(x)Zr_(y)<(Nb_(2/3...Study of the fatigue endurance and mechanical strength of solid solutions of the PZT-PZN-PMN system,modified with Ba and Sr,corresponding to the formula(Pb_(1-a_(1)-a_(2))Sr_(a_(1))Ba_(a_(1)))[Ti_(x)Zr_(y)<(Nb_(2/3)Zn_(1/3))(Nb_(2/3)Mg_(1/3))>_(1-x-y)]O_(3),with a_(1)=0.02÷0.12;Da_(1)=0.02,a_(2)=0.0036÷0.073;x=0.385÷0.430,y=0.402÷0.447 is presented.It is shown that the evolution of the polarization characteristics with an increase in the number of repolarization cycles,n,is characterized by two sections:slow fatigue and logarithmic evolution.It was found that an increase in the strontium content shifts the beginning of the logarithmic stage towards to the large n.It is shown that an increase in the average grain size decreases the mechanical strength.A conclusion is made about the expediency of using the obtained data in the development of devices operating in power modes.展开更多
基金The reported study was funded by RFBR according to the research projects Nos.18-38-00912 mol a,19-08-00365 and by Russian Academy of Science(project A16-116012610052-3).
文摘This paper presents the application of the Pareto-based multicriteria optimization technique to problems of increasing the efficiency of piezoelectric generators(PEGs).The optimization problem was solved for two types of generators:cantilever and stack.For the cantilever generator,the task was to optimize the design in such a way as to obtain the maximum output power for a given mechanical excitation.The optimization process was divided into several stages,which significantly reduced the amount of calculations.The task of optimizing the stack type for a given form of mechanical loading consisted in finding the geometric parameters of the generator at which the output voltage and power would be maximum.In the result of solving both problems,sets of geometric design parameters of PEGs were obtained,on the basis of which efficient transducers can be developed for specific operating conditions.It turned out that this technique is more suitable for optimizing the design of cantilever generators than for stack ones in given constraints.The solution of both problems was realized using the finite element method.
基金The study was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation State task in the field of scientific activity,scientific project No.(0852-2020-0032)/(BAZ0110/20-3-07IF).The equipment of the Center of Research Institute of Physics SFedU was used.
文摘Study of the fatigue endurance and mechanical strength of solid solutions of the PZT-PZN-PMN system,modified with Ba and Sr,corresponding to the formula(Pb_(1-a_(1)-a_(2))Sr_(a_(1))Ba_(a_(1)))[Ti_(x)Zr_(y)<(Nb_(2/3)Zn_(1/3))(Nb_(2/3)Mg_(1/3))>_(1-x-y)]O_(3),with a_(1)=0.02÷0.12;Da_(1)=0.02,a_(2)=0.0036÷0.073;x=0.385÷0.430,y=0.402÷0.447 is presented.It is shown that the evolution of the polarization characteristics with an increase in the number of repolarization cycles,n,is characterized by two sections:slow fatigue and logarithmic evolution.It was found that an increase in the strontium content shifts the beginning of the logarithmic stage towards to the large n.It is shown that an increase in the average grain size decreases the mechanical strength.A conclusion is made about the expediency of using the obtained data in the development of devices operating in power modes.
