随着国家对新型节能科技的重点扶持以及安全经营的高度重视,商业厨房中明火烹调的方式逐渐被节能环保、安全系数高的电磁加热所取代。针对Middleby公司的商用电磁保温桶项目,设计实现了温度可调、加热保温自动化、超温及干锅自动断电保...随着国家对新型节能科技的重点扶持以及安全经营的高度重视,商业厨房中明火烹调的方式逐渐被节能环保、安全系数高的电磁加热所取代。针对Middleby公司的商用电磁保温桶项目,设计实现了温度可调、加热保温自动化、超温及干锅自动断电保护的智能化加热产品。在商用电磁保温桶的开发设计过程中,作为后级电路的驱动电路,自激振荡电路是整个系统中必不可少的的环节。为了设计保温电磁设备工作电路中使用的15 k Hz稳定脉冲的多谐自激振荡电路,分析了传统自激振荡电路的原理与不足。通过增加反馈电路与延时电路,设计了性能稳定的对称多谐自激振荡电路。通过软件仿真及实际电路测试,将理论值与实际值进行比较分析。试验结果表明,所设计的对称多谐自激振荡电路可以提高系统稳定性,杜绝程序跑飞的可能性,且电路结构简单、成本低,适用于低功率应用场合。展开更多
Harmonic, subharmonic, superharmonic, simultaneous sub/super harmonic, and combination resonances of the additive type of self-excited two coupled-second order systems to multi-frequency excitation are investigated. T...Harmonic, subharmonic, superharmonic, simultaneous sub/super harmonic, and combination resonances of the additive type of self-excited two coupled-second order systems to multi-frequency excitation are investigated. The theoretical results are obtained by the multiple-scales method. The steady state amplitudes for each resonance are plotted, showing the influence of the different parameters. Analysis for each figure is given. Approximate solution corresponding to each type of resonance is determined. Stability analyses are carried out for each case.展开更多
The present paper proposes a control method to excite spinning solar sail membranes for three-dimensional use.Using optical property switching,the input is given as the change in magnitude of the solar radiation press...The present paper proposes a control method to excite spinning solar sail membranes for three-dimensional use.Using optical property switching,the input is given as the change in magnitude of the solar radiation pressure.The resonance point of this system varies with the vibration state due to its nonlinearity and the change in equilibrium state.To deal with this,a state feedback control law that automatically tracks the resonance point is developed in the present study.The proposed method enables decentralized control of the actuators on the sail,each of which determines the control input independently using only the information of vibration state.The proposed method is validated using numerical simulations.The results show that the nonlinear system behaves differently from the linear system,and the vibration grows using the decentralized control regardless of resonance point variation.展开更多
文摘随着国家对新型节能科技的重点扶持以及安全经营的高度重视,商业厨房中明火烹调的方式逐渐被节能环保、安全系数高的电磁加热所取代。针对Middleby公司的商用电磁保温桶项目,设计实现了温度可调、加热保温自动化、超温及干锅自动断电保护的智能化加热产品。在商用电磁保温桶的开发设计过程中,作为后级电路的驱动电路,自激振荡电路是整个系统中必不可少的的环节。为了设计保温电磁设备工作电路中使用的15 k Hz稳定脉冲的多谐自激振荡电路,分析了传统自激振荡电路的原理与不足。通过增加反馈电路与延时电路,设计了性能稳定的对称多谐自激振荡电路。通过软件仿真及实际电路测试,将理论值与实际值进行比较分析。试验结果表明,所设计的对称多谐自激振荡电路可以提高系统稳定性,杜绝程序跑飞的可能性,且电路结构简单、成本低,适用于低功率应用场合。
文摘Harmonic, subharmonic, superharmonic, simultaneous sub/super harmonic, and combination resonances of the additive type of self-excited two coupled-second order systems to multi-frequency excitation are investigated. The theoretical results are obtained by the multiple-scales method. The steady state amplitudes for each resonance are plotted, showing the influence of the different parameters. Analysis for each figure is given. Approximate solution corresponding to each type of resonance is determined. Stability analyses are carried out for each case.
基金The present study was supported by JSPS KAKENHI Grant Number JP18J11615.
文摘The present paper proposes a control method to excite spinning solar sail membranes for three-dimensional use.Using optical property switching,the input is given as the change in magnitude of the solar radiation pressure.The resonance point of this system varies with the vibration state due to its nonlinearity and the change in equilibrium state.To deal with this,a state feedback control law that automatically tracks the resonance point is developed in the present study.The proposed method enables decentralized control of the actuators on the sail,each of which determines the control input independently using only the information of vibration state.The proposed method is validated using numerical simulations.The results show that the nonlinear system behaves differently from the linear system,and the vibration grows using the decentralized control regardless of resonance point variation.
