The Experts below are selected from a list of 13452 Experts worldwide ranked by ideXlab platform

B.p. Rasmussen - One of the best experts on this subject based on the ideXlab platform.

  • on reducing evaporator superheat nonlinearity with control architecture
    International Journal of Refrigeration-revue Internationale Du Froid, 2010
    Co-Authors: M S Elliott, B.p. Rasmussen
    Abstract:

    Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is dramatically improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks Catastrophic Damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation.

  • A control architecture solution to superheat nonlinearity
    American Control Conference (ACC) 2010, 2010
    Co-Authors: M S Elliott, B. Shenoy, B.p. Rasmussen
    Abstract:

    Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks Catastrophic Damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to-superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Modeling and experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation.

M S Elliott - One of the best experts on this subject based on the ideXlab platform.

  • on reducing evaporator superheat nonlinearity with control architecture
    International Journal of Refrigeration-revue Internationale Du Froid, 2010
    Co-Authors: M S Elliott, B.p. Rasmussen
    Abstract:

    Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is dramatically improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks Catastrophic Damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation.

  • A control architecture solution to superheat nonlinearity
    American Control Conference (ACC) 2010, 2010
    Co-Authors: M S Elliott, B. Shenoy, B.p. Rasmussen
    Abstract:

    Evaporator superheat control is an important aspect of the operation of refrigeration and air conditioning systems; since the majority of cooling in these systems occurs through evaporation of two-phase refrigerant, the energy efficiency is improved by reducing the amount of superheat present. However, allowing refrigerant to leave the evaporator without completely vaporizing risks Catastrophic Damage to the compressor, so superior control is required at low superheat levels. One of the most significant challenges present in this control problem is the presence of significant nonlinearities in the response from the control input, e.g. expansion valve position, to evaporator superheat. This paper reveals how a particular control architecture inherently compensates for both the static and dynamic nonlinearities that dominate the valve-to-superheat transient response. Furthermore, the control implementation only requires temperature measurements, which are frequently available in ordinary HVAC systems. Modeling and experimental results confirm the reduction of nonlinearities using the proposed approach, and the authors discuss the effect of actuator limitations on the nonlinearity compensation.

Joseph Wang - One of the best experts on this subject based on the ideXlab platform.

  • Swimmers Heal on the Move Following Catastrophic Damage.
    Nano letters, 2021
    Co-Authors: Emil Karshalev, Cristian Silva-lopez, Kyle T. Chan, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and “on-the-fly” structural recovery in large containers. Incorporation of magnetic Nd2F...

  • swimmers heal on the move following Catastrophic Damage
    Nano Letters, 2021
    Co-Authors: Emil Karshalev, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Cristian Silvalopez, Kyle Chan, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and "on-the-fly" structural recovery in large containers. Incorporation of magnetic Nd2Fe14B microparticles in specialized printed strips results in rapid reorientation and reattachment of the moving tail to its complementary broken static piece to restore the original swimmer structure and propulsion behavior. The swimmers display functional recovery independent of user input. Measurements of the magnetic hysteresis and fields were used to assess the behavior of the healing mechanism in real swimming situations. Damage position and multiple magnetic strip patterns have been examined and their influence upon the recovery efficiency has been compared. Owing to its versatility, fast response, and simplicity the new self-healing strategy represents an important step toward the development of new "on-the-fly" repairing strategies for small-scale swimmers and robots.

Emil Karshalev - One of the best experts on this subject based on the ideXlab platform.

  • Swimmers Heal on the Move Following Catastrophic Damage.
    Nano letters, 2021
    Co-Authors: Emil Karshalev, Cristian Silva-lopez, Kyle T. Chan, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and “on-the-fly” structural recovery in large containers. Incorporation of magnetic Nd2F...

  • swimmers heal on the move following Catastrophic Damage
    Nano Letters, 2021
    Co-Authors: Emil Karshalev, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Cristian Silvalopez, Kyle Chan, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and "on-the-fly" structural recovery in large containers. Incorporation of magnetic Nd2Fe14B microparticles in specialized printed strips results in rapid reorientation and reattachment of the moving tail to its complementary broken static piece to restore the original swimmer structure and propulsion behavior. The swimmers display functional recovery independent of user input. Measurements of the magnetic hysteresis and fields were used to assess the behavior of the healing mechanism in real swimming situations. Damage position and multiple magnetic strip patterns have been examined and their influence upon the recovery efficiency has been compared. Owing to its versatility, fast response, and simplicity the new self-healing strategy represents an important step toward the development of new "on-the-fly" repairing strategies for small-scale swimmers and robots.

Jieming Yan - One of the best experts on this subject based on the ideXlab platform.

  • Swimmers Heal on the Move Following Catastrophic Damage.
    Nano letters, 2021
    Co-Authors: Emil Karshalev, Cristian Silva-lopez, Kyle T. Chan, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and “on-the-fly” structural recovery in large containers. Incorporation of magnetic Nd2F...

  • swimmers heal on the move following Catastrophic Damage
    Nano Letters, 2021
    Co-Authors: Emil Karshalev, Jieming Yan, Elodie Sandraz, Mathieu Gallot, Amir Nourhani, Javier E. Garay, Cristian Silvalopez, Kyle Chan, Joseph Wang
    Abstract:

    Herein, we describe the development of 2D self-healing small-scale swimmers capable of autonomous propulsion and "on-the-fly" structural recovery in large containers. Incorporation of magnetic Nd2Fe14B microparticles in specialized printed strips results in rapid reorientation and reattachment of the moving tail to its complementary broken static piece to restore the original swimmer structure and propulsion behavior. The swimmers display functional recovery independent of user input. Measurements of the magnetic hysteresis and fields were used to assess the behavior of the healing mechanism in real swimming situations. Damage position and multiple magnetic strip patterns have been examined and their influence upon the recovery efficiency has been compared. Owing to its versatility, fast response, and simplicity the new self-healing strategy represents an important step toward the development of new "on-the-fly" repairing strategies for small-scale swimmers and robots.