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rectification 2

12-phase rectification 1

additional position change 1

composite tube 1

deviation correction trajectory 1

diffuser/nozzle Si/Glass 1

diffuser/nozzle micropump 1

double-winding AC - DC generator 1

earth pressure balance shield 1

electric power integration 1

energy efficiency 1

frequency 1

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posture rectification 1

self-contained electrical system 1

simultaneous AC and DC power supply 1

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A valveless piezoelectric pump with novel flow path design of function of rectification to improve energy

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0685-3

Abstract: integrated into a piezo-driven chamber, and a novel valveless piezoelectric pump with the function of rectificationEventually, experiments were designed, and results showed that NVPPFR had the function of rectification

Keywords: composite tube     valveless piezoelectric pump     rectification     energy efficiency    

Piezoelectric diffuser/nozzle micropump with double pump chambers

WANG Wei, ZHANG Ying, TIAN Li, CHEN Xiaojie, LIU Xiaowei

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 449-453 doi: 10.1007/s11465-008-0076-4

Abstract: To eliminate check valve fatigue and valve clogging, diffuser/nozzle elements are used for flow rectification

Keywords: diffuser/nozzle Si/Glass     phenomenon     rectification     diffuser/nozzle micropump     frequency    

Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0676-4

Abstract: The control system presently used in shield posture rectification is based on driver experience, whichTherefore, a decision-making approach for the deviation correction trajectory and posture rectificationThe posture rectification loads and shield behaviors results can be solved by the proposed method.The bedrock height increases the magnitudes of the required posture rectification moments when hrectification moment in the rock layer is almost 12.6 times that in the soil layer.

Keywords: position change     deviation correction trajectory     earth pressure balance shield     mechanical model     posture rectification    

AC-DC Power Integration Techniques

Ma Weiming

Strategic Study of Chinese Academy of Engineering 2002, Volume 4, Issue 12,   Pages 53-59

Abstract:

A novel AC — DC machine is invented on the basis of the proposed new idea of electric power integration, wherein the stator with one set of 3-phase AC winding and another set of 12-phase DC winding, together with a rotor having a d-axis field winding and a q-axis stabilizing winding, is combined with a 12-phase bridge rectifier, an AC exciter with an excitation system, the automatic voltage regulator as well as a cooling system to form an integral whole. Simultaneous AC and DC power supplies with high quality being available, this new generator is especially suitable for self-contained electrical systems, such as those found on aircraft and ships, where good performance and compact size are essential. Mathematical models of the machine are established and calculation and measurement methods of the model parameters are proposed, providing a theoretical basis for solving the key technical problems. Low-frequency oscillations occurring in a synchronous generator-rectifier system are examined, stability criterion of the system is obtained, and technical measures are proposed to ensure system’s stable operation. With the AC voltage regulated, the DC voltage floats within an acceptable range, which can be achieved through rational machine design. Due to complete electrical separation of the AC and DC circuits and usage of the properly designed 12-phase DC winding, the AC voltage distortion caused by DC commutation and the DC voltage pulsation are greatly reduced, which considerably improves the EMC of the system. Expressions for the peak current and impact torque following a short-circuit fault at DC side or at both AC and DC sides are derived once the strong nonlinearity of the system is ingeniously handled. The principle and methods for on-line real time fault diagnosis of the diodes in the 12-phase rectifier are proposed so that the state of each diode can be easily judged according to the input/output-voltage waveforms. Based on the achievements of above research, AC - DC generators with high performance have been developed, laying the foundation for integration of self-contained electrical systems.

Keywords: electric power integration     double-winding AC - DC generator     12-phase rectification     simultaneous AC and    

Title Author Date Type Operation

A valveless piezoelectric pump with novel flow path design of function of rectification to improve energy

Journal Article

Piezoelectric diffuser/nozzle micropump with double pump chambers

WANG Wei, ZHANG Ying, TIAN Li, CHEN Xiaojie, LIU Xiaowei

Journal Article

Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

Journal Article

AC-DC Power Integration Techniques

Ma Weiming

Journal Article