In order to provide a solution of active rectification for linear pumps in pump control system, a novel collaborative rectification structure is conceptually designed in this paper. The fundamental subsystem is the direct drive pump cell (DDPC). A DDPC consists of a cylinder and a valve, and the piston rod and the valve spool are integrated together. The DDPC could be driven by a linear oscillating motor directly. The DDPC working process is logically modeled as a state machine. Certain theorems are given and proved to illustrate the composition principles of a pump system with collaborative rectification. The kinematic flow rate of the collaborative rectification pump is studied. According to the comparison to the existing linear pumps, the novel pump has more structure compactness and control flexibility.

The silicon pixel sensor is the core component of the vertex detector in the Circular Electron Positron Collider (CEPC). The JadePix3 is one of the chips designed to study the performance and design of pixel sensors. The chip is a design of the full-function large-size chip based on CMOS technology. To test all the functions and the performance of this chip, we designed a test system based on the IPbus framework. The test system controls the parameters and monitors the status of the pixel chip and off-chip components. The IPbus block read/write speed is extended by jumbo frame feature integration to the IPbus suite for meeting the readout specifications of the JadePix3. The robustness, scalability, and portability of this system have been verified by pulse test, cosmic test and laser test in the laboratory. This paper describes the JadePix3 DAQ and control system, the integration tests, results and performance are included.

High flow rate electrohydraulic servo valve is widely applied in hydraulic servo systems. Typical high flow rate servo valve is three-stage nozzle flapper pilot structure which is complicated, unreliable, and highly costly. This study proposed a new two-stage structure high flow rate and quick response electrohydraulic spiral pilot servo valve (ESPV) using a novel hydraulic full bridge spiral pilot stage (FBSPS) as hydraulic amplifier. Its structure is simpler than traditional servo valve which could increase reliability. A design parameters optimization method for servo valve is proposed. It is using an optimization objective function which can balance dynamic performance, static performance, and pilot state efficiency for different design objectives. The particle swarm optimization (PSO) method was applied to get the best key design parameters of ESPV. A research prototype was developed based on the optimized parameters for fast response. The experimental results indicated that the frequency bandwidth (−3 dB amplitude attenuation and −90 deg phase lag) of the ESPV is up to 150 Hz at 20% of full range. This frequency response performance is competitive with existing servo valves, and the simpler structure can improve reliability and reduce cost. Thus, it may have great potential in hydraulic servo system with high reliability requirement, such as aircraft hydraulic servo control system.

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Focus on energy saving, a compound control strategy of independent metering directional valve with loadsensing technology for engineering machinery is proposed. The compound controller is designed for four quadrants work modes. The basic principle of independent metering directional valve with load-sensing technology for engineering machinery is introduced. Then the nonlinear model of the load independent control system is developed. The complete simulation model is built by AMESim and Matlab. The compound controller which combine of motion control and pressure control is studied based on simulation. The simulation results indicate that this proposed control strategy for the independent metering directional valve can be more energy-saving and reliable than the traditional loadsensing system. Index Terms -independent metering directional valve, simulation model, compound control strategy, energy saving