scholarly journals Theoretical and Experimental Studies of a Switched Inertance Hydraulic System in a Four-Port High-Speed Switching Valve Configuration  

2017 ◽  
Author(s):  
Min Pan ◽  
Andrew Plummer ◽  
Abdullah El Agha
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Experimental Studies ◽  
Control Flow ◽  
Analytical Models ◽  
Switching Valve ◽  
Direction Control ◽  
High Bandwidth ◽  
And Performance ◽  
High Speed Switching

The switched inertance hydraulic system (SIHS) is a novel high-bandwidth and energy-efficient digital device which can adjust or control flow and pressure by a means that does not rely on throttling the flow and dissipation of power. An SIHS can provide an efficient step-up or step-down of pressure or flow rate by using a digital control signal. In this article, analytical models of an SIHS in a four-port high-speed switching valve configuration are proposed, and the system dynamics and performance are investigated theoretically and experimentally. The flow responses, system characteristics and power consumption can be predicted effectively and accurately by using the proposed models, which were validated by comparing with experiments and with numerical simulation. The four-port configuration is compared with the three-port configuration, and it is concluded that the former one is less efficient for valves of the same size, but provides a bi-direction control capability. As bi-direction control is a common requirement, this constitutes an important contribution to the development of efficient digital hydraulics.

Adaptive Control of a Piezoelectric Valve for Fluid-Borne Noise Reduction in a Hydraulic Buck Converter

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Min Pan
Keyword(s):  
High Speed ◽  
Fast Response ◽  
High Energy ◽  
Buck Converter ◽  
Control Flow ◽  
Operating Conditions ◽  
System Structure ◽  
Analytical Models ◽  
Hydraulic Systems ◽  
Switching Valve

The hydraulic buck converter (HBC) is a novel high-bandwidth and energy-efficient device which can adjust or control flow and pressure by a means that does not rely on throttling the flow and dissipation of power. However, the nature of a HBC can cause severe fluid-borne noise (FBN), which is the unsteady pressure or flow in the fluid-filled hydraulic circuit. This is due to the operation nature of a high-speed switching valve of the device. The FBN creates fluctuating forces on the pipes which lead to system structure-borne noise that develops air-borne noise reaching to 85 dB. Thus, there is a need for an effective method that does not impair the system performance and efficiency to reduce the FBN. This paper describes the first investigation of an active controller for FBN cancellation in a HBC based on in-series and by-pass structures. The dynamics and the noise problem of the HBC are investigated using the analytical models. A piezoelectrically actuated hydraulic valve with a fast response and high force is applied as the adaptive FBN attenuator. The performance and robustness of the designed noise controller were studied with different operating conditions of a HBC. Simulated and experimental results show that excellent noise cancellation (30 dB) was achieved. The proposed active attenuator is a very promising solution for FBN attenuation in modern digital hydraulic systems which promise high energy efficiency but suffer severe noise or vibration problems in practice.

Design and Performance Analysis Based on High-Speed Switching Valve of Magnetorheological Plug-Mounted

2012 ◽  
Vol 630 ◽  
pp. 106-109 ◽  
Author(s):  
Yun Han Liu ◽  
Zhang Yong Wu ◽  
Xian Wang ◽  
Zhen Hua Duan ◽  
Xiao Yan Gao ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Intelligent Control ◽  
High Speed ◽  
Dynamic Performance ◽  
Magnetorheological Fluid ◽  
Switching Valve ◽  
Speed Of Response ◽  
And Performance ◽  
Dynamic Performance Analysis ◽  
High Speed Switching

Based on the rheological mechanism of magnetorheological fluid，we can design a kind of magnetorheological high-speed on-off valves,which used the Plug-in structure.It is shows that， through the static and dynamic performance analysis of the valves，the magnetorheological high-speed on-off valves not only has the good static, dynamic characteristics, compare to magnetorheological plug-mounted speed switch valve with traditional hydraulic, and with high speed of response, high stability, etc . It is an easy to achieve automatic control and intelligent control of the hydraulic components.

scholarly journals Design of 2.5D Interposer in High Bandwidth Memory and Through Silicon Via for High Speed Signal

2020 ◽  
Author(s):  
Bo Pu
Keyword(s):  
Artificial Intelligence ◽  
High Speed ◽  
High Performance ◽  
Equivalent Model ◽  
Electrical Characteristics ◽  
Through Silicon Via ◽  
High Bandwidth ◽  
Signal Path ◽  
High Speed Switching ◽  
Performance Computing

<p>The 2.5D interposer becomes a crucial solution to realize grand bandwidth of HBM for the increasing data requirement of high performance computing (HPC) and Artificial Intelligence (AI) applications. To overcome high speed switching bottleneck caused by the large resistive and capacitive characteristics of interposer, design methods to achieve an optimized performance in a limited routing area are proposed. Unlike the conventional single through silicon via (TSV), considering the reliability, multiple TSV are used as the robust 3D interconnects for each signal path. An equivalent model to accurately describe the electrical characteristics of the multiple TSVs, and a configuration pattern strategy of TSV to mitigate crosstalk are also proposed.</p>

scholarly journals Influence of eddy current on the dynamics of high speed switching valve.

1993 ◽  
Vol 24 (4) ◽  
pp. 504-510 ◽  
Author(s):  
Yasukazu SATO ◽  
Shojiro SATO ◽  
Hirohisa TANAKA ◽  
Yasuyuki YANAI
Keyword(s):  
Eddy Current ◽  
High Speed ◽  
Switching Valve ◽  
High Speed Switching

Trade-offs in High-Speed Serial Link ICs

2005 ◽  
Vol 15 (03) ◽  
pp. 567-579
Author(s):  
Shenggao Li
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Serial Link ◽  
Power Cost ◽  
Trade Offs ◽  
High Bandwidth ◽  
Low Jitter ◽  
Circuit Techniques ◽  
And Performance

Serial IOs are widely used to expand the system bandwidth in communication systems. This paper provides an overview of serial IO design trade-offs with regard to power, cost, and performance. Circuit techniques are discussed to achieve low jitter and high bandwidth.

Development of a High-Speed Switching Silicon Carbide Power Module

2019 ◽  
Vol 963 ◽  
pp. 864-868
Author(s):  
Shinji Sato ◽  
Fumiki Kato ◽  
Hidekazu Tanisawa ◽  
Kenichi Koui ◽  
Kinuyo Watanabe ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Current Density ◽  
High Speed ◽  
Switching Time ◽  
Power Module ◽  
Snubber Circuit ◽  
And Performance ◽  
High Speed Switching ◽  
A Current

We developed a silicon carbide (SiC) power module that can switch large currents at high speed. The withstand voltage of this power module is 1200 V, and two SiC MOSFETs are built-in and constitute a circuit for one inverter phase. This power module incorporates a snubber circuit for reducing the surge voltage generated by the SiC MOSFET for high-speed switching. In this study, switching at 270 A (a current density of 1000 A/cm 2 or more for the SiC MOSFET) was performed to evaluate this module. The turn-off switching time tf was ~10 ns, and the maximum dv/dt was 80 kV/us. Furthermore, this research examines the design and performance of the proposed power module.

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