Zhigang Yang

Jilin University, Yung-chi, Jilin Sheng, China

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Publications (21)4.8 Total impact

  • Miaolei ZHOU, Wei GAO, Zhigang YANG, Yantao TIAN
    Journal of Advanced Mechanical Design Systems and Manufacturing 01/2012; 6(7):1154-1167. · 0.49 Impact Factor
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    ABSTRACT: The factors which influence the pressure of fluid in the Electro-rheological (ER) valve are analyzed; The kinematic equations of ER Fluid under the electric field are established; The prototype of multi-channel cylindraceous ER valve is manufactured based on the technical requirement of ER valve; The flow characteristics of the fluid in the valve are analyzed by the software of Fluent; The test bench of ER valve is built and the influences of the actuator’s driving ability according to the flow acreage of ER valve are analyzed; The static pressure endurable ability of ER valve and the instantaneous hydraulic pressure endurable ability under the circumstance of high speed flow are studied; The characteristics of hydraulic pressure endurable ability of parallel ER valve are obtained.
    Intelligent Computation Technology and Automation, International Conference on. 01/2010; 3:800-806.
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    ABSTRACT: This paper presents a piezoelectric stack pump for precise actuator. The piezoelectric pump is characterized by long travel range, precise flow, large driving force, etc. The actuator is controlled by PC and Data Acquisition and Control System (DACS). Simulations and experiments showed that the piezoelectric pump has high efficiency and good performance. With a voltage of 100 V, the flow rate is linear when the rectangle pulses count, so the displacement can be controlled. And its power consumption is low. It studied the effect relationship between frequency and driving velocity under no-load state of the actuator. A multi-chamber pump with buffer chamber structure prevents the valve failure under extreme high pressure. The ultra-precision actuator developed can achieve step resolution 0.038 ¿m. The maximum driving force is 42 N. The maximum driving velocity is 14.8 mm/s and at the best velocity driving frequency is 120 Hz.
    01/2010;
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    ABSTRACT: This paper presents a built-in self test pump actuated by piezoelectric bimorphs for fluidic systems. The sensor fabricated by MEMS ensures the flow to be 0.5μ l/s. There are two piezoelectric vibrators in the pump and the check valve is metal cantilever beam. The pump is characterized by integrated structure, flow with built-in self test, wide frequency response, etc. The size of the piezoelectric pump with built-in self test is 30mm, 30mm and 16mm, which is fabricated by precise manufacturing. The high-speed micro processor is used to run the algorithmic program and control the pump with self test. Experiments show that the fuzzy control is fitted for the flow control system. With the appropriate fuzzy rules, the new type of piezoelectric pump can achieve the precision of 0.5μ l/s.
    01/2010;
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    ABSTRACT: This paper presents a piezoelectric stack pump for precise actuator. The piezoelectric pump is characterized by long travel range, precise flow, large driving force, etc. Simulations and experiments showed that the piezoelectric pump has high efficiency and good performance. With a voltage of 100V, the flow rate is linear when the rectangle pulses count, so the displacement can be controlled. And its power consumption is low. It studied the effect relationship between frequency and driving velocity under no-load state of the actuator. A multi-chamber pump with buffer chamber structure prevents the valve failure under extreme high pressure. The ultra-precision actuator developed can achieve step resolution 0.038μm. The maximum driving force is 42N. The maximum driving velocity is 14.8mm/s and at the best velocity driving frequency is 120Hz.
    01/2010;
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    ABSTRACT: This paper presents a novel and disposable piezoelectric micropump with high performance for a new closed-loop insulin therapy system. The micropump was designed using four chambers in a serial connection structure, and was manufactured using the materials with good bio-compatibility. The major advantages of the proposed micropump include: possessing high performance under lower working voltage, low-cost, high resolution of flow rate. A maximum backpressure of 22kPa was recorded at an applied voltage of 36Vpp and a driving frequency of 200Hz, the maximum resolution of outflow can obtain 6.23×10−5mL per pulse. Through in vivo animal tests, the new closed-loop insulin therapy system has shown a qualification on controlling blood glucose. The proposed micropump also demonstrated necessary characteristics in terms of stability, accuracy and bio-compatibility, for use in precision insulin delivery.
    Sensors and Actuators A-physical - SENSOR ACTUATOR A-PHYS. 01/2010; 163(1):291-296.
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    ABSTRACT: The application and working principle of piezoelectric insulin pump are analyzed. The design of using piezoelectric elements to drive the push type insulin pump was proposed. A two serial chamber piezoelectric pump is selected as drive resource and the injector pushed by piezoelectric pump is used to achieve transporting the liquid medicine accurately. The experimental device are designed and researched. The designed piezoelectric insulin pump can transport the liquid medicine and has the self-lock ability meanwhile. Even when the output back pressure is high, the back flow of liquid will not happen. The test results showed: with 180 Hz driving signal, the flow of pump can reach 37.5 ¿L.
    01/2009;
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    ABSTRACT: This paper presents a built-in self test pump actuated by piezoelectric bimorphs for fluidic systems. The sensor fabricated by MEMS ensures the flow to be 0.1 mul/s. The pump is characterized by thin structure, precise rate of flow, low power consumption, etc. A prototype of the pump, with a size of 20 mm, 20 mm and 7 mm, is fabricated by precise manufacturing. Simulations and experiments show that the piezoelectric pump has high efficiency and good performance. With a voltage of 75 V, the flow rate is 0.5 mul every three electronic pulses and its power consumption is only 2.6 mW. A robust passive high pressure check valve is developed for piezoelectric actuated pumps. A novel metal check valve flap is used to increase the valve's structural stiffness with pressures up to 20.4 kPa. A series-wound multi-pump chamber structure prevents valve-flap from failure under extreme high pressure.
    01/2009;
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    ABSTRACT: A single vibrator gas piezoelectric micro-pump has been presented in this work. The structure is designed and the dynamic modeling and simulation of the check valve which is the main component of pump are investigated. Based the analysis results, a proto type of gas micro-pump is fabricated and measured. The pump is driven by piezoelectric bimorph which has a hole in the middle, and a check valve is adhered to the hole to cut off fluid. The inlet and outlet is located in the two sides of the piezoelectric vibrator, and the on/off action of the check valve corresponding to the variation of the pump chamber is produced by the actuation vibration energy of piezoelectric vibrator. Compare with the traditional piezoelectric pump which inlet and outlet is located in one side and the check valve of it is driven by differential pressure on the two sides, it has lower fluid resistance and preferable unidirectional cut off characteristic. So the gas pumping ability and the response frequency of check valve are enhanced. The measured output flow rate of present design by experiment reaches 840 ml/min when driving voltage and frequency is 50 V and 1000 Hz.
    01/2009;
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    ABSTRACT: A new precision rotary piezoelectric (PZT) actuator is proposed to improve its drive performance. Based on piezoelectric technology, the actuator adopts the principle of bionics, with a new method of stator inner anchor/loosen/rotor outer drive and a distortion structure of a thin shelf flexible hinge. This structure improves the stability of the anchor/loosen and step rotary. Its characteristics are evaluated by finite element analysis. The experiment shows that the new rotary PZT actuator works with higher frequency (40 Hz), higher speed (325 μrad/s), wider movement (360°), high resolution (1 μrad/step) and high torque (30 N·cm). The novel actuator can be applied in wide movement and high resolution driving devices such as those for optics engineering, precision positioning and some other micro-manipulation fields.
    Frontiers of Electrical and Electronic Engineering in China 08/2008; 3(3):364-369.
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    ABSTRACT: Energy generation performance of a piezoelectric generator depends mainly on several elements such as the structural style, boundary conditions, geometry parameters, materials, vibration-source frequency, and external load. To obtain the optimal energy-harvesting device, the Raleigh method is used to establish the analysis model of circular piezoelectric composite diaphragms. Simply supported and clamped boundary conditions were considered. The relationships between the output power and the structural parameters of piezoelectric composite diaphragms, and the external load resistance and frequency were shown. Given the correlative material parameters and boundary conditions, the output power, using structural parameters, external load, or vibrating frequency as variables, can be calculated. Simulation results show that there are optimal structural parameters and load for a composite diaphragm to achieve the maximum output power. A piezoelectric diaphragm generator with given dimensions tends to achieve higher output power under clamped boundary conditions than that under simply supported boundary conditions.
    Frontiers of Mechanical Engineering in China 01/2008; 3(4):434-440.
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    ABSTRACT: A novel piezoelectric (PZT) precision step rotary actuator was developed on the basis of PZT technology. It adopts the principle of bionics and works with an inside anchoring/loosening of the stator and a distortion structure of the uniformly distributed thin flexible hinge to solve problems such as ineffective anchoring/loosening, low step rotary frequency, small travel, poor resolution, low speed and unsteady output. The developed actuator is characterized by high frequency (30 Hz), high speed (380 μrad/s), large travel (>270°), high resolution (1 μrad/step), and work stability. It greatly improves the ability to drive the existing PZT step rotary actuator. The new actuator can be applied in the field of micromanipulation and precision engineering, including precision driving and positioning and optics engineering.
    Frontiers of Mechanical Engineering in China 06/2007; 2(3):356-360.
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    ABSTRACT: As an evangel to diabetics, the invention of insulin pump has drastically renovated the ways of treatment for diabetes. Having been developing since 1970s, insulin pump is an advanced product now. However, the insulin pump in the market is still far from being satisfactory, as pains were caused to patients out of the injection and finger blood extraction. Even worse, if insulin is over injected, the patient can have low blood sugar level that could be life threatening to the patient. And the treatment is expensive to the patients and it is estimated to be 10 RMB/hour due to the high cost of the current insulin systems. It is desirable for regular patients to be provided with a closed-loop, low cost glucose-insulin pump diabetes treatment system, which is not yet available in the market. This closed-loop system will make the glucose measurement and insulin pumping be conducted continuously so that a complete diabetic management can be realized. A novel intelligent insulin pump with painless and automatic injection coupled with the glucose metering was introduced in the present study
    01/2006;
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    ABSTRACT: Many of the compounds in drugs cannot be effectively delivered using current drug delivery techniques (e.g., pills and injections). Transdermal delivery is an attractive alternative, but it is limited by the extremely low permeability of the skin. As the primary barrier to transport is located in the upper tissue, Micro-Electro-Mechanical-System (MEMS) technology provides novel means, such as microneedle array and PZT pump, in order to increase permeability of human skin with efficiency, safety and painless delivery, and to decrease the size of the pump. Microneedle array has many advantages, including minimal trauma at penetration site because of the small size of the needle, free from condition limitations, painless drug delivery, and precise control of penetration depth. These will promote the development of biomedical sciences and technology and make medical devices more humanized. So far, most of the insulin pumps being used are mechanical pumps. We present the first development of this novel technology, which can assemble the PZT pump and the microneedle array together for diabetes mellitus. The microneedle array based on a flexible substrate can be mounted on non-planar surface or even on flexible objects such as a human fingers and arms. The PZT pump can pump the much more precision drug accurately than mechanical pump and the overall size is much smaller than those mechanical pumps. The hollow wall straight microneedle array is fabricated on a flexible silicon substrate by inductively coupled plasma (ICP) and anisotropic wet etching techniques. The fabricated hollow microneedles are 200μm in length and 30μm in diameter. The microneedle array, which is built with on-board fluid pumps, has potential applications in the chemical and biomedical fields for localized chemical analysis, programmable drug-delivery systems, and very small, precise fluids sampling. The microneedle array has been installed in an insulin pump for demonstration and a leak free packaging is introduced.
    Microfluidics and Nanofluidics 01/2006; 2(5):417-423. · 3.22 Impact Factor
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    ABSTRACT: With a microsystem or micropump, the release rate of drug delivery is able to be controlled easily to maintain the therapeutic efficacy. A piezoelectric membrane-valve micropump for implantable and carryhome drug delivery system is developed and tested. The influence elements of dynamic performance of the PZT actuator and valve were analyzed, and the calculation method of resonant frequency of the membrane valve was provided. Study results showed that the output performance of the micropump depended on the coupling effect of the actuator and valve. For a given actuator, the output value and the optimal frequency of a micropump could be enhanced only by valve design. Two micropumps with different valve dimensions were fabricated for comparing examination. The smaller -valve micropump obtained higher output values (the maximum flow rate and backpressure being 3.5 ml/min and 27 KPa, respectively) and two optimal frequencies (800 Hz and 3 000 Hz). The larger -valve micropump achieved lower output values (the maximum flow rate and backpressure being 3.0 ml/min and 9 KPa, respectively) and one optimal frequency (about 200 Hz). The test results suggest that the output values and optimal frequency of micropump can be improved by changing the valve dimension, and the viewpoint that checkvalve micropump works only with low acting frequency is wrong.
    Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi 09/2005; 22(4):809-13.
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    ABSTRACT: An impact drive rotary precision actuator with end-loaded piezoelectric cantilever bimorphs is proposed. According to finite element analysis and experiments of the dynamic characteristics of end-loaded piezoelectric cantilever bimorphs, a specific fixed-frequency and adjustable-amplitude is confirmed to control the actuator. The results show that an actuator excited by fixed-frequency and the adjustable-amplitude ramp voltage waveform works with a large travel range (180°), high resolution (1 μrad), speed (0.2 rad/min) and heavy-load ability (0.02 Nm). With advantages of high-precision positioning ability, simple structure and only one percent the cost of traditional impact drive mechanisms, the actuator is expected to be widely used in precision industries.
    Frontiers of Mechanical Engineering in China 01/2005; 3(1):71-75.
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    ABSTRACT: A new type of two-stage direct drive piezoelectric servo valve is designed and its control system is presented in this paper. The multilayer piezoelectric actuator is used as the electricity-machine converter in this new servo valve, which gives the electrohydraulic servo system higher precision and an extensive application field. The bidirectional piecewise gearshift integral PID control method proposed in this paper can solve the nonlinear problem of the servo valve and satisfy the demand of the control system. Experiment results have confirmed the effectiveness of the proposed method
    Robotics and Biomimetics, 2004. ROBIO 2004. IEEE International Conference on; 09/2004
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    ABSTRACT: A novel double-chamber series piezoelectric pump has been presented and tested. The pump is a multi-layer circular planar structure, consisting of PMMA (polymethyl methacrylate) pump body, two PZT actuator membranes and three cantilever valves. The PZT actuators are driven at a phase difference of 180 degrees, which is equal to two one-chamber pumps running in series. The output performance depends on the geometrical parameters of the actuator membrane. The prototype pump, fabricated with the PZT membrane 0.18 mm in thickness and 50 mm in diameter of 50 mm, can deliver drug in either direct way (pumping liquid drug) or indirect way (pumping air to extrude liquid drug from a sealed container). The frequency-response characteristic of the two handling methods is of difference. The pump obtains optimum performance at low frequency for liquid as medium, and at high frequency for air as medium. For both the direct delivery and indirect delivery, the maximum flowrate achieved reached up to 220 ml/min and 35 ml/min, respectively; and the maximum backpressure obtained amounted to about 14 KPa and 21 KPa, respectively, at the applied voltage of 80 V with frequency of 20 Hz.
    Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi 05/2004; 21(2):297-301.
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    ABSTRACT: In this paper, brings forward a new kind of piezoelectric motor device, which can perform 6 directions linear movement in a smooth plate. The motor device is driven by a single frequency electric signal, and the moving direction of the motor device can be controlled by just changing the input electrical signal. The paper first describes the principle of driving the motor. It then describes how to design the motor device that can provide the power. Finally, based on the experiments, it proves that this kind of motor device could accomplish the desired movements
    System Theory, 2001. Proceedings of the 33rd Southeastern Symposium on; 04/2001
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    ABSTRACT: Piezoelectric pumps have the potential to be used in a variety of applications, such as in air circulation and compression. However, piezoelectric membrane pumps do not have enough driving capacity, and the heat induced during the direct contact between the driving part and the gas medium cannot be dissipated smoothly. When the gas is blocked, the piezoelectric vibrator generates heat quickly, which may eventually lead to damage. Resonantly driven piezoelectric stack pumps have high performance but no price advantage. In this situation, a novel, resonantly driven piezoelectric gas pump with annular bimorph as the driver is presented. In the study, the working principle of the novel pump was analyzed, the vibration mechanics model was determined, and the displacement amplified theory was studied. The outcome indicates that the displacement amplification factor is related with the original displacement provided by the piezoelectric bimorph. In addition, the displacement amplification effect is related to the stiffness of the spring lamination, adjustment spring, and piezoelectric vibrator, as well as to the systematic damping factor and the driving frequency. The experimental prototypes of the proposed pump were designed, and the displacement amplification effect and gas output performance were measured. At 70 V of sinusoidal AC driving voltage, the improved pump amplified the piezoelectric vibrator displacement by 4.2 times, the maximum gas output flow rate reached 1685 ml/min, and the temperature of the bimorph remained normal after 2000 hours of operation when the gas medium was blocked.
    Journal of Mechanical Science and Technology 27(3). · 1.09 Impact Factor