scholarly journals An Unconventional Inchworm Actuator Based on PZT/ERFs Control Technology

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Guojun Liu ◽  
Yanyan Zhang ◽  
Jianfang Liu ◽  
Jianqiao Li ◽  
Chunxiu Tang ◽  
...  
Keyword(s):  
High Performance ◽  
Control Unit ◽  
Control Technology ◽  
Test Results ◽  
Hydraulic Actuator ◽  
Shear Yield ◽  
Execution Unit ◽  
Development Processes ◽  
New Type ◽  
Static Shear

An unconventional inchworm actuator for precision positioning based on piezoelectric (PZT) actuation and electrorheological fluids (ERFs) control technology is presented. The actuator consists of actuation unit (PZT stack pump), fluid control unit (ERFs valve), and execution unit (hydraulic actuator). In view of smaller deformation of PZT stack, a new structure is designed for actuation unit, which integrates the advantages of two modes (namely, diaphragm type and piston type) of the volume changing of pump chamber. In order to improve the static shear yield strength of ERFs, a composite ERFs valve is designed, which adopts the series-parallel plate compound structure. The prototype of the inchworm actuator has been designed and manufactured in the lab. Systematic test results indicate that the displacement resolution of the unconventional inchworm actuator reaches 0.038 μm, and the maximum driving force and velocity are 42 N, 14.8 mm/s, respectively. The optimal working frequency for the maximum driving velocity is 120 Hz. The complete research and development processes further confirm the feasibility of developing a new type of inchworm actuator with high performance based on PZT actuation and ERFs control technology, which provides a reference for the future development of a new type of actuator.

Preparation and Properties Study of a Low-Cost Ammonia Carboxylate Concrete Superplasticizer

2019 ◽  
Vol 11 (11) ◽  
pp. 1603-1606
Author(s):  
Fankui Zeng ◽  
Junce Zhang ◽  
Xiaoning Wei ◽  
Baoping Li
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Low Cost ◽  
Reducing Agent ◽  
Test Results ◽  
Optimum Dosage ◽  
Polycarboxylate Superplasticizer ◽  
Gradual Loss ◽  
New Type

Polycarboxylate superplasticizer is the water reducing agent that has the best application prospect in concrete engineering. In this paper, a new type of polycarboxylate superplasticizer is prepared and its properties, such as dispersibility and water-reducing rate in cement particles, slump degree and slump extension in concrete and gradual loss are tested. The test results reveal that the water-reducing agent solves the problem that the traditional polycarboxylate superplasticizer is too sensitive to the change of dosage and that it has good dispersibility to cement particles. The optimum dosage is 2.3%–2.9% and the water-reducing rate is 25.6%–33.0%. The test proves that the high-performance water-reducing agent has a good water-reducing effect. The concrete fluidity of mixed with water-reducing agent is significantly improved and the compressive strength is also improved.

scholarly journals Ship Handling in Unprotected Waters: A Review of New Technologies in Escort Tugs to Improve Safety

2021 ◽  
Vol 2 (1) ◽  
pp. 46-62
Author(s):  
Santiago Iglesias-Baniela ◽  
Juan Vinagre-Ríos ◽  
José M. Pérez-Canosa
Keyword(s):  
High Performance ◽  
New Technologies ◽  
Weather Conditions ◽  
Hull Form ◽  
Best Available Technologies ◽  
Adverse Weather Conditions ◽  
Adverse Weather ◽  
New Type ◽  
Technological Challenge ◽  
And Performance

It is a well-known fact that the 1989 Exxon Valdez disaster caused the escort towing of laden tankers in many coastal areas of the world to become compulsory. In order to implement a new type of escort towing, specially designed to be employed in very adverse weather conditions, considerable changes in the hull form of escort tugs had to be made to improve their stability and performance. Since traditional winch and ropes technologies were only effective in calm waters, tugs had to be fitted with new devices. These improvements allowed the remodeled tugs to counterbalance the strong forces generated by the maneuvers in open waters. The aim of this paper is to perform a comprehensive literature review of the new high-performance automatic dynamic winches. Furthermore, a thorough analysis of the best available technologies regarding towline, essential to properly exploit the new winches, will be carried out. Through this review, the way in which the escort towing industry has faced this technological challenge is shown.

Experimental Study on Shear Behavior of Perfobond Connector with Boot Shaped Slots

2019 ◽  
Author(s):  
Zhanchong Shi ◽  
Qingtian Su ◽  
Xinyi He ◽  
Quanlu Wang ◽  
Kege Zhou ◽  
...  
Keyword(s):  
Failure Modes ◽  
Shear Stiffness ◽  
Shear Capacity ◽  
High Shear ◽  
Test Results ◽  
Precise Location ◽  
Construction Problem ◽  
Circular Holes ◽  
New Type ◽  
Push Out

<p>In order to solve the construction problem of perforating rebars’ precise location and it’s getting through the circular holes for the the conventional perfobond connector, a new type of perfobond connector with boot shaped slots was proposed. This new type perfobond connector has the advantage of convenient construction and pricise location. Three groups of push-out tests with nine specimens were carried out to study the shear capacity of the new type perfobond connector. The effect of the number and the spacing of boot shaped slots on failure modes, shear capacity, peak slip and shear stiffness were mainly studied. The test results show that the new type of perfobond connector with boot shaped slots has a high shear capacity and a good ductility, it could be widely applied on the connection between the steel and the concrete structures.</p>

Facile synthesis of new-type MnOOH/NiAl-layered double hydroxide nanocomposite for high-performance supercapacitor

2019 ◽  
Vol 777 ◽  
pp. 749-758 ◽  
Author(s):  
Xu Hua ◽  
Chang-Jie Mao ◽  
Jing-Shuai Chen ◽  
Peng-Peng Chen ◽  
Chao-Feng Zhang
Keyword(s):  
Layered Double Hydroxide ◽  
High Performance ◽  
Facile Synthesis ◽  
New Type ◽  
Double Hydroxide

Theoretical Studies of the Physical Properties of Rodlike and Related Polymers

1988 ◽  
Vol 134 ◽  
Author(s):  
W. J. Welsh ◽  
J. E. Mark ◽  
Y. Yang ◽  
G. P. Das
Keyword(s):  
High Performance ◽  
Liquid Crystalline ◽  
Theoretical Work ◽  
Environmental Resistance ◽  
New Class ◽  
Protonated Forms ◽  
New Type ◽  
Electrooptical Properties ◽  
Cis And Trans ◽  
Strong Acids

ABSTRACTThis review focuses on a new type of para-catenated aromatic polymer being used in the preparation of high-performance films and fibers of exceptional strength, thermal stability, and environmental resistance, including inertness to essentially all common solvents. Polymers of this type include the cis- and trans-poly(p-phenylene benzobisoxazole) (PBO), the cis- and trans-forms of the corresponding poly(pphenylene benzobisthiazole) (PBT), and the structurally similar poly(5,5ʹ-bibenzoxazole-2.2ʹ-diyl-l,3-phenylene) (AAPBO) and poly(2,5-benzoxazole) (ABPBO) and their sulfurcontaining analogues. Because of their rigidity, these polymers become highly oriented in solution and some display liquid crystalline behavior. The purpose of this paper is to summarize the authorsʹ theoretical work on the structures, conformational energies, intermolecular interactions, electronic properties, electrical conductivity, and electrooptical properties of these chains, including, in some cases, the so-called articulated forms and the protonated forms known to exist in strong acids. The emphasis is on how such studies provide a molecular understanding of the unusual properties and processing characteristics of this new class of materials.

scholarly journals HIL evaluation of control unit in grid-tied coverters

2016 ◽  
Vol 20 (suppl. 2) ◽  
pp. 393-406 ◽  
Author(s):  
Vlado Porobic ◽  
Evgenije Adzic ◽  
Milan Rapaic
Keyword(s):  
Power Electronics ◽  
High Performance ◽  
Control Unit ◽  
Active Filters ◽  
Design Tool ◽  
Operating Conditions ◽  
Real Time Control ◽  
Time Control ◽  
Power Electronics Converters ◽  
Grid Connected Converters

Hardware-in-the-Loop (HIL) emulation is poised to become unsurpassed design tool for development, testing, and optimization of real-time control algorithms for grid connected power electronics converters for distributed generation, active filters and smart grid applications. It is strongly important to examine and test how grid connected converters perform under different operating conditions including grid disturbances and faults. In that sense, converter?s controller is a key component responsible for ensuring safe and high-performance operation. This paper demonstrates an example how ultra-low latency and high fidelity HIL emulator is used to easily, rapidly and exhaustively test and validate standard control strategy for grid connected power electronics converters, without need for expensive hardware prototyping and laboratory test equipment.

scholarly journals DUKUNGAN KELUARGA TERHADAP TINGKAT KESEMBUHAN PASIEN COVID-19 DI RUANG ISOLASI RUMAH SAKIT AMINAH 2021

2021 ◽  
Vol 7 (2) ◽  
pp. 164-169
Author(s):  
Agah Nugraha ◽  
Rostime Hermayerni Simanullang
Keyword(s):  
Family Support ◽  
Virus Disease ◽  
Sampling Technique ◽  
Statistical Test ◽  
P Value ◽  
Test Results ◽  
Raising Children ◽  
The Family ◽  
New Type

 Corona virus Disease 2019 (COVID-19) is an infectious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). SARS-CoV-2 is a new type of coronavirus that has never been previously identified in humans. Family support is an activity oriented to improve family functions on the basis of raising children and other family activities. in a system and resources that support. This study aims to identify family support for the healing rate of Covid-19 patients in the Isolation Room at Aminah Hospital, Tangerang in 2021. Method: observational analytic used in this research and 23 covid-19 participantn,  in this study using the Total Sampling technique. Statistical test used is the Spearman Rank statistical test. Results: The results of study obtained p value = 0.000 <0.05. Conclusion: there is a relationship between family support and the healing of  Covid-19 patients.  The role of the family is very important. and breaking chain of spread of the Covid-19.

Research on Attitude Control of Spacecraft Based on ADRC

2011 ◽  
Vol 383-390 ◽  
pp. 358-365 ◽  
Author(s):  
Fu Lin Teng ◽  
Hong Yu Ge ◽  
Hong Sheng Li ◽  
Jian Hua Zhang
Keyword(s):  
Attitude Control ◽  
Disturbance Rejection ◽  
High Performance ◽  
Control Technology ◽  
Attitude Control System ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Simulation And Experiment ◽  
Attitude Controller ◽  
Very High

Modern spacecraft demands from an attitude control system very high performance and accuracy, and many new features, such as disturbance rejection capability. The recently developed active disturbance rejection control technology is applied to the attitude control of spacecraft subject to disturbances and parametric uncertainties. Simulation and experiment show significant advantages of the proposed attitude controller over the controller resulting from conventional PID approach.

The Analysis and Design of a New Type Wedge Surfaces of Sprag Overrunning Clutch

2013 ◽  
Vol 823 ◽  
pp. 43-46 ◽  
Author(s):  
Feng Zhang ◽  
Zhi Fu Gao ◽  
Wu Hui Lu
Keyword(s):  
Carrying Capacity ◽  
High Performance ◽  
Failure Modes ◽  
Meaningful Work ◽  
Surface Design ◽  
Analysis And Design ◽  
Wedge Surface ◽  
New Type ◽  
Design And Manufacture ◽  
Working Situation

Sprag overrunning clutch is one of key components in the drive system. Its a meaningful work to design and manufacture high performance sprag clutch to meet the practical working situation. In order to design reliable and durable clutch with good dynamic characteristics, this paper put forward a new type wedge surfaces which is a combination of involute and eccentric arc. On the basis of analysis of a clutch structure, work principles and failure modes, the sprag ,key element of the clutch, was demonstrated the feasibility of involute in the use of wedge surface design by analyzing the characteristics of involute, and the main sprag parameters were designed and analysized. The design of the new wedge surface, increasing the strut angle and effective cam rise, increased carrying capacity, reducing the contact stress, and extending service life, which laid the foundation for the sprag overrunning clutch design improvements.

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