Moment Resisting Performance Analysis and Structure Optimization for Electric Actuator

2012 ◽  
Vol 522 ◽  
pp. 686-690
Author(s):  
Gui Cheng Wu ◽  
Yu Hui Liu ◽  
Deng Liang Yang ◽  
Jian Hui Deng
Keyword(s):  
Attitude Control ◽  
Pitch Angle ◽  
Structure Optimization ◽  
Bending Moment ◽  
Torsional Moment ◽  
Electric Actuator ◽  
Moment Resisting ◽  
Actuator System ◽  
Executive Mechanism ◽  
Large Moment

The development of altitude and remote control for aircraft requires larger rudder piece pitch angle, and Electric actuator needs to withstand larger bending moment as the attitude control executive mechanism. Traditional bending moment and torsional moment of Electric actuator rely on output shaft bearing which are difficult to meet the requirement of resisting large moment. Based on a particular type of Electric actuator system, this paper analyzes its moment resisting capacity, proposes an idea of seperating bearing objects of bending and torsional moment for aircraft, and designs an innovative actuator structure. Moment test experiments show that moment resisting capacity of the new Electric actuator is enhanced to 150% more than orginal one.

The Influence of Loads Superposition, Deterioration Due to Cracks and Residual Stresses on the Strength of Tubular Junction

2017 ◽  
Vol 68 (6) ◽  
pp. 1267-1273
Author(s):  
Valeriu V. Jinescu ◽  
Angela Chelu ◽  
Gheorghe Zecheru ◽  
Alexandru Pupazescu ◽  
Teodor Sima ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Residual Stresses ◽  
Bending Moment ◽  
Combined Loading ◽  
Torsional Moment ◽  
Calculation Methods ◽  
State Of Stress ◽  
Cracked Structures ◽  
Total Participation ◽  
Theoretical Results

In the paper the interaction of several loads like pressure, axial force, bending moment and torsional moment are analyzed, taking into account the deterioration due to cracks and the influence of residual stresses. A nonlinear, power law, of structure material is considered. General relationships for total participation of specific energies introduced in the structure by the loads, as well as for the critical participation have been proposed. On these bases: - a new strength calculation methods was developed; � strength of tubular cracked structures and of cracked tubular junction subjected to combined loading and strength were analyzed. Relationships for critical state have been proposed, based on dimensionless variables. These theoretical results fit with experimental date reported in literature. On the other side stress concentration coefficients were defined. Our one experiments onto a model of a pipe with two opposite nozzles have been achieved. Near one of the nozzles is a crack on the run pipe. Trough the experiments the state of stress have been obtained near the tubular junction, near the tip of the crack and far from the stress concentration points. On this basis the stress concentration coefficients were calculated.

Design on Transmission Accuracy Testing System of Actuator

2014 ◽  
Vol 912-914 ◽  
pp. 633-637
Author(s):  
Ping He ◽  
Chao Liu ◽  
Ying Li ◽  
Zhi Qiang Zhao
Keyword(s):  
Attitude Control ◽  
High Efficiency ◽  
Low Cost ◽  
Automatic Detection ◽  
Measured Parameter ◽  
Testing System ◽  
Detection Scheme ◽  
Executive Mechanism ◽  
Test Requirements ◽  
Hardware Circuit

Actuator is the main executive mechanism for the attitude control of aircraft in the aerospace industry and aviation field. With the further development of technology, higher quality of product research and detection has been required. According to the test requirements, the actuator nonlinear parameter testing system is designed to realise the automatic detection for actuator transmission mechanism on the basis of the research in nonlinear measured parameter of tranmission accuracy. Firstly, the principle and detection scheme of the system was presented. Then the overall structure of the system was designed. After that, the hardware circuit of the system which used TMS320F2812 as main control chip was designed. It mainly consisted of the function of each module and the working process of the system. Finally, the software of the image acquisition system was presented. With the experimental verification, the system realises the automatic detection for tranmission accuracy and has advantages of low cost, high efficiency and strong resistance to interference. The functions and indexes achieved the design requirements..

Comparative Study of New Airfoils for Small Horizontal Axis Wind Turbines

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Thiago Canale ◽  
Kamal A. R. Ismail ◽  
Fatima A. M. Lino ◽  
Ahmad Arabkoohsar
Keyword(s):  
Wind Turbines ◽  
Pitch Angle ◽  
High Efficiency ◽  
Twist Angle ◽  
Bending Moment ◽  
Poor Performance ◽  
Numerical Code ◽  
Power Coefficient ◽  
Intermediate Region ◽  
Marginal Improvement

Abstract The high cost and poor performance of small wind turbines make them not widely used. In an attempt to meliorate this situation, the authors propose to investigate alternative airfoils with different chord and pitch angle distributions that permit low manufacturing, installation and maintenance costs, as well as high efficiency. To achieve these goals, two airfoil sections, Gottingen and Joukowski, together with different chord and pitch angle distributions were simulated by using a validated numerical code based on the blade element momentum (BEM) method. The chord geometry includes constant, linear, and elliptic distributions while the twist angle includes constant and linear distributions. The results reveal that the linear pitch distribution reduces the thrust in the intermediate region of the blade and the bending moment at the root and reduces the power coefficient for both rotors. Rotors with elliptic chord distribution show increased forces in the intermediate region. Joukowski based blades with elliptic chord distribution show lower thrust compared with those with linear chord distribution. The linear chord distribution increases the thrust in the intermediate region and reduces it at the tip and root regions. Blades with multiple airfoils show marginal improvement. The Gottingen and Joukowski based rotors have similar annual energy production (AEP). The Joukowski based rotor with linear pitch and linear chord distribution shows better performance at low velocities and easy to manufacture which makes it a good candidate for small power wind turbines.

Calculation of Horizontal Sectional Loads and Torsional Moment

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Vladimir Shigunov ◽  
Alexander von Graefe ◽  
Ould el Moctar
Keyword(s):  
Free Surface ◽  
Shear Force ◽  
Three Dimensional ◽  
Bending Moment ◽  
Green Functions ◽  
Container Ship ◽  
Horizontal Shear ◽  
Torsional Moment ◽  
Oblique Waves ◽  
Rankine Source

Horizontal sectional loads (horizontal shear force and horizontal bending moment) and torsional moment are more difficult to predict with potential flow methods than vertical loads, especially in stern-quartering waves. Accurate computation of torsional moment is especially important for large modern container ships. The three-dimensional (3D) seakeeping code GL Rankine has been applied previously to the computation of vertical loads in head, following and oblique waves; this paper addresses horizontal loads and torsional moment in oblique waves at various forward speeds for a modern container ship. The results obtained with the Rankine source-patch method are compared with the computations using zero-speed free-surface Green functions and with model experiments.

Bayesian sensitivity analysis of flight parameters that affect main landing gear yield locations

2014 ◽  
Vol 118 (1210) ◽  
pp. 1481-1497 ◽  
Author(s):  
P. Sartor ◽  
K. Worden ◽  
R. K. Schmidt ◽  
D. A. Bond
Keyword(s):  
Sensitivity Analysis ◽  
Pitch Angle ◽  
Shock Absorber ◽  
Bending Moment ◽  
Landing Gear ◽  
Tube Bending ◽  
Vertical Descent ◽  
Margin Of Safety ◽  
Flight Parameters ◽  
The Individual

Abstract An aircraft and landing gear loads model was developed to assess the Margin of Safety (MS) in main landing gear components such as the main fitting, sliding tube and shock absorber upper diaphragm tube. Using a technique of Bayesian sensitivity analysis, a number of flight parameters were varied in the aircraft and landing gear loads model to gain an understanding of the sensitivity of the MS of the main landing gear components to the individual flight parameters in symmetric two-point landings. The significant flight parameters to the main fitting MS, sliding tube bending moment MS and shock absorber upper diaphragm tube MS include: longitudinal tyre-runway friction coefficient, aircraft vertical descent velocity, aircraft Euler pitch angle and aircraft mass. It was also shown that shock absorber servicing state and tyre pressure do not contribute significantly to the MS.

scholarly journals Semi-continous beam-to-column joints for slim-floor systems in seismic zones

2018 ◽  
Author(s):  
Adrian Ciutina ◽  
Cristian Vulcu ◽  
Rafaela Don
Keyword(s):  
Finite Element ◽  
Concrete Slab ◽  
Bending Moment ◽  
Steel Structures ◽  
Bending Test ◽  
Steel Beams ◽  
Element Analysis ◽  
Natural Fire ◽  
Floor Systems ◽  
Moment Resisting

The slim-floor building system is attractive to constructors and architects due to the integration of steel beam in the overall height of the floor, which leads to additional floor-to-floor space, used mostly in acquiring additional storeys. The concrete slab offers natural fire protection for steel beams, while the use of novel corrugated steel sheeting reduces the concrete volume, and replaces the secondary beams (for usual spans of steel structures). Currently the slim-floor solutions are applied in non-seismic regions, and there are few studies that consider continuous or semi-continuous fixing of slim-floor beams. The present study was performed with the aim to develop reliable end-plate bolted connections for slim-floor beams, capable of being applicable to buildings located in areas with seismic hazard. It is based on numerical finite element analysis, developed in two stages. In a first stage, a finite element numerical model was calibrated based on a four point bending test of a slim-floor beam. Further, a case study was analysed for the investigation of beam-to-column joints with moment resisting connections between slim-floor beams and columns. The response was investigated considering both sagging and hogging bending moment. The results are analysed in terms of moment-rotation curve characteristics and failure mechanism. 

scholarly journals Design Analysis of a Portable Manual Tyre Changer

2020 ◽  
Vol 5 (11) ◽  
pp. 1307-1318
Author(s):  
Ovundah King Wofuru-Nyenke
Keyword(s):  
Bending Moment ◽  
Steel Tube ◽  
Torsional Moment ◽  
Standard Size ◽  
Tube Size ◽  
Mechanical Advantage ◽  
Underdeveloped Countries ◽  
Wheel Rim ◽  
Cost Of Materials ◽  
The Cost

In this paper, an efficient, affordable, and portable manual automobile tyre changing tool was designed. The tool operates on the principle of second-class levers, where the load to be overcome is situated between the fulcrum and the effort point. The mechanical advantage (MA) of the bead breaker arm and pry bar assembly of the tool was determined to be 11.5. The standard tube size of the bead breaker arm that can withstand stress due to bending moment was determined to be a 2” (50mm) diameter Schedule 80 steel tube. Also, the dimensions of the standard hexagonal bolts to be used at the fulcrum and load point of the bead breaker arm are M12 × 1.5 × 75 mm, while the standard size of hexagonal nuts to be used with the bolts is M12 × 1.5 mm with a height of 10mm. Moreover, the mechanical advantage (MA) of the mount/demount arm and pry bar assembly of the tool was determined to be 5.22. Also, by comparing the angles of twist of two sizes of the mount/demount arm when the tool is used in mounting or demounting a tyre on a 16” × 7” wheel rim, the standard size of the mount/demount arm that can withstand stresses due to bending moment and torsional moment was determined to be a 60mm × 60mm × 5mm square tube. The cost of materials needed to fabricate the tyre changer summed up to ₦21,000. Ergo, the design provides an alternative portable and relatively affordable tyre changing tool that can be afforded by tyre technicians across Nigeria, and other developing or underdeveloped countries.

Cost Effective, Digital, Fail-Safe Production Tree and Wellhead Actuator System

2021 ◽  
Author(s):  
Espen Sten Johansen ◽  
Dag Ketil Fredheim ◽  
Richard Volkers ◽  
Dag Almar Hansen ◽  
Christian Petersen
Keyword(s):  
Environmental Impact ◽  
Cost Effective ◽  
Hydraulic Actuator ◽  
Closing Time ◽  
Production Chain ◽  
Electric Actuator ◽  
Safe Production ◽  
Actuator System ◽  
Effective Development ◽  
Fail Safe

Abstract E&P companies are challenged with the cost-effective development of smaller and marginal fields, while ensuring safety for its crew and facing increasing regulatory requirements for further reducing emissions and environmental impact. Key enablers to achieve profitable development of smaller fields and maintaining safe production in remote locations is digitizing and automating the production chain and limit the need for on-site personnel. There are a number of safety critical valves on wellheads and production trees that have historically been manually or hydraulically operated and thus not suited for fully remote operations. In 2017, Equinor, Baker Hughes and TECHNI formed a Joint Industry Project (JIP) to develop a new electric actuator control system. The actuator system is designed for fail-safe, critical operations offshore and is subject to stringent safety design requirements. The key driver is reducing CAPEX and OPEX and environmental impact for offshore installations, while increasing availability of wells while providing improved monitoring and condition based, predictive maintenance. The electric actuator system developed in the JIP has a patent pending fail-safe mechanism with extremely fast closing time to ensure well containment during critical situations. It is designed to be a drop-in replacement for existing hydraulic actuator solutions and is suitable for most standard wellhead and tree designs, sizes, and pressure ratings. The all-electric solution contains a multitude of sensors, that, in combination with an integrated digital interface, enables data-driven insights from the systems in operation. The actuator development is currently at Technology Readiness Level (TRL) 4 on the API 17N, 0 to 7 scale. In 2020, the JIP consortium was awarded NOK 8.2 million (USD 950 000) by the Norwegian Research Council DEMO 2000 program to support the test and qualification program. TRL 5 testing is planned in first half of 2021 yielding it ready for field installation.

Control Co-Design for Rotor Blades of Floating Offshore Wind Turbines

2020 ◽  
Author(s):  
Xianping Du ◽  
Laurent Burlion ◽  
Onur Bilgen
Keyword(s):  
Wind Turbine ◽  
Pitch Angle ◽  
Cone Angle ◽  
Bending Moment ◽  
Rotor Blades ◽  
Offshore Wind ◽  
Step Response ◽  
Offshore Wind Turbine ◽  
Blade Root ◽  
Floating Offshore Wind Turbines

Abstract This paper aims to demonstrate the application of control co-design methodology for the rotor blades of a floating offshore wind turbine. A 10 MW reference wind turbine model is utilized in the co-design framework. In this paper, the coupling effect between the system, defined by the pre-cone angle, and the controller, defined by pitch angle, is analyzed with a parametric study. The system parameters of the blade are identified by exciting the system with a step input, and by using the step response. The identified model is used to demonstrate the coupling effects of the structural parameters. The control co-design process is implemented to reduce the blade root bending moment by controlling the pitch angle as a function of the pre-cone angle. Utilizing the 10 MW reference model, the proposed control co-design method can reduce the blade root bending moment and attenuate transverse vibrations faster than the original design. Compared to a sequentially designed controller, the co-design demonstrated reduction of the blade root bending moment with similar attenuation time.

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