Reliability design methodology for confined high pressure inflatable structures

2013 ◽  
Vol 51 ◽  
pp. 1-9 ◽  
Author(s):  
E.J. Barbero ◽  
E.M. Sosa ◽  
X. Martinez ◽  
J.M. Gutierrez
Keyword(s):  
High Pressure ◽  
Design Methodology ◽  
Inflatable Structures ◽  
Reliability Design

Simulation on an electro-hydrostatic actuator controlled by a high-pressure piezoelectric pump with a displacement amplifier

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Wang ◽  
Nanyue Xu ◽  
Pengyuan Wu ◽  
Rongfei Yang
Keyword(s):  
Mathematical Model ◽  
High Pressure ◽  
Design Methodology ◽  
Characteristic Analysis ◽  
Piezoelectric Pump ◽  
Component Level ◽  
Content Type ◽  
Amplification Ratio ◽  
And Performance ◽  
System Characteristics

Purpose The purpose of this paper is to provide a new hydrostatic actuator controlled by a piezoelectric piston pump and to reveal its characteristics. Design/methodology/approach In this paper, a piezoelectric pump with passive poppet valves and hydraulic displacement amplifier is designed as a new control component in a hydrostatic actuator for high actuation capacity. A component-level mathematical model is established to describe the system characteristics. Simulation verification for cases under typical conditions is implemented to evaluate the delivery behavior of the pump and the carrying ability of the actuator. Findings By using the displacement amplifier and the passive distributing valves, simulation demonstrates that the pump can deliver flow rate up to 3 L/min, and the actuator controlled by this pump can push an object weighing approximately 50 kg. In addition, it is particularly important to decide a proper amplification ratio of the amplifier in the pump for better actuation performance. Originality/value The piezoelectric pump presented in this paper has its potential to light hydrostatic actuator. The model constructed in this paper is valid for characteristic analysis and performance evaluation of this pump and actuators.

A design methodology for acoustic resonance-free, high-frequency, dimmable electronic ballast for high-pressure sodium-vapour lamps

2019 ◽  
Vol 52 (4) ◽  
pp. 524-539
Author(s):  
B Gupta Bakshi ◽  
B Roy
Keyword(s):  
High Pressure ◽  
High Frequency ◽  
Design Methodology ◽  
Power Level ◽  
Harmonic Distortion ◽  
Acoustic Resonance ◽  
Electrical Characteristics ◽  
Electronic Ballast ◽  
Lamp Current ◽  
Sodium Vapour

This paper presents a methodology to design acoustic resonance-free, high-frequency, dimmable electronic ballasts for high-pressure sodium vapour (HPSV) lamps having a range of rated wattage (70–400 W). After estimation of the ‘quiet window’ of an HPSV lamp, the proposed iterative algorithm is able to determine the acoustic resonance-free driving frequencies of a design ballast corresponding to 50%–100% power level. On the other hand, a developed wattage and voltage independent HPSV lamp model facilitates finding the required electrical characteristics of HPSV lamps without performing laboratory experimentation. Using the estimated driving frequencies of a design ballast and the synthesized electrical characteristics of the lamp, the design circuit parameters of an electronic ballast are determined. Performance evaluation of the designed ballasts, carried out on the Matlab–Simulink platform, indicates several important attributes, viz. higher power control accuracy (deviation ≤3.69%), near-unity lamp power factor (≥0.98), lower lamp current crest factor (<1.7) and lower lamp current total harmonic distortion (≤12.63%). Results establish the effectiveness of the proposed design methodology to design lightweight and compact electronic ballasts for HPSV lamps with less effort than conventional design practice.

A Robust Design Methodology for High-Pressure Compressor Throughflow Optimization

2003 ◽  
Author(s):  
N. Lecerf ◽  
D. Jeannel ◽  
A. Laude
Keyword(s):  
High Pressure ◽  
Standard Deviation ◽  
Robust Design ◽  
Design Methodology ◽  
Engine Performance ◽  
Design Parameters ◽  
Deterministic Optimization ◽  
High Pressure Compressor ◽  
Noise Factors ◽  
Pressure Compressor

Reducing costs and development times are two of the main challenges for aircraft engines manufacturers. Analysis shows that the main troubles encountered during the industrialization phase are due to choices made during the first steps, such as the preliminary design of the compressor throughflow (flowpath and velocity triangles). Therefore, constraints and needs from the later phases have to be taken into account as early as possible. A deterministic optimization method for automated compressor throughflow design has been developed to achieve these objectives, improving efficiency and surge margin while modifying the design parameters. Nevertheless, variability between the theoretical geometry and the actual one may occur because of the manufacturing process or the damages encountered during the engine life cycle. Depending on their magnitude, these differences can affect the engine performance. To consider these random phenomena from the design step, the deterministic optimization is coupled with a probabilistic approach, based on a robust design methodology which aims at guarantee the engine performance despite geometrical variability. This article deals with geometrical robustness. It presents a robust design methodology and introduces a capability function used to optimize the outputs of a compressor model while minimizing their standard deviation. The model has two kinds of inputs: the design factors, which are known by both designer and manufacturer, and the noise factors, that are just known by their mean value and their standard deviation. As robust design requires a large number of calculations, it is interesting to work with an approximated physical model such as a response surface, generated through the computation of a suitable design of experiments. This method has been successfully applied to the design of a Snecma Moteurs high-pressure compressor.

Limit State Design Based on Experimental Methods for High Pressure, High Temperature Riser and Pipeline Design

2011 ◽  
Author(s):  
Roy Shilling ◽  
Chris Alexander ◽  
Ron Livesay
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Design Methodology ◽  
Limit State ◽  
Design Procedure ◽  
Thick Wall ◽  
Pipe Material ◽  
Test Program ◽  
Riser Pipe ◽  
High Pressure High Temperature

A full-scale test program was conducted for BP America, Inc. to evaluate the performance of pipe material selected for use in high pressure, high temperature (HPHT) riser applications. Full length ultrasonic (FLUT) wall mapping was then used to select samples, and burst tests were performed at pressures exceeding 40,000 psi. The tests’ results clearly demonstrated the accuracy of the capped end burst pressures predicted by API RP 1111 as demonstrated by the low standard deviation of experimental burst pressures. The test program validated the strain-based design methodology embodied in API RP 1111, especially the empirically-based design methodology presented in Appendix B of API RP 1111. This paper presents details on the completed program and how the industry can use the insights gained in completing this study to establish design pressures that more fully utilize material strengths for thick-wall riser pipe materials while maintaining conservative factors of safety. A performance and reliability-based design procedure based on FLUT wall mapping has been proposed and verified in this study; the use of this design procedure can improve true reliability by ensuring a better quality riser product.

Strength Calculation of Cubic Hinge Sleeve Based on Ansys

2013 ◽  
Vol 275-277 ◽  
pp. 808-811 ◽  
Author(s):  
Xuan Sun
Keyword(s):  
High Pressure ◽  
Theoretical Basis ◽  
Strength Calculation ◽  
Von Mises Stress ◽  
Realistic Condition ◽  
Reliability Design ◽  
Pressure Load ◽  
Actual Model ◽  
Von Mises

Actual model of cubic hinge sleeve was established in Ansys. Strength of cubic hinge sleeve was calculated under high pressure load in realistic condition, which is based on practical processing, results of values of von Mises stress were obtained. It provides a theoretical basis for optimization and reliability design of cubic hinge sleeve. Possible factors which causes fracture of cubic hinge sleeve was analyzed preliminary.

Study on Shock Resistance of MEMS Devices with Different Stoppers

2014 ◽  
Vol 609-610 ◽  
pp. 825-830 ◽  
Author(s):  
Tao Jiang ◽  
Yun Wei ◽  
Sai Yao ◽  
Jian Zhou
Keyword(s):  
Design Methodology ◽  
Design Method ◽  
Mems Devices ◽  
Dynamics Model ◽  
Reliability Design ◽  
Traditional Design ◽  
Sharp Stress ◽  
Shock Resistance ◽  
Mems Device ◽  
Shock Environment

The shock resistance of the MEMS device can be improved by simplifying its structure, but it will reduce accuracy. A commonly implemented solution that strengthens the shock resistance is the use of stopper. However, the collision between MEMS structure and stopper in shock environment may lead to the failure of the device. Hence, stopper should have a fine protection performance. In this study, the design method and principle of the MEMS device in the shock environment were analyzed. It was pointed out that the reliability design methodology of the MEMS device based on statics theory was insufficient. Next, the response of MEMS device to shock was studied and the shock dynamics model was established. Based on the model, the shock response of the traditional design and designs with different stoppers were analyzed. At last, experiments were carried out and the protection performance of different stoppers was evaluated. Results show that the use of stopper can obviously improve the shock resistance of the device. Elastic stopper can strengthen the shock resistance of the device greatly because of the excellent protection ability, while hard stopper may cause the emergence of the sharp stress wave.

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