Investigation on material combination technique to enhance the anti-wrinkle and anti-vibration characteristics of the planar membrane reflector

2021 ◽  
pp. 095440622199207
Author(s):  
Swapnil D Shinde ◽  
Satish Kumar ◽  
SH Upadhyay
Keyword(s):  
Natural Frequency ◽  
Membrane Structure ◽  
Material Combination ◽  
Combination Technique ◽  
Wrinkling Analysis ◽  
Recent Trends ◽  
Rms Error ◽  
Packaging Efficiency ◽  
Planar Membrane ◽  
The Comparative Study

In recent trends, membrane structure has increased its applications in space missions due to its significant advantages, such as light in weight, higher folding and packaging efficiency, ease of deployment, and low on-Board volume requirement. The wrinkling and low natural frequency of vibration are the major problems with the membrane structure. This research presents a novel methodology of Kapton-Kevlar material combination for a planar membrane reflector to enhance anti-vibration and anti-wrinkling capabilities of the membrane structure. The comparative study is made for the wrinkle area, RMS error, and natural frequency of vibration with the employed approach. This study provides new insights into a material combination technique to increase performance characteristics of the space-borne membrane reflectors. The outcome of the wrinkling analysis is compared and found to be consistent with the method available in the literature. From the simulation results, it is observed that wrinkles are reduced, and the natural frequency of vibration is also increased significantly with the proposed method.

VIBRATION CHARACTERISTICS SIMULATION OF WRINKLED CIRCULAR ANNULUS-SHAPED GOSSAMER SPACE STRUCTURE

2008 ◽  
Vol 05 (01) ◽  
pp. 189-198 ◽  
Author(s):  
CHANGGUO WANG ◽  
XINGWEN DU ◽  
XIAODONG HE ◽  
GUOZHI SONG
Keyword(s):  
Structural Design ◽  
Membrane Structure ◽  
Space Structure ◽  
Vibration Characteristics ◽  
Structural Vibration ◽  
Space Structures ◽  
Deformation State ◽  
Wrinkling Analysis ◽  
Wrinkled Membrane ◽  
And Control

Ultra-lightweight Gossamer space structures have received the wide attention due to their small packaging volume and low launching cost. Since wrinkles are a common deformation state and the main failure mode of such structures and vibration behaviors are the major factor of the structural design and control, a better understanding of the wrinkling characteristics and the vibration behaviors of the wrinkled membrane structure is thus very essential and desirable. In this paper, a modal analysis method incorporating the wrinkling analysis is presented to simulate the vibration characteristics of a wrinkled membrane structure. The effects of the wrinkles on the structural vibration behaviors are also summarized in detail in the end.

Simulation and Analysis of Cantilever-Membrane Structure for Piezoresistive Micro-Accelerometers

2012 ◽  
Vol 503 ◽  
pp. 87-90 ◽  
Author(s):  
Yan Liu ◽  
Yu Long Zhao ◽  
Lu Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequency ◽  
Frequency Band ◽  
Membrane Structure ◽  
Measurement Sensitivity ◽  
First Order ◽  
Working Frequency ◽  
Element Method

Dynamic and static performances are the most important parameters for accelerometers. The natural frequency decides the sensor’s working frequency band, and the accompanying stress represents the measurement sensitivity. In this paper, a novel sensing structure, cantilever-membrane structure, for piezoresistive accelerometers is studied, in order to detect the structural dimension’s effect on the sensor. With the help of FEM (Finite element method) software, the first order natural frequency of the cantilever-membrane based accelerometer is investigated with the different combinations of membrane’s dimensions. The accompanying stress of the sensing structure is also simulated in this paper. The results show that the membrane’s dimensions affect the frequency and stress more tempestuously when the membrane is short, but the tendency become gentle when the width of the membrane increases.

Evaluation of Thermal Properties of the Fe80Cr20 Nanostructure for Interconnect Application in High Temperature

2015 ◽  
Vol 815 ◽  
pp. 193-197 ◽  
Author(s):  
Abdul Mutalib Leman ◽  
Dafit Feriyanto ◽  
M.N.M. Salleh ◽  
Ishak Baba
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
High Temperature ◽  
Raw Material ◽  
Ultrasonic Technique ◽  
Material Combination ◽  
X Ray ◽  
Combination Technique ◽  
Eds Analysis ◽  
Thermal Stability Of

Metallic Fe80Cr20 alloy in thermal stability analysis is investigated. Approached method is combination technique (milled and UT) of ball milling (milled) combined with ultrasonic technique (UT) which is not yet fully explored. From Energy Dispersive x-ray Spectroscopy (EDS) analysis resulted that the composition of 80 wt% Fe and 20 wt% Cr in individual particle was achieved at milled and UB 4.5 h sample. Higher thermal stability of treated samples approximately 63% at 1100 °C temperature operation which showed by milled and UT at 4.5 h when compared to raw material. Combination technique shown high prospect to advance exploration in improving thermal stability which suitable for interconnect application.

A Method for Calculating the Dynamics of Rotating Flexible Structures, Part 2: Example Calculations

1996 ◽  
Vol 118 (3) ◽  
pp. 318-322 ◽  
Author(s):  
D. J. Segalman ◽  
C. R. Dohrmann ◽  
A. M. Slavin
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Membrane Structure ◽  
Flexible Structures ◽  
Preceding Paper ◽  
General Linear ◽  
Rotation Rates ◽  
Deformation Modes ◽  
Modal Coordinates

The problem of calculating the vibrations of rotating structures has challenged analysts since the observation that use of traditional modal coordinates in such problems leads to the prediction of instability involving infinite deformation when rotation rates exceed the first natural frequency. A method using a system of nonlinearly coupled deformation modes to analyze rotating general, linear (unjointed) structures that addresses the problem of erroneously predicting infinite deformations has been presented in a preceding paper (Segalman and Dohrmann, 1995). This technique is employed to address several types of problems ranging from simple beams to an inflated membrane structure. Some of the details of exploiting existing finite element codes to evaluate the relevant matrices are also developed.

Modal Analysis of Tensioned Membrane Structure of Umbrella-Shaped

2012 ◽  
Vol 166-169 ◽  
pp. 349-353
Author(s):  
Jian Zheng ◽  
Cheng Wei Huang ◽  
Yao Zhang
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Membrane Structure ◽  
Natural Vibration ◽  
Vibration Characteristics ◽  
Wind Loads ◽  
Design Parameters ◽  
Membrane Tension ◽  
Flexible Architecture ◽  
Natural Vibration Characteristics

The tensioned membrane structure is a typical flexible architecture and is sensitive on the wind loads . We used software ANSYS to do modal analysis of the umbrella-shaped membrane structure and analyzed the natural vibration characteristics. We focused on the effect of design parameters on structural modal. The results show that the natural frequency of umbrella-shaped membrane structure mainly depends on membrane prestress and membrane tension stiffness.

scholarly journals Australia and New Zealand Labour Markets: Some Similarities and Differences

1970 ◽  
Author(s):  
James Newell ◽  
Paul Callister
Keyword(s):  
New Zealand ◽  
Labour Market ◽  
Labour Force ◽  
Labour Markets ◽  
Common Framework ◽  
Occupational Patterns ◽  
Recent Trends ◽  
Similarities And Differences ◽  
Employment Of Women ◽  
The Comparative Study

There is much media attention given to New Zealand workers migrating to Australia. Less attention has been given to directly comparing the two labour markets. We use Australian and New Zealand census and labour force survey data to build a 2006/2008 centred comparison of labour market attributes and recent trends in both countries. Key areas considered include: how did the restructuring of the New Zealand economy in the 1980s/early 1990s affect the relative rates of prime-aged male employment in New Zealand as compared to Australia; has there been the same growth in employment of women on both sides of the Tasman: how does the liming of retirement by Australians compare with that of New Zealand residents; how similar are our overall occupational patterns; are young New Zealand born tradespeople proportionately more concentrated in the Australian workforce than in New Zealand; is the occupational structure of Auslralia resident Maori similar to that of other Australian resident; and how does the balance of extended metropolitan and other labour market catchment types compare? A 2006 Australasian comparative labour market geography developed using the Coombes algorithm as implemented by Newel/ and Papps 2001 is introduced as a common framework for the comparative study of Australia and New Zealand subnational labour markets.

Inertance Effects to Diffuser Micropumps Flow Rate Spectrum

2008 ◽  
Author(s):  
Ngoc-Bich Le ◽  
Mau-Sheng Lin ◽  
Yi-Chu Hsu ◽  
Ling-Sheng Jang
Keyword(s):  
Natural Frequency ◽  
Flow Rate ◽  
Membrane Structure ◽  
Circuit Simulation ◽  
Maximum Flow ◽  
Inertial Effects ◽  
Flow Rates ◽  
Rate Analysis ◽  
Output Flow ◽  
Operation Frequency

This study presents a diffuser micropump and characterizes its output flow rates, like the parabola shape on the frequency domain and the effecting factors. First, equivalent circuit using fluid-electric analogy was built up; then, the flow rate analysis results were compared to experiment results to verify the applicability of the circuit simulation. The operation frequency was 800 Hz for both cases and the maximum flow rates were 0.078 and 0.075 μl/s for simulation and experiment result, respectively. The maximum flow rate difference was 3.7%. The circuit then was used to analyze the inertial effects of transferred fluid as well as system components to the output flow rates. This work also explains why the flow rate spectrum has the shape of parabola. The analysis results showed that without inertial effects, the micropump flow rates are linearly proportional to the operation frequency; otherwise it has parabola shape. The natural frequency of the actuator-membrane structure was recognized using finite element method to verify if this parameter affects the characteristics of the flow rates. The experiment and simulation results demonstrated 800 Hz and 91.4 kHz for the frequency of the maximum pumping flow rate and the first mode natural frequency of actuator-membrane structure, respectively. It indicates that the structure natural frequencies of the actuator-membrane structure do not play any role to operate the micropumps.

Wrinkling Analysis of Stiffness Equivalence in Membrane Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1976-1979
Author(s):  
Ran Zhao ◽  
De Min Wei
Keyword(s):  
Field Theory ◽  
Membrane Structure ◽  
New Method ◽  
Analysis Method ◽  
Equivalent Stiffness ◽  
Membrane Structures ◽  
Wrinkling Analysis ◽  
Tension Field Theory

Based on the tension field theory, a wrinkling analysis method of equivalent stiffness was proposed. The new method was derived and the feasibility was theoretically proved. And a membrane structure was analyzed by the method. The results show that the correct load responses could be quickly attained right after appearance of wrinkled elements, which indicate that the method can be applied to wrinkling analysis of membrane structures.

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