Direct Ply Thickness Computation of Laminated Plates for Which the Kirchhoff Theory Predicts the Fundamental Frequency Within the Specified Degree of Accuracy

1993 ◽  
Vol 164 (3) ◽  
pp. 445-458 ◽  
Author(s):  
A. Bhimaraddi
Keyword(s):  
Fundamental Frequency ◽  
Laminated Plates ◽  
Kirchhoff Theory

Effects of Delaminations on Vibration Characteristic for HT3/5224 Carbon Fiber Reinforced Laminated Plate

2013 ◽  
Vol 652-654 ◽  
pp. 52-55
Author(s):  
Wei Liang ◽  
Yu Feng Liu ◽  
Nai Bin Yang
Keyword(s):  
Carbon Fiber ◽  
Fundamental Frequency ◽  
Composite Laminates ◽  
Composite Structures ◽  
Great Influence ◽  
Vibration Characteristic ◽  
Laminated Plate ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Kirchhoff Theory

Delaminating of composite is one of keys for composite structures. An energy method was used to analyze the fundamental frequency of HT3/5224 carbon fiber reinforced laminated plate in this paper. Different delaminated situations are considered in analysis on vibration of composite based on Kirchhoff theory. The results show that delaminations have a great influence on the fundamental frequency of laminated plate. The discussion shows inner delaminations have more influence on composite laminates than surface delaminations. Different kinds of delaminations can interact each other and the interaction can increase the influence on frequency.

Fiber Orientation Angles Optimization for Maximum Fundamental Frequency of Laminated Composite Plates by the Genetic Algorithm and Meshless Method

2014 ◽  
Vol 709 ◽  
pp. 130-134
Author(s):  
Feng Wang ◽  
Wei Ping Zhao ◽  
Song Xiang
Keyword(s):  
Genetic Algorithm ◽  
Fundamental Frequency ◽  
Fiber Orientation ◽  
Meshless Method ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Plates ◽  
Laminated Composite Plates ◽  
Fundamental Frequencies ◽  
Design Variables

Fiber orientation angles optimization is carried out for maximum fundamental frequency of clamped laminated composite plates using the genetic algorithm. The meshless method is utilized to calculate the fundamental frequency of clamped laminated composite plates. In the present paper, the maximum fundamental frequency is an objective function; design variables are a set of fiber orientation angles in the layers. The examples of square laminated plates are considered. The results for the optimal fiber orientation angles and the maximum fundamental frequencies of the 2-layer plates are presented.

Optimal Design of Symmetric Laminated Plates for Fundamental Frequency

1994 ◽  
Vol 171 (2) ◽  
pp. 219-229 ◽  
Author(s):  
H. Fukunaga ◽  
H. Sekine ◽  
M. Sato
Keyword(s):  
Optimal Design ◽  
Fundamental Frequency ◽  
Laminated Plates

Fundamental Frequency Optimization of Angle-Ply Laminated Plates Using Elitist-Genetic Algorithm and Finite Strip Method

2010 ◽  
Author(s):  
Mohammad Homayoun Sadr ◽  
Hadi Ghashochi Bargh
Keyword(s):  
Genetic Algorithm ◽  
Fundamental Frequency ◽  
Fitness Function ◽  
Composite Plates ◽  
Laminated Plates ◽  
Finite Strip ◽  
Strip Method ◽  
Finite Strip Method ◽  
Frequency Optimization ◽  
Elitist Strategy

In the present paper, fundamental frequency optimization of symmetrically angle-ply laminated composite plates is studied using the combination of Elitist-Genetic algorithm (EGA) and finite strip method (FSM). The design variables are the number of layers, the fiber orientation angles, edge conditions and plate length/width ratios. The classical laminated plate theory (CLPT) is used to calculate the natural frequencies of laminated rectangular plates. To improve the speed of the optimization process, the elitist strategy is used in the Genetic algorithm. In the E-GA, the fittest individuals in the generation survive and are automatically reinserted in the next generation, right before the next selection process takes place and the fitness function is computed with a semi-analytical finite strip model developed originally on the basis of full energy method. In addition, from the computational economy point of view, combination of E-GA and FSM provides a much higher convergence and reduced the CPU time. To check the validity, the obtained results are also compared with some other stacking sequences.

Optimal Design by Elitist-Genetic Algorithm for Maximum Fundamental Frequency of Fiber Metal Laminated Plates

2011 ◽  
Vol 471-472 ◽  
pp. 331-336 ◽  
Author(s):  
Hadi Ghashochi Bargh ◽  
Mohammad Homayoun Sadr-Lahidjani
Keyword(s):  
Genetic Algorithm ◽  
Fundamental Frequency ◽  
Plate Theory ◽  
Fitness Function ◽  
Laminated Plates ◽  
Finite Strip ◽  
Strip Method ◽  
Plate Length ◽  
Finite Strip Method ◽  
Fiber Metal

In this paper, fundamental frequency optimization of fiber metal laminated plates is studied using the combination of Elitist-Genetic algorithm (E-GA) and finite strip method (FSM). The design variables are the number of layers, the fiber orientation angles of inner composite layers, edge conditions and plate length/width ratios. The classical laminated plate theory (CLPT) is used to calculate the natural frequencies and the fitness function is computed with a semi-analytical finite strip method which has been developed on the basis of full energy methods. To check the validity, the obtained results are also compared with some other stacking sequences.

A Tape Striation Counting Method for Determining Fundamental Frequency

1979 ◽  
Vol 10 (4) ◽  
pp. 246-248 ◽  
Author(s):  
Peter B. Mueller ◽  
Marla Adams ◽  
Jean Baehr-Rouse ◽  
Debbie Boos
Keyword(s):  
Fundamental Frequency ◽  
Counting Method ◽  
Male And Female ◽  
Fundamental Frequencies ◽  
Counting Procedure ◽  
Female Subjects

Mean fundamental frequencies of male and female subjects obtained with FLORIDA I and a tape striation counting procedure were compared. The fundamental frequencies obtained with these two methods were similar and it appears that the tape striation counting procedure is a viable, simple, and inexpensive alternative to more costly and complicated procedures and instrumentation.

The Application of Laboratory Formulas to Clinical Voice Management

1995 ◽  
Vol 4 (2) ◽  
pp. 62-69 ◽  
Author(s):  
Katherine Verdolini ◽  
Ingo R. Titze
Keyword(s):  
Fundamental Frequency ◽  
Voice Disorders ◽  
Clinical Interventions ◽  
Case Examples ◽  
Interactive Nature ◽  
Mathematical Formulas

In this paper, we discuss the application of mathematical formulas to guide the development of clinical interventions in voice disorders. Discussion of case examples includes fundamental frequency and intensity deviations, pitch and loudness abnormalities, laryngeal hyperand hypoadduction, and phonatory effort. The paper illustrates the interactive nature of theoretical and applied work in vocology

Contributions of Voice and Nonverbal Communication to Perceived Masculinity–Femininity for Cisgender and Transgender Communicators

2020 ◽  
Vol 63 (4) ◽  
pp. 931-947
Author(s):  
Teresa L. D. Hardy ◽  
Carol A. Boliek ◽  
Daniel Aalto ◽  
Justin Lewicke ◽  
Kristopher Wells ◽  
...  
Keyword(s):  
Fundamental Frequency ◽  
Sound Pressure Level ◽  
Sound Pressure ◽  
Vocal Tract ◽  
Presentation Mode ◽  
Pressure Level ◽  
Presentation Modes ◽  
Audiovisual Stimuli ◽  
Vocal Tract Resonance ◽  
Point Light

Purpose The purpose of this study was twofold: (a) to identify a set of communication-based predictors (including both acoustic and gestural variables) of masculinity–femininity ratings and (b) to explore differences in ratings between audio and audiovisual presentation modes for transgender and cisgender communicators. Method The voices and gestures of a group of cisgender men and women ( n = 10 of each) and transgender women ( n = 20) communicators were recorded while they recounted the story of a cartoon using acoustic and motion capture recording systems. A total of 17 acoustic and gestural variables were measured from these recordings. A group of observers ( n = 20) rated each communicator's masculinity–femininity based on 30- to 45-s samples of the cartoon description presented in three modes: audio, visual, and audio visual. Visual and audiovisual stimuli contained point light displays standardized for size. Ratings were made using a direct magnitude estimation scale without modulus. Communication-based predictors of masculinity–femininity ratings were identified using multiple regression, and analysis of variance was used to determine the effect of presentation mode on perceptual ratings. Results Fundamental frequency, average vowel formant, and sound pressure level were identified as significant predictors of masculinity–femininity ratings for these communicators. Communicators were rated significantly more feminine in the audio than the audiovisual mode and unreliably in the visual-only mode. Conclusions Both study purposes were met. Results support continued emphasis on fundamental frequency and vocal tract resonance in voice and communication modification training with transgender individuals and provide evidence for the potential benefit of modifying sound pressure level, especially when a masculine presentation is desired.

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