scholarly journals Reverberation Time and Absorption Measurements with the High Speed Level Recorder

1934 ◽  
Vol 5 (3) ◽  
pp. 220-220
Author(s):  
E. H. Bedell ◽  
K. D. Swartzel
Keyword(s):  
High Speed ◽  
Reverberation Time ◽  
Speed Level ◽  
Level Recorder ◽  
Absorption Measurements

A New High Speed Level Recorder

1949 ◽  
Vol 21 (2) ◽  
pp. 91-93 ◽  
Author(s):  
P. V. Bruel ◽  
Uno Ingård
Keyword(s):  
High Speed ◽  
Speed Level ◽  
Level Recorder

A High Speed Level Recorder for Acoustic Measurements

1935 ◽  
Vol 6 (3) ◽  
pp. 121-129 ◽  
Author(s):  
E. C. Wente ◽  
E. H. Bedell ◽  
K. D. Swartzel
Keyword(s):  
High Speed ◽  
Acoustic Measurements ◽  
Speed Level ◽  
Level Recorder

scholarly journals A High Speed Level Recorder and Some of Its Uses in Acoustical Measurements

1933 ◽  
Vol 5 (1) ◽  
pp. 65-65 ◽  
Author(s):  
E. C. Wente ◽  
E. H. Bedell ◽  
K. D. Swartzel
Keyword(s):  
High Speed ◽  
Speed Level ◽  
Level Recorder

Some Effects of Tactile and Auditory Alterations on Speech Output

1963 ◽  
Vol 6 (4) ◽  
pp. 369-378 ◽  
Author(s):  
Robert L. Ringel ◽  
M. D. Steer
Keyword(s):  
High Speed ◽  
Sensory Information ◽  
Peak Level ◽  
Normal Subjects ◽  
Simultaneous Administration ◽  
Oral Region ◽  
Speech Output ◽  
Sensory Disturbances ◽  
Speed Level ◽  
Level Recorder

This investigation studied the effects on articulation, duration, average peak level, and fundamental frequency of speech demonstrated by normal subjects when oral region tactile and/or auditory sensory information is altered. Thirteen female subjects read a standard passage under the following six conditions: (a) control; (b) binaural masking; (c) topical anesthetization of the oral region by application of Xylocaine HCl 4%; (d) local anesthetization of the oral region by bilateral mandibular and infra-orbital nerve block techniques employing Xylocaine HCL 2%; (e) simultaneous administration of conditions b and c; (f) simultaneous administration of conditions b and d. Recorded speech samples for all conditions were subjected to analysis by use of a high speed level recorder, a phonation timer, and an oscillographic technique. The speech samples were also analyzed for articulatory deviations by a panel of judges. Statistical analysis of the data indicated that significant alterations in average peak level, articulation, and rate variability occur under conditions of altered tactile sensation. Similar trends were also noted for the mean syllable duration and phonation/time ratio variables. In addition it was found that the effects of multiple sensory disturbances are cumulative in nature for certain speech output variables.

Probability of Ship High-Runs from Phase-Space Data

2019 ◽  
Author(s):  
Ioannis Kontolefas ◽  
Kostas J. Spyrou
Keyword(s):  
Phase Space ◽  
Coherent Structures ◽  
High Speed ◽  
Statistical Information ◽  
Motion Patterns ◽  
Following Seas ◽  
Probability Calculation ◽  
Speed Level ◽  
Surf Riding ◽  
Space Data

A clustering scheme has been applied for capturing qualitatively different surge motion patterns in the phase space. The scheme enables the identification of “high-run” incidents as soon as such motions are triggered and while their phenomenology has not yet been well developed. A “high run” is a surf-riding–like behavior, appearing in irregular following seas. The concept of finite-time coherent sets is exploited for deriving estimates of the probability of high-runs. The method is verified by identifying independently the corresponding hyperbolic Lagrangian coherent structures; then, consistency is sought between the two approaches. An important feature of the method is that it does not rely on the use of some empirical criterion for the high-run threshold, such as one based on the exceedance of an arbitrary high-speed level. Despite its computational burden, the proposed scheme offers “objective” statistical information on a ship’s high-run tendency that can be used for benchmarking simpler (approximative) probability calculation schemes.

Probability of Ship High-Runs from Phase-Space Data

2019 ◽  
Author(s):  
Ioannis Kontolefas ◽  
Kostas J. Spyrou
Keyword(s):  
Phase Space ◽  
Coherent Structures ◽  
High Speed ◽  
Statistical Information ◽  
Motion Patterns ◽  
Following Seas ◽  
Probability Calculation ◽  
Speed Level ◽  
Surf Riding ◽  
Space Data

A clustering scheme has been applied for capturing qualitatively different surge motion patterns in the phase space. The scheme enables the identification of “high-run” incidents as soon as such motions are triggered and while their phenomenology has not yet been well developed. A “high run” is a surf-riding–like behavior, appearing in irregular following seas. The concept of finite-time coherent sets is exploited for deriving estimates of the probability of high-runs. The method is verified by identifying independently the corresponding hyperbolic Lagrangian coherent structures; then, consistency is sought between the two approaches. An important feature of the method is that it does not rely on the use of some empirical criterion for the high-run threshold, such as one based on the exceedance of an arbitrary high-speed level. Despite its computational burden, the proposed scheme offers “objective” statistical information on a ship’s high-run tendency that can be used for benchmarking simpler (approximative) probability calculation schemes.

Probability of Ship High-Runs from Phase-Space Data

2020 ◽  
Vol 64 (01) ◽  
pp. 81-97
Author(s):  
Ioannis Kontolefas ◽  
Kostas J. Spyrou
Keyword(s):  
Phase Space ◽  
High Speed ◽  
Abnormal Behavior ◽  
Motion Patterns ◽  
Following Seas ◽  
Wave Celerity ◽  
Speed Level ◽  
Surf Riding ◽  
Space Data ◽  
Nonlinear Ship Motion

A clustering scheme has been applied for capturing qualitatively different surge motion patterns in the phase space. The scheme enables the identification of "high-run" incidents as soon as such motions are triggered and while their phenomenology has not yet been well developed. A "high run" is a surf-riding-like behavior, appearing in irregular following seas. The concept of finite-time coherent sets is exploited for deriving estimates of the probability of high-runs. The method is verified by identifying independently the corresponding hyperbolic Lagrangian coherent structures; then, consistency is sought between the two approaches. An important feature of the method is that it does not rely on the use of some empirical criterion for the high-run threshold, such as one based on the exceedance of an arbitrary high-speed level. Despite its computational burden, the proposed scheme offers "objective" statistical information on a ship's high-run tendency that can be used for benchmarking simpler (approximative) probability calculation schemes. 1. Introduction Current efforts to assess a ship's tendency for abnormal behavior in extreme seas are still limited from our inadequate grasp of the full variety of nonlinear ship motion phenomena that could be realized in an irregular seaway. A classification of these motion patterns would provide a sound basis for developing probabilistic calculation methods of ship operability and safety in extreme seas. A few recent research efforts in our group have been related to this target. In one case, it was endeavored to distinguish ship high-runs from ordinary surging, by engaging the concept of instantaneous wave celerity (Spyrou et al. 2014). In another, the derivation of a practical metric for the probability of high-run was pursued (Belenky et al. 2016). Also, high-run and broaching-to statistics were produced through a direct approach based on assigning prescriptive exceedance thresholds (Spyrou et al. 2016b). Moreover, the theory of surf-riding was extended for bichromatic waves, revealing some rather unexpected types of motion (Spyrou et al. 2018). Even richer phenomena could be conjectured for a multifrequency environment.

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