scholarly journals Development and Evaluation of a Novel Mechatronic Percussion System

2021 ◽  
Author(s):  
◽  
Trent Little
Keyword(s):  
Unique Feature ◽  
Acoustic Properties ◽  
Variable Pressure ◽  
Maximum Speed ◽  
Percussion System ◽  
Expressive Performance ◽  
Acoustic Quality ◽  
Percussion Instruments ◽  
Set Up ◽  
Location Type

<p>While numerous attempts at creating mechatronic percussion systems exist, many have been limited to only playing a single membranophone or idiophone. These systems inherently lack the ability to reproduce the expressive nature of strikes which human players are capable of and often require manual reconfiguration in order to vary the striking location, type of beater or striking angle. The few which are able to pan across multiple instruments often lack the ability to perform expressively.  We designed a mechatronic percussion system that provides expressivity through controllable variability of the acoustic properties inherent to percussion instruments. Our system can play across the range of an entire traditional drum kit, whether it is set up in a completely horizontal formation, vertically staggered or includes other percussion instruments. When continuously operating at maximum speed, the system is capable of playing for five hours before one subsystem is at risk of failing.  Our system possesses two "wrists", each capable of gripping a variety of beaters. A single wrist can reliably perform single drum strokes at a frequency of 21 Hz, surpassing that of the world's fastest drummer. Operating both wrists results in a striking frequency of 51.9 Hz. The level of force behind each stroke and resultant acoustic quality can be controlled to produce an expressive performance.  A unique feature of this system is the use of a compliant grip, applying variable pressure to the beater held and allows for a variety of beater diameters to be incorporated.</p>

scholarly journals Development and Evaluation of a Novel Mechatronic Percussion System

2021 ◽  
Author(s):  
◽  
Trent Little
Keyword(s):  
Unique Feature ◽  
Acoustic Properties ◽  
Variable Pressure ◽  
Maximum Speed ◽  
Percussion System ◽  
Expressive Performance ◽  
Acoustic Quality ◽  
Percussion Instruments ◽  
Set Up ◽  
Location Type

<p>While numerous attempts at creating mechatronic percussion systems exist, many have been limited to only playing a single membranophone or idiophone. These systems inherently lack the ability to reproduce the expressive nature of strikes which human players are capable of and often require manual reconfiguration in order to vary the striking location, type of beater or striking angle. The few which are able to pan across multiple instruments often lack the ability to perform expressively.  We designed a mechatronic percussion system that provides expressivity through controllable variability of the acoustic properties inherent to percussion instruments. Our system can play across the range of an entire traditional drum kit, whether it is set up in a completely horizontal formation, vertically staggered or includes other percussion instruments. When continuously operating at maximum speed, the system is capable of playing for five hours before one subsystem is at risk of failing.  Our system possesses two "wrists", each capable of gripping a variety of beaters. A single wrist can reliably perform single drum strokes at a frequency of 21 Hz, surpassing that of the world's fastest drummer. Operating both wrists results in a striking frequency of 51.9 Hz. The level of force behind each stroke and resultant acoustic quality can be controlled to produce an expressive performance.  A unique feature of this system is the use of a compliant grip, applying variable pressure to the beater held and allows for a variety of beater diameters to be incorporated.</p>

scholarly journals A Methodology for Recognition of Emotions Based on Speech Analysis, for Applications to Human-Robot Interaction. An Exploratory Study

2014 ◽  
Vol 5 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Mohammad Rabiei ◽  
Alessandro Gasparetto
Keyword(s):  
Exploratory Study ◽  
Speech Rate ◽  
Human Robot Interaction ◽  
Acoustic Properties ◽  
Speech Analysis ◽  
Robot Interaction ◽  
Basic Emotions ◽  
Signal Processing Algorithms ◽  
Recognition Of Emotions ◽  
Set Up

AbstractA system for recognition of emotions based on speech analysis can have interesting applications in human-robot interaction. In this paper, we carry out an exploratory study on the possibility to use a proposed methodology to recognize basic emotions (sadness, surprise, happiness, anger, fear and disgust) based on phonetic and acoustic properties of emotive speech with the minimal use of signal processing algorithms. We set up an experimental test, consisting of choosing three types of speakers, namely: (i) five adult European speakers, (ii) five Asian (Middle East) adult speakers and (iii) five adult American speakers. The speakers had to repeat 6 sentences in English (with durations typically between 1 s and 3 s) in order to emphasize rising-falling intonation and pitch movement. Intensity, peak and range of pitch and speech rate have been evaluated. The proposed methodology consists of generating and analyzing a graph of formant, pitch and intensity, using the open-source PRAAT program. From the experimental results, it was possible to recognize the basic emotions in most of the cases

Development of dwelling in the downstream area of the Nakdong River in Proto-Three Kingdoms Period

2018 ◽  
pp. 61-85
Keyword(s):  
Second Century ◽  
Residential Areas ◽  
Nakdong River ◽  
Second Stage ◽  
Third Stage ◽  
The Nakdong River ◽  
Set Up ◽  
Time Specific ◽  
Location Type ◽  
Downstream Area

This paper examines the developments of dwelling in the downstream area of the Nakdong River during the Proto-Three Kingdoms Period. In the middle of the 2nd century BC, the period of the 2nd century AD was divided into three stages according to the advanced years suggested by advanced researchers. The first stage is the second stage of the first century BC, and the second stage is the second stage of the second century BC. The third stage consisted of the earthenware pottery as the second century. The area was mainly located in Gimhae, Changwon, and Busan, which are located in the lower part of the Nakdong River, and the relics were set up in a residential area located about 5 km from the tomb site. As a result, the selected dwellings are located in 12 places, and the steps are set up referring to the earthenware excavated from the dwellings and tombs. Residential areas classified by phase were analyzed for attributes by location type, plane type, fire facility, and Columna layout and were derived using a combination of time-specific plane forms, fire facility and Columna layout. The type is set for the following types of dwellings : ‘A-a-ㄱ, A-a-ㄷ, A-d-ㄱ, A-d-ㄷ, B-a-ㄷ, B-b1-ㄷ, B-d-ㄷ ’. A local review of the dwelling corresponding to III stage was attempted. As a result, it was found that fire facilities differed and generally preferred wall columna arrangements. The development of the dwelling by level was examined by referring to the natural environment, nearby sites, and documents. The dwelling was located in the hills around the coast and the river to ensure safety, but it seems to have grown by touching the new culture through communication with others.

Calculation Models for Acoustic Analysis of St. Elizabeth of Hungary Church in Jaworzno Szczakowa

2016 ◽  
Vol 41 (3) ◽  
pp. 485-498 ◽  
Author(s):  
Krzysztof Kosała
Keyword(s):  
Acoustic Analysis ◽  
Roman Catholic ◽  
Acoustic Properties ◽  
Roman Catholic Church ◽  
Global Index ◽  
Index Method ◽  
Acoustic Quality ◽  
Single Number ◽  
Calculation Models

Abstract In parallel with research conducted using conventional methods, a uniform index method for assessing the acoustic quality of Roman Catholic churches has been developed. The latest version of the index method has been created using the index observation matrix of 12 churches which have been rated by means of the single number global index. Assessments of the acoustic quality of any Roman Catholic church, using two calculation models: the Global Acoustic Properties Index (GAP) and the Global Index (GI), are shown in the article. The verification was performed on the example of one church, showing the way of calculating global indices to assess the acoustic quality of a new facility. The next stages in the development of the index method for assessing the acoustic quality of churches were taking into account the audience, using simulation tests and determining the spatial distribution of the single number GAP index in an examined church. An attempt to use the GAP and GI calculation models to assess the acoustic properties of some churches is also shown in the article.

Drum Set Training in Music Therapy: A Resource for Students, Clinicians, and Educators

2020 ◽  
Author(s):  
Bill Matney
Keyword(s):  
Music Therapy ◽  
Training Program ◽  
Effective Practice ◽  
Drum Set ◽  
Approach To Learning ◽  
Percussion Instruments ◽  
History Of ◽  
Training And Research ◽  
Set Up ◽  
Program Challenges

Abstract The field of music therapy commonly uses percussion instruments. To some degree, the drum set has been included in the literature. Percussion training, and in this case drum set training, specific to music therapy practice have likely lagged behind the instruments’ uses in the field, potentially resulting in limitations to effective practice. Andragogically speaking, the field benefits from resources that take into account the needs of students and clinicians, while also addressing training program challenges (such as time and accessibility of drum sets). The purpose of this article is to provide an approach to learning the drum set that promotes relevant use and relevant play, without necessarily always needing to be at a drum set to practice. The author first situates the history of the drum set and discusses its common set up and use. Through the use of body percussion, vocalizing/singing, and other processes, the author proposes a way to promote a stronger understanding of how to use the drum set for accompaniment, recreating, composing, and improvising. The author breaks down and scaffolds technical drum set tasks, but then promotes their integration. Visuals and video resources are included. The author concludes with implications for practice, training, and research.

The effects of dolomite-gypsum bonded interfaces on acoustic properties and damage of rock under cyclic bending loads

2020 ◽  
pp. 27-44
Author(s):  
A. S. Voznesenskii ◽  
M. N. Krasilov ◽  
Ya. O. Kutkin ◽  
A. O. Tyutcheva
Keyword(s):  
Elastic Wave ◽  
Quality Factor ◽  
Low Cycle Fatigue ◽  
Complex Structure ◽  
Damage Parameter ◽  
Acoustic Properties ◽  
Q Factor ◽  
Cyclic Bending ◽  
Wave Velocities ◽  
Acoustic Quality

The change in the elastic wave velocities C p, C s1, C s2 and the acoustic quality factor Q of rock beams under cyclic bending loading are considered in the article. The specimen contained bonded dolomite-gypsum boundaries of complex structure. The number of loading cycles and damage parameter w were registered.The experiments were carried out on rock specimens from the Novomoskovsk gypsum field (Tula region, Russia) with bending by a three-point scheme. The upper part of the sample was mainly a layer of dolomite, which had higher strength, lower acoustic loss and higher acoustic quality factor compared to gypsum (which was located mainly in the lower part of the sample). The interface between dolomite and gypsum had a complex spotty texture with the alternation of both minerals. The experiment was carried out in a series of 100 load/unload cycles. The velocities of the longitudinal and transverse elastic waves (along and across the direction of loading), as well as the acoustic Q factor, were measured before and between cycles. The maximum load of the cycle in each subsequent series was increased in comparison with the previous series to find the mode of low cycle fatigue. The elastic wave velocities decreased and the acoustic Q factor increased with an increase in the number of fatigue cycles. Just before destruction, the Q factor showed a sharp decrease associated with the destruction of the matrix. Modeling by the finite element method confirmed the hypothesis that an increase in the quality factor is associated with a weakening of contacts at the boundaries between highquality dolomite and low-quality gypsum. The damage parameter w was estimated as the ratio of the total number of AE event count from the beginning of the experiment to the total number of AE event count at destruction. The accuracy of the regression dependencies of the damage parameter w by the acoustic properties is determined for various amounts.

Key signal and wood anatomy parameters related to the acoustic quality of wood for xylophone-type percussion instruments

2006 ◽  
Vol 52 (3) ◽  
pp. 270-273 ◽  
Author(s):  
Loïc Brancheriau ◽  
Henri Baillères ◽  
Pierre Détienne ◽  
Joseph Gril ◽  
Richard Kronland
Keyword(s):  
Wood Anatomy ◽  
Acoustic Quality ◽  
Percussion Instruments

Permeability Characterize of Polymeric Materials at High-Temperature and High-Pressure

2016 ◽  
Author(s):  
Nooshin Nassr ◽  
Zahed Siddique ◽  
Jon R. Keegan
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Polymeric Materials ◽  
Pressure Change ◽  
Gas Permeation ◽  
Variable Pressure ◽  
Pressure Side ◽  
Set Up ◽  
Increasing Temperature ◽  
Sensitive Pressure

A new experimental set-up has been built to characterize the permeation of polymeric materials. The permeation of Helium through the variety of polymers under different pressure and temperature conditions was investigated. In this study, the gas permeation measurement has been performed by a high temp/high pressure gas permeation cell. Constant volume (variable pressure) procedure was considered to design this gas permeation cell. In designing the permeation cell, special consideration has been made to build a permeation cell appropriate for testing polymer samples in high pressure (up to 1200 psi) and high temperature (up to 100 °C) conditions. The permeation cell consists of two gas chambers; the high pressure side and the low pressure side. A modular plugin has been designed to place inside the gas chambers, and make the design adjustable for testing polymers with different thicknesses. Pressure change in the lower side of the set-up was measured by sensitive pressure transducer. Downstream pressure side will be used in the calculation of gas flux and gas permeation coefficient of polymers, along with differential pressure applied to polymer sample and test conditions as temperature. The results of permeability measurements for thick polymer samples at different pressure and temperature showed that the effects of increasing temperature on gas permeation are prominent compared to effect of high pressure condition.

THE IMPACT OF ACOUSTIC OF SELECTED SPACES ON PERCUSSION INSTRUMENTS

Akustika ◽  
2020 ◽  
pp. 37-85
Author(s):  
Vojtěch Ondrejka ◽  
Tomáš Gergeĺ ◽  
Anna Danihelová ◽  
Martin Čulík ◽  
Dagmara Bednárová ◽  
...  
Keyword(s):  
Sound Quality ◽  
Musical Instrument ◽  
Musical Instruments ◽  
Acoustic Properties ◽  
Reverberation Time ◽  
Percussion Instruments ◽  
Percussion Instrument ◽  
The Impact ◽  
Physical Quantities

The results of the investigation of the room acoustic properties influence on the perception of the sound of percussion musical instruments are presented in the paper. At first, the acoustic properties of two rooms were determined without musical instrument. Subsequently, the acoustic properties of the rooms were determined during the presentation of cajon music. On the base of reverberation time (EDT, T30), Clarity C80, Definition D50 and bass index BI) we can conclude that the room of the Hron cinema is more suitable for musical presentation, but it cannot be considered as ideal one. The Royal Hall of Zvolen Castle has a smaller influence on the sound of a percussion instrument. The influence of room acoustic properties on the resulting sound of the instrument was evaluated only on the base of results obtained with using the objective methods by the physical quantities measurement. Finally, the design of these rooms modification is presented to achieve a better sound quality of percussion instruments.

scholarly journals From Architectural Acoustics to Acoustical Architecture Using Computer Simulation

2005 ◽  
Vol 12 (2) ◽  
pp. 85-98 ◽  
Author(s):  
Anne Marie Due Schmidt ◽  
Poul Henning Kirkegaard
Keyword(s):  
Design Process ◽  
Architectural Design ◽  
Acoustic Properties ◽  
Architectural Acoustics ◽  
Acoustic Design ◽  
Advantages And Disadvantages ◽  
Acoustic Simulation ◽  
Set Up ◽  
The Right

Architectural acoustics design has in the past been based on simple design rules. However, with a growing complexity in architectural acoustics and the emergence of room acoustic simulation programmes with considerable potential, it is now possible to subjectively analyse and evaluate acoustic properties prior to the actual construction of a building. With the right tools applied, acoustic design can become an integral part of the architectural design process. The aim of this paper is to investigate the field of application that an acoustic simulation programme can have during an architectural acoustic design process and to set up a strategy to develop future programmes. The emphasis is put on the first three out of four phases in the working process of the architect and a case study is carried out in which each phase is represented by typical results – as exemplified with reference to the design of Bagsvaerd Church by Jørn Utzon. The paper discusses the advantages and disadvantages of the programme in each phase compared to the works of architects not using acoustic simulation programmes. The conclusion of the paper points towards the need to apply the acoustic simulation programmes to the first phases in the architectural process and set out a reverse strategy for simulation programmes to do so – from developing acoustics from given spaces to developing spaces from given acoustics.

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