scholarly journals Researched on the bias stability of the HRG affected by the temperature and the standing wave azimuth

2020 ◽  
pp. 002029402095246
Author(s):  
Wanliang Zhao ◽  
Hao Yang ◽  
Lijun Song ◽  
Xiangyu Yu ◽  
Fucheng Liu ◽  
...  
Keyword(s):  
Standing Wave ◽  
Control Mode ◽  
Bias Error ◽  
Field Environment ◽  
Bias Stability ◽  
Temperature Experiment ◽  
System Temperature ◽  
Hardware Circuit ◽  
The Relationship ◽  
Main Operating

The force-to-rebalanced control mode is the main operating mechanism of the HRG, and the standing wave azimuth of the resonator points to the 0° direction. But the bias of the HRG is very sensitive to the change of external physical field environment and it is urgent to improve the bias stability. The relationship between the bias of the HRG and the standing wave azimuth is periodic. When the standing wave azimuth and the damping axis are aligned, the bias error of the HRG will be greatly reduced, and the bias stability of the HRG affected by the temperature can also be improved by changing the azimuth of standing wave. In this paper, the control algorithm and the hardware circuit of the HRG are designed to control the HRG at any standing wave azimuths. The control of the HRG in different standing wave azimuths is realized, and the system temperature experiment is carried out. The experimental results show that the bias of the HRG are significantly different at different standing wave azimuths, and the bias stability of the HRG affected by the temperature can be improved 3 times by changing the standing wave azimuth.

Coordination Control of Arm Using Antagonistic Actuators

2002 ◽  
Vol 14 (3) ◽  
pp. 270-277 ◽  
Author(s):  
Toru Oshima ◽  
◽  
Tomohiko Fujikawa ◽  
Minayori Kumamoto ◽  
◽  
...  
Keyword(s):  
Force Control ◽  
Skeletal Muscles ◽  
Control Mode ◽  
Coordination Control ◽  
Mechanical Joint ◽  
Output Force ◽  
Link Model ◽  
The Difference ◽  
The Relationship ◽  
Antagonistic Muscles

In a mechanical joint drive used in robot arms, 1 actuator drives each joint. To drive joints in musculoskeletal animal limbs, in which skeletal muscles are used as actuators, a pair of bi-articular muscles drives 2 joints simultaneously in addition to a pair of monoarticular muscles for driving 1 joint. In our study, the mutual coordination of antagonistic mono-articular and antagonistic bi-articular muscles in in the horizontal arm plane were examined using electromyogram, results were analyzed by a mechanical 2-joint link model, and the relationship between the pattern of coordination of antagonistic muscles and output force generated by the arm clarified. A neural network model that generates the pattern of coordination was proposed to clarify the difference between conventional robots and animals in the force control mode for limbs.

scholarly journals Pavement Temperature Prediction Model for Oman Climate Condition

2017 ◽  
Author(s):  
Amani Al-Kalbani ◽  
Siham G. Farag
Keyword(s):  
Air Temperature ◽  
Asphalt Pavement ◽  
Paper Study ◽  
Climate Condition ◽  
Temperature Prediction ◽  
Development Models ◽  
System Temperature ◽  
Standard Models ◽  
Pavement Temperature ◽  
The Relationship

Asphalt pavement is form an integral part of any transportation system. Temperature is the significant factor that effect on the performance and life span of a pavement. This paper study the relationship between the air temperature and asphalt pavement temperature and using Excel in order to predicate surface asphalt pavement model for Muscat climate. The models were compared with the standard models SHRP and LTPP models [3]. The development models resulted the surface pavement temperature was taken more time in heating cycle than air temperature. When compared the air temperature and surface asphalt pavement temperature with the standards models SHRP and LTPP models. There was difference between them due to the standards models was design for low temperature under zero where in Muscat temperature cannot be under zero [2].

scholarly journals A Comparative Approach of the Environmental Performance between Periods with Positive and Negative Accounting Returns of EEA Companies

2020 ◽  
Vol 12 (18) ◽  
pp. 7382
Author(s):  
Mirela Sichigea ◽  
Marian Ilie Siminica ◽  
Daniel Circiumaru ◽  
Silviu Carstina ◽  
Nela-Loredana Caraba-Meita
Keyword(s):  
Environmental Performance ◽  
Academic Research ◽  
Sustainable Growth ◽  
Comparative Approach ◽  
European Economic Area ◽  
Environmental Behaviour ◽  
Field Environment ◽  
Minerals Processing ◽  
New Perspective ◽  
The Relationship

In recent years, sustainable growth has become an important issue in the business field. Environment, social, and governance (ESG) actions of companies have come to represent key elements in adopting decisions by stakeholders. The question is to what extent they validate the companies’ environmental behaviour, as profitability varies over time. The answer can be obtained by analysing the relationship between environmental performance (EP) and financial performance (FP) of the firms. The paper proposes a new perspective of this relationship, namely, the separate assessment of the EP–FP in the case of positive and negative FP (expressed through accounting returns). A survey on 299 companies in the European Economic Area (EEA), operating in extractives and minerals processing and health care, was conducted. The data were extracted from the Refinitiv database for the period 2009–2018. The findings showed a significant EP–FP correlation in the case of the extractives and minerals processing industry, but their dependency slightly varied on the positive and negative returns’ scenario. As for the healthcare industry, the best result was a moderate correlation between EP and the negative return. Our findings support a managerial design of environmental policy, as well as the future academic research of the EP–FP relationship.

Four-channel sEMG for Elbow Load Recognition

2021 ◽  
Author(s):  
Jiabin Cai ◽  
Junjun Song ◽  
Yuanqiang Long
Keyword(s):  
Neural Network ◽  
Rbf Neural Network ◽  
Wavelet Packet ◽  
Control Mode ◽  
Support Vector ◽  
Semg Signal ◽  
Joint Force ◽  
Emg Signal ◽  
The Relationship ◽  
Rehabilitation Exercise

Abstract In order to help patients after surgery to carry out reasonable rehabilitation training, avoid joint adhesions and movement disorders, the relationship between surface electromyograph (sEMG) signal changes and the size of the patient ' s joint force in the process of rehabilitation exercise was studied, hoping to use the relationship between them to redesign the control mode of the rehabilitation robot, and a method was proposed to identify the size of the elbow load based on wavelet packet. Firstly, s EMG signals of human elbow joint during stretching and bending under different loads were collected by 4-channel surface electromyography. Then, the wavelet packet decomposition method was used to obtain the feature vector composed of energy(E), variance(VAR) and mean absolute value(MAV) of wavelet packet coefficient. Finally, the improved support vector machine ( ISVM), BP neural network and RBF neural network were used for pattern recognition of three different forces. The experimental results show that the change of sEMG signal is indeed related to the size of joint force. It is feasible to identify the load of s EMG signal.

External heat-pulse method allows comparative sapflow measurements in diverse functional types in a Mediterranean-type shrubland in South Africa

2013 ◽  
Vol 40 (10) ◽  
pp. 1076 ◽  
Author(s):  
Robert P. Skelton ◽  
Adam G. West ◽  
Todd E. Dawson ◽  
Jenny M. Leonard
Keyword(s):  
South Africa ◽  
Pulse Method ◽  
External Heat ◽  
Ratio Method ◽  
Functional Types ◽  
Field Environment ◽  
Leaf Level ◽  
Limited Application ◽  
Functionally Diverse ◽  
The Relationship

There has been limited application of sapflow technology to small-stemmed species and across co-existing functional types, restricting its use in diverse floras such as the Mediterranean-type shrubland in South Africa. Our main objective was to test whether sapflow may provide an alternative to traditional gas-exchange measurements, which would permit comparative evaluation of transpiration at a previously unattained temporal resolution. We tested miniature external heat ratio method (HRM) sapflow gauges on three co-occurring functional types with contrasting stem or culm anatomies and examined the relationship between sapflow and shoot- and leaf-level water loss in both a controlled and field environment. Our sapflow gauges captured dynamic patterns of transpiration in both settings for all three functional types. In a controlled environment the relationship between sapflow and transpiration was linear in all three species with r2 values ranging from 0.78 for Cannomois congesta Mast. (Restionaceae) to 0.96 for Protea repens (L.) L. (Proteaceae) and Erica monsoniana L.f. (Ericaceae). In the field, r2 values were lower, ranging from 0.59 for C. congesta to 0.74 for P. repens. We discuss the efficacy and potential of this methodology to cast light on patterns of community ecology in functionally diverse shrublands by capturing continuous variation in transpiration.

Amplifier Bias Stability Design on Output Range Temp. Coefficient

2012 ◽  
Vol 433-440 ◽  
pp. 7368-7374
Author(s):  
Zeng Min Yuan ◽  
Xu Jin Yuan
Keyword(s):  
Temperature Coefficient ◽  
Voltage Divider ◽  
Design Methods ◽  
Bias Stability ◽  
The Relationship

The limitations of empiric design methods for amplifier biasing stability were pointed out. Critical bias and output range of voltage divider biasing amplifier were discussed. The relationship between bias temperature coefficient and β temperature coefficient was discussed as well. The ratio of bias temperature coefficient to β temperature coefficient is defined as effecting factor. Amplifier bias stability is designed based on output range temperature coefficient. The methods for designing base biasing resistance of voltage divider biasing amplifier on the basis of output range temperature coefficient and for analyzing biasing stability of this amplifier are introduced.

Probe Reversal and Pressure Based Bias Error Correction Procedures Applied to Intensity Measurements in Planar Standing Waves

1995 ◽  
Vol 117 (1) ◽  
pp. 56-61
Author(s):  
R. W. Guy ◽  
H. Luchian
Keyword(s):  
Standing Wave ◽  
Standing Waves ◽  
Low Frequency ◽  
Superior Performance ◽  
Bias Error ◽  
Low Frequencies ◽  
Pressure Correction ◽  
Phase Errors ◽  
Intensity Measurements ◽  
Probe Spacing

An analytical application of probe reversal and pressure correction strategies to minimize channel phase errors in P-P intensity measurements within discrete frequency standing waves is made. Two potential error sources, error of position upon reversal and error of pressure correction, are examined and found negligible at low frequencies but likely to be problematic at high frequencies. It is predicted that pressure correction or probe reversal can lead to superior performance when compared with measures without correction at modest and higher standing wave ratios in true intensity assessment; the frequency range for a given probe spacing is also extended. The correction procedures are then applied to low frequency measurements (63 Hz and 125 Hz) for a range of standing wave ratios. It is found that correction procedures generally lead to better results than uncorrected measures, but beyond a standing wave ratio of about 30 dB at 63 Hz additional error source arises which renders inaccurate the result of correction procedures, particularly for smaller probe spacing measures.

On the instability of the flow in an oscillating tank of fluid

1994 ◽  
Vol 268 ◽  
pp. 315-331 ◽  
Author(s):  
Philip Hall
Keyword(s):  
Standing Wave ◽  
Floquet Theory ◽  
Eigenvalue Problems ◽  
Asymptotic Methods ◽  
Linear Regime ◽  
Axis Parallel ◽  
Wave Instabilities ◽  
Oscillation Frequencies ◽  
Unsteady Boundary Layers ◽  
The Relationship

The instability of a viscous fluid inside a rectangular tank oscillating about an axis parallel to the largest face of the tank is investigated in the linear regime. The flow is shown to be unstable to both longitudinal roll and standing wave instabilities. The particular cases of low and high oscillation frequencies are discussed in detail. The relationship between the roll instability and convective or centrifugal instabilities in unsteady boundary layers is discussed. The eigenvalue problems associated with the roll and standing wave instabilities are solved using Floquet theory and a combination of numerical and asymptotic methods. The results obtained are compared to the recent experimental investigation of Bolton & Maurer (1994) which indeed provided the stimulus for the present investigation.

DECISION MAKING OF ROBOT PARTNERS BASED ON FUZZY CONTROL AND BOLTZMANN SELECTION

2011 ◽  
Vol 19 (03) ◽  
pp. 529-545 ◽  
Author(s):  
NAOYUKI KUBOTA ◽  
AIKO YAGUCHI
Keyword(s):  
Sound Field ◽  
Experimental Results ◽  
Human Interaction ◽  
Control Mode ◽  
Reward Function ◽  
Interactive Behavior ◽  
Music Selection ◽  
Music Player ◽  
The Relationship ◽  
Boltzmann Selection

This paper discusses the social learning of robot partners through interaction with a person. We use a robot music player; Miuro, and we focus on the music selection for providing the comfortable sound field for the person. First, we propose the control architecture of Miuro based on autonomous behavior mode, interactive behavior mode, and human control mode. Next, we propose a learning method of the relationship between human interaction and its corresponding reaction based on Boltzmann selection, adaptive reward function, and temperature control. The experimental results show that the proposed method can learn the relationship between human interaction and its corresponding behavior, even if the human intention is changed in the learning. Furthermore, the experimental results show that the proposed method can provide the person the preferable song as the comfortable sound field.

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