scholarly journals Low-cost Active Dry-Contact Surface EMG Sensor for Bionic Arms

2020 ◽  
Author(s):  
Asma M. Naim ◽  
Kithmin Wickramasinghe ◽  
Ashwin De Silva ◽  
Malsha V. Perera ◽  
Thilina Dulantha Lalitharatne ◽  
...  
Keyword(s):  
Contact Surface ◽  
Low Cost ◽  
Surface Emg ◽  
Dry Contact

УСОВЕРШЕНСТВОВАННАЯ ТЕХНОЛОГИЯ РЕМОНТА ЭЛЕКТРОГИДРАВЛИЧЕСКИХ ФОРСУНОК АВТОТРАКТОРНЫХ ДИЗЕЛЕЙ

2020 ◽  
Vol 4 (141) ◽  
pp. 74-82
Author(s):  
SERGEY TIMOKHIN ◽  
◽  
PAVEL BOGATYREV ◽  
DMITRIY GALIN ◽  
Keyword(s):  
Contact Surface ◽  
Diesel Engines ◽  
Low Cost ◽  
Ball Valve ◽  
Point Of View ◽  
Research Purpose ◽  
Process Time ◽  
Valve Seat ◽  
Economic Point ◽  
Ring Shape

The actual service life of electrohydraulic injectors of automotive diesel engines with a high-pressure battery system of the Common Rail type in operation is significantly lower than the claimed one, and its restoration by repair is relevant from a technical and economic point of view. One of the most wearable elements of electrohydraulic injectors is the contact surface of the ball valve seat. (Research purpose) The research purpose is in developing an improved technology for repairing electro-hydraulic injectors of automotive diesel engines with a vibration-rivet of the contact surface of the ball valve seat. (Materials and methods) The article presents the carried out theoretical substantiation of the process of vibration riveting of the ball valve seat of electrohydraulic injectors and its laboratory and bench studies using serial stands for testing electrohydraulic injectors, checking their elements and restoring the seat geometry by lapping, an electronic digital microscope. (Results and discussion) Authors confirmed the working hypothesis about the possibility of forming the ring contact surface of the ball valve of electrohydraulic injectors reinforced with a vibration riveting by creating certain hydraulic and electrical modes of its operation during the required time. For the model 0445110376 electrohydraulic injectors of the Cummins ISF 2.8 diesel engine, the total area of the hardened surface of the regular ring shape was 0.07 square millimeters, and the depth was about 0.003 millimeters with a process time of 45 minutes. The parameters of the experimental electrohydraulic injectors met the requirements of the test plan, and they are currently successfully undergoing operational tests. (Conclusions) The use of a valve seat vibration rivet will increase the life of repaired injectors at a low cost for its implementation.

scholarly journals Low-cost wearable multichannel surface EMG acquisition for prosthetic hand control

2015 ◽  
Author(s):  
Davide Brunelli ◽  
Andualem Maereg Tadesse ◽  
Bernhard Vodermayer ◽  
Markus Nowak ◽  
Claudio Castellini
Keyword(s):  
Low Cost ◽  
Surface Emg ◽  
Prosthetic Hand ◽  
Hand Control

scholarly journals A Wearable In-Ear EEG Device for Emotion Monitoring

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4014 ◽  
Author(s):  
Athavipach ◽  
Pan-ngum ◽  
Israsena
Keyword(s):  
Single Channel ◽  
Low Cost ◽  
Emotion Classification ◽  
Healthcare Applications ◽  
Home Based ◽  
Dry Contact ◽  
Emotion Model ◽  
Preliminary Study ◽  
Valence And Arousal ◽  
Tele Monitoring

For future healthcare applications, which are increasingly moving towards out-of-hospital or home-based caring models, the ability to remotely and continuously monitor patients’ conditions effectively are imperative. Among others, emotional state is one of the conditions that could be of interest to doctors or caregivers. This paper discusses a preliminary study to develop a wearable device that is a low cost, single channel, dry contact, in-ear EEG suitable for non-intrusive monitoring. All aspects of the designs, engineering, and experimenting by applying machine learning for emotion classification, are covered. Based on the valence and arousal emotion model, the device is able to classify basic emotion with 71.07% accuracy (valence), 72.89% accuracy (arousal), and 53.72% (all four emotions). The results are comparable to those measured from the more conventional EEG headsets at T7 and T8 scalp positions. These results, together with its earphone-like wearability, suggest its potential usage especially for future healthcare applications, such as home-based or tele-monitoring systems as intended.

scholarly journals A Soft Exoskeleton Glove for Hand Bilateral Training via Surface EMG

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 578
Author(s):  
Yumiao Chen ◽  
Zhongliang Yang ◽  
Yangliang Wen
Keyword(s):  
Hybrid Model ◽  
Low Cost ◽  
Surface Emg ◽  
Geometrical Parameters ◽  
Motion Patterns ◽  
Hand Motion ◽  
Model Combining ◽  
Bilateral Training ◽  
Soft Actuators ◽  
Semg Signals

Traditional rigid exoskeletons can be challenging to the comfort of wearers and can have large pressure, which can even alter natural hand motion patterns. In this paper, we propose a low-cost soft exoskeleton glove (SExoG) system driven by surface electromyography (sEMG) signals from non-paretic hand for bilateral training. A customization method of geometrical parameters of soft actuators was presented, and their structure was redesigned. Then, the corresponding pressure values of air-pump to generate different angles of actuators were determined to support four hand motions (extension, rest, spherical grip, and fist). A two-step hybrid model combining the neural network and the state exclusion algorithm was proposed to recognize four hand motions via sEMG signals from the healthy limb. Four subjects were recruited to participate in the experiments. The experimental results show that the pressure values for the four hand motions were about −2, 0, 40, and 70 KPa, and the hybrid model can yield a mean accuracy of 98.7% across four hand motions. It can be concluded that the novel SExoG system can mirror the hand motions of non-paretic hand with good performance.

scholarly journals Evaluation of a Low Cost Prosthetic Hand Controlled by Surface EMG Sensors and Vibrotactile Feedback

2018 ◽  
Vol 13 (2) ◽  
pp. 69-78
Author(s):  
Victor Argueta-Diaz ◽  
Cameron J Spitzfaden ◽  
Durham Basso ◽  
Hope L Ayers
Keyword(s):  
Low Cost ◽  
Surface Emg ◽  
Average Score ◽  
Prosthetic Hand ◽  
Vibrotactile Feedback ◽  
Semg Signal ◽  
Subjective Data ◽  
Feedback Type ◽  
Control Schemes ◽  
Flexor Digitorum

This study proposes a prosthetic hand with a simple control algorithm and off-the-shelf electronics. We designed this hand to be used and repaired in underdeveloped regions.  A differential sEMG signal is obtained from the flexor digitorum superficialis and extensor digitorum muscles to control the position of the hand’s grasp.  Three different hand control schemes (visual, vibrotactile and visual plus vibrotactile) were compared and tested in ten able-bodied individuals.  We observed a better performance of the visual and vibrotactile control overall, but the vibrotactile feedback increased performance after several interactions.  In subjective data evaluations vibrotactile and visual feedback had the highest scores in light and medium pressures, while visual-only feedback type had the highest average score for hard pressure.

scholarly journals Low-cost electromyography: validity against a commercial system depends on exercise type and intensity

2021 ◽  
Author(s):  
Paolo Tecchio ◽  
Andrea Monte ◽  
Paola Zamparo
Keyword(s):  
Vastus Lateralis ◽  
Low Cost ◽  
Surface Emg ◽  
Knee Extensors ◽  
Experimental Conditions ◽  
Semg Signal ◽  
Time To Peak ◽  
Custom Made ◽  
Significant Difference ◽  
Correlation Parameters

The aim of this study was to assess the validity of a custom-made low cost (LC) and a commercial surface EMG apparatus in controlled experimental conditions and different exercise types: maximal voluntary contractions (MVC) at 105, 90, 75, 60, 45 and 30° knee angle and explosive fix-end contractions of the knee extensors (75°) at an isometric dynamometer. sEMG of vastus lateralis was recorded from the same electrodes simultaneously, then analyzed in the same way; sEMG were finally expressed in percentage of those collected at 75°MVC. LC underestimated the sEMG signal at the more extended knee angles (30-60°), significant difference was observed only at 30°. In the explosive contractions no differences between devices were observed in average and peak sEMG, as well as in the time to peak and the activation time. Bland-Altman tests and correlation parameters indicate the LC device is not sensible enough to detect the time to peak and the peak values of the sEMG signal properly. Results suggest low-cost systems might be a valid alternative to commercial ones, but attention must be paid when analyzing rapid events.

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