Design of an H-shaped linear piezoelectric motor for safety and arming device
Publication date: Available online 22 October 2019Source: Sensors and Actuators A: PhysicalAuthor(s): Dong Sun, Yu-juan Tang, Jiong Wang, Xin-jie WangAbstractIn this contribution, an H-shaped piezoelectric motor based safety and arming device that is driven by the hybrid of symmetrical first longitudinal mode and second bending mode is proposed, designed and experimental investigated. The proposed system operates based on the concept of self-moving and show potential infield of fuse system with different calibers. The actuating mechanism is that the four driving feet contact with the guides alternately and push the motor to move continuously. Modal and harmonic analysis are conducted to determine the dimension of the structure, confirm the working principle and analyze the motion trajectories of driving feet with finite element method. It is shown that trajectories of the driving feet are oblique ellipses with different angles because of the asymmetry of structure. In addition, a prototype is fabricated and experimented. The results show that the average speeds of the prototype in two directions are 120.6mm/s and 130.1mm/s respectively under the driving voltage of 120V0-p and working frequency of 88.5kHz. The H-shaped piezoelectric motor based safety and arming device can change its state from safety to arming or reversely in 25ms with the fixed stroke of 3mm.Graphical abstract
The inflammation-fighting drug colchicine, already a treatment for gout, dramatically reduces the odds of future cardiovascular problems in people who have just survived a heart attack, a large new study by a Montreal researcher has concluded.
(Reuters Health) - The inflammation-fighting drug colchicine, already a treatment for gout, dramatically reduces the odds of future cardiovascular problems in people who have just survived a heart attack, a large new study has concluded.
The palm print identity authentication system connects 750,000 patients to their Epic EHR – in one case, even when a patient was having a stroke and unable to speak.
Conditions: Stroke, Ischemic; Stroke Hemorrhagic Interventions: Device: Anodal transcranial direct current stimulation (A-tDCS); Device: Cathodal transcranial direct current stimulation (C-tDCS); Device: Sham stimulation (sham-tDCS); Behavioral: Neuromotor training Sponsors: IRCCS Centro San Giovanni di Dio Fatebenefratelli; San Gerardo Hospital; Maggiore Bellaria Hospital, Bologna; Azienda Ospedaliero, Universitaria Pisana; Fondazione Don...
Conditions: Stroke; Treatment Adherence; Patient Satisfaction; Brain Injuries, Traumatic Interventions: Other: Conventional therapy; Other: Leap motion plus conventional therapya Sponsor: Universidad Rey Juan Carlos Active, not recruiting
Conditions: Stroke; Aphasia Interventions: Device: Transcranial Direct Current Stimulation; Device: Sham Transcranial Direct Current Stimulation; Behavioral: Phonologic-Focused Speech Therapy; Behavioral: Semantic-Focused Speech Therapy Sponsor: Medical College of Wisconsin Not yet recruiting
Condition: Stroke Intervention: Sponsors: Northwestern University; National Institute of Neurological Disorders and Stroke (NINDS); Shirley Ryan AbilityLab Not yet recruiting
In the new trial, colchicine reduced by as much as 34% a heart attack survivor's combined risk of either dying from heart disease or having cardiac arrest, a heart attack, a stroke or angioplasty.
The center of mass of the body in patients with stroke was oriented toward the nonparetic side. Abnormal weight shift increases the risk of falls. Therefore, many therapists make an effort to help their functional recovery through balance training. Our aim...
Toxic air contributes to health conditions such as asthma, cancer and stroke, say expertsFive people die each week in Bristol as a result of high levels of air pollution, a study has revealed.Researchers at King ’s College London examined the combined impact of PM2.5, which is mainly from domestic wood and coal burning and industrial combustion and nitrogen dioxide, which mainly comes from older polluting vehicles.Continue reading...