The validity of using the limp model for porous materials is addressed in this paper. The limp model is derived from the poroelastic Biot model assuming that the frame has no bulk stiffness. Being an equivalent fluid model accounting for the motion of the frame, it has fewer limitations than the usual equivalent fluid model assuming a rigid frame. A criterion is proposed to identify the porous materials for which the limp model can be used. It relies on a new parameter, the frame stiffness influence (FSI), based on porous material properties. The critical values of FSI under which the limp model can be used are determined using a one-dimensional analytical modeling for two boundary sets: absorption of a porous layer backed by a rigid wall and radiation of a vibrating plate covered by a porous layer. Compared with other criteria, the criterion associated with FSI provides information in a wider frequency range and can be used for configurations that include vibrating plates.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1121/1.2769824 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Design, modeling, and preliminary evaluation of a simple wrist-hand stretching orthosis for neurologically impaired patients.
Wearable Technol
December 2024
Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, USA.
This work studies upper-limb impairment resulting from stroke or traumatic brain injury and presents a simple technological solution for a subset of patients: a soft, active stretching aid for at-home use. To better understand the issues associated with existing associated rehabilitation devices, customer discovery conversations were conducted with 153 people in the healthcare ecosystem (60 patients, 30 caregivers, and 63 medical providers). These patients fell into two populations: spastic (stiff, clenched hands) and flaccid (limp hands).
View Article and Find Full Text PDFATF4 Exacerbates Cerebral Infarction-Induced Sensory Dysfunction via HDAC1/DNMT1/GPX4 Signaling.
Crit Rev Eukaryot Gene Expr
December 2024
Department of General Practice, The First People's Hospital of Yunnan Province, 650032, China; The Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, 650032, China.
Cerebral infarction is the main cause of death and long-term disability worldwide. Neuronal degeneration and limp sensory dysfunction are the secondary damages induced by cerebral infarction. This study aimed to investigate the roles of activating transcription factor 4 (ATF4) in cerebral infarction and the underlying molecular mechanisms.
View Article and Find Full Text PDFDesign, modeling, and preliminary evaluation of a 3D-printed wrist-hand grasping orthosis for stroke survivors.
Wearable Technol
November 2024
Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, USA.
Stroke causes neurological and physical impairment in millions of people around the world every year. To better comprehend the upper-limb needs and challenges stroke survivors face and the issues associated with existing technology and formulate ideas for a technological solution, the authors conversed with 153 members of the ecosystem (60 neuro patients, 30 caregivers, and 63 medical providers). Patients fell into two populations depending on their upper-limb impairment: spastic (stiff, clenched hands) and flaccid (limp hands).
View Article and Find Full Text PDF[Establishment and evaluation of a rabbit model of frozen shoulder induced by persistent strain injuries and ice compression].
Zhongguo Gu Shang
April 2024
Shanghai Guanghua Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai 200052, China; Arthritis Institute of Integrated Traditional Chinese and Western Medicine, Shanghai 200052, China.
Objective: To evaluate the rabbit modle of frozen shoulder induced by persistent strain injuries and ice compression.
Methods: Twelve clean, healthy male New Zealand rabbits with a mass of (2 500±500) g were selected and randomly divided into a blank group and a control group with 6 rabbits in each group. In the control group, the rabbits were modeled with persistent strain injuries and ice compression, the general conditions of the rabbits and the active and passive activities of the shoulder joint were observed and their body weights were recorded.
Predictors of Persistent Limp Following Proximal Femoral Varus Osteotomy for Perthes Disease.
J Pediatr Orthop
August 2024
Department of Orthopaedics, The Children's Hospital of Philadelphia, Philadelphia, PA.
Introduction: One of the most popular containment procedures for Legg-Calvé-Perthes disease (LCPD) is proximal femur varus osteotomy (PFO). While generally successful in achieving containment, PFO can cause limb length discrepancy, abductor weakness, and (of most concern for families) a persistent limp. While many studies have focused on radiographic outcomes following containment surgery, none have analyzed predictors of this persistent limp.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!