AI Article Synopsis
Article Abstract
In this paper, the sound transmission loss (STL) of multi-layered infinite micro-perforated plates (MPPs) is studied. A prediction model for the STL of the multi-layered infinite MPPs is developed, where each MPP may or may not have a perforation, and the number of MPPs is arbitrary. When the frequency of interest is well below the critical frequency of the plate such that the effect of flexural vibration can be neglected compared to that of the inertia term, the mass is replaced by an equivalent complex mass. For numerical examples, single-, double- and triple-layered MPPs are studied. As the perforation ratio increases, the magnitude of the equivalent complex mass decreases rapidly, which in turn results in a decrease of the STL. It is observed that for very small perforation ratios, the mass-spring resonance frequencies in double- and triple-layered MPPs move toward a higher frequency as the perforation ratios increase. In addition, the dips at the resonance frequencies become blunt with increases in the perforation ratios due to the artificial damping induced by micro-perforations. It is also found that at a high frequency, the STL shows dips regardless of the perforation ratios when the wavenumber and air gap depths satisfy certain conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1121/10.0000600 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
[Comparison of short-term outcomes of robotic and laparoscopic surgery for mid-low rectal cancer: a propensity matched analysis].
Zhonghua Wei Chang Wai Ke Za Zhi
December 2024
Northern Jiangsu People's Hospital, Clinical Teaching Hospital of Medical School, Nanjing University, Yangzhou Key Laboratory of Basic and Clinical Transformation of Digestive and Metabolic Diseases, Yangzhou225001, China.
To investigate the short-term efficacy of robotic and laparoscopic surgery for treatment of mid-low rectal cancer. This was a retrospective cohort study of clinical data of patients with mid-low rectal cancer (caudad edge of tumor less than 10 cm from the anal verge) treated with laparoscopic or robotic radical surgery in the Northern Jiangsu People's Hospital Affiliated to Nanjing University from July 2019 to November 2021. Patients whose anus had not been completely preserved, with malignant obstruction or perforation, with poor anal function indicated by preoperative low anterior resection syndrome (LARS) scores, or with incomplete follow-up information were excluded.
View Article and Find Full Text PDFAssociation between perforator stroke after middle cerebral artery elective stenting and arterial remodeling patterns: a high-resolution MRI-based retrospective cohort study.
Quant Imaging Med Surg
December 2024
Department of Neurointervention, the First Affiliated Hospital of Zhengzhou University, Henan Provincial Neurointerventional Engineering Research Center, Zhengzhou, China.
Background: Patterns of arterial remodeling may be associated with outcomes in patients with severe middle cerebral artery (MCA) stenosis after endovascular treatment (EVT). This study aims to investigate the potential correlation between arterial remodeling patterns in patients with severe MCA stenosis, and plaque characteristics and procedure-related perforator stroke (PS).
Methods: Consecutive patients with MCA atherosclerotic disease who underwent EVT at the First Affiliated Hospital of Zhengzhou University from January 2018 to June 2023 were retrospectively enrolled in this study.
[Construction of a prediction model of ultrasound indicators for mortality risk within 7 days in patients with acute myocardial infarction and ventricular septal rupture].
Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
November 2024
Department of Cardiology, Xiangya Third Hospital, Central South University, Changsha 410000, Hunan, China. Corresponding author: Feng Wenchang, Email:
Objective: To investigate the risk factors of death within 7 days in patients with acute myocardial infarction (AMI) complicated by ventricular septal rupture (VSR) based on echocardiography indicators, and to construct a nomogram model of ultrasound indicator risk to predict the risk of death in patients with post-infarction ventricular septal rupture (PIVSR).
Methods: The echocardiographic data of 40 patients with PIVSR admitted to the department of cardiology, Xiangya Third Hospital, Central South University from January 2014 to June 2024 were retrospectively analyzed. The patients were divided into death group and survival group based on their 7-day survival status.
Background: Nontraumatic acute abdominal pain is a common presentation in emergency settings, often requiring surgical intervention. This study aimed to explore the clinical presentations, surgical management, and outcomes in patients with nontraumatic acute abdominal pain, providing insights for improving management strategies.
Methods: This observational study was conducted at a tertiary care hospital in North India and included 433 patients who underwent elective and emergency abdominal surgeries from June 2021 to May 2023.
[Hereditary protein S deficiency in a patient with prominent mesenteric venous thrombosis: A case report].
Beijing Da Xue Xue Bao Yi Xue Ban
December 2024
Department of Rheumatology and Immunology, Peking University Third Hospital, Beijing 100191, China.
Hereditary protein S deficiency (PSD) is an autosomal dominant disorder caused by mutations in the 1 gene which can cause venous thrombosis. Individuals with PSD usually present with recurrent deep vein thrombosis and/or pulmonary embolism, but thrombosis may occur at unusual sites, such as the mesenteric and portal veins. Here we report a case of hereditary protein S deficiency patient with predominant mesenteric venous thrombosis.
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!