Table 1 - uploaded by Maria Lucia Machado Duarte
Content may be subject to copyright.
Source publication
The well being of people needs to be a priority in the modern world. In that respect, vibration cannot be one more cause of stress. Besides that, vibration comfort is very important, since high levels may cause health or even tasks' accomplishment problems. Several parameters may influence the levels of vibration a human being supports. Among them,...
Contexts in source publication
Context 1
... the frequencies found through these studies differ slightly from reality but serves as an important reference source. Table 1 presents some resonance frequency values of human body organs collected from [1,20], as presented in [9]. ...
Context 2
... the same organ, in the same subject, can also have different values depending on the circumstances due to the intra-variability of the results [5]. Nevertheless, the frequencies presented in Table 1 may be used to interpret results obtained during whole-body vibration studies. ...
Context 3
... value of acceleration measured increased with the increase of the frequency (i.e., the sensibility decreased) until reaching a peak between 40 Hz and 50 Hz and later it decreased again. The results may have been influenced by the resonance frequencies of the head and ocular globe, as shown in Table 1. That same behavior was verified in the analysis of the parameters gender [9,10], corporal mass index (CMI) and age in previous studies [15], so indicating that, independent of the parameter under investigation, the subjects are more sensitive in lower than in upper frequencies [2], agreeing with the other researchers' results and standards [8,14,16]. ...
Citations
... The state-of-the-art research on timber floor vibrations encompasses many factors influencing human perception, floor performance, and evaluation methods [11]. The complexity of the problem is evident from the absence of a single criterion, leading to the development of multiple vibration design guidelines [12,13]. Early studies by Meister (1931,1932) [14,15] highlighted that human perception thresholds were influenced by vibration velocity, amplitude, and frequency. ...
... Current research into timber floor vibration performance evaluation considers numerous factors that impact human perception, floor performance, and evaluation methodologies [27]. The complexity of this issue is laid bare by the absence of a sole evaluation criterion, leading to the emergence of multiple vibration design guidelines [28,29]. Pioneering work by Meister (1931,1932) [30,31] highlighted the influence of vibration velocity, amplitude, and frequency on human perception thresholds [32]. ...
Cross-laminated timber (CLT) floors often encounter vibration issues when employed in large spans bearing heavy loads, and the enhancement of their vibration performance frequently centres around achieving composite action. This study delves into the effectiveness of hybrid CLT-steel composite floors as potential substitutes for traditional, long-span CLT floors. A parametric model was developed using OpenSeesPy and validated with prior vibration experimental tests on hybrid and pure CLT floors. It was then employed in examining the sensitivities of the floors to various excitation scenarios via an integrated random walk model used to generate random dynamic responses. Two extreme boundary conditions: pinned-pinned and clamped-clamped, were also simulated to investigate the limits of the vibration response of the hybrid composite floor. The chosen metrics for assessment comprised fundamental frequency, vibration dose value, peak acceleration and velocity, response factor, as well as root-mean-square acceleration and velocity. These metrics were also juxtaposed against the predictions put forth by the new Eurocode 5 draft. Though the fundamental frequency of the much-stiffer hybrid composite floor was about thrice that of the bare CLT, the considerably lower damping of the former-about 60 % less, resulted in a comparable acceleration response with the CLT floor. Also, despite a 55% increase in fundamental frequency when the hybrid floor was simulated with clamped supports, the resulting serviceability metrics did not indicate a clear-cut performance improvement over the pinned boundary condition. The results highlight the leading influence of damping rather than bending stiffness and fundamental frequency on the serviceability metrics of hybrid CLT-steel composite floors.
... Two elements i.e. frequency and harmony were provided by musical mathematics, and these were the fundamental concept of LMHM i.e. the soul in music. Therefore, the LMHM could theoretically affect the brain of human being by interaction between music and brain wave (Hero, 1978 Figure.7 (Duarte and Pereira, 2006). The interaction between the LMHM and the organs of human being could be a type of resonance relation. ...
Acupuncture has been a very important treatment in traditional Chinese medicine (TCM). In this study, the acupuncture treatments according to the nine symptoms of human being were roughly described including weight-losing, eczema, side effects of cosmetic surgery, pain-improving, adjusting gastrointestinal function, improving sleep problem, treating Mood Illness, treating stroke sequelae and pains or other side effects of aids, coronavirus disease, 2019 (COVID-19), cancer during the recovery process. Acupuncture combining a type of medical resonance therapy music (MRTM) called Lambdoma matrix harmonic Music (LMHM) could be a performable treatment proposal to treat insomnia. The 21 insomnia patients with the same live environment and diet in a nursing home were selected to treat. In treatment process, let them stop using any sleep pills and the treatment time was from 01, April to 30, April 2023 (Taiwan standard time, TST). The treatment time point was set at pm: 9 every day (bedtime). Results shown the 14 patients could sleep without sleep pills in the treatment time. After this treatment, these 14 patients only needed half the dose required to sleep. The spectra of the LMHM, Protein music (PM), the MRTM of Peter Hübner (MRTM-PH) and Guqin music (GM) have shown high similarity. The PM was composed by converting protein sequences and genes. The MRTM-PH and the GM were recognized as having good therapy music. Therefore, the LMHM combing with acupuncture could have the ability to treat insomnia.
... Particularly dangerous is the amplification of vibrations for the frequency of about 4 Hz obtained for the chest and seat, as it is the resonant frequency of some internal organs such as the liver or arms [34]. Studies have also shown amplification at a frequency of 15 Hz, which in turn has a negative effect on the spine and may explain the pain in the lumbar spine, reported by people using a wheelchair. ...
The article presents the results of research on the influence of whole body vibrations (WBVs) on a person moving in a wheelchair. The tests were carried out using an electrohydraulic shaker for a kinematic harmonic excitation with a constant amplitude and frequencies, respectively, 2, 5, 10, 15, and 20 Hz. The accelerations caused by vibrations were measured with three-axis accelerometers at three measuring points: on the seat, chest, and head of the examined person. The research included frequency and statistical analyses of vibrations. The analyses were focused on the course of the transition functions over frequency. The range of the disabled person’s exposure to the negative factor which is WBVs was assessed.
... Each organ generates a unique resonance frequency (RF) [13,14]. The vibration frequencies of significant bodily functions (organs and systems) range from 3 to 17 Hz. ...
... However, according to the International Standard ISO 2631, the sensitive range in the vertical vibration of the human body is 6 to 8 Hz [15]. Figure 3 details the RFs of particular human organs [13,14]. In humans, the vibrational frequency may be traced to the cellular level. ...
Sound therapy is a revolutionary approach for medical treatment and prevention, transforming the current treatment landscape. The therapy is based on the notion of resonance. Typically, in homeostasis, electromagnetic fields-surrounding the body and all organs, cells, bones, tissues, and liquids-have a healthy a healthy vibratory frequency. Sound wave treatment induces profound relaxation, which facilitates the healing of emotional anguish and scars. Sound therapy helps a person release fear and sadness, improves the feelings of loneliness and despair, "cleanses" harmful emotions, and provides constructive insights regarding emotional conflicts. It also helps alleviate physical disorders, such as aches and pains, muscle and connective tissue difficulties, mobility issues, postoperative rehabilitation, and tinnitus. Also, it can be used as adjunctive therapy with standard cancer treatments. This review article discusses the importance of sound therapy and the pioneers' use of sound strategies to heal. The review also highlights the frequencies generated by different body organs and how to detect diseases based on changes in these frequencies. Furthermore, tools used to administer healthy frequencies to diseased cells and the future of sound therapy are offered and explained.
... Hence, there is an increment of the Power Spectral Density when dolphin is closer to the patient, and thus a certain resonance frequency is yielded in specific parts of the patient's body (see Table I). [8,27] Therefore, the main issue is that dolphin's sonar produces resonance of different parts of the human body, yielding effects on the nervous system of the patient via psychological changes [33]. This process is attributed to the generation of endorphin in the brain, bringing about the activation of collagen molecules throughout the body. ...
... It is also clear that prolong period of WBV exposure may cause several unwanted effects such as damaging health or cause discomfort which disrupts daily activities. [2] When exposed to vibrations, the body endures stresses which have a mechanical effect on it depending on the dynamic properties of the body. By understanding all these effects and harm vibrations can cause to the human body, it is clear that human body vibrations should be further studied and look into to provide an economical method to deal with these issues. ...
Human is exposed to whole-body vibration either in sitting, standing or recumbent
position. Many studies had been carried out to study the vibration responses and develop the
mathematical modelling in sitting and standing vertical position. According to previous studies,
the resonant frequencies of the human body were identified to be in the range of 4-6 Hz and 8-
12 Hz in the vertical position. Recumbent whole-body vibration also plays an important role as
many situations in our everyday life are related to recumbent whole-body vibrations such as
riding a train, ambulance transporting a patient or even sleeping. However, the studies of
recumbent whole-body vibration are very lacking. Therefore, the main objective of this study is
to develop a mathematical model to identify the response when a human body is subjected to
recumbent whole-body vibrations. In this study, a nine degree of freedom mathematical model
was developed, and the responses of the body were analyzed using Matlab Simulink. The overall
resonant frequency of the body was found to be 1.4 Hz. Meanwhile, the head and neck had two
resonant frequencies, which were 1.3 and 3.28 Hz for the head, and 1.4 and 3.4 Hz for the neck.
This newly developed mathematical model can be used as a fundamental model to predict the
response of any recumbent whole-body vibration.
... Excessive noise and vibration are harmful to human health with no doubt, while the evaluation of their impacts can be subjective [5,6]. It not only affects hearing but also has adverse effects on the cardiovascular system, nervous system, and endocrine system [7][8][9]. The effects of noise and vibrations on human beings were discussed by studying different urban areas or different types of noise and vibration sources. ...
Environmental noise and vibration induced by building construction are increasingly prominent in daily life. If the noise and vibration level exceeds the corresponding standard limits stipulated by the country, humans’ normal life, working, or studying efficiency would be interfered. This paper aims to explore how residents respond to noise and vibration mainly induced by the building construction. The noise and vibration measurements, as well as a questionnaire survey, were conducted. Through analysis and comparisons, it is shown that the noise impacts were concentrated in the area near the construction site. For the noise and vibration transmission within the building, the noise levels were amplified in the lower floors and gradually attenuated with floors, and the vibration levels decayed with the floors. The noise impact was much greater than the vibration impact. Building construction was found to be one of the most annoying noise and vibration sources, while the subway operation has little impact on residents according to either subjective or objective evaluation. The ratio of noise and vibration dissatisfaction was less than that of annoyance, which demonstrated that the residents’ psychological capacity was high toward the impact of noise and vibration. The proposed dose-response relationship can apply in a similar community environment. Once the noise levels within the building obtained, the residents’ noise annoyance can then be estimated.
... Although some have published values for resonance frequencies of various body parts (e.g., Duarte & Pereira, 2006), meaning those frequencies where the body shows the greatest response to a force input, others have considered the variables of transmissibility, energy absorption (or absorbed power), apparent mass, and impedance to be more indicative of how the body will respond to a given vibration in a given context ( Lundström, Holmlund, & Lindberg, 1998; Matsumoto & Griffin, 1998; Paddan & Griffin, 1998). In general, this latter group of measures bases analyses on empirical measurements of the motion input as well as the kinematics of the resulting body motion, thus accounting for any filtering-type effects that the body has on force input. ...
Among the most significant challenges to implementing U.S. Army future force concepts are persistent human factors issues associated with staffing ground vehicles that are equipped with advanced capabilities including intelligent automation. This review is particularly concerned with understanding the influence of vehicle motion on the ability of Soldiers to perform goal-directed behaviors in future military vehicles. Because vehicle motion is a primary influence on the Soldier's performance, understanding the relationship between vehicle motion and performance is considered essential to solving the human factors problems brought about by implementation of advanced technologies in modern tactical vehicles. The review is organized in three main sections. First, a conceptual framework, alternately known as a "systems perspective", is introduced as a way to analyze the problem of Soldier-vehicle performance in terms of delineating the constraints that influence goal-directed behavior within the military context. Second, this framework is then used to structure an overview of research on whole-body motion and human performance, with a particular emphasis on relationships that have most frequently been identified in empirical studies. In the third and final section, the available information is applied to the military context in specific reference to lessons learned from the formal studies, field tests, and demonstrations that have been conducted with experimental platforms such as the Bradley infantry fighting vehicle and the crew integration and automation test bed (CAT). Overall, the extant literature taken in the context of direct observations in military platforms leaves little doubt that occupation of moving vehicles will result in detriments to performance of essential tasks for vehicle control as well as other essential command and control functions such as target acquisition, route planning, and teleoperation of remote assets.