Body Vibration Research Articles

Railway foreign body vibration signal detection based on wavelet analysis

Based on the wavelet packet analysis method with time-frequency analysis characteristics, the measurement signal of the vibration system is processed for noise reduction, the soft-hard threshold compromise wavelet denoising method used has the advantages of soft threshold and hard threshold denoising, and through the introduction of compromise factors, signal processing can be performed more flexibly in signal analysis. For the denoised signal, the fundamental wavelet time-energy spectrum analysis, the main components of the signal can be clearly displayed, and according to the distribution of its energy in each frequency band, the signal characteristics can be displayed intuitively. Experimental results show: It can be determined that there is a foreign body intrusion incident at a position 520 m away from the monitoring point, rather than a normal train travel incident. In fact, we are walking back and forth at a distance of about 520 m from the monitoring point, simulating the intrusion of illegal foreign objects such as pedestrians and livestock beside the railroad tracks prove that analysis and judgment can be known, the wavelet analysis proposed by the author can realize the monitoring and judgment of some illegal foreign body intrusion incidents such as pedestrians and livestock.

Deletion of osteopontin or bone sialoprotein induces opposite bone responses to mechanical stimulation in mice

Osteopontin (OPN) and Bone Sialoprotein (BSP) are co-expressed in bone and display overlapping and complementary physiological properties. Both genes show a rapid expression response to mechanical stimulation. We used mice with single and double deletions (DKO) of BSP and OPN to assess the specificity of their roles in skeletal adaptation to loading. Two-month-old Wild-Type (WT), BSP knockout (BSP−/−), OPN−/− and DKO male mice were submitted to two mechanical stimulation regimen (n = 10 mice/group) respectively impacting trabecular bone (Hypergravity, HG) and cortical bone (Whole Body Vibration, WBV). HG increased trabecular bone volume (BV/TV) in WT femur through reduced resorption, and in BSP−/− mice femur and vertebra through increased bone formation. In contrast, HG increased the turnover of OPN−/− bone, resulting in reduced femur and vertebra BV/TV. HG did not affect DKO bones. Similarly, WBV increased cortical thickness in BSP−/− mice and decreased it in OPN−/−, without affecting structurally WT and DKO bone. Vibrated BSP−/− mice displayed increased endocortical bone formation with a drop in Sclerostin expression, and reduced periosteal osteoclasts with lower Rankl and Cathepsin K expression. In contrast, vibrated OPN−/− endocortical bone displayed decreased formation and increased osteoclast coverage. Therefore, under two regimen (HG and WBV) targeting distinct bone compartments, absence of OPN resulted in bone loss while lack of BSP induced bone gain, reflecting divergent structural adaptations. Strikingly, absence of both proteins led to a relative insensitivity to either mechanical challenge. Interplay between OPN and BSP thus appears as a key element of skeletal response to mechanical stimulation.

Whole Body Vibration Improves Brain and Musculoskeletal Health by Modulating the Expression of Tissue-Specific Markers: FNDC5 as a Key Regulator of Vibration Adaptations.

Whole body vibration (WBV) is well known to exert beneficial effects on multiple tissues, improving synaptic transmission, muscle mass, bone quality, and reducing anxiety and depressive behavior. However, the underlying molecular mechanisms are not yet fully understood, and organs and tissues may respond differently to the vibratory stimulus depending on multiple factors. Therefore, we investigated the WBV effects on the brain and musculoskeletal tissue of 4-month-old young mice, evaluating synaptic plasticity by electrophysiological recordings and tissue organization by histology and histomorphometric analysis. Specifically, WBV protocols were characterized by the same vibration frequency (45 Hz), but different in vibration exposure time (five series of 3 min for the B protocol and three series of 2 min and 30 s for the C protocol) and recovery time between two vibration sessions (1 min for the B protocol and 2 min and 30 s for the C protocol). In addition, immunohistochemistry was conducted to evaluate the expression of fibronectin type III domain-containing protein 5 (FNDC5), as well as that of tissue-specific markers, such as brain-derived neurotrophic factor (BDNF) in brain, myostatin in muscle and collagen I (COL-1) in bone. Our results suggest that the WBV effects depend closely on the type of protocol used and support the hypothesis that different organs or tissues have different susceptibility to vibration. Further studies will be needed to deepen our knowledge of physiological adaptations to vibration and develop customized WBV protocols to improve and preserve cognitive and motor functions.

Virtual reality versus whole body vibration on quadriceps muscle strength in children with thigh burn

Background: Burn is an injury caused by biological, chemical, electrical and physical agents with local and systemic repercussions. It is one of the most significant health problems throughout the world, leading to prolonged hospitalization and hence increased expense for the patients, their families and society. Today, the prognosis of patients with burn is dependent, apart from adequate treatment, upon the health-care system and health-care professionals, regarding not only survival, but also lifelong quality. Objective: this study was conducted to compare between the effect of virtual reality and whole body vibration as two methods of proprioceptive stimulation on quadriceps muscle strength in children with thigh burn. Subjects and procedures: forty children with unilateral thermal burn of the thigh ranged in age from six to twelve years participated in this study. They were divided randomly into two study groups I and II respectively. Study group I was treated by whole body vibration program in addition to conventional physical therapy program while the study group II was treated by a Wii-fit therapy program (as a form of virtual reality treatment program) in addition to the same conventional physical therapy program given to study group I.

Guard Your Heart Silently

In recent years, particular attention has been devoted to continuous electrocardiogram (ECG) waveform monitoring due to its numerous applications. However, existing solutions require users to be confined to particular locations, rely on dedicated and expensive hardware, or require active user participation. The constrained recording conditions prevent them from being deployed in many practical application scenarios. In view of this, we present VibCardiogram, a continuous and reliable design for estimating ECG waveform shape via ubiquitous wrist-worn wearables; it renders a personal ECG waveform shape estimating system with prolonged recording time accessible to a larger sector of the population. Instead of adding auxiliary sensors to wearables, VibCardiogram leverages the widely integrated motion sensor to characterize cardiac activities, and interpret them to generate an alternative signal that has the same waveform shape as the ECG signal. Specifically, VibCardiogram extracts the cardiogenic body vibrations from noisy sensor data. As the waveform variability and inconstant period hinder the segmentation of cardiac cycles, VibCardiogram extracts features and realizes accurate segmentation via machine learning. To parse cardiac activities from vibration signals, we build a deep-learning pipeline associating the encoder-decoder framework and Generative Adversarial Networks. With dedicated construction and training, it can estimate the ECG waveform accurately. Experiments with 20 participants show that VibCardiogram can achieve an average estimation error of 5.989% for waveform amplitude estimation, which is within the 10% margins regulated by the American National Standards Institute. Moreover, the promising results further confirm that VibCardiogram effectively extracts Heart Rate Variability features and supports downstream applications.

Whole Body Vibration And Blood Flow Restriction For Muscle Recovery Following Exercise-induced Muscle Damage

Whole Body Vibration And Blood Flow Restriction For Muscle Recovery Following Exercise-induced Muscle Damage

Fuzzy Dynamic Output Feedback Force Security Control for Hysteretic Leaf Spring Hydro-Suspension With Servo Valve Opening Predictive Management Under Deception Attack

This article addresses the hierarchical resilient event triggered sampled-data security control and valve opening management problem for networked hysteretic leaf spring hydro-suspension with asymmetric actuator under false injected deception attack. For the derived Takagi–Sugeno (T–S) fuzzy model employed to tackle hysteresis nonlinearity, a new full-order dynamic output feedback top control with improved error and threshold functions for resilient event triggered mechanism is proposed to generate the target force so as to suppress the body and tire vibration under limited suspension chatter space. For the asymmetric cylinder hydraulic actuator over actuated by multiple servo valves, optimal servo valve openings are dynamic regulated to track the target force with weight adaptive nonlinear model predictive lower control. Benefiting from saved communication resource while more sparsely generating piecewise target force, as well as precise regulation by reasonably allocating over actuated valve openings to produce required force, the obtained results indicating more comfortable ride performance and less tire dynamic loads within smaller suspension chatter space favorably demonstrate the effectiveness of the proposed control strategy.

Study of Performance of Incorporating Pneumatic Suspension System with the Hydraulic Actuator for Quarter Car and Using Controllers with Genetic Algorithm

Suspension systems are one of the main parts of the vehicle that provide the passenger comfort and stability, while it is difficult for conventional passive suspension systems to cope with the vibrations to which the vehicle is exposed. Air suspension systems have a dynamic character that allows good handling of the road and a comfortable ride, but in a certain area for this reason the stiffness of the air suspension must be flexibly changed. The air suspension has been developed with the inclusion of a hydraulic actuator to create an additional force that withstands the incoming vibration from the road. The pneumatic suspension system parameters, such as vertical acceleration, road holding, and vertical displacement, are improved continuously based on the controllers that have been used for nonlinear pneumatic suspension systems, fractional order proportional integral derivative (FOPID), and fuzzy logic control (FLC). The genetic algorithm is utilized to tune the controller's parameters to the nonlinear active pneumatic system's 3-DOF. A model's simulation outcomes with controllers improved the suspension performance. The proposed active pneumatic system and pneumatic suspension systems are compared when a vehicle is traveling at a speed of 72 km/h on an ISO level B road to test the ability and efficiency of the system to suppress body vibration to enhance safety and provide a comfortable ride on rough roads. According to simulation results, the improved suspension substantially lowers vertical vibrations and enhances road adaptability.

Vertical and Side-Alternating Whole Body Vibration Platform Parameters Influence Lower Extremity Blood Flow and Muscle Oxygenation

This study directly compared blood flow and oxygenation during six treatment parameters used with vertical and side alternating whole body vibration (WBV). Twenty-seven healthy adults were randomized into the vertical or side-alternating (vibration type) WBV group. Participants completed three WBV sessions a week apart, 5 sets of 1 min on/off, at 3 conditions (Vertical: 30 Hz and 4 mm, 40 Hz and 2 mm, 45 Hz and 4 mm; Side-alternating: 10 Hz and 4 mm, 18 Hz and 3 mm and 26 Hz and 2 mm). Blood flow velocity and popliteal artery diameter, muscle oxygenation, skin temperature, heart rate and blood pressure were assessed. Muscle oxygenation was significantly increased for all vibration frequencies and types following two minutes of WBV (14.78%, p = 0.02) and continued until immediately after the cessation of WBV (24.7%, p < 0.001). WBV also increased heart rate (23.9%, p < 0.001) and systolic blood pressure (8.9%, p < 0.001) regardless of frequency and vibration type. Side-alternating and vertical WBV increased muscle oxygenation and heart rate in healthy participants completing an isometric squat. Muscle oxygenation was not increased until the second vibration set indicating the amount of time spent on the platform may have a significant effect on increases in blood flow.

Enhancement of Vibration Energy Harvesting Performance by Omni-Directional INVELOX Wind Funnel: A Computational Study

An alternate renewable energy source, through a piezoelectric vibration energy harvester with a bluff splitter body, could lead to higher efficiency in energy harvesting, through vortex-induced vibration at a near-resonance condition at 20 m/s high wind speed. However, wind energy is not as popular as solar energy, as the main renewable energy source in Malaysia, due to the relatively low wind speed available in the country. The INVELOX machine, introduced in 2014, was one of the most recent systems used to harvest wind power by accelerating wind speed. This omni-directional wind funnel could capture wind from all directions and tunnel it through a convergent-divergent nozzle, where the coupled bluff splitter body and piezoelectric vibration energy harvester (PVEH) are located at its venturi throat, which could lead to an increase in wind speed to fulfil the task of VIV energy harvesting. The proposed modified design is found to achieve 2.7 times the wind speed amplification at the venturi, which outperformed previously proposed designs. To achieve the optimum wind speed of 20 m/s for the coupled bluff splitter body and the PVEH plate, a free-stream wind speed of 7.4 m/s is recommended. The integration of the PVEH plate and the wind funnel is expected to harvest maximum voltage output at 20.99 V or 4.96 V, with a maximum power output of 0.82mW at 20 m/s.

Two-degrees-of-freedom vortex-induced vibration of cylinders covered with hard marine fouling

Marine fouling quickly covers the submerged surfaces of the man-made structures and affects the flow regime around them. Many important studies have already been conducted on the Vortex-Induced Vibration (VIV) of bluff bodies, but the two-Degree-of-Freedom (2-DoF) VIV of marine-fouled cylinders has received no previous attention. The current towing tank experimental study tries to fill this gap in the context of mechanical sciences. A Poisson Cluster Process (PCP) is used to model aggregated spatial distributions of artificial marine fouling on test cylinders. The Reynolds number ranges between 6.4 × 103 and 5.2 × 104. The results show that in the fouling presence, the super-upper branch disappears from the 2-DoF VIV response of the cylinders. The maximum oscillation amplitudes in the in-line and cross-flow DoFs are reduced up to 37% and 50%, respectively, as compared to those of the smooth cylinder. Marine fouling moderately reduces the maximum lift force coefficient, whereas remarkably decreases the maximum drag force coefficient, the “lock-in” range, the lower branch length, and the reduced velocity (U∗) marking the beginning of the lower branch. The highest mitigation occurs with the most sparsely marine-fouled cylinder examined (33% coverage). The aforementioned fouling effects generally reduce as the fouling coverage ratio increases.

Assessment of semen quality of taxi drivers exposed to whole body vibration

Whole body vibration (WBV) is a recognized occupational hazard for many workers such as drivers and operators of heavy and light machinery and exposure to it is accompanied by physical and mental repercussions. Only the limited studies have been done on the effects of vibration exposure on reproductive indices, however vibration exposure has been indicated as being a hazardous agents with the potential of being able to directly affect the reproductive system. Considering the importance of infertility, the present study was conducted with the aim of investigating semen quality among taxi drivers in Tehran and determine the effect of exposure to WBV on sperm parameters. The study population consisted of 70 taxi drivers and 70 office employee who attended infertility clinics for diagnostic purposes in the past year. The participants had to meet the entry criteria of the study while also being willing to recruit. Data was collected in the form of demographic questionnaires and general health questionnaires as well as sperm analysis conducted in an infertility clinic according to standard laboratory guidelines. The 8-hour time-weighted average (TWA) exposure to of WBV in automobile was measured as per ISO 2631-1. The TWA exposure to WBV among the taxi drivers and office employees were 0.697 ± 0.13 m/s2 and 0.068 ± 0.09 m/s2 respectively (P < 0.05). A statistically significant difference in total sperm count, progressive motility, non-progressive motility and total motility was observed between the taxi drivers and the office employees (P < 0.05). According to the univariate analysis of variance, exposure to WBV had negative effect on sperm concentration, progressive motility and normal morphology (P > 0.05); moreover exposure to WBV resulted in the larger effect size (B) on sperm parameters than the demographic variables (P > 0.05). Being taxi drivers increase the chance of the decreased semen quality (P > 0.05). It is difficult to draw definitive conclusions regarding the effects of WBV while intervening factors exist, such as psychological stressors, quality of sleep, background issues as well as environmental factors such as chemical pollutants (heavy metals) or ergonomic factors (body posture and working while sitting down).

Body physiological responses of city bus drivers subjected to noise and vibration exposure in working environment

BackgroundThe city bus drivers have critical roles in public transport and are occupationally exposed to different environmental stressors. This study aimed to investigate body physiological responses of city bus drivers subjected to noise and vibration exposure while crossing city routes. MethodsThis cross-sectional study was conducted on 103 city bus drivers working in the governmental transportation system in Hamadan city. The subjects' exposures to noise and body vibration were measured during driving activities. Their blood pressure (BP), as well as heart rate (HR), were measured before and after driving. Multivariate regressions (MLR) were employed to analyze the effect size of the stimulus on body physiological responses using SPSS 22. ResultsExposure levels to noise, whole-body vibration (WBV), and hand-arm vibration among drivers were 79.50 ± 3.51dB, 0.620 ± 0.159 m/s2, and 0.438 ± 0.064 m/s2, respectively which were lower than the exposure limits. Heart rate as main physiological response before and after driving were 74.22 ± 4.11 and 79.23 ± 8.59 bpm, respectively. The developed MLR models statistically showed that noise exposure could only affect the HR (β = 0.193 and p < 0.001); while WBV exposure affected both BP (β = 0.360 and p < 0.001) and HR (β = 0.367 and p = 0.020). The statistical analysis represented that exposure to noise and vibration in the presence of other possible covariates have significant effects on body physiological responses. ConclusionThe study empirically confirmed the possibility of body physiological changes influenced by physical stimulus during real driving activities. It is highly recommended that occupational health surveillance should continuously be implemented to maintain and promote the safety and health of drivers throughout their careers.

Effects of Conventional Therapy on Quality Of Life in CMT Disease. Review and Meta-Analysis

Objectives: Up to now, only symptoms of Charcot-Marie-Tooth disease can be treated. This work investigates which therapy is the most effective in Quality of Life in Charcot-Marie-Tooth. Methods: A literature research was conducted (search terms “Whole Body Vibration” or “WBV” or “Exercise” or “Rehabilitation” and “Charcot Marie Tooth” or “CMT” or “Hereditary Neuropathy” or “HMSN”) in five online databases. Inclusion: Publications from January 1990 to April 2022. Exclusion: No conventional treatment or Charcot-Marie-Tooth. Methodological quality: assessed by PEDro score. Effect sizes: calculated by Standardized Mean Differences and 95 % Confidence Intervals. Results: Of the 5,941 publications found, 17 focused conventional treatment for Charcot-Marie-Tooth disease of whom four had a good quality and investigated Quality of Life. No study investigates Whole Body Vibration. There is no effect (SMD = .29) in health related Quality of Life, a low effect (SMD = -.42) in Activities of Daily Living favoring experimental groups and no effect (SMD = .13) in Disability favoring control groups. Conclusions: These interventions cannot improve Quality of Life in Charcot-Marie-Tooth. Since no studies investigated "Whole Body Vibration" in Charcot-Marie-Tooth, this should be done as well as a motor ability training program. Such studies are in planning.

Effect of Different Vibration Frequencies on Improving Sports Performance: A Review Article

Background and Aims Whole body vibration (WBV) is one of the relatively new interventions that is widely used in physiotherapy and sports physiotherapy. It is becoming more common due to its positive effects on the neuromuscular system. The WBV device produces oscillations and its intensity is determined based on the parameters of frequency, amplitude, and duration of vibration. According to the previous studies, some parameters of this device results in increased muscle activity, strength, and power. Muscle strength and power are the two most important factors in musculoskeletal efficiency. As a result, sports performance variables such as jump height and running speed are affected by WBV. According to previous studies, if the vibration is applied with appropriate parameters, it can be effective in improving the performance of individuals in activities such as jumping and running. Furthermore, it has been shown that frequency parameter is more important than other vibration parameters since it has a greater effect on musculoskeletal performance. As a result, this study aims to review the studies on the effects of various WBV frequencies on functional variables in sports activities. Methods A search was conducted in PubMed, Scopus, and Google Scholar databases to find studies about the effect of WBV frequencies on jumping and running. Results According to previous studies, the frequency of 30-50 Hz resulted in an immediate increase in countermovement jump and squat jump heights. The frequencies of 18-35 Hz and 40 Hz, when used for a long time, also increased the heights of countermovement and squat jumps, respectively. In a few studies, the 26 and 20-Hz frequencies improved the heights of horizontal, countermovement, and squat jumps. Moreover, 30-Hz frequency increased running speed and step length and reduced the running duration in a certain distance. The frequency of 45-Hz immediately reduced the step length and increased the step rate during running on a treadmill. Conclusion The 30-Hz frequency is the most common WBV frequency with a positive effect on jumping and running abilities. In both acute and chronic conditions, this frequency may have a positive impact on the kinetic and kinematic variables of jumping and running. As a result, this frequency is suggested for improving an individual's neuromuscular performance in sports activities.

Effects of whole body vibration in postmenopausal osteopenic women on bone mineral density, muscle strength, postural control and quality of life: the T-bone randomized trial

PurposeOsteopenia is common in postmenopausal women and effective interventions increasing or stabilizing bone mineral density (BMD) to prevent fractures are urgently needed.MethodsSixty-five postmenopausal women diagnosed with osteopenia (T-score between -1.0 and -2.5) were randomly assigned to either a vibration training group (VT), a resistance training group (RT), or a control group (CG). BMD T-score values (primary endpoint) were assessed at baseline (T0) and after 12 months (T12), secondary endpoints (muscle strength, postural control, and health-related quality of life) at baseline (T0), after 6 months (T6), after 12 months (T12), and as follow-up after 15 months (T15).ResultsAfter the intervention period, neither the VT nor the RT showed any significant changes in BMD T-score values compared to the CG. Isokinetic strength improved significantly within all training groups, with the exception of the flexors of VT at an angular velocity of 240°/s. Health-related quality of life as well as postural control improved significantly for the RT only.ConclusionsWe conclude that participants of all three groups were able to maintain their BMD. The improvements in quality of life and postural control after resistance training are nevertheless meaningful for postmenopausal osteopenic women and support the importance of regular loadings of the musculoskeletal system.This study was retrospectively registered in January 2022 at the DRKS (S00027816) as clinical trial.

A novel bagged tree ensemble regression method with multiple correlation coefficients to predict the train body vibrations using rail inspection data

Prediction of the train body vibrations induced by the train running is desirable and useful to ensure comfortable service, reliable, safe, and secure operation of railway systems. By using daily measurement data from GJ-5 rail detection vehicle, this paper presents a novel prediction algorithm, which is based on bagged tree ensemble regression with multiple correlation coefficients. To obtain the valuable data sets from a large amount of inspection data, an approach of multiple correlation coefficients is used for the data pre-processing. Then the prediction model of train body vibrations is established by combining regression tree algorithm and bagged ensemble algorithm. By training the valuable data sets, the prediction results are calculated by the bagged tree ensemble regression method. Finally, the proposed method is evaluated with experimental data and the traditional method. The experimental results show that the proposed method not only has higher accuracy but also can effectively reduce the number of the data sets, the accuracy is up to 98% and the number of valuable training data sets is reduced by 78.3%. The new method proposed in the paper can accurately predict the vibration status of the train body without installing any new sensors and other monitoring equipment on the train, which can reduce maintenance costs and prevent potential safety risks.

Interaction of two parallel free oscillating flat plates and VIV of an upstream circular cylinder in laminar flow

Flow-induced vibration of bluff bodies and especially circular cylinders have been always of great interest and flat plates are known as useful means for altering flow structure to the desired condition. This work aims to investigate the effect of two parallel downstream flat plates which are mounted in the wake of a circular cylinder. Different configurations including eight horizontal (0.5≤G ≤ 4) and two vertical gaps (H = 0.5, 1) are numerically simulated to focus on the near wake structure and FIV of objects. The results show that the response of parallel plates in the wake of a stationary cylinder depends on both their horizontal and vertical locations. Change in the vertical distance alters the vortex shedding suppression mechanism. While a smaller vertical distance leads to a larger horizontal non-oscillating range, it comes with a higher maximum vibration amplitude. In the case of simultaneous oscillation, all three objects vibrate in all horizontal distances for the smaller vertical gap. The vibration disappears for the larger gap due to weaker interaction between the plates and the shear layers for a range of horizontal distances. The higher vibration amplitude in simultaneous vibration shows the considerable potential of the current concept for developing an improved energy harvesting system.

Whole body vibration and drop jumps induces post-activation performance enhancement

PurposeMany studies have investigated the effect of whole body vibration (WBV) exercise on post-activation potentiation. It was reported that an intervention protocol of WBV combined with 5 drop jumps (DJs) led to an increase in twitch force, suggesting the occurrence of post-activation potentiation. The purpose of this study was to examine the acute effect of different warm-up interventions on countermovement jump (CMJ) performance by recording jump height, power, and take-off velocity in gymnasts.MethodsOverall, 10 adult gymnasts (mean age: 22.80 ± 1.75 years; body mass: 61.92 ± 8.65 kg; body height: 170.10 ± 8.65 cm) with 16.35 ± 5.68 years of training experience volunteered to participate in this study. The interventions were (i) WBV, (ii) no vibration, (iii) DJs, and (iv) WBV combined with DJs (WBVDJ). Over 4 distinct randomized testing sessions, the gymnasts performed pre-intervention tests comprising 3 CMJs, followed by one of the 4 interventions; after 8 min, they performed another set of 3 CMJs.ResultsA significant interaction was observed between interventions for jump height and take-off velocity, leading to improvements (+4.82%, &lt;i&gt;p&lt;/i&gt; &lt; 0.05; +2.50%, &lt;i&gt;p&lt;/i&gt; &lt; 0.05, respectively) after WBVDJ only. No significant improvements were noted for WBV, DJs, or no vibration interventions. The implementation of WBVDJ was an effective stimulus leading to post-activation performance enhancement of CMJ in gymnasts.ConclusionsThe WBVDJ intervention increased jump height of CMJ performance and take-off velocity of lower limbs. In addition, WBVDJ led to greater performance improvement compared with DJ intervention.

Whole body vibration during simulated flight via uncertain models and interval analysis

An uncertain mathematical model is developed to reproduce the human-body responses to a simulated flight-induced vibration. The objective is to create a predictive model based on the anthropometric characteristics of a seated human body that can turn useful for human-centered design considerations and for the integration of liveware into digital twin models. To this end, the human body is seen as an advanced vibrating structure represented as a dynamic stochastic 4DOF model with random anthropometric values. Experimental and numerical tests are given and results are evaluated in the time and frequency domain.