Vibration Treatment Research Articles

Biophysical and nutritional combination treatment for myosteatosis in patients with sarcopenia: a study protocol for single-blinded randomised controlled trial

IntroductionSarcopenia is characterised by age-related loss of skeletal muscle and function and is associated with risks of adverse outcomes. The prevalence of sarcopenia increases due to ageing population and effective...

Double vibratory stress relief treatment of welded pipes as an alternative to heat stress relief treatment: Effects on hardness, Charpy impact energy and CTOD

This work analyzes the effects of intermittent resonant vibration treatment in pipes welded to connectors applied in the field of oil and gas wells. The vibratory stress relief (VSR) process was applied intermittently under two conditions: the first one, called Simple Vibration Treatment (TVS), which consisted of a resonant vibration treatment with the vibrational system at the mean length of the product, a second step, with the product being rotated 90°. The results obtained with this process led us to study a new resonant vibration process with the purpose of intensifying the previous one, taking care that no defects would be introduced into the product. This condition, called Double Vibration Treatment (TVD), consisted of a treatment formed of three steps: the first two steps were performed in the same way and with the same procedure used in the Single Vibration Process (TVS). The third step consisted of carrying out a second resonant vibratory treatment with the vibrator positioned on the longitudinal weld of the pipe, close to the circumferential weld of the pipe with the connector. These VSR treatments were compared with the stress relief heat treatment PWHT (Post Weld Heat Treatment) which is normally used after welding the connectors to the pipe. The resonant vibration treatments (VSR), did not introducing any damage to the product, presented reduced treatment time, and tended to positively affect the evaluated mechanical properties, exceeding or equaling the same tendency presented by the heat treatment. The resonant Doble Vibration Treatment (TVD) showed the best results, affecting the evaluated properties more positively than the TVS, which practically promoted the same trend of results produced by PWHT. The studies were characterized by Vickers hardness tests, Charpy V impact fracture tests and CTOD fracture toughness tests, and the results were analyzed using ANOVA statistical modeling.

Analyzing the possibilities of generating the reciprocating motion and plane oscillations of a working member of a vibratory lapping-polishing machine

Vibratory treatment is widely used in various industries for performing finishing technological operations, e.g., lapping, polishing, glazing, strengthening (hardening), etc. The problems of maximizing the treatment accuracy and performance of vibratory technological equipment provide the necessity of optimizing the motion trajectory (path) of the corresponding working member. The main purpose of these investigations is to substantiate the possibilities of generating the translational (reciprocating) motion and plane (plane-parallel) oscillations of the working members of vibratory lapping-polishing machines. The research methodology consists of the following stages: substantiating the ideas of improving the vibratory lapping-polishing machines; designing the dynamic diagrams of the machines’ oscillatory systems; developing the mathematical models to describe their dynamic behavior; numerical modeling of the machines’ motion conditions. The obtained results present the possible motion trajectories (paths) of the working member (lap, polisher, grazer, etc.). The main scientific novelty of these investigations is substantiating the idea and possibilities of implementing various motion conditions of the working member for adjusting the vibratory lapping-polishing machine in accordance with the technological requirements, as well as for increasing the wear-out period and durability (normal operating period) of the working member. The obtained results can be used for improving the performance and accuracy of similar vibratory lapping-polishing machines.

Microplastic deformation activating residual stress relief for Al alloy

Thermal-vibratory technique has been demonstrated to effectively and rapidly reduce residual stress and improve mechanical properties of materials. But the underlying residual stress relief mechanism remains unclear, limiting the development and application of the technique. In this work, the relationship between residual stress and microstructure evolution during thermal-vibratory process in 7085 Al alloy is systematically investigated, using a combination of experiments, molecular dynamic (MD) simulations, and artificial neural network (ANN). Experimental results show that increasing the thermal-vibratory temperature improves the residual stress relief rate and triggers the uniform distribution of dislocations owing to temperature-enhanced dislocations activity. At the atomic scale, the MD simulation also observed an increasing tendency in residual stress relief rate with increasing temperature. Moreover, MD simulations further reveal that the high shear strain around grain boundaries triggers dislocation motion, accompanied with the decrease of residual stress in the grain interior. That means the residual stress relief is controlled by the dislocation activation around grain boundaries, and the residual stress is relieved only when the material undergoes plastic deformation. Based on the ANN, a map of the residual stress relief rate versus the initial residual stress, thermal-vibratory amplitude, and temperature is constructed, to guide the optimal thermal-vibratory process. These results provide fundamental knowledge and method to determine the residual stress after thermal vibratory treatment, and can further realize the precise control of shape and properties of materials during manufacturing.

Effect of kinesio taping in combination with vibration treatment on college students' delayed-onset muscle soreness.

Objective: Kinesio taping (KT) and vibration treatment (VT) can alleviate delayed-onset muscle soreness (DOMS) to some extent. However, the literature reports on the difference between the two treatments, and whether a joint intervention (JI) works better than single treatments remains unknown. This study compares the effects of KT, VT and JI on DOMS in college students. Methods: A total of 88 college students were randomly divided into the KT (KTG, n = 21), VT (VTG, n = 22), JI (JIG, n = 23) and control (CG, n = 22) groups. All subjects underwent DOMS moulding. The baseline; immediate and 24, 48 and 72h visual analogue scale (VAS) scores and knee extensor maximum isometric voluntary contraction (MIVC) were determined. Results: The intergroup comparison showed the following results. 1) The VAS scores of the four groups peaked at 24h and gradually decreased. The immediate, 24h and 48h VAS scores followed the order: JIG > KTG and VTG > CG. The 72h VAS score followed the order: KTG < VTG < JIG < CG. 2) The knee extension MIVC in the four groups was lowest at 24h and then gradually increased. JIG had larger immediate MIVC than CG. KTG, VTG and JIG had larger 24h MIVC than CG. JIG had larger 48h MIVC than KTG and CG. Conclusion: KT and VT can reduce muscle pain and strength loss caused by DOMS to varying degrees. VT is better than KT in improving pain. The combined intervention worked better than single interventions.

Effects of Intensive Vibratory Treatment with a Robotic System on the Recovery of Sensation and Function in Patients with Subacute and Chronic Stroke: A Non-Randomized Clinical Trial.

Background: Sensory–motor deficits are frequent and affect the functionality after stroke. The use of robotic systems to improve functionality and motor performance is advisable; therefore, the aim of the present study was to evaluate the effects of intensive, high-frequency vibration treatment administered with a robotic system in subacute and chronic stroke patients in terms of upper limb sensitivity, motor function, quantity and quality of movement, and quality of life. Methods: A simple-blind, non-randomized controlled trial was conducted. The control group received conventional rehabilitation treatment and the experimental group received robotic treatment with an Amadeo® robot in addition to their conventional rehabilitation sessions. Results: Intragroup analysis identified significant improvements in the experimental group in hand (p = 0.012), arm (p = 0.018), and shoulder (p = 0.027) sensitivity, as well as in motor function (FMA-UEmotor function, p = 0.028), integration of the affected limb (MAL-14amount scale, p = 0.011; MAL-14How well scale, p = 0.008), and perceived quality of life (SIS-16, p = 0.008). The measures between the control and experimental groups showed statistically significant differences in motor performance and spontaneous use of the affected limb (MAL-14amount scale, p = 0.021; MAL-14How well scale, p = 0.037). Conclusions: Intensive, high-frequency vibration with a robotic system, in combination with conventional intervention, improves the recovery of upper limb function in terms of quantity and quality of movement in patients with subacute and chronic stroke.

Clinical Evidence of Vestibular Dysregulation in Colicky Babies Before and After Chiropractic Treatment vs. Non-colicky Babies.

Background: To date, after 65 years of research that was primarily directed at differentiating between normal and colicky crying, the cause of infantile colic remains elusive and no definitive cure has been found. Given the general absence of pathology, colicky crying is widely considered the extreme end of a spectrum of normal crying behavior. However, evidence gleaned from scattered sources throughout the literature suggests that infantile colic may be the behavioral expression of physiological brainstem dysregulation, particularly of the vestibular and autonomic systems. The purpose of this study is to present a five-point clinical index of vestibular (hyper) activity and its application to investigate vestibular dysregulation in colicky and non-colicky babies.Methods: One hundred and twenty consecutive colicky babies were evaluated using this index, before and after a very gentle vibratory treatment, and compared to 117 non-colicky babies.Results: Before treatment, of 120 colicky babies only 2 (1.7%) scored 0, whereas 118 (98.3%) scored 1–5. Of 117 non-colicky babies 89 (76.1%) scored 0 and 28 (23.9%) scored 1–3, none scored 4–5. The odds ratio is OR (CI 95%) 187.54 (43.52–808.09). After treatment 111 (92.5%) scored 0 and 9 (7.5%) scored 1–3, none scored 4–5. A McNemar test showed the difference before and after to be significant (χ2 = 109.00, p < 0.001). For colicky babies the mean vestibular score is 2.88 (SD 1.22), compared to 0.37 (SD 0.73) for non-colicky babies, a difference of 87.2%. After treatment the score decreased from 2.88 (SD 1.12) to 0.10 (SD 0.40), or 96.5%.Conclusion: Colicky babies are not just infants who cry a lot. They also show clinical evidence of vestibular dysregulation. Treatment aimed at relaxing tight sub-occipital musculature by means of gentle vibrational stimulation may be effective in decreasing vestibular hyperactivity, signifying an improvement in brainstem regulation. The vestibular index opens the prospect for development into a tool toward an objective and practical clinical diagnosis of infantile colic.

Localized muscle vibration in the treatment of motor impairment and spasticity in post-stroke patients: a systematic review.

During the last decades, many studies have been carried out to understand the possible positive effects of vibration therapy in post-stroke rehabilitation. In particular, the use of localized muscle vibration (LMV) seems to have promising results. The aim of this systematic review was to describe the use of LMV in post-stroke patients to improve motor recovery, reducing spasticity and disability in both upper and lower limb. A search was conducted on PubMed, Scopus, Pedro and REHABDATA electronic database. Only randomized controlled trials have been included, excluding no-localized vibratory treatments and other pathological conditions. Fourteen studies met the inclusion criteria and were included in this review. Collectively, the studies involved 425 stroke patients. Most studies included chronic stroke patients (ten) and treated only the upper limb (eleven). There is evidence that LMV therapy is effective in reducing spasticity and improving motor recovery, especially when associated with conventional physical therapy. LMV may be a feasible and safe tool to be integrated into traditional and conventional neurorehabilitation programs for post-stroke patients to reduce spasticity. Analysis of the available clinical trials do not allow us to indicate vibration therapy as effective in functional motor recovery, despite some studies showed encouraging results. Further studies, with larger size of homogeneous patients and with a shared methodology are needed to produce more reliable data, especially on the lower limb.

Current therapeutic strategies for erectile function recovery after radical prostatectomy – literature review and meta-analysis

Current therapeutic strategies for erectile function recovery after radical prostatectomy – literature review and meta-analysis

Experimental Investigation of Vibration Stress Relief of A106 Steel Pipe T-Welded Fittings

This research examines the use of vibratory treatments to reduce residual stresses in small welded parts. In this experimental investigation, a post weld vibration treatment was applied to T- A106 steel pipe fitting specimens to study the effect of the treatment on the residual stress and the hardness of the material. The vibratory stress relief treatment was carried out at different vibration frequency. The results have demonstrated that post-weld vibratory stress relief of small size fittings is possible and residual stress may be relieved, and the treatment may be an alternative method for heat treatment especially when unchange in dimensions and material stability are required.&#x0D;

Enhanced Fatigue Behavior in Quenched and Tempered High-Strength Steel by Means of Double Surface Treatments

The aim of this study is to maximize the fatigue life of a high-strength steel. For this purpose, two different kinds of double surface treatments were studied: shot peening plus vibratory finishing and shot peening plus grit blasting. First, a high-intensity peening treatment was applied, with the aim of inducing a deep region submitted to high compressive residual stresses, and a second surface treatment was followed, to reduce the roughness induced in the first treatment and mitigate the damage produced on the specimen surface. The use of such double treatments was demonstrated to be a good choice to achieve high surface hardening and deep compressive residual stress profiles and to minimize surface defects. The fatigue life of the steel was greatly enhanced following the application of both double surface treatments. A vibratory treatment applied for 24 h after the application of a previous shot peening treatment was able to increase the average fatigue life of the single shot-peened samples almost sevenfold, but a much greater fatigue enhancement was produced using grit blasting for only 60 s. Anyway, both second treatments are able to remove the damaged surface layer produced in the first high-intensity shot peening treatment. The obtained results also revealed that an appropriate combination of surface treatments (shot peening + secondary treatment) avoided the initiation of cracks at the surface of the specimens under cyclic bending loads. Instead, crack initiation took place beneath the compressive residual stress field, induced in alumina inclusions that acted as stress concentrators.

Investigation on the effect of mechanical vibration in mild steel weld pool

This study presents a new concept of a vibratory welding setup which can transfer the mechanical vibrations in the weld zone during Shielded Metal Arc welding (SMAW) process and can also produce the resonance frequency of 300 Hz. In the present investigation mild steel plates of 6 mm thickness has been butt welded using both conventional and vibratory welding conditions. Microstructure and the mechanical properties of the butt welded joints were evaluated, and the results were compared. Further, in order to optimize the process parameters of vibratory welding technique Taguchi and analysis of variance (ANOVA) technique have been adopted. The responses considered for analysis are hardness, ultimate tensile strength (UTS) and impact strength. The result of the study indicates that by applying the vibratory treatment during welding process the mechanical properties such as hardness, tensile strength and impact strength have been enhanced. Lastly, the obtained results are correlated from the results in the past researches.

Vibratory treatment of a particularly brittle mineral material

Vibratory treatment of a particularly brittle mineral material

Modeling and Simulation Technology of High Frequency Vibratory Stress Relief Treatment for Complex Thin -Walled Workpiece

The current research based on vibratory stress relief (VSR) is focused on low frequency excitation, but it is seldom mentioned for complex thin-walled workpiece with higher natural frequency. In this paper, the mechanism of high frequency VSR is studied by microdynamic theory. Aiming at the rotating frame of complex thin-walled workpiece in aerospace equipment, the high frequency VSR numerical simulation is carried out by finite element software Abaqus, the modal analysis technology and harmonic response analysis technology are proposed, and the exciting force, excitation frequency and other important parameters are determined. The simulation results are analyzed to verify the superiority of high frequency VSR to eliminate residual stresses of complex thin-walled workpieces, and provide a theoretical basis for optimal selection of excitation parameters for high frequency VSR.

Focal Muscle Vibration and Physical Exercise in Postmastectomy Recovery: An Explorative Study.

Background. Physical activity initiation and maintenance are particular challenges in the postmastectomy recovery and in particular Dragon Boat racing seems to be a useful sport activity. The aim of this study was to evaluate the role of focal muscle vibration as a proprioceptive input to improve upper limb functioning in a group of “paddlers” patients. Methods. A group of paddlers has been evaluated before vibratory treatment (T0), immediately after therapy (T1), after one week (T2), and after one month (T3) with DASH questionnaire, Body Image Scale, McGill pain questionnaire, Constant Scale, and Short Form 36 questionnaire. Results. Fourteen patients showed a significant reduction in disability score (p = 0,001) using DASH scale, an improvement of upper limb function (p = 0,001) using the Constant scale, and a reduction of pain (p = 0,007) at the McGill pain questionnaire. The Mental Composite Score of the Short Form 36 questionnaire showed significant results (p = 0,04) while no significant results had been found regarding the physical mental score (p = 0,08). Conclusion. Focal muscle vibration may be a useful treatment in a postmastectomy recovery of upper limb functionality.

CARBIDE SYNTHESIS AS A RESULT OF TITANIUM MECHANICAL ACTIVATION IN CONJUNCTION WITH VARIOUS CARBON COMPONENTS

It was established that structure modifications of carbon, received resulting from pyrolysis plant material and ash of natural graphite are the limiting factors when implementing the mechanochemical synthesis of titanium carbide in a vibratory treatment. The shown prospects of using natural graphite and modifications of the structure amorphous carbon, made from vegetable raw materials for the synthesis of titanium carbide with a minimum sulfur content. Ill. 6. Ref. 12. Tab. 1.

Effect of different forming processes on the mechanical performance of metal rubber

Metal rubber (MR) has become one of the most popular technologies in many applications including seals, heat shields, filters, gaskets, aircraft engine mounts, and vibration absorbers. Stability of mechanical parameters such as size, stiffness, and damping is required to ensure a reliable product. In the present study, effect of different forming processes on the mechanical properties of MR element is investigated, using vibratory loads and heat treatment approaches for residual stress relaxation. Hysteresis loops and real-time stiffness during each process are measured. Height and static stiffness are also investigated during aging treatment. Dynamic stiffness and damping of all manufactured MR elements is tested based on a dynamic test apparatus. The results show that hysteresis loops become stable after several loading and unloading cycles. Moreover, the combined residual stress relaxation method provides stable size and static stiffness. After residual stress relief treatment, MR maintains the stability of the dynamic properties to some extent.

Improving the Performance of Vibratory Treatment Based on Polymeric Composite Binder

Improving the Performance of Vibratory Treatment Based on Polymeric Composite Binder

Short-term effect of local muscle vibration treatment versus sham therapy on upper limb in chronic post-stroke patients: a randomized controlled trial.

In recent years, local muscle vibration received considerable attention as a useful method for muscle stimulation in clinical therapy. Some studies described specific vibration training protocol, and few of them were conducted on post-stroke patients. Therefore there is a general uncertainty regarding the vibrations protocol. The aim of this study was to evaluate the effects of local muscle high frequency mechano-acoustic vibratory treatment on grip muscle strength, muscle tonus, disability and pain in post-stroke individuals with upper limb spasticity. Single-blind randomized controlled trial. Outpatient rehabilitation center. Thirty-two chronic poststroke patients with upper-limb spasticity: 21 males, 11 females, mean age 61.59 years ±15.50, time passed from stroke 37.78±17.72 months. The protocol treatment consisted of the application of local muscle vibration, set to a frequency of 300 Hz, for 30 minutes 3 times per week, for 12 sessions, applied to the skin covering the venter of triceps brachii and extensor carpi radialis longus and brevis muscles during voluntary isometric contraction. All participants were randomized in two groups: group A treated with vibration protocol; group B with sham therapy. All participants were evaluated before and after 4-week treatment with Hand Grip Strength Test, Modified Ashworth Scale, QuickDASH score, FIM scale, Fugl-Meyer Assessment, Jebsen-Taylor Hand Function Test and Verbal Numerical Rating Scale of pain. Outcomes between groups was compared using a repeated-measures ANOVA. Over 4 weeks, the values recorded in group A when compared to group B demonstrated statistically significant improvement in grip muscle strength, pain and quality of life and decrease of spasticity; P-values were <0.05 in all tested parameters. Rehabilitation treatment with local muscle high frequency (300 Hz) vibration for 30 minutes, 3 times a week for 4 weeks, could significantly improve muscle strength and decrease muscle tonus, disability and pain in upper limb of hemiplegic post-stroke patients. Local muscle vibration treatment might be an additional and safe tool in the management of chronic poststroke patients, granted its high therapeutic efficiency, limited cost and short and repeatable protocol of use.

Optimization of process parameters during vibratory welding technique using Taguchi's analysis

Summary With an aim to improve the mechanical properties of a weld joint, a new concept of vibratory setup has been designed which is capable to stir the molten weld pool before it solidifies during shielded metal arc welding (SMAW) operation. Mechanical vibration having resonance frequency of 300 Hz and amplitude of 0.5 mm was transferred to the molten weld pool of 6 mm thick mild steel butt-welded joints during the welding operation. The experimental work was conducted at various ranges of frequencies, welding current and welding speed. Taguchi's analysis technique has been applied to optimize the process parameters; the response values for analysis are yield strength and micro-hardness. The test results showed that with the application of the vibratory treatment the values of hardness and tensile properties increased. The auxiliary vibrations induced into the weld pool resulted in increased micro-hardness of the weld metal which indicates the orientation of the crystal and refinement of grains took place. This study shows that vibration applied into the weld pool can be successfully improved the mechanical properties of welded joints. Thus this research attempt provided an alternative welding technique for grain refinement of weldments.