The influence of human interaction on the vibration of hand-held human-machine systems – The effect of body posture, feed force, and gripping forces on the vibration of hammer drills

Lindenmann, Andreas; Uhl, Michael; Gwosch, Thomas; Matthiesen, Sven

doi:10.1016/j.apergo.2021.103430

Cited by 16 publications

(9 citation statements)

References 25 publications

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“…In the case of rotational vibration excitation, Schröder et al (2022) also described a similar influence [34]. Hence, the observed effect of the applied gripping force on the RMI corresponds to the current literature [8,23,25,27,28,30,34,43,44].…”

Section: How Is the Rmi In Y H Direction Influenced By Gripping Forces?supporting

confidence: 74%

“…One option for validating these interactions is manual testing using sensor-equipped prototypes. However, manual tests are time consuming and offer only limited significance since the subject's mood and individual physical condition and behavior strongly influence the results [8]. Furthermore, the user's fatigue limits the number of possible test repetitions and the tests' reproducibility.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Coupling Forces and Body Posture on the Rotational Hand–Arm Impedance in yh Direction

2023

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This manuscript investigates the rotational mechanical impedance of the human hand–arm system with respect to vibration excitation around the gripping axis of the hand under the influence of body posture, gripping force, and push force. Knowledge of rotational mechanical impedance is required for deriving models of hand–arm biodynamics. These models are used in the validation of power tools to predict further vibrational human–machine interactions. In the current state of research, such models exist for translational but not rotational vibration excitation. Consequently, this study investigates the properties of a hand–arm system with respect to rotational vibration excitation. In the study, the rotational impedance of the hand–arm systems of 13 adults was measured at various gripping and push forces applied in different body postures. The setup of the test used in this study consisted of a shaker that applied rotational vibrations at certain frequencies to the subjects’ hand–arm systems via a cylindrical handle. The results of the study indicate a spring–damper dynamic of the hand–arm system. The gripping force strongly influences the magnitude of rotational impedance across the frequency spectrum. Regarding push force and posture, no corresponding influence could be determined. The results suggest that the frictional contact between the hand and handle might confer a damping effect.

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Section: How Is the Rmi In Y H Direction Influenced By Gripping Forces?supporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Influence of Coupling Forces and Body Posture on the Rotational Hand–Arm Impedance in yh Direction

2023

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“…Therefore, an important approach is that the design strategy of vibration control and reduction in each category should be different based on several influencing factors. 7 The overall mean of 16.65 m/s 2 (14.66-20.04) in this study can be compared to 15.09 m/s 2 reported for five electric and pneumatic demolition hammers in real conditions, a mean of 12.78 m/s 2 for pneumatic hammers in the laboratory environment, and an average of 19 m/s 2 in 27 and 40 kg heavy demolition hammers under actual operating conditions. 4,15,16 In the study of De Silva and Wijewardana, 45 the hand-arm vibration exposure values for the x, y, and z axes was reported to be 23.3, 15.2, and 18.1 m/s 2 , respectively.…”

Section: Discussionmentioning

confidence: 57%

“…Therefore, it should be noted that the values of other axes in the evaluation of exposure to these tools should never be ignored. However, in many studies, such as the study by Lindenmann et al, 7 only the evaluation was done in the vertical axis and the results of other axes were not even presented, which seems that it cannot be a correct approach in non-robotic and steady-state conditions, unless the accelerometer was attached on the instrument handle.…”

Section: Discussionmentioning

confidence: 99%

“…In the case of tools with percussive action, there is a kind of a mechanical system that can convert the rotational force of the motor into a hammer force with a very high and robust frequency. The power or speed of the operating mechanism of these tools, whether percussion or rotational, along with other effective factors such as grip force, 4–7 feed force, 2,7–9 bit wear, 10,11 bit diameter, 8,12–14 device weight, 4,15 power source, 15,16 and user arm posture 7,17 have considered in the magnitude of the vibration of the tools of the handle. The results of a study in a group of construction workers showed that jackhammering was pointed out to be a task that had the most significant damage to their health.…”

Section: Introductionmentioning

confidence: 99%

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Handle transmitted vibration of electrical demolition hammers: Frequency and magnitude investigation in field measurements from different bits

Monazzam

Khavanin

Sarrafzadeh

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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Using a demolition hammer among the power tools is one of the most challenging job tasks for the operators of these tools, which exposes users to high levels of hand-transmitted vibrations. The focus of this study was for finding the vibration levels transmitted to the handles, the frequency content transmitted by the tool, and the effect of using insert bits with different tip shapes and lengths using conventional demolition hammers under controlled operating conditions on typical concrete slabs in the field. Three demolition hammers (weighing between 14 and 27 kg) with two handles installed were subjected to simultaneous measurements based on ISO 5349 as the field measurement technique. The findings demonstrated that even while the vertical axis dominated, several samples also produced equivalent x-axis results. The impact energy of the tools employed and the transmitted vibration to the tool handles are not significantly correlated with each other. All mean values were higher in the slabs with a thickness of 15 than those with 10 cm. The mean values of the total results for the two forms of flat and point tip inserted bits were 16.85 and 15.86 m/s2, respectively, and in the samples with the same operating factors, this difference was more than 3 m/s2 ( p < .03). The a wrms ( frequency-weighted root mean square acceleration) produced at tools using 60 cm bits were more than those with a length of 40 cm, both for the average of the total results and the average of the results of each hammer. The difference between the average bit length groups over samples with the same factors reached 4.65 m/s2 ( p = .02). Frequency analysis for the flat and point insert bits with 60 cm length in the concrete slabs with a thickness of 15 cm showed that the dominant frequencies detected at lower frequencies for point bits. This difference is almost two frequency parts of 1/3 octave band.

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Wissen in der Produktentwicklung – Grundlagen

Matthiesen,

Zimmerer,

Pähler

et al. 2024

Konstruktionswissen Für Ingenieure

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The influence of human interaction on the vibration of hand-held human-machine systems – The effect of body posture, feed force, and gripping forces on the vibration of hammer drills

Cited by 16 publications

References 25 publications

Influence of Coupling Forces and Body Posture on the Rotational Hand–Arm Impedance in yh Direction

Influence of Coupling Forces and Body Posture on the Rotational Hand–Arm Impedance in yh Direction

Handle transmitted vibration of electrical demolition hammers: Frequency and magnitude investigation in field measurements from different bits

Wissen in der Produktentwicklung – Grundlagen

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