Controllable pneumatic drill

A. D. Kostylev; K. K. Tupitsyn; E. N. Cherednikov; A. T. Karavaev

doi:10.1007/bf02499836

ROLE OF REPEATED TRAUMA BY PNEUMATIC DRILL IN PRODUCTION OF AMYOTROPHIC LATERAL SCLEROSIS

Archives of Neurology And Psychiatry ◽

10.1001/archneurpsyc.1949.02310140055005 ◽

1949 ◽

Vol 62 (2) ◽

pp. 178 ◽

Cited By ~ 16

Author(s):

BERNARD J. ALPERS

Keyword(s):

Amyotrophic Lateral Sclerosis ◽

Pneumatic Drill ◽

Lateral Sclerosis

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Toleration of Background Noises

Journal of Speech Language and Hearing Research ◽

10.1044/jshr.3403.679 ◽

1991 ◽

Vol 34 (3) ◽

pp. 679-685 ◽

Cited By ~ 86

Author(s):

Anna K. Nabelek ◽

Frances M. Tucker ◽

Tomasz R. Letowski

Keyword(s):

Hearing Aids ◽

Background Noise ◽

Hearing Aid ◽

Elderly Subjects ◽

Pneumatic Drill ◽

Full Time ◽

Hearing Aid Use ◽

Part Time ◽

Speech Spectrum ◽

Young Subjects

One of the frequently quoted reasons for the rejection of hearing aids is amplification of background noise. The relationship between hearing aid use and toleration of background noise was assessed. Four groups of elderly subjects (at least 65 years old) and one group of young subjects with normal hearing participated in the study. Each group consisted of 15 subjects. The young subjects and elderly subjects in one group with relatively good hearing were tested for comparison with the hearing-impaired subjects. Elderly subjects in the three remaining groups had acquired hearing losses and had been fitted with hearing aids. The subjects were assigned to three groups on the basis of hearing aid use: full-time users, part-time users, and nonusers. The amount of background noise tolerated when listening to speech was tested. The speech stimulus was a story read by a woman and set at an individually chosen most comfortable level. The maskers were a babble of voices, speech-spectrum noise, traffic noise, music, and the noise of a pneumatic drill. There was a significant interaction between groups and noises. The full-time users tolerated significantly higher levels of music and speech-spectrum noise than part-time users and nonusers. In addition, the full-time users, but not the part-time users, assessed themselves as less handicapped in everyday functions when they wore hearing aids than when they did not wear their hearing aids

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Vibration Behavior during Underground Drilling Based on an Innovative Measurement Method and the Application

Shock and Vibration ◽

10.1155/2021/6489298 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Peng Cheng ◽

Wenlong Zhang ◽

Wenzhou Li ◽

Jie He ◽

Youliang Feng

Keyword(s):

Measurement Method ◽

Pneumatic Drill ◽

Drilling Process ◽

Pressure Relief ◽

Drilling Depth ◽

Vibration Signals ◽

Different Depths ◽

The Impact ◽

Dynamic Phenomena ◽

Relief Effect

Pressure relief drilling is one of the most common techniques to reduce the impact of rock burst, but the useful dynamic phenomena in the drilling process are ignored due to the lack of corresponding technical methods. Based on the fact, an innovative measurement method for vibration signals during the drilling construction by pneumatic drill rig is presented in this study. The acquisition and analysis of vibration signals show that the vibration information can reflect the drilling depth, the amplitude of different depth can reflect the pressure, and the vibration events of different depths can reflect the pressure relief effect. The method proposed in the study is of great significance to the supervision of the relief work quantity, the disclosure of the pressure situation, and the evaluation of the pressure relief effect.

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