IMPROVEMENT OF MACHINE EQUIPMENT FOR PRECISION PROCESSING OF PARTS IN FLOATING WORKSHOPS

2020 ◽  
Vol 3 ◽  
pp. 31-38
Author(s):  
A.O. KHARCHENKO ◽  
S.M. BRATAN ◽  
E.A. VLADETSKAYA
Keyword(s):  
Vibration Isolation ◽  
Precision Machining ◽  
Sea Waves ◽  
Machine Vibration ◽  
Vibration Resistance ◽  
Floating Base ◽  
Active Vibration ◽  
Precision Machine Tools ◽  
Effective Design ◽  
Harmful Effects

The article discusses the results of research and development in the direction of improving machine equipment for precision machining of parts in the conditions of floating workshops by increasing the vibration resistance of the technological system and reducing the harmful effects of the external environment (sea waves) and neighboring operating equipment The traditional vibration–isolating supports of the machines cannot be used at floating workshops due to their loss of functioning under the rolling pitch of the floating base and horizontal displacements under its influence. New effective design variants of the vibration protection device of precision machine tools and supports with active vibration isolation are described, which allow automatic control of the damping of the machine vibration–isolating support under external influences.

scholarly journals Analysis of vibration resistance of machining technological equipment of a floating workshop in shipbuilding

2021 ◽  
pp. 15-22
Author(s):  
О.В. Владецкий ◽  
Е.В. Хекерт ◽  
Е.А. Владецкая ◽  
А.О. Харченко
Keyword(s):  
Machine Tool ◽  
Vibration Isolation ◽  
Vibration Damping ◽  
Sea Waves ◽  
Internal Factors ◽  
Vibration Resistance ◽  
Floating Base ◽  
Analysis And Synthesis ◽  
Isolation Systems

В статье рассмотрены результаты исследований в направлении совершенствования станочного оборудования для высокоточной обработки деталей в условиях плавучих мастерских путем повышения виброустойчивости технологической системы и снижения вредных воздействий от внешней среды (морского волнения) и соседнего работающего оборудования. Проанализированы традиционные виброизолирующие опоры современных станков, которые невозможно использовать на плавучих мастерских по причине потери ими функционирования в условиях качки плавучего основания и горизонтальных смещений под ее воздействием. Разные способы установки обеспечивают различную степень чувствительности станка к колебаниям основания и возмущениям, действующим в станке. Целью работы является изыскание путей повышения эффективности систем виброизоляции станочного оборудования в условиях плавучей мастерской для обеспечения качества обрабатываемых деталей. Задачей является анализ традиционных виброизолирующих устройств и разработка модели и алгоритма поиска новых структурных вариантов виброизолирующих устройств для уменьшения влияния вибрационных воздействий от внешней среды и внутренних факторов на качество обработки. Выявлено, что на этапах анализа и синтеза на уровне структурно-компоновочной оптимизации виброизолирующих устройств возможно по укрупненным качественным показателям получение рациональных структурных вариантов для шлифовальных станков плавучей мастерской. Установлено, что путем параметрического синтеза и проведения дополнительных теоретических и практических исследований реальных конструкций виброизолирующих устройств, возможно создание новых конструкций виброизолирующего устройства механообрабатывающего технологического оборудования. The article discusses the results of research in the direction of improving machine tool equipment for high-precision machining of parts in floating workshops by increasing the vibration resistance of the technological system and reducing the harmful effects of the environment (sea waves) and neighboring operating equipment. The traditional vibration-isolating supports of modern machines, which cannot be used in floating workshops, due to their loss of functioning under the conditions of the floating base swinging and horizontal displacements under its influence, are analyzed. Different installation methods provide different degrees of machine sensitivity to base vibrations and disturbances in the machine. The aim of the work is to find ways to improve the efficiency of vibration isolation systems for machine tool equipment in a floating workshop to ensure the quality of processed parts. The task is to analyze traditional vibration damping devices and develop a model and an algorithm for searching for new structural variants of vibration damping devices to reduce the influence of vibration effects from the external environment and internal factors on the quality of processing. It was revealed that at the stages of analysis and synthesis at the level of structural and layout optimization of vibration isolation devices, it is possible to obtain rational structural options for grinding machines of a floating workshop based on enlarged quality indicators. It has been established that by means of parametric synthesis and additional theoretical and practical research of real designs of vibration-isolating devices, it is possible to create new designs of vibration-isolating devices of mechanical processing equipment.

scholarly journals Tilt Active Vibration Isolation Using Vertical Pendulum and Piezoelectric Transducer with Parallel Controller

2021 ◽  
Vol 11 (10) ◽  
pp. 4526
Author(s):  
Lihua Wu ◽  
Yu Huang ◽  
Dequan Li
Keyword(s):  
Piezoelectric Transducer ◽  
Vibration Isolation ◽  
Vertical Vibration ◽  
Open Loop ◽  
Negative Effects ◽  
Voltage Controller ◽  
Hysteresis Nonlinearity ◽  
Passive Vibration Isolation ◽  
Active Vibration ◽  
Active Vibration Isolation

Tilt vibrations inevitably have negative effects on some precise engineering even after applying horizontal and vertical vibration isolations. It is difficult to adopt a traditional passive vibration isolation (PVI) scheme to realize tilt vibration isolation. In this paper, we present and develop a tilt active vibration isolation (AVI) device using a vertical pendulum (VP) tiltmeter and a piezoelectric transducer (PZT). The potential resolution of the VP is dependent on the mechanical thermal noise in the frequency bandwidth of about 0.0265 nrad, which need not be considered because it is far below the ground tilt of the laboratory. The tilt sensitivity of the device in an open-loop mode, investigated experimentally using a voltage controller, is found to be (1.63±0.11)×105 V/rad. To compensate for the hysteresis nonlinearity of the PZT, we experimentally established the multi-loop mathematical model of hysteresis, and designed a parallel controller consisting of both a hysteresis inverse model predictor and a digital proportional–integral–differential (PID) adjuster. Finally, the response of the device working in close-loop mode to the tilt vibration was tested experimentally, and the tilt AVI device showed a good vibration isolation performance, which can remarkably reduce the tilt vibration, for example, from 6.0131 μrad to below 0.0103 μrad.

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