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#Covid-19: জুলাইয়ে মৃতের সংখ্যা চার লক্ষ, তবে কি লকডাউন !
May 5, 2021, 9:18pm
রাজ্য
দ্য কলাম ইন্ডিয়াঃ সারা দেশ জুড়ে প্রতিদিন সংক্রমণের হার বেড়েই চলেছে । বাড়ছে মৃতের সংখ্যাও । ভয়ে টেস্ট করাচ্ছেন না বহু আক্রান্ত । কমিউনিটি স্প্রেড করছে করোনা । এরই মধ্যে ভয়ংকর খবর জানাল দেশ বিদেশের বিভিন্ন গবেষণা সংস্থা । তাঁরা ইতিমধ্যেই যে রিপোর্ট দিচ্ছেন তার সারবত্তা হল - মে-জুনে নয়, জুন-জুলাইয়ে করোনায় আক্রান্ত হয়ে মৃতের সংখ্যা পৌঁছতে পারে ৪লক্ষের ঘরে ।
কোন সংস্থা কি জানাচ্ছে ?
ইন্ডিয়ান ইনস্টিটিউট অব সায়েন্সেস , বেঙ্গালুরুঃ - ১১ জুলাইয়ের মধ্যে দেশে কোভিডে মৃত্যুর সংখ্যা হবে ৪ লক্ষ ৪ হাজার।
ওয়াশিংটন বিশ্ববিদ্যালয়ঃ জুলাইয়ের শেষ হতে হতে মৃতের সংখ্যা পেরোতে পারে ১০ লক্ষেরও বেশি ।
দেশ-বিদেশের এই গবেষণাগুলিতে একটা বিষয় বারবার উঠে আসছে – লকডাউন বা মাস ভ্যাক্সিনেশন । কিংবা দুটোই । যেভাবেই হোক আগামী চার থেকে আট সপ্তাহের মধ্যে কোভিডের রাশ টানতে না পারলে ভয়ংকর বিপর্যয়ের সম্মুখীন হবে দেশ । ইতিমধ্যেই এখনও পর্যন্ত দেশব্যাপী মৃতের সংখ্যা ছাড়িয়েছে ২ লক্ষ ২৬ হাজারেরও বেশি ।
বিশ্বের সর্বকালীন কোভিডে ৫লক্ষ ৭৮ হাজারের কিছু বেশি মানুষের মৃত্যু হয়েছে আমেরিকায় । এ দেশেও যদি কেন্দ্রীয় মন্ত্রক নিয়ন্ত্রণ না করতে পারে । তবে ফল হবে ভয়ঙ্কর । এমনটাই দাবি করছেন দেশ-বিদেশের গবেষণা সংস্থাগুলি ।
Keywords : Covid-19, Reports, Death
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Shaft Balancing: An Overview of Dynamic Shaft Balancing Instructions
Shaft balancing is a critical process used to ensure that rotating machinery operates smoothly and efficiently by mitigating vibrations associated with unbalanced rotors. Utilizing advanced equipment like the Balanset-1A portable balancer and vibration analyzer, industries can effectively perform dynamic shaft balancing on various machinery including crushers, fans, and turbines.
Understanding Static vs. Dynamic Balancing
It's essential to distinguish between static and dynamic balancing. Static balance occurs when a rotor is at rest; the center of gravity is not aligned with the axis of rotation, causing a gravitational pull that brings the heavy side down. Corrections are made by adjusting mass on a single plane, commonly applied to narrow disk-shaped rotors.
In contrast, dynamic balance involves rotors in motion and requires a more comprehensive approach. Dynamic imbalance arises when mass is distributed unevenly across multiple planes. This dual-plane imbalance generates forces during operation, leading to vibrations. Dynamic balancing corrects these forces by adjusting weights across two or more planes, effectively neutralizing vibrations during the rotor's operation.
Dynamic Shaft Balancing Process
To successfully execute dynamic shaft balancing, the following steps are undertaken:
Initial Vibration Measurement
The procedure begins with the initial vibration measurement of the rotor mounted on the balancing machine. Vibration sensors are connected, and the rotor is activated to record baseline vibrations. This data serves as a reference to gauge the effectiveness of subsequent balancing efforts.
Calibration Weight Installation
The next step involves installing a calibration weight on one side of the rotor. This known weight is placed at a predetermined point, and the rotor is again started to measure any changes in vibration. The data collected provides insight into how much the calibration weight affects rotor dynamics.
Adjusting the Calibration Weight
After collecting initial data, the calibration weight is moved to another location on the rotor. Vibration changes are recorded, which helps in understanding how weight placement influences overall rotor stability.
Final Weight Installation and Balance Check
Using the measurements acquired, the vibration analyzer determines the necessary corrective weights to achieve balance. These weights are then installed at the designated locations indicated by the analyzer. Following this, the rotor is activated once more to verify successful balancing through reduced vibration levels.
Angle Measurement for Corrective Weight Installation
During the balancing process, accurately measuring angles is crucial for placing corrective weights. The angle is measured in the direction of the rotor??™s rotation, identifying the precise locations for corrective weight installations. If weight removal is required, the opposite position of the trial weight serves as a reference point for the corrective measure.
Importance of Two-Plane Dynamic Balancing
Two-plane dynamic balancing is especially vital for longer axles and complex rotors. By addressing imbalances across two planes, industries can prevent excessive wear and tear on components, reduce energy consumption, and prolong equipment lifespan.
Using the Balanset-1A for Dynamic Balancing
The Balanset-1A device is specifically designed for dynamic balancing, offering two-channel functionality that caters to multiple rotor types. Its versatility makes it invaluable across various industries. The device is not only user-friendly but also delivers accurate measurements that enhance the balancing process.
Key Applications of Shaft Balancing
Shaft balancing is crucial in numerous applications to maintain operational efficiency and safety. Common uses include:
Conclusion
Dynamic shaft balancing is an essential procedure that significantly impacts the performance of rotating machinery. By understanding the intricacies of static and dynamic balance and employing devices like the Balanset-1A, industries can effectively manage vibrations, enhance efficiency, and extend the service life of equipment. Properly balancing shafts not only reduces maintenance costs but also increases safety in operations, underscoring the importance of this practice in modern machinery maintenance.