In recent years, as the world’s population has risen sharply, stampede has emerged in an endless stream. Whether it was the large stampede on the Bund in early 2015 in the early part of the year or the southern part of France that occurred last week because residents had mistaken firecrackers for the sound of firecrackers, trampled on a stampede that led to 41 injuries, and trampled accidents caused by crowded people are not uncommon. Especially in the holidays, people's sufficiency is not alarmist.
Recently, Japan has developed a new technology that may help prevent such stampede.
This technology was developed by Mitsubishi Electric, a subsidiary of Japan’s Mitsubishi Group, and the University of Tokyo’s Advanced Science and Technology Research Center (RCAST), a real-time system that can simulate the movement of people. The system can accurately and real-timely calculate the flow of people according to the information provided by the surveillance cameras installed in the vicinity of the event venues and venues, thereby avoiding the occurrence of stampede events.
The system comprehensively analyzes the data feedback from surveillance cameras to provide organizers with a crowding index and real-time forecasts.
At the same time, the high-speed human behavior model established by the Advanced Science and Technology Research Center of the University of Tokyo can simulate the walking trajectory of the crowd to determine the degree of mutual influence between the crowd or independent individuals. By using these methods to forecast the flow of people, the relevant data such as “crowdness†can be obtained and then presented to the organizer or insurance company in a heat map way. This helps the security personnel to identify problems in a timely manner and take Emergency measures to prevent people from getting clogged.
Mitsubishi Electric stated that the system is the world’s first real-time mobile system for simulating human flow, with an accuracy of 80%. The system has been put into practice for the first time in the 38th fireworks festival held in Tokyo last weekend.
Via newatlas
Recommended reading:
A company wants to solve traffic statistics
A single-phase VFD, also known as a variable frequency drive, is a specialized electronic device used for precise control and regulation of single-phase motors. Unlike three-phase motors that are commonly used in industrial applications, single-phase motors are predominantly found in residential and small-scale applications.
The primary function of a single-phase VFD is to control the frequency and voltage supplied to the single-phase motor, thereby enabling accurate regulation of motor speed. By adjusting the frequency and voltage output, the VFD allows for smooth and precise control over the motor's rotational speed. This feature is particularly useful in applications where speed control is required, such as in residential HVAC systems, small-scale machinery, and household appliances.
Energy efficiency is a significant advantage offered by single-phase VFDs. By adjusting the motor speed to match the load requirements, the VFD reduces energy wastage and improves overall energy efficiency. When the motor operates at a lower speed during periods of low demand, energy consumption is significantly reduced, resulting in energy savings and lower operating costs.
Motor protection is another important aspect addressed by single-phase VFDs. They incorporate various protective features, including overload protection, short circuit detection, and thermal protection, which help safeguard the motor against damage due to excessive current, voltage fluctuations, or overheating. This ensures reliable motor operation, prolongs the motor's lifespan, and reduces the risk of unexpected failures.
Harmonic filtering is also a critical consideration in single-phase VFD applications. When single-phase VFDs operate, they can introduce harmonics into the power supply, which may cause issues such as voltage distortions and interference with other electrical equipment. To mitigate these problems, single-phase VFDs often incorporate harmonic filtering techniques to suppress harmonics and ensure a clean and stable power supply, maintaining power quality and preventing damage to connected equipment.
Control algorithms play a significant role in single-phase VFD operation. These algorithms allow for precise control and adjustment of motor speed, ensuring smooth acceleration, deceleration, and accurate speed regulation. Advanced control algorithms enable efficient motor operation and enhance overall system performance.
In summary, single-phase VFDs provide precise control and regulation of single-phase motors in residential and small-scale applications. With their energy efficiency, motor protection features, harmonic filtering capabilities, and advanced control algorithms, single-phase VFDs enhance motor performance, reduce energy consumption, and ensure reliable operation in various residential and small-scale applications.
Three Phase Vfd,Ac Single Phase Gasoline Generator,220V Vfd,Ac Inverter
WuXi Spread Electrical Co.,LTD , https://www.vfdspread.com