『Calculation method for traffic flow』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. What does traffic flow pcu mean?
pcu/h * 24=vehicles/day (pcu/h) Converted to (vehicles/day), the calculation process is as follows: pcu/h represents the number of vehicles passing through a certain highway point in one hour. The formula for traffic flow is: traffic flow=number of passing vehicles/time. Assuming traffic flow=10pcu/h, since there are 24 hours in a day, the daily traffic flow is 10 * 24 vehicles/day=240 vehicles/day. 1. Video detection technology is a non-contact passive detection technology based on video image vehicle detection and model recognition technology. This method can track the behavior process of vehicles by analyzing continuous video images, and capture speeding vehicles by analyzing and controlling photos.
2、 Magnetic detection technology utilizes ferromagnetic materials to alter the properties of the surrounding magnetic field in order to detect complete vehicle signals in the background of the geomagnetic field. A typical detection technique is geomagnetic detection technology. Its working principle is to lay a coil under the highway in advance and apply high-frequency current. When a vehicle passes through from above, due to the fact that most of the vehicles are made of metal, a disaster current will be generated inside the coil, reducing the inductance of the coil and obtaining traffic flow signals.
2、 Radar detection technology is the earliest technology used to detect vehicle speed, and the detection equipment is called radar speedometer or Doppler radar. The principle is to emit radio waves of a certain frequency to a moving object such as a vehicle, and detect the difference in the frequency of the reflected radio waves emitted by the object. This differen
4、 The method of using wireless sensor network technology and habit detection devices is different. Many scholars have proposed combining wireless sensor network technology with intelligent transportation, utilizing the characteristics of small sensor node size, reducing the cost of installation and maintenance, and forming a wireless traffic information collection network. The wireless traffic information collection network consists of wireless traffic information collection nodes, wireless information aggregation nodes, and monitoring hosts. The information collection nodes are deployed on the roadside to collect signals from the observation area, process the original signals, extract vehicle information, and transmit traffic information through the wireless network.
5、 The basic principle of ultrasonic testing technology for speed measurement and distance measurement is to use its reflection characteristics. The ultrasonic generator emits ultrasonic waves of a certain frequency and generates reflected waves when encountering obstacles. The ultrasonic receiver receives the reflected wave signal and converts it into an electrical signal. The time interval between the emitted wave and the echo is measured, and the brightness distance is calculated according to the formula as the propagation speed of the ultrasonic fiber wave. Calculate the vehicles motion speed based on the ratio of the distance change to the time interval between two measurements. Ultrasonic detection classification technology is widely used on highways and be
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