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The actual resistance value is larger than the standard resistance value, which means that the circuit has unexpected resistance. If the actual resistance value is infinite, it means that the circuit is open circuited. Accidental resistance or disconnection occurs: First, poor contact of external components of electronic components, including power lines, signal lines, control lines and ground wire. For example, the copper wire in the wire is partially broken or broken completely; the wire plug or socket is loose, rusted or oxidized; the connecting bolt of the wire is loose, rusted, or is separated by the lacquer rubber and other debris. The second is the internal failure of electronic components, including various fuses, switches, relays, sensors, controllers, actuators, and so on. For example, loosening, corrosion, and oxidation of plug connectors inside the electronic components; breaking of circuit boards or connection lines; poor contact or open circuit due to oxidation, ablation, loosening, or catch-up of soldered joints or contacts; and aging and burning of electronic components. Loss, etc., cause resistance to increase or open circuit, etc.
The effect of unexpected resistance or open circuit: 1 In the power supply circuit before the use of electrical appliances, accidental resistance or open circuit causes the voltage on the appliance to drop or the voltage is zero. 2 Unexpected resistance or disconnection occurs in the ground circuit after the appliance, and the voltage on the appliance is also reduced or the voltage is zero. However, in a complex circuit, it is also possible to make the appliance serially connected to other circuits, causing its electrical equipment to malfunction. 3 Accidental resistance or open circuit in the signal circuit will cause the signal to weaken or no signal. 4 In the resistor circuit, unexpected resistance or open circuit will cause the current in the circuit to become smaller or no current passes. The voltage at both ends of the appliance will be reduced or zero, but at the unexpected resistance, it will generate heat and burn out the electrical components. 5 Unexpected resistance in the electromagnetic circuit will cause the current to decrease and cause the electromagnetic element to malfunction. In addition, some electromagnetic devices, there is a primary coil and a secondary coil, if the primary coil circuit generates unexpected resistance to the current drop, and the current in the secondary coil will rise and burn the secondary coil, such as the motor.
The actual resistance value is smaller than the standard resistance value. The actual resistance value is smaller than the standard resistance value, which means that the circuit has a short circuit.
The reason why the actual resistance value is smaller than the standard resistance value is as follows: a short circuit between the wire and the wire, a short circuit between the wire and the positive electrode of the power supply, and a short circuit between the wire and the ground.
For example, peat, silt, frozen soil and strong expansive soil are not used during the movement of the motor vehicle or the engine during vibration. The strong expansive soil must not be used. Secondly, after the plasticity index is determined to meet the technical requirements, the compactness corresponding to the corresponding requirements of the specification shall be followed. The CBR test is performed; finally, the CBR value determined by the test is compared with the minimum strength value required by the specification to determine whether the material of the earth field or the selected gravel yard can be used for construction and provide first-hand technology for the project. Reference materials.
Conclusion
The formulation of CBR standards and test methods has enabled the majority of highway engineering and technical personnel to follow rules and regulations in their actual work, and built the first line of defense for project quality, reducing the blindness in the construction process and playing a role in Efforts to do more with less; correct understanding of the connotation of the CBR load-bearing ratio, and in accordance with the strict requirements of technical regulations and specifications, can guarantee the strength and overall stability, durability, and strength of the road base layer, to resist overloaded vehicle operations and effectively improve project quality. The second line of defense has been built to extend the service life of highways; it is an eternal topic in the history of highway construction to lose no time in developing new technologies, new materials, and new processes, and to increase the CBR value of the roadbed or grassroots level.
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