Rated calculation force conversion
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1. Gravity g = mg
(vertically downward, g = 9.8m/s2 ≈ 10m / S2, the action point is at the center of gravity, applicable to the earth surface)
2. Hooke's law f = KX
{along the recovery deformation direction, K: stiffness coefficient (n / M), X: deformation variable (m)}
3. Sliding friction force F = μ FN
{opposite to the relative motion direction of the object, μ： Friction coefficient, FN: positive pressure (n)}
{rrrrrrr}
extended data:
different classification of force
1. According to the nature of force, it can be divided into gravity, universal gravitation, elastic force, friction force, molecular force, electromagnetic force, nuclear force, etc Note that gravity is not equal to gravity under all conditions Gravity does not point to the center of the earth under all conditions. Gravity is a component of the earth's gravitational force on an object, and the other component is a centripetal force. Only on the equator does gravity point to the center of the earth.)
According to the effect of force, it can be divided into tension, tension, pressure, supporting force, power, resistance, centripetal force, restoring force, etc According to the research object, it can be divided into external force and internal force According to the action mode of force, it can be divided into non-contact force (such as gravitation, electromagnetic force, etc.) and contact force (such as elastic force, friction force, etc.) There are four basic interactions (forces): gravitational interaction, electromagnetic interaction, strong interaction and weak interactionnature of force:
materiality: force is the effect of an object (matter, mass) on an object (matter, mass). When an object is subjected to a force, another object must exert this effect on it. Force cannot exist independently without an object
interactivity (interaction): the interaction between any two objects is always mutual, and the object exerting the force must also be the object under the force. As long as one body exerts a force on another, the stressed body in turn will surely add a force to the exerted body Generating conditions: the force is equal in size (the resultant force is zero, in a state of non directional static motion) or not equal, in the opposite direction, acting on two different objects, and acting on the same straight line. It can be summarized as: foreign body, equivalent, reverse, collinear. A pair of interaction forces must proce and disappear at the same time.)
Vectoriality: force is a vector, which has both magnitude and direction
simultaneity: the force proced and disappeared at the same time
independence: the effect of one force does not affect the effect of another
includes three elements: the size, direction and action point of the force. The accurate expression of the three elements of force by a directed line segment is called the diagram of force. The size is represented by the length of a scaled line segment, the direction is represented by an arrow, the point of action is represented by an arrow or the tail of an arrow, and the straight line along which the direction of a force follows is called the line of action of a force. The diagram of the force is used for the calculation of the force. When the judgment power is large, we must pay attention to the scale of the line segment, because even if one line segment is longer than another line segment, but the scale of the long line segment is also longer, the force represented by the short line segment is not necessarily smaller than that represented by the long line segment
the formula is t = 9549 * P / n
P is the rated (output) power of the motor, and the unit is kW.
denominator is the rated speed, and the unit is R / min.
P and N can be found directly from the motor nameplate.
the ability of double precision floating-point computing is commonly used to measure the scientific computing ability of CPU, that is, the ability to process 64 bit floating-point data
the processor supporting avx2 can perform 16 floating-point operations in one core and one clock cycle, Also known as 16flops
CPU power = number of cores x frequency of cores x 16flops
processors supporting avx512 can perform 32 floating-point operations in one core and one clock cycle, also known as 32flops
CPU power = number of cores x frequency of cores x 32flops
Power calculation formula: 1. P = w / T (average power) 2. P = FV; P=Fvcos α Instantaneous power)
because w = f (f force) × S (s displacement) (the definition of work), so the formula of power can also be derived P = f · V:
extended data:
power economy:
1. The unit of apparent power is KVA, which is used to express the capacity of transformer and UPS in China
The active power is 0.8 times of the apparent power, and the unit is kW The rated power of diesel generator set refers to the power that can run continuously for 12 hours The maximum power is 1.1 times of the rated power, but it can only be used for one hour within 12 hours The economic power is 0.75 times of the rated power, which is the output power of diesel generator set that can run for a long time without time limit. At this power, the fuel consumption is the lowest and the failure rate is the lowest1Mpa=1000000pa
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The calculation formula of compression spring force is as follows:
extended data
related situation of compression spring force
the essence of compression spring force is intermolecular force. The specific situation is as follows:
1. When the object is stretched or compressed, the distance between molecules will change, making the relative position between molecules open or close
In this way, the attraction and repulsion between molecules will not be balanced, and there is a tendency of attraction or repulsion The total effect of attraction or repulsion between these molecules is the macroscopic observed elasticity If the external force is too large and the distance between molecules is too much, the molecules will slide into another stable position Even if the external force is removed, it can not return to the recovery position, and permanent deformation will be retained