bearing中文

Imagine being tasked with designing a 50-foot heat treatment conveyor furnace to process material 16+ hours a day. This type of furnace can reach upwards of 2000°F and can easily have over a hundred rotating shafts, each of which requires regular maintenance.

A bearing can be taken to a fixed or moving object in order to target it with gunfire or missiles. This is mainly used by ground troops when planning on using an air-strike on the target.

Maze meaning

The carbon graphite cartridge consists of the carbon graphite bearing itself and a stainless steel spherical ring into which the carbon is press fit. This ring allows for the bearing to be self-aligning, which is crucial both during the shaft installation process and throughout the life of the bearing. The replacement of these cartridges is often as simple as removing a set screw which holds the spherical ring in place and twisting the cartridge to a position where it can slide out of the assembly. This means that you don’t have to replace the entire housing every time the bearing shows too much wear.

In nautical navigation the absolute bearing is the clockwise angle between north and an object observed from the vessel.

A grid bearing (also known as grid azimuth) is measured in relation to the fixed horizontal reference plane of grid north, that is, using the direction northwards along the grid lines of the map projection as a reference point.

Bearingdefine

As is the case with any type of bearing, carbon graphite bearings will wear over time and will need to be replaced at some point. Luckily, most carbon graphite bearing assemblies are designed with a strong emphasis on ease of maintenance. Typically, only the carbon graphite cartridge needs to be replaced, not the full assembly.

Alternatively, the US Army defines the bearing from point A to point B as the smallest angle between the ray AB and either north or south, whichever is closest. The bearing is expressed in terms of 2 characters and 1 number: first, the character is either N or S; next is the angle numerical value; third, the character representing the perpendicular direction, either E or W. The bearing angle value will always be less than 90 degrees.[1] For example, if Point B is located exactly southeast of Point A, the bearing from Point A to Point B is "S 45° E".[3] For example, if the bearing between Point A and Point B is S 45° E, the azimuth between Point A and Point B is 135°.[1][3]

The decision to use a pillow block or a flange block is often based largely on ease of installation – whichever type is easiest to mount in your application is likely the right choice.

A compass bearing, as in vehicle or marine navigation, is measured in relation to the magnetic compass of the navigator's vehicle or vessel (if aboard ship). It should be very close to the magnetic bearing. The difference between a magnetic bearing and a compass bearing is the deviation caused to the compass by ferrous metals and local magnetic fields generated by any variety of vehicle or shipboard sources (steel vehicle bodies/frames or vessel hulls, ignition systems, etc.)[4]

Moving from A to B along a great circle can be considered as always going in the same direction (the direction of B), such as when holding fixed a steering wheel or ship's wheel. However, following a great circle does not keep the same bearing, which applies when following a rhumb line. Accordingly, the direction at A of B, expressed as a bearing, is not in general the opposite of the direction at B of A (when traveling on the great circle formed by A and B); see inverse geodetic problem. For example, assume A and B in the northern hemisphere have the same latitude, and at A the direction to B is east-northeast. Then going from A to B, one arrives at B with the direction east-southeast, and conversely, the direction at B of A is west-northwest.

Metcar’s engineering team is always happy to help you select the correct bearing assembly for your application. We know how important proper bearing selection is for the success of your design and are always excited to offer our years of experience to support your project.

The measurement of relative bearings of fixed landmarks and other navigational aids is useful for the navigator because this information can be used on the nautical chart together with simple geometrical techniques to aid in determining the vessel's position, speed, course, etc.

bearing数学

In nautical navigation the relative bearing of an object is the clockwise angle from the heading of the vessel to a straight line drawn from the observation station on the vessel to the object.

Bearing assemblies often fall into two categories – flange blocks and pillow blocks. The difference between these two types of bearings is in the orientation of their bolt holes relative to the shaft axis. A flange block’s bolt holes are in line with the shaft axis while a pillow block’s bolt holes are perpendicular to this axis.

Get my bearings definition

In navigation, bearing or azimuth is the horizontal angle between the direction of an object and north or another object. The angle value can be specified in various angular units, such as degrees, mils, or grad. More specifically:

Compassbearing

It is essential that questions like these are taken into account and the proper material grade is selected for each application individually, as the carbon graphite grade selection is application-dependent and has a major impact on bearing performance.

Maintaining this massive piece of equipment is a major challenge in and of itself. Constantly applying lubrication to the bearings that support the rotating shafts is cumbersome, and frequent replacement of these bearings is extremely taxing on any maintenance crew. Instead, conveyor furnace manufacturers often turn to self-lubricated high performance carbon graphite bearing assemblies as an all-encompassing solution.

If the north used as reference is the true geographical north then the bearing is a true bearing whereas if the reference used is magnetic north then the bearing is a magnetic bearing. An absolute bearing is measured with a bearing compass.

One of the final considerations when selecting the proper bearing assembly is the bore size. It is important that a sufficient running clearance is designed so that the shaft does not seize in the bearing.

Image

Pillow block and flange block bearing assemblies are widely used in industrial applications across multiple industries, ranging from hot air dampers to the aforementioned heat treatment furnaces. Typically, these assemblies come in many different sizes and styles. When choosing a pre-engineered bearing assembly, there are a number of considerations to take into account.

Image

Stainless steel housings can be used in applications which don’t require the same degree of strength. One noteworthy benefit of using stainless steel is that these bearing assemblies can be used in applications where sanitary conditions are key, such as in conveyor ovens for food production.

Bearing

The measurement of relative bearings of other vessels and objects in movement is useful to the navigator in avoiding the danger of collision. For example:

Image

Bearingdefinition engineering

The measurement of absolute bearings of fixed landmarks and other navigation aids is useful for the navigator because this information can be used on the nautical chart together with simple geometrical techniques to aid in determining the position of the vessel.

To "keep to a bearing" is not, in general, the same as going in a fixed direction along a great circle. Conversely, one can keep to a great circle and the bearing may change. Thus the bearing of a straight path crossing the North Pole changes abruptly at the Pole from North to South. When travelling East or West, it is only on the Equator that one can keep East or West and be going straight (without the need to adjust). Anywhere else, maintaining latitude requires a change in direction, requires adjustment. This change in direction becomes increasingly negligible as one moves to a lower latitude.

Once the general bearing assembly type is identified, the housing material must be chosen. For heavy duty applications, cast iron housings have proven to provide the strength and durability needed to support heavy loads.

There can be hundreds of bearings supporting shafts rotating nearly 24/7 in many conveyor oven applications. This demanding duty cycle coupled with the extreme heat often involved in these applications means that pre-emptive maintenance is absolutely necessary.

The relative bearing is measured with a pelorus or other optical and electronic aids to navigation such as a periscope, sonar system, and radar systems. Since World War II, relative bearings of such diverse point sources have been and are calibrated carefully to one another. The United States Navy operates a special range off Puerto Rico and another on the west coast to perform such systems integration. Relative bearings then serve as the baseline data for converting relative directional data into true bearings (N-S-E-W, relative to the Earth's true geography). By contrast, Compass bearings have a varying error factor at differing locations about the globe, and are less reliable than the compensated or true bearings.