Standard handbook of machine design

... that you design 41.7.2 Three Positions of a Plane When three positions of a plane are specified by the location of line CD, as shown in Fig 41.9, it is possible to construct the center of a circle ... number of links (fixed link included) j = number of joints ft = /of /th joint K = integer = for plane, spherical, or particular spatial linkages = for most spatial linkages Since...

Ngày tải lên: 17/10/2013, 12:15

... intelligently followed the cycle-profile procedure, a complete graphic portrayal of what should happen at any point in the cycle of operation of the machine is the result The designer should be able to ... of the many types of flow control valves in combination with one of the basic methods of flow control described previously Another approach takes advantage of the throttli...

Ngày tải lên: 19/10/2013, 20:15

... analysis in designing open-loop circuits and dynamic load analysis in designing closed-loop systems The cycle profile1 is the recommended technique for displaying the results of machine- cycle-load ... first step is to analyze the machine cycle This analysis turns out to be a timeand-motion study of the operation of the machine If an actual study is not available to the designer, s...

Ngày tải lên: 19/10/2013, 20:15

... Much of the design work done is in a small part of one of the feedback or feedforward portions of the chart and thus is evolutionary Rarely will an individual designer start at the beginning of ... characteristic of the pro- TABLE 1.11 Elements of a Decision-Making Model Alternative courses of action States of nature: The environment of operation of the decision model...

Ngày tải lên: 19/10/2013, 20:15

... incorporated in the design of machinery either by treating the sources of machine noise or by altering the structureborne and/or airborne paths of this noise This section contains a discussion of these ... fields in the vicinity of a noise source frequency of the sound, the dimensions of the source, and the phase relations of the various radiating parts of the source As...

Ngày tải lên: 23/10/2013, 18:15

... shallow tacked at rate of 10 mpy; commerdepths of Pacific off Panama Canal cial grade often corrodes at 100 Single phase brasses, silicon and times this rate, largely because of phosphor bronzes ... attack rate of the more active metal and decreases that of the less active metal An adverse area ratio is characterized by having a larger surface area of less active metal than that...

Ngày tải lên: 23/10/2013, 18:15

... Validity of mathematical models used to represent reality Intensity of stress concentrations Influence of time on strength and geometry Effect of corrosion • Effect of wear • Length of any list of ... magnitude, but in the pattern of variation Evidence gathered by measurement in pursuit of uniqueness of magnitude was really a mix of systematic and random effects It is th...

Ngày tải lên: 23/10/2013, 18:15

... affecting machines and their designers is most often filed under negligence or strict liability theories, both of which may allege the presence of a defect Thus a major concern of designers would ... representations of performance and operation (implied warranty); conduct of designers, manufacturers, sellers, and users (negligence); and the characteristics of the product exclusive...

Ngày tải lên: 23/10/2013, 18:15

... are they designed as universal tools Industrial robots are designed with specific types of application in mind, and this fact very strongly influences the design of both hardware and software ... the design of mountings of the drive components and of the support bearings of the input and output shafts to ensure good service life Cycloidal drives, now on the market in several t...

Ngày tải lên: 28/10/2013, 01:15

... nF = speed of first gear in train nL = speed of last gear in train HA = speed of arm The following example will illustrate the use of Eq (46.15) Example Refer to the planetary train of Fig 46.4 ... r/min of the left wheel is zero, the pitch point of gears and has a linear velocity twice that of the pin which supports the planet Therefore, the r/min of the right wheel is twic...

Ngày tải lên: 28/10/2013, 01:15

... an indication of the development of systematic errors in the measuring system Measurement of the variable with two different measuring systems can often help detect the presence of a fixed error ... removal of the noise source, elimination of the noise by cancellation, minimization of the noise by division (filtering), and minimization of the noise by frequency-selective filte...

Ngày tải lên: 28/10/2013, 01:15

... intensity of one six-hundred-thousandth of a square meter of a radiating cavity at the temperature of freezing platinum (2042 K) under a pressure of 101 325 N/m2 The mole is the amount of substance of ... 3.6 DESIGNOFTHEMEASURINGSYSTEM The design of a measuring system consists of selection or specification of the transducers necessary to accomplish the detection, transm...

Ngày tải lên: 28/10/2013, 01:15

... radius of bar / = second moment of area (polar) The total angle of twist of such a bar, in radians, is 9=f (49.16) where / = length of the bar For the shear stress and angle of twist of other ... and of a homogeneous material The line of action of the force is through the centroid of the section There is no discontinuity or change in cross section near the stress element...

Ngày tải lên: 06/11/2013, 12:15

... the centroids of a group of lines or a group of areas Area groups are often composed of a combination of circles, rectangles, triangles, and other shapes The areas and locations of the centroidal ... moment of inertia, which is I p2 dm (48.4) where p = distance to some axis and dm = an element of mass Because of the resemblance, Eqs (48.3) are often called the equations for...

Ngày tải lên: 06/11/2013, 12:15

... availability of a family of microprocessors with compatible characteristics and of shared bus hardware becomes important Another class of supporting hardware and software aids in the development of programs ... cost is the introduction of a problem of communication between computers Actually this is only part of a larger problem of transmission of data between different pa...

Ngày tải lên: 06/11/2013, 12:15