the design of everyday things review

Ngày tải lên: 26/05/2014, 07:46

Ngày tải lên: 11/08/2014, 05:21

Ngày tải lên: 11/08/2014, 16:20

... 119 pcf Example 4. Design the steel lying in the East-West direction of the mat shown below with external dimensions of 42 feet by 74 feet. The columns are all 15”by 15”, the LF = 1.6, f c ’ ... being designed for a small office building with a total live load of 250 kips and dead load of 500 kips. Find: (a) the depth D f for a fully compensated foundation, (b) the depth D f if a soft ... in the x and y values, which these values are found by using the x-y coordinate system off the mat foundation. Determine the average soil reaction. (92.34(78.8)69.8) 79 6 avg qpsf ++ ∆== Therefore,...

Ngày tải lên: 16/10/2012, 10:43

... accuracy of the workpiece mainly depend on the axial rigidity of the spindle headstock and of the rotary table. Therefore, the rigidity of the thrust bear- ings is especially important. To increase the ... on the roll- ing bearing aspects of the applications. The operation of the machine allows conclusions to be drawn about the operating conditions which dictate the bearing type and design, the ... conditions as the expansion of the rotating parts due to the effects of heat and centrifugal force do not cause jamming of the outer rings in the housing. Lubrication, sealing The bearings are...

Ngày tải lên: 25/12/2013, 05:17

... kN; the bearings are vertically arranged. Bearing selection The axial load of 130 kN is made up of the weight of the rotor and the two variable top and bottom fan im- pellers as well as the thrust ... clearance Due to the tight fits, the inner ring of the bearing is expanded and the outer ring with the roller-and-cage assembly is contracted. Thus the radial clearance of the bearing is reduced ... V1. Bearing selection The selection of the bearings is primarily based on the main thrust, which is directed downwards. It is made up of the weight of the rotor and and pump impeller (4 kN), the pump thrust...

Ngày tải lên: 25/12/2013, 05:17

... to the shoulder of the person who has fired it—corresponding to the momentum of the bul- let. Why, then, does the “kick” not knock a per- son’s shoulder off the way a bullet would? Because the ... Conservation Laws Then, as the ball hits the ground, the energy is dispersed. Most of it goes into the ground, and depending on the rigidity of the ball and the ground, this energy may cause the ball ... make the situation more plausible, the “Man of Steel” should have been shown catching the person, then slowly fol- lowing through on the trajectory of the fall toward earth. THE CRACK OF THE BAT: INCREASING...

Ngày tải lên: 19/01/2014, 13:04

... Typically, the designer designs a product with minimal knowledge about the capabilities and limitations of the manufacturing technology. The designer then tries to find out if the design can be ... beforehand, then the best configuration of the spindles for the parallel machine tool can be deduced. The best configuration of the spindles could be based on the types and number of features present on the ... that the designer can easily interact with the system. Ranking of Redesign Alternatives Another area requiring research attention in the context of generation of redesign solutions (design advisor)...

Ngày tải lên: 19/01/2014, 18:20

... know the prices of chemicals in the various markets and the operating costs of processes, the problem is then to decide the operating level of each process and amount of each chemical in the list ... assumed that the production rate (r ijt ) of the main product j of each such scheme is proportional to the capacity of the plant. where M i denotes the index set of main products of the alternative ... limited. The case of shut down of an existing plant results when the variable W it takes a value of zero after a given time period t. The economics of shut down can be modeled by the inclusion of the...

Ngày tải lên: 19/01/2014, 18:20

... selection The axial load of 130 kN is made up of the weight of the rotor and the two variable top and bottom fan im- pellers as well as the thrust of these fan impellers. They are supported by the ... adjustment is, therefore, not required. Machining of the housing bore is simplified in that the nominal outside diameters of the radial and thrust bearings are the same. The O.D. tolerance of the angu- lar ... V1. Bearing selection The selection of the bearings is primarily based on the main thrust, which is directed downwards. It is made up of the weight of the rotor and and pump impeller (4 kN), the pump thrust...

Ngày tải lên: 23/01/2014, 04:20

... reason the brief texts concentrate on the roll- ing bearing aspects of the applications. The operation of the machine allows conclusions to be drawn about the operating conditions which dictate the ... roughening of the surfaces (increased running noise). Bearing dimensioning The size of the bearings is dictated by the shaft diame- ter, which in turn is based on the anticipated vibra- tions. The bearing ... grinding the bearing inner rings and the roll body to finished size in one setting at a roll surface tempera- ture of 220 °C .The inner rings and the roll body can be ground together due to the fact...

Ngày tải lên: 23/01/2014, 04:20

... individuals. The lack of a unified “theory of ecology” and the existence instead of a fragmented body of “ecological theory”is evidenced by the relative use of these two terms in the scientific ... alternative to the “theory of evolution”for explaining the diversity of life on Earth and the ex- istence of millions of different species. Opponents of this view hold that ID is not a scientific theory ... understanding of the t erm “scientific theory,”it is anachro- nistic to use the phrase “theory of evo- lution.”What constitutes a self-contained scientific theory is a subject of much philosophical...

Ngày tải lên: 25/01/2014, 08:20

... beforehand, then the best configuration of the spindles for the parallel machine tool can be deduced. The best configuration of the spindles could be based on the types and number of features present on the ... Typically, the designer designs a product with minimal knowledge about the capabilities and limitations of the manufacturing technology. The designer then tries to find out if the design can be ... ways of simplifying CSG models for their potential use in feature recognition. ã Restrict the domain of the model by restricting the range of primitives and/or of the orientations that they may...

Ngày tải lên: 25/01/2014, 13:20

... know the prices of chemicals in the various markets and the operating costs of processes, the problem is then to decide the operating level of each process and amount of each chemical in the list ... dispersion of the solution vectors, the approach to restrict the dispersion of the random recourse costs can also be considered. Because the variability of the recourse costs is a measure of its ... ,…, are the extreme rays of C, then the projection of P onto the space of x is given by: proj x (P) ϭ {x : Ax Յ b, h ϭ 1,…,H; x ʦ X}. This expression requires finding the extreme rays of the polyhedral...

Ngày tải lên: 25/01/2014, 13:20

... between the tooth. Thus w r stR st st = θ (15.2-31) The width of slot between the base of the tips is taken as the average of the distance of the chord length of the inner corners of the tooth ... l eo is the end winding offset, which is the amount of overhang of the end winding between the end of the stator stack and the end winding bundle. The end winding offset is a function of the manufacturing ... addition to the computing the dependent geometrical variables, there are several other quantities of interest that will prove useful in the design of the machine. The first of these is the area of a...

Ngày tải lên: 16/02/2014, 18:55

... Construction of arches 512 12 The nature of design His choice will be informed by other aspects of the project, for instance: the number of similar columns in the project; the range of heights of such ... is one of only two major bridges designed by Lutyens. 1 The nature of design 1.1 Design and analysis The origin of the word design is the Latin ‘designare’, to draw. In classical times, the stability ... concerned with the strength of materials and the theory of structures; the specifi ed design life of the bridge and the maintenance regime; the various regulations that must be complied with; the economic...

Ngày tải lên: 18/02/2014, 18:20

Ngày tải lên: 19/02/2014, 14:20

... alreadyforwarders for topic . The subscription of node causes the other two nodes along the route to become forwarders for the topic, and causes them to add the preceding node in the route to their children ... PUBLISH; the roles of these messages are described in the next sections. The following variables are used in the pseudocode: topics is the set of topics that the local node is aware of, msg.source ... locate the rendez-vous point of a topic. If the publisher is aware of the rendez-vous point’s IP address then the PUBLISH message can be sent straight to the node. If the publisher does not know the...

Ngày tải lên: 19/02/2014, 18:20

Ngày tải lên: 08/03/2014, 18:20

Ngày tải lên: 10/03/2014, 08:20