Có 20+ tài liệu thuộc chủ đề "kỹ thuật thiết kế"
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No co the xufft ban ve ra gifiy qua lTI"l.y ve (Piotter) hay may in (Printer) bang d.e C[1lI l~nh dan gUm. Chu y: Khi b<).n dii t!).o Batch file dlchl,lY ACAD. tlre la AutoCAD dang san sang ti€p nh~n It;nh ella b<;lll dua ra. Hel p Item (nwc can trq glup): h<.lIl c6 the g5 ten l¢nh vao.. H'inh...
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Xác định chiều dμi tổng quát của bộ nhíp.. Vậy độ cứng của bộ nhíp lμ Kg cm f. Xác định tiết diện của các lá nhíp.. Xác định chiều dμi từng lá nhíp. Vì bộ nhíp có 2 lá nhíp trên cùng bằng nhau l 1 =l nên 2. Xác định chiều dμi lá nhíp thứ 3 (L 3....
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7.1 THE DESIGNER AND THE DESIGNER'S PROBLEMS. 1.1.1 Design and the Designer. Design and engineering, although sometimes viewed as distinct, are two facets of the same profession. The design imperative is the result of a problem definition and has the following general form Design (subject to certain problem-solving constraints) a component, system or process that will perform a specified task...
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threshold value of the third variable can be estimated to provide a specified reliabil- ity. Much of the output is in the form of drawings that convey instructions for the manufacturing of components, the assembly of components into machines, machine installations, and maintenance. Additional information is provided by parts lists and written specifications for assembly and testing of the product.....
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a Standard deviation. <(>. It is paradoxical that one of the great contributions to physical science, namely the search for consistency and reproducibility in nature, grew out of an idea that was only partially valid. As another example, the variability in tensile strength in bolts is shown in the histogram of the ultimate tensile strength of 539 bolts in Fig....
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3.6 DESIGN OF THE MEASURING SYSTEM / 3.8. this regard one must understand what a measurement is and how to properly select and/or design the component transducers of the measurement system. One must also understand the dynamic response characteristics of the components of the resulting measurement system in order to properly interpret the readout of the measuring sys- tem. A...
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The voltage sensitivity depends on the fundamental charge sensitivity of the piezoelectric crystal:. K is a constant which depends on the geometry and the units of the parameters in the preceding equation.. where C T = total capacitance of the combination of piezoelectric crystal, lead wires, and readout device and is equal to. The equivalent circuits of the piezoelectric crystal...
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The degree of precision obtained for the dependent variable depends on the accuracy of the predominant term in the particular equation, as related to algebraic operations. In what follows, we will assume that the accuracy of the computational device is better than the num- ber of significant figures in a determined value.. The independent com- ponents are separated by introduction...
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N a Number of active turns N t Total number of turns. Documentation of the design. Computer-aided analysis (CAA) involves use of the computer in an "if this then that". The data base created during computer-aided drafting can be used by computer-aided manu- facturing. The basis for this programming must be their understanding of the problem. This capability can be...
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The method begins with an examination of worn parts of the type to be improved. The next step is an estimate of stresses, temperatures, and likely conditions of operation of the redesigned machinery. 6.1.1 Types, Appearances, and Mechanisms of Wear. Wear is a loss or redistribution of surface material from its intended location by def- inition of the ASTM. The...
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The section on mechanical properties and tests discusses all the hardness tests and includes a detailed explanation of the tensile test and tensile properties. A study of the mechanical properties of materials must begin with an understanding of the structure of solid materials. The definitions of the mechanical properties given in the following sections are on the basis of the...
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Several precautions must be observed in the proper use of the Rockwell scales.. Readings taken on the sides of cylinders or spheres should be corrected for the curvature of the surface. The hardness numbers for all the Rockwell scales are an inverse measure of the depth of the indentation. Each division on the dial gauge of the Rockwell machine corresponds...
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8.2 STRENGTH OF PLASTICALLY DEFORMED MATERIALS / 8.3 8.3 ESTIMATING ULTIMATE STRENGTH AFTER PLASTIC STRAINS / 8.4 8.4 ESTIMATING YIELD STRENGTH AFTER PLASTIC STRAINS / 8.8 8.5 ESTIMATING ULTIMATE STRENGTH OF HEAT-TREATED. 8.6 ESTIMATING ULTIMATE STRENGTH OF HEAT-TREATED LOW-ALLOY STEELS / 8.11. S u Engineering ultimate strength in tension S y Engineering yield strength, 0.2 percent offset t Time. The...
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A pair of pli- ers is useless unless it is held in the human hand. early in the twentieth century. its desired outcome is the optimization of work, especially of the interface between the human and the technical product.. In the United States, the Human Factors and Ergonomics Society is the professional organization. (Addresses are given in the References section.)....
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10.1 WHY SAFETY. 10.1 10.2 WHAT IS SAFETY. 10.3 HAZARD, RISK, AND DANGER DESIGNER'S OBLIGATION / 10.4. 10.5 HUMAN FACTORS/ERGONOMICS SUMMARY/10.22. REFERENCES / 10.22. RECOMMENDED READING / 10.24. Tacitus [10.1], about the first century A.D., said: "The desire for safety lies over and against every great and noble enterprise.". Even some 2000 years earlier, the first known written law code...
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11.1 INTRODUCTION/11.2. 11.2 REDUCING THE NUMBER OF EXPERIMENTS SIMILITUDE/11.7. 11.4 OPTIMALITY/11.9 11.5 QUADRATURE CHECKING/11.15 REFERENCES/11.21. TV Number of experiments to establish a robust functional relationship among n parameters, number of function evaluations. N' Number of experiments to establish a robust functional relationship among dimensionless parameters. N a Number of active turns in a spring N n Number of pi terms...
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12.1 PERMISSIBLE STRESSES AND STRAINS THEORY OF STATIC FAILURE / 12.3. 12.3 STRESS CONCENTRATION FRACTURE MECHANICS NONFERROUS METALS / 12.17. 12.6 STOCHASTIC CONSIDERATIONS / 12.20 REFERENCES / 12.20. The discovery of the relationship between stress and strain during elastic and plastic deformation allows interpretation either as a stress problem or as a strain problem.. Codes, standards, and state of the...
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RECOMMENDED READING / 13.45. 13.1.1 Sparse Survey. 13.1.2 Constant-Stress-Level Testing. 13.1.3 Probit Method. 13.1.4 Coaxing. 13.1.5 Prot Method 1. 13.1.6 Up-Down Method 1. (From Ransom [13.5], with permission.). [13.4] and [13.5].. (13.5) gives or . 13.2 SNDIAGRAMFORSINUSOIDAL AND RANDOM LOADING. Figure 13.2 is a common example. 13.3 FATIGUE-STRENGTH MODIFICATION FACTORS. Figures and 13.6 are. Figure 13.6 represents axial fatigue. 13.3.1...
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14.3 ARC SHIELDING NATURE OF THE ARC / 14.4. Since the joining is by inter- mixture of the substance of one part with the substance of the other part, with or without an intermediate of like substance, the final weldment has the potential for exhibiting at the joint the same strength properties as the metal of the parts. This is...
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14.7.1 Electrodes, Rods, and Fluxes. 14.13«. TABLE 14.1 AWS A5.1-69 and A5.5-69 Designations for Manual Electrodes. listed in Tables 14.3 and 14.4. 14.135.. 14.135. TABLE 14.2 AWS A5.1-69 Electrode Designations for Covered Arc-Welding Electrodes Designation Current Covering type. FIGURE 14.13 (a) National Electrical Manufacturers Association color-code method to identify an electrode's classification, (b) American Welding Society imprint method. TABLE 14.3...