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Time reversal technology[3]: Windowing and capturing, using space-time focusing properties of time reversal, effectively inhibiting and rational using multi-path effects, which has an accurate measurement of the signal between the nodes of the arrival time and distance.
Suppose the distance weight value of i-th beacon node to the unknown node is , using the least squares method [6] to solve the weighted linear equation: (4) , x, y coordinate value is what we want to get. 3.2 Weighted multilateral positioning algorithm error analysis Factors affecting ranging accuracy on the entire process of locating are ranging error, beacon node position error and residual.
Ranging error, the reference node position errors and residuals are independent random error, we can use a synthetic theory of random errors comprehensive analysis of the various factors that impact the positioning accuracy error.
But in the case of non-line of sight transmission, Its ranging error increase because the path of electromagnetic waves is no longer a straight line; in terms of multilateral position algorithm the weighted multilateral position algorithm using different weighting factors to reduce positioning errors, it increase the positioning accuracy and has the characteristics of stable, high-reliability.
Error Theory and Data Processing, Mechanical Industry Press.pp.114 -121, 2004

This paper proposes a bridge health monitoring system based on wireless sensor network, which collects information of each mechanical part of the bridge.
This paper proposes a bridge health monitoring system based on wireless sensor network, which is thought to be one of the important technologies affecting human life in the future.
When a bridge happens mechanical deformation under external force, its resistance value produces corresponding change, this physical phenomenon is known as resistance strain effect of resistance wire.
It is a sensor that can convert specimens' mechanical strain change to its resistance change, that is to say the resistance strain gauge is a force-electricity convert component.
Others factors like high data throughput rate, processing power, as well as the requirement of a number of general I / O control ports must be taken into accounts when choosing the processor.

Surface integrity in the engineering sense can be defined as a set of various properties (both, superficial and in-depth) of an engineering surface that affect the performance of this surface in service.
These properties include surface finish, texture, and profile, fatigue corrosion and wear resistance, and adhesion and diffusion properties among others [15].
Different workpiece material with different properties and microstructure gives different effect during machining, including drilling.
These properties were responsible for the rapid wear on the cutting tool hence resulting in short tool life and rapid tool failure [16].
Viscosity affects the flow of cutting fluid.

The quality factor of the 4-9-9-14 piezoelectric actuator would affect the efficiency of the system, so the quality factorshould be known for knowing the situation of the system efficiency.
The quality factor Q is 24.97.
The appearance could be found in table, the quality factors of piezoelectric materials are not very well.
The quality factor Q is not good enough.
When L1orC2is changed, the output current is affected seriously.

Eight or more teeth and holes at the open end and at the bottom, respectively, are employed for mechanical balance purpose to adjust the frequency split between the drive and sense modes.
Fig. 2 FEM model of the Resonator The material of the resonator is a kind of nickel alloy, whose major properties are listed in Table 1.
And the material is assumed to possess isotropic and homogeneous properties.
The material properties Name Density (kg/m3) Elastic modulus (GPa) Poisson’s ratio Nickel alloy 8,250 220 0.3 2.2 modal analysis of the resonator The modal analysis results are shown in Fig. 3.
The main conclusions from the present work are drawn as follow: The base of the resonator affect the modal frequency of the resonator.

The accuracy of the model will directly affect the credibility of the simulation results.
Many factors affected the longitudinal adhesion characteristics, which mainly included the road materials, the state of the road surface and the tire structure, materials, tread pattern, recency, tire pressure, tire force and the state of motion of the tire relative to the road surface[1].
Dynamic Road Adhesion Coefficient Measurement Principle The braking process of the vehicle on the road surface is a multi-factor, non-linear dynamic process.
Dynamic road adhesion coefficient is related to many factors, such as the condition of the road surface, tire parameters and surface conditions, tire slip rate.
Road surface conditions included pavement material properties, pavement smoothness and corrupt state.

Equipment conditions showed by health index value in different interval are as follows[3]: 0~3.5 indicates a good condition, in which condition the equipment property is stable and the probability of stoppage occurrence is at a relatively low level.
It should be updated with factors of average trip times in a year and environment.
Correction factor of fault history fH, which is decided by fault times divided into 6 grades, according to accident investigation procedures of South Grid.
Preventive trial correction coefficient fP, which is decided by five test items of mechanical properties, loop resistance, dielectric loss, capacitance and gas test.
The correction factor of circuit breaker health index fM is obtained by comprehensive analyzing the entire above correction coefficient.

The linear theory of elasticity has two main parameters: stress intensity factor K and Elastic energy release rate G.
At present, to the crack tip opening displacement (CTOD) as the property parameter of the crack initiation and a few amounts of stable propagation, a lot of research work has been done in the theory and practice.
It is the inherent property of the material.
For the heat affected zone specimens, the notch is on the intersection of the wall thickness centre line and fusion line.
[9] Huilin Gao, in :pipeline-welding behavior of microstructure and properties , Shaanxi science and technology press ,Xi’an (1995)

Due to the possibility to obtain high values of specific mechanical and deformational properties in cellular or thin-walled structures, this kind of materials are perspective to use in different areas: medicine, transport, machinery, aviation industries etc.
As a consequence, mechanical properties are changed.
In that case in the future we can more thoroughly adjust absorbing properties not only by changing construction but by changing microstructure of the wall material.
Zadpoor, Mechanical properties of additively manufactured octagonal honeycombs, Materials Science and Engineering C.
Petrov, Anisotropy of mechanical properties and its correlation with the structure of the stainless steel 316L produced by the SLM method, Physics Procedia.

Table 1. 40 TRIZ innovative principles 1 segmentation 15 dynamic parts 29 pneumatics & hydraulics 2 separation 16 partial or excessive actions 30 flexible shells & thin films 3 local quality 17 dimensionality change 31 porous materials 4 symmetry change 18 mechanical vibration 32 optical property changes 5 merge 19 periodic action 33 homogeneity 6 multi-functionality 20 continuity of useful action 34 discarding & recovering 7 nested doll 21 hurrying 35 parameter change 8 weight compensation 22 blessing in disguise 36 phase transition 9 preliminary counteraction 23 feedback 37 thermal expansion 10 preliminary action 24 intermediary 38 strong oxidants 11 beforehand compensation 25 self-service 39 inert atmosphere 12 equi-potentiality 26 copying 40 composite materials 13 the other way around 27 cheap disposables 14 curvature increase 28 mechanical interactionsubstitution Table 2. 39 TRIZ engineering features 1 Weight of moving objects 14 Strength 27 Reliability 2 Weight of stationary
objects 15 Duration of action by a moving object 28 Measurement accuracy 3 length of moving objects 16 Duration of action by a stationary object 29 Manufacturing precision 4 length of stationary objects 17 temperature 30 External harm affects the object 5 area of moving objects 18 Illumination intensity 31 Object-generated harmful factors 6 area of stationary objects 19 Use of energy by moving object 32 Ease of manufacture 7 volume of moving objects 20 Use of energy by stationary object 33 Ease of operation 8 volume of stationary objects 21 Power 34 Ease of repair 9 Speed 22 Loss of energy 35 Adaptability or versatility 10 Force 23 Loss of substance 36 Device complexity 11 Stress or pressure 24 Loss of information 37 Difficulty of detecting and measuring 12 shape 25 Loss of time 38 Extent of automation 13 Stability of object’s composition 26 Quantity of substance/ matter 39 productivity Table. 3 Partial triz 39×39 contradiction matrix [1] TRIZ-based conflict-solving approaches at planning
However, the management parameter 27 “The robustness and non-sensitivity of the decisions a manager makes; affected by controllable factors from employees, departments, or a enterprise” is worsen simultaneously.
The robustness and non-sensitivity of the decisions a manager makes; affected by controllable factors from employees, departments, or a enterprise 35.